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Drinking water in Overath

12 supply zones — values can differ depending on the district. Below is the zone with the most documented parameters, the others collapsed underneath. To determine the exact match, look up the postcode.

How to read the share of the parametric value

12 % Share of the parametric value. The proportion of the permitted maximum that the measured value uses — here 12 %, so just over an eighth.
< 10 % * Below the limit of quantification. The substance was not detectable. The mark shows where the detection limit lies relative to the parametric value — the actual share of the parametric value is below that.

Several samples per year: for chemical parameters the mean value is given, for microbiological ones the highest measured value. There the parametric value is zero — a single finding would disappear in the average, and it is precisely that finding which is the information. Which reference applies is stated in the last column of the table.

bonn gesamt

SWB Energie und Wasser (Stadtwerke Bonn); Wasserlieferant: Wahnbachtalsperrenverband (WTV)
Key values bonn gesamt
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 19 mg/l 50 mg/l
38 %
Maximum · Source [1]
Sodium 17,8 mg/l 200 mg/l
9 %
Maximum · Source [1]
Show all recorded parameters (7 — most recent value per parameter)

Chemical parameters (2)

Chemical parameters – bonn gesamt
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 19 mg/l 50 mg/l
38 %
Maximum · Source [1]
Uranium < 0,0001 mg/l
below limit of quantification
 10 µg/l
< 1 % *
Single value · Source [1]

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Indicator parameters (2)

Indicator parameters – bonn gesamt
Parameter Value Parametric value Share of the parametric value Reference
Chloride 30 mg/l 250 mg/l
12 %
Maximum · Source [1]
Sodium 17,8 mg/l 200 mg/l
9 %
Maximum · Source [1]

Further parameters (3)

Further parameters – bonn gesamt
Parameter Value Parametric value Share of the parametric value Reference
Calcium 37,9 mg/l — — Maximum · Source [1]
Magnesium 7,5 mg/l — — Maximum · Source [1]
Total hardness 4,4 – 7,0 °dH — — Mean · Source [2]

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Sources: [1] bonn-37fac000.html · 2025 · retrieved on 25/07/2026 [2] https://www.stadtwerke-bonn.de/fuer-zuhause/produkte/wasser/wasseranalyse/ · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 51491

Show 11 more supply zones

bergneustadt gesamt

Aggerverband

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness
4.4 °dH
Hardness range soft
Key values bergneustadt gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (3)

Microbiology – bergneustadt gesamt
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Intestinal enterococci 0 KBE/100 ml 0/100 ml — Mean
Somatic coliphages <2 PFU/100 ml
below limit of quantification
 50/100 ml
UBA guide value
 — Mean

For trifluoroacetic acid (TFA), the German Drinking Water Ordinance does not specify a parametric value. The comparison is therefore made with the guide value of 60 µg/l issued by the Umweltbundesamt, which has replaced the earlier health-related guidance value of 3 µg/l. A guide value is not a legal maximum but a health-related classification.

Chemical parameters (25)

Chemical parameters – bergneustadt gesamt
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Antimony <0,0001 mg/l
below limit of quantification
 5 µg/l
< 2 % *
Mean
Arsenic <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Benzene <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Benzo(a)pyrene <0,00001 mg/l
below limit of quantification
 10 ng/l
< 100 % *
Mean
Bisphenol A <0,00003 mg/l
below limit of quantification
 2.5 µg/l
< 1 % *
Mean
Boron 0,008 mg/l 1 mg/l
0.8 %
Mean
Bromate <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Cadmium <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Chromium <0,0005 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Mean
Copper <0,005 mg/l
below limit of quantification
 2 mg/l
< 0.3 % *
Mean
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Fluoride <0,05 mg/l
below limit of quantification
 1.5 mg/l
< 3 % *
Mean
Haloacetic acids (HAA) <0,0060 mg/l
below limit of quantification
 — — Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Microcystin-LR <0,00005 mg/l
below limit of quantification
 — — Mean
Nickel <0,001 mg/l
below limit of quantification
 20 µg/l
< 5 % *
Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Mean
Polycyclic aromatic hydrocarbons 0 mg/l 0.1 µg/l
0 %
Mean
Selenium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Trihalomethanes — Total 0,005 mg/l 50 µg/l
10 %
Mean
Uranium <0,0001 mg/l
below limit of quantification
 10 µg/l
< 1 % *
Mean
Vinyl chloride <0,0001 mg/l
below limit of quantification
 0.5 µg/l
< 20 % *
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

PFAS (1)

PFAS – bergneustadt gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean

Indicator parameters (21)

Indicator parameters – bergneustadt gesamt
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Ammonium <0,13 mg/l
below limit of quantification
 0.5 mg/l
< 26 % *
Mean
Calcite dissolution capacity 0,37 mg/l 5 mg/l CaCO3 — Mean
Chloride 12,1 mg/l 250 mg/l
5 %
Mean
Clostridium perfringens (including spores) 0 Anzahl/100 ml 0/100 ml — Mean
Coliform bacteria 0 Anzahl/100 ml 0/100 ml — Mean
Colony count 22 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colony count 36 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colour <0,1 m-1
below limit of quantification
 0.5 m⁻¹ — Mean
Conductivity (25 °C) 196 µS/cm 2,790 µS/cm — Mean
Iron 0,015 mg/l 0.2 mg/l
8 %
Mean
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Odour ohne Befund für den Verbraucher annehmbar — Mean
Oxidisability <0,5 mg/l
below limit of quantification
 5 mg/l O2 — Mean
pH 8,2 pH-Einheiten 6,5–9,5 — Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Taste ohne Befund für den Verbraucher annehmbar — Mean
Temperature 13,4 °C — — Maximum
Total organic carbon (TOC) 1,1 mg/l ohne anormale Veränderung — Mean
Turbidity 0,05 NTU 1 NTU — Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Radiology (1)

Radiology – bergneustadt gesamt
Parameter Value Parametric value Share of the parametric value Reference
Radon-222 <10 Bq/l
below limit of quantification
 100 Bq/l — Single value

Further parameters (10)

Further parameters – bergneustadt gesamt
Parameter Value Parametric value Share of the parametric value Reference
Calcium 26,9 mg/l — — Mean
Carbonate hardness 3,5 °dH — — Mean
Copper quotient 10,1 — — Mean
Lithium <0,10 mg/l
below limit of quantification
 — — Mean
Magnesium 2,7 mg/l — — Mean
Phosphate <0,03 mg/l
below limit of quantification
 — — Mean
Potassium <1,0 mg/l
below limit of quantification
 — — Mean
Silicate / silicic acid 3,1 mg/l — — Mean
Total hardness 0,78 mmol/l — — Mean
Zinc <0,005 mg/l
below limit of quantification
 — — Mean

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.aggerverband.de/trinkwasser/trinkwasseranalyse-qualitaetskontrolle?file=files/assets/trinkwasser/qualitaetskontrolle/JMW_2025.pdf · Jahresmittelwert 2025 · retrieved on 11/07/2026

Postcodes in this zone: 51491

engelskirchen gesamt

Aggerverband

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

These values are more than a year old. The most recent analysis the water supplier has published for this zone dates from 31/12/2023. We have no newer values — which is why we show the latest available ones rather than none at all. They say nothing about how the water has changed since then.

Water hardness
4.4 °dH
Hardness range soft
Key values engelskirchen gesamt
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 12,3 mg/l 50 mg/l
25 %
Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Sulphate 11,2 mg/l 250 mg/l
4 %
Mean
Sodium 5,7 mg/l 200 mg/l
3 %
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Show all recorded parameters (54 — most recent value per parameter)

Microbiology (2)

Microbiology – engelskirchen gesamt
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Intestinal enterococci 0 KBE/100 ml 0/100 ml — Mean

Chemical parameters (21)

Chemical parameters – engelskirchen gesamt
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Antimony <0,001 mg/l
below limit of quantification
 5 µg/l
< 20 % *
Mean
Arsenic <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Benzene <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Benzo(a)pyrene <0,00001 mg/l
below limit of quantification
 10 ng/l
< 100 % *
Mean
Boron 0,008 mg/l 1 mg/l
0.8 %
Mean
Bromate <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Cadmium <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Chromium <0,0005 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Mean
Copper <0,005 mg/l
below limit of quantification
 2 mg/l
< 0.3 % *
Mean
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Fluoride <0,05 mg/l
below limit of quantification
 1.5 mg/l
< 3 % *
Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Nickel <0,001 mg/l
below limit of quantification
 20 µg/l
< 5 % *
Mean
Nitrate 12,3 mg/l 50 mg/l
25 %
Mean
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Mean
Polycyclic aromatic hydrocarbons 0 mg/l 0.1 µg/l
0 %
Mean
Selenium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Trihalomethanes — Total 0,006 mg/l 50 µg/l
12 %
Mean
Uranium <0,0001 mg/l
below limit of quantification
 10 µg/l
< 1 % *
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Indicator parameters (21)

Indicator parameters – engelskirchen gesamt
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Ammonium <0,13 mg/l
below limit of quantification
 0.5 mg/l
< 26 % *
Mean
Calcite dissolution capacity 1,1 mg/l 5 mg/l CaCO3 — Mean
Chloride 12,3 mg/l 250 mg/l
5 %
Mean
Clostridium perfringens (including spores) 0 Anzahl/100 ml 0/100 ml — Mean
Coliform bacteria 0 Anzahl/100 ml 0/100 ml — Mean
Colony count 22 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colony count 36 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colour <0,1 m-1
below limit of quantification
 0.5 m⁻¹ — Mean
Conductivity (25 °C) 206 µS/cm 2,790 µS/cm — Mean
Iron 0,021 mg/l 0.2 mg/l
11 %
Mean
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Odour ohne Befund für den Verbraucher annehmbar — Mean
Oxidisability 0,54 mg/l 5 mg/l O2 — Mean
pH 8,2 pH-Einheiten 6,5–9,5 — Mean
Sodium 5,7 mg/l 200 mg/l
3 %
Mean
Sulphate 11,2 mg/l 250 mg/l
4 %
Mean
Taste ohne Befund für den Verbraucher annehmbar — Mean
Temperature 12,1 °C — — Maximum
Total organic carbon (TOC) 1,5 mg/l ohne anormale Veränderung — Mean
Turbidity 0,06 NTU 1 NTU — Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Radiology (1)

Radiology – engelskirchen gesamt
Parameter Value Parametric value Share of the parametric value Reference
Radon-222 <10 Bq/l
below limit of quantification
 100 Bq/l — Mean

Further parameters (9)

Further parameters – engelskirchen gesamt
Parameter Value Parametric value Share of the parametric value Reference
Calcium 26,9 mg/l — — Mean
Carbonate hardness 3,5 °dH — — Mean
Copper quotient 10,1 — — Mean
Magnesium 2,9 mg/l — — Mean
Phosphate <0,03 mg/l
below limit of quantification
 — — Mean
Potassium <1,0 mg/l
below limit of quantification
 — — Mean
Silicate / silicic acid 3,5 mg/l — — Mean
Total hardness 0,79 mmol/l — — Mean
Zinc <0,005 mg/l
below limit of quantification
 — — Mean

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.aggerenergie.de/fileadmin/1aggerenergie/40_wasser_heizung/4.1_wasserversorgung/JMW_2023.pdf · Jahresmittelwert 2023 · retrieved on 11/07/2026

Postcodes in this zone: 51491

gummersbach gesamt

Aggerverband

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness
4.4 °dH
Hardness range soft
Key values gummersbach gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (3)

Microbiology – gummersbach gesamt
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Intestinal enterococci 0 KBE/100 ml 0/100 ml — Mean
Somatic coliphages <2 PFU/100 ml
below limit of quantification
 50/100 ml
UBA guide value
 — Mean

For trifluoroacetic acid (TFA), the German Drinking Water Ordinance does not specify a parametric value. The comparison is therefore made with the guide value of 60 µg/l issued by the Umweltbundesamt, which has replaced the earlier health-related guidance value of 3 µg/l. A guide value is not a legal maximum but a health-related classification.

Chemical parameters (25)

Chemical parameters – gummersbach gesamt
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Antimony <0,0001 mg/l
below limit of quantification
 5 µg/l
< 2 % *
Mean
Arsenic <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Benzene <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Benzo(a)pyrene <0,00001 mg/l
below limit of quantification
 10 ng/l
< 100 % *
Mean
Bisphenol A <0,00003 mg/l
below limit of quantification
 2.5 µg/l
< 1 % *
Mean
Boron 0,008 mg/l 1 mg/l
0.8 %
Mean
Bromate <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Cadmium <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Chromium <0,0005 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Mean
Copper <0,005 mg/l
below limit of quantification
 2 mg/l
< 0.3 % *
Mean
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Fluoride <0,05 mg/l
below limit of quantification
 1.5 mg/l
< 3 % *
Mean
Haloacetic acids (HAA) <0,0060 mg/l
below limit of quantification
 — — Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Microcystin-LR <0,00005 mg/l
below limit of quantification
 — — Mean
Nickel <0,001 mg/l
below limit of quantification
 20 µg/l
< 5 % *
Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Mean
Polycyclic aromatic hydrocarbons 0 mg/l 0.1 µg/l
0 %
Mean
Selenium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Trihalomethanes — Total 0,005 mg/l 50 µg/l
10 %
Mean
Uranium <0,0001 mg/l
below limit of quantification
 10 µg/l
< 1 % *
Mean
Vinyl chloride <0,0001 mg/l
below limit of quantification
 0.5 µg/l
< 20 % *
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

PFAS (1)

PFAS – gummersbach gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean

Indicator parameters (21)

Indicator parameters – gummersbach gesamt
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Ammonium <0,13 mg/l
below limit of quantification
 0.5 mg/l
< 26 % *
Mean
Calcite dissolution capacity 0,37 mg/l 5 mg/l CaCO3 — Mean
Chloride 12,1 mg/l 250 mg/l
5 %
Mean
Clostridium perfringens (including spores) 0 Anzahl/100 ml 0/100 ml — Mean
Coliform bacteria 0 Anzahl/100 ml 0/100 ml — Mean
Colony count 22 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colony count 36 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colour <0,1 m-1
below limit of quantification
 0.5 m⁻¹ — Mean
Conductivity (25 °C) 196 µS/cm 2,790 µS/cm — Mean
Iron 0,015 mg/l 0.2 mg/l
8 %
Mean
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Odour ohne Befund für den Verbraucher annehmbar — Mean
Oxidisability <0,5 mg/l
below limit of quantification
 5 mg/l O2 — Mean
pH 8,2 pH-Einheiten 6,5–9,5 — Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Taste ohne Befund für den Verbraucher annehmbar — Mean
Temperature 13,4 °C — — Maximum
Total organic carbon (TOC) 1,1 mg/l ohne anormale Veränderung — Mean
Turbidity 0,05 NTU 1 NTU — Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Radiology (1)

Radiology – gummersbach gesamt
Parameter Value Parametric value Share of the parametric value Reference
Radon-222 <10 Bq/l
below limit of quantification
 100 Bq/l — Mean

Further parameters (10)

Further parameters – gummersbach gesamt
Parameter Value Parametric value Share of the parametric value Reference
Calcium 26,9 mg/l — — Mean
Carbonate hardness 3,5 °dH — — Mean
Copper quotient 10,1 — — Mean
Lithium <0,10 mg/l
below limit of quantification
 — — Mean
Magnesium 2,7 mg/l — — Mean
Phosphate <0,03 mg/l
below limit of quantification
 — — Mean
Potassium <1,0 mg/l
below limit of quantification
 — — Mean
Silicate / silicic acid 3,1 mg/l — — Mean
Total hardness 0,78 mmol/l — — Mean
Zinc <0,005 mg/l
below limit of quantification
 — — Mean

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.aggerverband.de/trinkwasser/trinkwasseranalyse-qualitaetskontrolle?file=files/assets/trinkwasser/qualitaetskontrolle/JMW_2025.pdf · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 51491

lindlar gesamt

Aggerverband

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness
4.4 °dH
Hardness range soft
Key values lindlar gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (3)

Microbiology – lindlar gesamt
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Intestinal enterococci 0 KBE/100 ml 0/100 ml — Mean
Somatic coliphages <2 PFU/100 ml
below limit of quantification
 50/100 ml
UBA guide value
 — Mean

For trifluoroacetic acid (TFA), the German Drinking Water Ordinance does not specify a parametric value. The comparison is therefore made with the guide value of 60 µg/l issued by the Umweltbundesamt, which has replaced the earlier health-related guidance value of 3 µg/l. A guide value is not a legal maximum but a health-related classification.

Chemical parameters (25)

Chemical parameters – lindlar gesamt
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Antimony <0,0001 mg/l
below limit of quantification
 5 µg/l
< 2 % *
Mean
Arsenic <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Benzene <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Benzo(a)pyrene <0,00001 mg/l
below limit of quantification
 10 ng/l
< 100 % *
Mean
Bisphenol A <0,00003 mg/l
below limit of quantification
 2.5 µg/l
< 1 % *
Mean
Boron 0,008 mg/l 1 mg/l
0.8 %
Mean
Bromate <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Cadmium <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Chromium <0,0005 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Mean
Copper <0,005 mg/l
below limit of quantification
 2 mg/l
< 0.3 % *
Mean
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Fluoride <0,05 mg/l
below limit of quantification
 1.5 mg/l
< 3 % *
Mean
Haloacetic acids (HAA) <0,0060 mg/l
below limit of quantification
 — — Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Microcystin-LR <0,00005 mg/l
below limit of quantification
 — — Mean
Nickel <0,001 mg/l
below limit of quantification
 20 µg/l
< 5 % *
Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Mean
Polycyclic aromatic hydrocarbons 0 mg/l 0.1 µg/l
0 %
Mean
Selenium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Trihalomethanes — Total 0,005 mg/l 50 µg/l
10 %
Mean
Uranium <0,0001 mg/l
below limit of quantification
 10 µg/l
< 1 % *
Mean
Vinyl chloride <0,0001 mg/l
below limit of quantification
 0.5 µg/l
< 20 % *
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

PFAS (1)

PFAS – lindlar gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean

Indicator parameters (21)

Indicator parameters – lindlar gesamt
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Ammonium <0,13 mg/l
below limit of quantification
 0.5 mg/l
< 26 % *
Mean
Calcite dissolution capacity 0,37 mg/l 5 mg/l CaCO3 — Mean
Chloride 12,1 mg/l 250 mg/l
5 %
Mean
Clostridium perfringens (including spores) 0 Anzahl/100 ml 0/100 ml — Mean
Coliform bacteria 0 Anzahl/100 ml 0/100 ml — Mean
Colony count 22 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colony count 36 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colour <0,1 m-1
below limit of quantification
 0.5 m⁻¹ — Mean
Conductivity (25 °C) 196 µS/cm 2,790 µS/cm — Mean
Iron 0,015 mg/l 0.2 mg/l
8 %
Mean
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Odour ohne Befund für den Verbraucher annehmbar — Mean
Oxidisability <0,5 mg/l
below limit of quantification
 5 mg/l O2 — Mean
pH 8,2 pH-Einheiten 6,5–9,5 — Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Taste ohne Befund für den Verbraucher annehmbar — Mean
Temperature 13,4 °C — — Maximum
Total organic carbon (TOC) 1,1 mg/l ohne anormale Veränderung — Mean
Turbidity 0,05 NTU 1 NTU — Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Radiology (1)

Radiology – lindlar gesamt
Parameter Value Parametric value Share of the parametric value Reference
Radon-222 <10 Bq/l
below limit of quantification
 100 Bq/l — Mean

Further parameters (10)

Further parameters – lindlar gesamt
Parameter Value Parametric value Share of the parametric value Reference
Calcium 26,9 mg/l — — Mean
Carbonate hardness 3,5 °dH — — Mean
Copper quotient 10,1 — — Mean
Lithium <0,10 mg/l
below limit of quantification
 — — Mean
Magnesium 2,7 mg/l — — Mean
Phosphate <0,03 mg/l
below limit of quantification
 — — Mean
Potassium <1,0 mg/l
below limit of quantification
 — — Mean
Silicate / silicic acid 3,1 mg/l — — Mean
Total hardness 0,78 mmol/l — — Mean
Zinc <0,005 mg/l
below limit of quantification
 — — Mean

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.aggerverband.de/trinkwasser/trinkwasseranalyse-qualitaetskontrolle?file=files/assets/trinkwasser/qualitaetskontrolle/JMW_2025.pdf · Jahresmittelwert 2025 · retrieved on 11/07/2026

Postcodes in this zone: 51491

nuembrecht gesamt

Aggerverband

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness
4.4 °dH
Hardness range soft
Key values nuembrecht gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (3)

Microbiology – nuembrecht gesamt
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Intestinal enterococci 0 KBE/100 ml 0/100 ml — Mean
Somatic coliphages <2 PFU/100 ml
below limit of quantification
 50/100 ml
UBA guide value
 — Mean

For trifluoroacetic acid (TFA), the German Drinking Water Ordinance does not specify a parametric value. The comparison is therefore made with the guide value of 60 µg/l issued by the Umweltbundesamt, which has replaced the earlier health-related guidance value of 3 µg/l. A guide value is not a legal maximum but a health-related classification.

Chemical parameters (25)

Chemical parameters – nuembrecht gesamt
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Antimony <0,0001 mg/l
below limit of quantification
 5 µg/l
< 2 % *
Mean
Arsenic <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Benzene <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Benzo(a)pyrene <0,00001 mg/l
below limit of quantification
 10 ng/l
< 100 % *
Mean
Bisphenol A <0,00003 mg/l
below limit of quantification
 2.5 µg/l
< 1 % *
Mean
Boron 0,008 mg/l 1 mg/l
0.8 %
Mean
Bromate <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Cadmium <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Chromium <0,0005 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Mean
Copper <0,005 mg/l
below limit of quantification
 2 mg/l
< 0.3 % *
Mean
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Fluoride <0,05 mg/l
below limit of quantification
 1.5 mg/l
< 3 % *
Mean
Haloacetic acids (HAA) <0,0060 mg/l
below limit of quantification
 — — Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Microcystin-LR <0,00005 mg/l
below limit of quantification
 — — Mean
Nickel <0,001 mg/l
below limit of quantification
 20 µg/l
< 5 % *
Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Mean
Polycyclic aromatic hydrocarbons 0 mg/l 0.1 µg/l
0 %
Mean
Selenium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Trihalomethanes — Total 0,005 mg/l 50 µg/l
10 %
Mean
Uranium <0,0001 mg/l
below limit of quantification
 10 µg/l
< 1 % *
Mean
Vinyl chloride <0,0001 mg/l
below limit of quantification
 0.5 µg/l
< 20 % *
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

PFAS (1)

PFAS – nuembrecht gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean

Indicator parameters (21)

Indicator parameters – nuembrecht gesamt
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Ammonium <0,13 mg/l
below limit of quantification
 0.5 mg/l
< 26 % *
Mean
Calcite dissolution capacity 0,37 mg/l 5 mg/l CaCO3 — Mean
Chloride 12,1 mg/l 250 mg/l
5 %
Mean
Clostridium perfringens (including spores) 0 Anzahl/100 ml 0/100 ml — Mean
Coliform bacteria 0 Anzahl/100 ml 0/100 ml — Mean
Colony count 22 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colony count 36 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colour <0,1 m-1
below limit of quantification
 0.5 m⁻¹ — Mean
Conductivity (25 °C) 196 µS/cm 2,790 µS/cm — Mean
Iron 0,015 mg/l 0.2 mg/l
8 %
Mean
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Odour ohne Befund für den Verbraucher annehmbar — Mean
Oxidisability <0,5 mg/l
below limit of quantification
 5 mg/l O2 — Mean
pH 8,2 pH-Einheiten 6,5–9,5 — Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Taste ohne Befund für den Verbraucher annehmbar — Mean
Temperature 13,4 °C — — Maximum
Total organic carbon (TOC) 1,1 mg/l ohne anormale Veränderung — Mean
Turbidity 0,05 NTU 1 NTU — Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Radiology (1)

Radiology – nuembrecht gesamt
Parameter Value Parametric value Share of the parametric value Reference
Radon-222 <10 Bq/l
below limit of quantification
 100 Bq/l — Mean

Further parameters (10)

Further parameters – nuembrecht gesamt
Parameter Value Parametric value Share of the parametric value Reference
Calcium 26,9 mg/l — — Mean
Carbonate hardness 3,5 °dH — — Mean
Copper quotient 10,1 — — Mean
Lithium <0,10 mg/l
below limit of quantification
 — — Mean
Magnesium 2,7 mg/l — — Mean
Phosphate <0,03 mg/l
below limit of quantification
 — — Mean
Potassium <1,0 mg/l
below limit of quantification
 — — Mean
Silicate / silicic acid 3,1 mg/l — — Mean
Total hardness 0,78 mmol/l — — Mean
Zinc <0,005 mg/l
below limit of quantification
 — — Mean

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.aggerverband.de/files/assets/trinkwasser/qualitaetskontrolle/JMW_2025.pdf · Jahresmittelwert 2025 · retrieved on 11/07/2026

Postcodes in this zone: 51491

overath gesamt

BELKAW

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness
12.8 °dH
Hardness range mittel
Key values overath gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0,000014 mg/l — — Single value
Nitrate 19 mg/l 50 mg/l
38 %
Single value
Lead <0,0005 mg/l
below limit of quantification
 10 µg/l
< 5 % *
Single value
Escherichia coli (E. coli) 0 /100 ml 0/100 ml — Single value
Sulphate 54 mg/l 250 mg/l
22 %
Single value
Sodium 24 mg/l 200 mg/l
12 %
Single value

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Show all recorded parameters (77 — most recent value per parameter)

Microbiology (2)

Microbiology – overath gesamt
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 /100 ml 0/100 ml — Single value
Intestinal enterococci 0 /100 ml 0/100 ml — Single value

Chemical parameters (24)

Chemical parameters – overath gesamt
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,0002 mg/l
below limit of quantification
 3 µg/l
< 7 % *
Single value
Antimony <0,0005 mg/l
below limit of quantification
 5 µg/l
< 10 % *
Single value
Arsenic <0,0005 mg/l
below limit of quantification
 10 µg/l
< 5 % *
Single value
Benzene <0,0002 mg/l
below limit of quantification
 1 µg/l
< 20 % *
Single value
Benzo(a)pyrene <0,000003 mg/l
below limit of quantification
 10 ng/l
< 30 % *
Single value
Bisphenol A <0,00003 mg/l
below limit of quantification
 2.5 µg/l
< 1 % *
Single value
Boron 0,06 mg/l 1 mg/l
6 %
Single value
Bromate <0,003 mg/l
below limit of quantification
 10 µg/l
< 30 % *
Single value
Cadmium <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Single value
Chromium <0,0005 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Single value
Copper <0,02 mg/l
below limit of quantification
 2 mg/l
< 1 % *
Single value
Cyanide <0,015 mg/l
below limit of quantification
 50 µg/l
< 30 % *
Single value
Fluoride <0,05 mg/l
below limit of quantification
 1.5 mg/l
< 3 % *
Single value
Lead <0,0005 mg/l
below limit of quantification
 10 µg/l
< 5 % *
Single value
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Single value
Nickel <0,001 mg/l
below limit of quantification
 20 µg/l
< 5 % *
Single value
Nitrate 19 mg/l 50 mg/l
38 %
Single value
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Single value
Pesticides <0,0005 mg/l
below limit of quantification
 0.1 µg/l cannot be assessed — the limit of quantification of the measurement is above the parametric value Single value
Polycyclic aromatic hydrocarbons <0,00001 mg/l
below limit of quantification
 0.1 µg/l
< 10 % *
Single value
Selenium <0,0005 mg/l
below limit of quantification
 10 µg/l
< 5 % *
Single value
Tetrachloroethene and Trichloroethene (sum) 0,0003 mg/l 10 µg/l
3 %
Single value
Trihalomethanes — Total <0,0002 mg/l
below limit of quantification
 50 µg/l
< 0.4 % *
Single value
Uranium 0,0002 mg/l 10 µg/l
2 %
Single value

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

PFAS (22)

PFAS – overath gesamt
Parameter Value Parametric value Share of the parametric value Reference
Perfluorobutane sulfonic acid (PFBS) 0,0000043 mg/l — — Single value
Perfluorobutanoic acid (PFBA) 0,0000030 mg/l — — Single value
Perfluorodecane sulfonic acid (PFDS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorodecanoic acid (PFDA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorododecane sulfonic acid (PFDoDS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorododecanoic acid (PFDoDA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoroheptane sulfonic acid (PFHpS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoroheptanoic acid (PFHpA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorohexane sulfonic acid (PFHxS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorohexanoic acid (PFHxA) 0,0000032 mg/l — — Single value
Perfluorononane sulfonic acid (PFNS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorononanoic acid (PFNA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorooctanesulfonic acid (PFOS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorooctanoic acid (PFOA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoropentanesulfonic acid (PFPeS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoropentanoic acid (PFPeA) 0,0000031 mg/l — — Single value
Perfluorotridecanesulfonic acid (PFTrDS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorotridecanoic acid (PFTrDA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoroundecanesulfonic acid (PFUnDS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoroundecanoic acid (PFUnDA) <0,000001 mg/l
below limit of quantification
 — — Single value
Sum of 4 PFAS <0,000001 mg/l
below limit of quantification
 — — Single value
Sum of PFAS 0,000014 mg/l — — Single value

Indicator parameters (18)

Indicator parameters – overath gesamt
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,04 mg/l
below limit of quantification
 0.2 mg/l
< 20 % *
Single value
Ammonium <0,05 mg/l
below limit of quantification
 0.5 mg/l
< 10 % *
Single value
Calcite dissolution capacity -1,8 mg/l 5 mg/l CaCO3 — Single value
Chloride 44 mg/l 250 mg/l
18 %
Single value
Colony count 22 °C 0 /ml ohne anormale Veränderung — Single value
Colony count 36 °C 0 /ml ohne anormale Veränderung — Single value
Colour <0,1 m-1
below limit of quantification
 0.5 m⁻¹ — Single value
Conductivity (25 °C) 565 µS/cm 2,790 µS/cm — Single value
Iron <0,02 mg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Single value
Manganese <0,001 mg/l
below limit of quantification
 50 µg/l
< 2 % *
Single value
Odour ohne anormale Veränderung für den Verbraucher annehmbar — Single value
pH 7,59 6,5–9,5 — Single value
Sodium 24 mg/l 200 mg/l
12 %
Single value
Sulphate 54 mg/l 250 mg/l
22 %
Single value
Taste ohne anormale Veränderung für den Verbraucher annehmbar — Single value
Temperature 12,6 °C — — Single value
Total organic carbon (TOC) 0,41 mg/l ohne anormale Veränderung — Single value
Turbidity 0,05 NTU 1 NTU — Single value

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Further parameters (11)

Further parameters – overath gesamt
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 3,0 mol/m³ — — Single value
Base capacity to pH 8.2 0,18 mol/m³ — — Single value
Calcium 69 mg/l — — Single value
Carbonate hardness 8,4 °dH — — Single value
Hardness range (WRMG) mittel — — Single value
Hydrogen carbonate 182 mg/l — — Single value
Magnesium 14 mg/l — — Single value
Oxygen 9 mg/l — — Single value
Phosphate 1,2 mg/l — — Single value
Potassium 2,5 mg/l — — Single value
Total hardness 12,8 °dH — — Single value

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.stadtwerke-overath.de/fileadmin/user_upload/PDF/trinkwasseranalyse-belkaw-2026.pdf · Ausgabe 2026 · Jahresmittelwerte der Daten aus 2025 · retrieved on 13/07/2026

Postcodes in this zone: 51491

reichshof gesamt

Aggerverband

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness
4.4 °dH
Hardness range soft
Key values reichshof gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (3)

Microbiology – reichshof gesamt
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Intestinal enterococci 0 KBE/100 ml 0/100 ml — Mean
Somatic coliphages <2 PFU/100 ml
below limit of quantification
 50/100 ml
UBA guide value
 — Mean

For trifluoroacetic acid (TFA), the German Drinking Water Ordinance does not specify a parametric value. The comparison is therefore made with the guide value of 60 µg/l issued by the Umweltbundesamt, which has replaced the earlier health-related guidance value of 3 µg/l. A guide value is not a legal maximum but a health-related classification.

Chemical parameters (25)

Chemical parameters – reichshof gesamt
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Antimony <0,0001 mg/l
below limit of quantification
 5 µg/l
< 2 % *
Mean
Arsenic <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Benzene <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Benzo(a)pyrene <0,00001 mg/l
below limit of quantification
 10 ng/l
< 100 % *
Mean
Bisphenol A <0,00003 mg/l
below limit of quantification
 2.5 µg/l
< 1 % *
Mean
Boron 0,008 mg/l 1 mg/l
0.8 %
Mean
Bromate <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Cadmium <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Chromium <0,0005 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Mean
Copper <0,005 mg/l
below limit of quantification
 2 mg/l
< 0.3 % *
Mean
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Fluoride <0,05 mg/l
below limit of quantification
 1.5 mg/l
< 3 % *
Mean
Haloacetic acids (HAA) <0,0060 mg/l
below limit of quantification
 — — Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Microcystin-LR <0,00005 mg/l
below limit of quantification
 — — Mean
Nickel <0,001 mg/l
below limit of quantification
 20 µg/l
< 5 % *
Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Mean
Polycyclic aromatic hydrocarbons 0 mg/l 0.1 µg/l
0 %
Mean
Selenium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Trihalomethanes — Total 0,005 mg/l 50 µg/l
10 %
Mean
Uranium <0,0001 mg/l
below limit of quantification
 10 µg/l
< 1 % *
Mean
Vinyl chloride <0,0001 mg/l
below limit of quantification
 0.5 µg/l
< 20 % *
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

PFAS (1)

PFAS – reichshof gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean

Indicator parameters (21)

Indicator parameters – reichshof gesamt
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Ammonium <0,13 mg/l
below limit of quantification
 0.5 mg/l
< 26 % *
Mean
Calcite dissolution capacity 0,37 mg/l 5 mg/l CaCO3 — Mean
Chloride 12,1 mg/l 250 mg/l
5 %
Mean
Clostridium perfringens (including spores) 0 Anzahl/100 ml 0/100 ml — Mean
Coliform bacteria 0 Anzahl/100 ml 0/100 ml — Mean
Colony count 22 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colony count 36 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colour <0,1 m-1
below limit of quantification
 0.5 m⁻¹ — Mean
Conductivity (25 °C) 196 µS/cm 2,790 µS/cm — Mean
Iron 0,015 mg/l 0.2 mg/l
8 %
Mean
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Odour ohne Befund für den Verbraucher annehmbar — Mean
Oxidisability <0,5 mg/l
below limit of quantification
 5 mg/l O2 — Mean
pH 8,2 pH-Einheiten 6,5–9,5 — Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Taste ohne Befund für den Verbraucher annehmbar — Mean
Temperature 13,4 °C — — Maximum
Total organic carbon (TOC) 1,1 mg/l ohne anormale Veränderung — Mean
Turbidity 0,05 NTU 1 NTU — Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Radiology (1)

Radiology – reichshof gesamt
Parameter Value Parametric value Share of the parametric value Reference
Radon-222 <10 Bq/l
below limit of quantification
 100 Bq/l — Mean

Further parameters (10)

Further parameters – reichshof gesamt
Parameter Value Parametric value Share of the parametric value Reference
Calcium 26,9 mg/l — — Mean
Carbonate hardness 3,5 °dH — — Mean
Copper quotient 10,1 — — Mean
Lithium <0,10 mg/l
below limit of quantification
 — — Mean
Magnesium 2,7 mg/l — — Mean
Phosphate <0,03 mg/l
below limit of quantification
 — — Mean
Potassium <1,0 mg/l
below limit of quantification
 — — Mean
Silicate / silicic acid 3,1 mg/l — — Mean
Total hardness 0,78 mmol/l — — Mean
Zinc <0,005 mg/l
below limit of quantification
 — — Mean

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.aggerverband.de/trinkwasser/trinkwasseranalyse-qualitaetskontrolle?file=files/assets/trinkwasser/qualitaetskontrolle/JMW_2025.pdf · Jahresmittelwert 2025 · retrieved on 11/07/2026

Postcodes in this zone: 51491

waldbroel gesamt

Aggerverband

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness
4.4 °dH
Hardness range soft
Key values waldbroel gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (3)

Microbiology – waldbroel gesamt
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Intestinal enterococci 0 KBE/100 ml 0/100 ml — Mean
Somatic coliphages <2 PFU/100 ml
below limit of quantification
 50/100 ml
UBA guide value
 — Mean

For trifluoroacetic acid (TFA), the German Drinking Water Ordinance does not specify a parametric value. The comparison is therefore made with the guide value of 60 µg/l issued by the Umweltbundesamt, which has replaced the earlier health-related guidance value of 3 µg/l. A guide value is not a legal maximum but a health-related classification.

Chemical parameters (25)

Chemical parameters – waldbroel gesamt
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Antimony <0,0001 mg/l
below limit of quantification
 5 µg/l
< 2 % *
Mean
Arsenic <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Benzene <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Benzo(a)pyrene <0,00001 mg/l
below limit of quantification
 10 ng/l
< 100 % *
Mean
Bisphenol A <0,00003 mg/l
below limit of quantification
 2.5 µg/l
< 1 % *
Mean
Boron 0,008 mg/l 1 mg/l
0.8 %
Mean
Bromate <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Cadmium <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Chromium <0,0005 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Mean
Copper <0,005 mg/l
below limit of quantification
 2 mg/l
< 0.3 % *
Mean
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Fluoride <0,05 mg/l
below limit of quantification
 1.5 mg/l
< 3 % *
Mean
Haloacetic acids (HAA) <0,0060 mg/l
below limit of quantification
 — — Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Microcystin-LR <0,00005 mg/l
below limit of quantification
 — — Mean
Nickel <0,001 mg/l
below limit of quantification
 20 µg/l
< 5 % *
Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Mean
Polycyclic aromatic hydrocarbons 0 mg/l 0.1 µg/l
0 %
Mean
Selenium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Trihalomethanes — Total 0,005 mg/l 50 µg/l
10 %
Mean
Uranium <0,0001 mg/l
below limit of quantification
 10 µg/l
< 1 % *
Mean
Vinyl chloride <0,0001 mg/l
below limit of quantification
 0.5 µg/l
< 20 % *
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

PFAS (1)

PFAS – waldbroel gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean

Indicator parameters (21)

Indicator parameters – waldbroel gesamt
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Ammonium <0,13 mg/l
below limit of quantification
 0.5 mg/l
< 26 % *
Mean
Calcite dissolution capacity 0,37 mg/l 5 mg/l CaCO3 — Mean
Chloride 12,1 mg/l 250 mg/l
5 %
Mean
Clostridium perfringens (including spores) 0 Anzahl/100 ml 0/100 ml — Mean
Coliform bacteria 0 Anzahl/100 ml 0/100 ml — Mean
Colony count 22 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colony count 36 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colour <0,1 m-1
below limit of quantification
 0.5 m⁻¹ — Mean
Conductivity (25 °C) 196 µS/cm 2,790 µS/cm — Mean
Iron 0,015 mg/l 0.2 mg/l
8 %
Mean
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Odour ohne Befund für den Verbraucher annehmbar — Mean
Oxidisability <0,5 mg/l
below limit of quantification
 5 mg/l O2 — Mean
pH 8,2 pH-Einheiten 6,5–9,5 — Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Taste ohne Befund für den Verbraucher annehmbar — Mean
Temperature 4,1 - 13,4 °C — — Mean
Total organic carbon (TOC) 1,1 mg/l ohne anormale Veränderung — Mean
Turbidity 0,05 NTU 1 NTU — Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Radiology (1)

Radiology – waldbroel gesamt
Parameter Value Parametric value Share of the parametric value Reference
Radon-222 <10 Bq/l
below limit of quantification
 100 Bq/l — Mean

Further parameters (10)

Further parameters – waldbroel gesamt
Parameter Value Parametric value Share of the parametric value Reference
Calcium 26,9 mg/l — — Mean
Carbonate hardness 3,5 °dH — — Mean
Copper quotient 10,1 — — Mean
Lithium <0,10 mg/l
below limit of quantification
 — — Mean
Magnesium 2,7 mg/l — — Mean
Phosphate <0,03 mg/l
below limit of quantification
 — — Mean
Potassium <1,0 mg/l
below limit of quantification
 — — Mean
Silicate / silicic acid 3,1 mg/l — — Mean
Total hardness 0,78 mmol/l — — Mean
Zinc <0,005 mg/l
below limit of quantification
 — — Mean

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.aggerverband.de/trinkwasser/trinkwasseranalyse-qualitaetskontrolle?file=files/assets/trinkwasser/qualitaetskontrolle/JMW_2025.pdf · Jahresmittelwert 2025 · retrieved on 11/07/2026

Postcodes in this zone: 51491

Wasserwerk Erlenhagen

Aggerverband

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness
4.5 °dH
Hardness range soft
Key values Wasserwerk Erlenhagen
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 MPN/100 ml 0/100 ml — Single value
Show all recorded parameters (49 — most recent value per parameter)

Microbiology (2)

Microbiology – Wasserwerk Erlenhagen
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 MPN/100 ml 0/100 ml — Single value
Intestinal enterococci 0 KBE/100 ml 0/100 ml — Single value

Chemical parameters (12)

Chemical parameters – Wasserwerk Erlenhagen
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,00010 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Single value
Benzene <0,00010 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Single value
Benzo(a)pyrene <0,000010 mg/l
below limit of quantification
 10 ng/l
< 100 % *
Single value
Chromium <0,00050 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Single value
Cyanide <0,0050 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Single value
Dibromoacetic acid <0,001 mg/l
below limit of quantification
 — — Single value
Dichloroacetic acid 0,0018 mg/l — — Single value
Monobromoacetic acid <0,001 mg/l
below limit of quantification
 — — Single value
Monochloroacetic acid <0,001 mg/l
below limit of quantification
 — — Single value
Polycyclic aromatic hydrocarbons 0 mg/l 0.1 µg/l
0 %
Single value
Trichloroacetic acid <0,001 mg/l
below limit of quantification
 — — Single value
Trihalomethanes — Total 0,0058 mg/l 50 µg/l
12 %
Single value

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

PFAS (18)

PFAS – Wasserwerk Erlenhagen
Parameter Value Parametric value Share of the parametric value Reference
Perfluorobutane sulfonic acid (PFBS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorobutanoic acid (PFBA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorodecanoic acid (PFDA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorododecane sulfonic acid (PFDoDS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorododecanoic acid (PFDoDA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoroheptane sulfonic acid (PFHpS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoroheptanoic acid (PFHpA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorohexane sulfonic acid (PFHxS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorohexanoic acid (PFHxA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorononane sulfonic acid (PFNS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorononanoic acid (PFNA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorooctanesulfonic acid (PFOS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorooctanoic acid (PFOA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoropentanesulfonic acid (PFPeS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoropentanoic acid (PFPeA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorotridecanesulfonic acid (PFTrDS) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluorotridecanoic acid (PFTrDA) <0,000001 mg/l
below limit of quantification
 — — Single value
Perfluoroundecanoic acid (PFUnDA) <0,000001 mg/l
below limit of quantification
 — — Single value

Indicator parameters (15)

Indicator parameters – Wasserwerk Erlenhagen
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Single value
Ammonium <0,13 mg/l
below limit of quantification
 0.5 mg/l
< 26 % *
Single value
Clostridium perfringens (including spores) 0 KBE/100 ml 0/100 ml — Single value
Coliform bacteria 0 MPN/100 ml 0/100 ml — Single value
Colony count 22 °C 0 KBE/ml ohne anormale Veränderung — Single value
Colony count 36 °C 0 KBE/ml ohne anormale Veränderung — Single value
Iron 0,020 mg/l 0.2 mg/l
10 %
Single value
Manganese <0,0050 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Single value
Odour kein ungewöhnlicher Geruch für den Verbraucher annehmbar — Single value
pH 8,2 6,5–9,5 — Single value
Taste o.B. für den Verbraucher annehmbar — Single value
Temperature 5,5 °C — — Single value
Threshold odour number (TON) <1 TON
below limit of quantification
 — — Single value
Total organic carbon (TOC) 2,5 mg/l ohne anormale Veränderung — Single value
Turbidity 0,05 NTU 1 NTU — Single value

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Further parameters (2)

Further parameters – Wasserwerk Erlenhagen
Parameter Value Parametric value Share of the parametric value Reference
Copper quotient 9,2 — — Single value
Total hardness 4,5 °dH — — Single value

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.bergische-energie.de/fileadmin/user_upload/03_Wasser/5_Sonstige/Wipperfuerth_Analyse__April_2026_Wasserwerk_Erlenhagen.pdf · 07.04.2026 · retrieved on 11/07/2026

Postcodes in this zone: 51491

wiehl gesamt

Aggerverband

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness
4.4 °dH
Hardness range soft
Key values wiehl gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (3)

Microbiology – wiehl gesamt
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 Anzahl/100 ml 0/100 ml — Mean
Intestinal enterococci 0 KBE/100 ml 0/100 ml — Mean
Somatic coliphages <2 PFU/100 ml
below limit of quantification
 50/100 ml
UBA guide value
 — Mean

For trifluoroacetic acid (TFA), the German Drinking Water Ordinance does not specify a parametric value. The comparison is therefore made with the guide value of 60 µg/l issued by the Umweltbundesamt, which has replaced the earlier health-related guidance value of 3 µg/l. A guide value is not a legal maximum but a health-related classification.

Chemical parameters (25)

Chemical parameters – wiehl gesamt
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Antimony <0,0001 mg/l
below limit of quantification
 5 µg/l
< 2 % *
Mean
Arsenic <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Benzene <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Benzo(a)pyrene <0,00001 mg/l
below limit of quantification
 10 ng/l
< 100 % *
Mean
Bisphenol A <0,00003 mg/l
below limit of quantification
 2.5 µg/l
< 1 % *
Mean
Boron 0,008 mg/l 1 mg/l
0.8 %
Mean
Bromate <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Cadmium <0,0001 mg/l
below limit of quantification
 3 µg/l
< 3 % *
Mean
Chromium <0,0005 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Mean
Copper <0,005 mg/l
below limit of quantification
 2 mg/l
< 0.3 % *
Mean
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Fluoride <0,05 mg/l
below limit of quantification
 1.5 mg/l
< 3 % *
Mean
Haloacetic acids (HAA) <0,0060 mg/l
below limit of quantification
 — — Mean
Lead <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Microcystin-LR <0,00005 mg/l
below limit of quantification
 — — Mean
Nickel <0,001 mg/l
below limit of quantification
 20 µg/l
< 5 % *
Mean
Nitrate 6,8 mg/l 50 mg/l
14 %
Mean
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Mean
Polycyclic aromatic hydrocarbons 0 mg/l 0.1 µg/l
0 %
Mean
Selenium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Trihalomethanes — Total 0,005 mg/l 50 µg/l
10 %
Mean
Uranium <0,0001 mg/l
below limit of quantification
 10 µg/l
< 1 % *
Mean
Vinyl chloride <0,0001 mg/l
below limit of quantification
 0.5 µg/l
< 20 % *
Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

PFAS (1)

PFAS – wiehl gesamt
Parameter Value Parametric value Share of the parametric value Reference
Sum of PFAS 0 mg/l — — Mean

Indicator parameters (21)

Indicator parameters – wiehl gesamt
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Ammonium <0,13 mg/l
below limit of quantification
 0.5 mg/l
< 26 % *
Mean
Calcite dissolution capacity 0,37 mg/l 5 mg/l CaCO3 — Mean
Chloride 12,1 mg/l 250 mg/l
5 %
Mean
Clostridium perfringens (including spores) 0 Anzahl/100 ml 0/100 ml — Mean
Coliform bacteria 0 Anzahl/100 ml 0/100 ml — Mean
Colony count 22 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colony count 36 °C <1 KBE/ml
below limit of quantification
 ohne anormale Veränderung — Mean
Colour <0,1 m-1
below limit of quantification
 0.5 m⁻¹ — Mean
Conductivity (25 °C) 196 µS/cm 2,790 µS/cm — Mean
Iron 0,015 mg/l 0.2 mg/l
8 %
Mean
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Mean
Odour ohne Befund für den Verbraucher annehmbar — Mean
Oxidisability <0,5 mg/l
below limit of quantification
 5 mg/l O2 — Mean
pH 8,2 pH-Einheiten 6,5–9,5 — Mean
Sodium 5,4 mg/l 200 mg/l
3 %
Mean
Sulphate 11,8 mg/l 250 mg/l
5 %
Mean
Taste ohne Befund für den Verbraucher annehmbar — Mean
Temperature 13,4 °C — — Maximum
Total organic carbon (TOC) 1,1 mg/l ohne anormale Veränderung — Mean
Turbidity 0,05 NTU 1 NTU — Mean

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Radiology (1)

Radiology – wiehl gesamt
Parameter Value Parametric value Share of the parametric value Reference
Radon-222 <10 Bq/l
below limit of quantification
 100 Bq/l — Mean

Further parameters (10)

Further parameters – wiehl gesamt
Parameter Value Parametric value Share of the parametric value Reference
Calcium 26,9 mg/l — — Mean
Carbonate hardness 3,5 °dH — — Mean
Copper quotient 10,1 — — Mean
Lithium <0,10 mg/l
below limit of quantification
 — — Mean
Magnesium 2,7 mg/l — — Mean
Phosphate <0,03 mg/l
below limit of quantification
 — — Mean
Potassium <1,0 mg/l
below limit of quantification
 — — Mean
Silicate / silicic acid 3,1 mg/l — — Mean
Total hardness 0,78 mmol/l — — Mean
Zinc <0,005 mg/l
below limit of quantification
 — — Mean

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.aggerverband.de/files/assets/trinkwasser/qualitaetskontrolle/JMW_2025.pdf · Jahresmittelwert 2025 · retrieved on 11/07/2026

Postcodes in this zone: 51491

PFAS-4

BELKAW

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

No core values are available for this zone yet.

Show all recorded parameters (4 — most recent value per parameter)

PFAS (4)

PFAS – PFAS-4
Parameter Value Parametric value Share of the parametric value Reference
Perfluorohexane sulfonic acid (PFHxS) <0,000001 mg/l
below limit of quantification
 — — Single value · PFAS-4
Perfluorononanoic acid (PFNA) <0,000001 mg/l
below limit of quantification
 — — Single value · PFAS-4
Perfluorooctanesulfonic acid (PFOS) <0,000001 mg/l
below limit of quantification
 — — Single value · PFAS-4
Perfluorooctanoic acid (PFOA) <0,000001 mg/l
below limit of quantification
 — — Single value · PFAS-4

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.stadtwerke-overath.de/fileadmin/user_upload/PDF/trinkwasseranalyse-belkaw-2026.pdf · Ausgabe 2026 · Jahresmittelwerte der Daten aus 2025 · retrieved on 13/07/2026

Postcodes in this zone: 51491

Frequently asked questions about drinking water in Overath

How much nitrate is in the drinking water in Overath?
SWB Energie und Wasser (Stadtwerke Bonn); Wasserlieferant: Wahnbachtalsperrenverband (WTV) publishes a nitrate value of 19 mg/l for the supply zone bonn gesamt. The statutory parametric value is 50 mg/l; the measured value represents 38 % of the parametric value. Basis: Publication by the water supplier, retrieved on 25/07/2026.
Who supplies the drinking water in Overath?
SWB Energie und Wasser (Stadtwerke Bonn); Wasserlieferant: Wahnbachtalsperrenverband (WTV). The values shown here come from the supply zone bonn gesamt and apply to the water the supplier delivers. What happens between the building connection and the tap — in old lead pipes, for example — is not covered by these analyses; information on that is provided by owners, the health authority or an examination by an accredited laboratory.

General questions — how current the data is, limit of quantification, parametric values, who is behind this site — are answered under Questions & answers.