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Drinking water in Bottrop

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.

Dorsten-Holsterhausen

RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH

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

Water hardness
13.5 °dH
Hardness range mittel
Key values Dorsten-Holsterhausen
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 9,6 mg/l 50 mg/l
19 %
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Sulphate 60 mg/l 250 mg/l
24 %
Median
Sodium 11,3 mg/l 200 mg/l
6 %
Median

* 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 (46 — most recent value per parameter)

Chemical parameters (24)

Chemical parameters – Dorsten-Holsterhausen
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,3 µg/l
below limit of quantification
 3 µg/l
< 10 % *
Median
Antimony <1 µg/l
below limit of quantification
 5 µg/l
< 20 % *
Median
Arsenic 1 µg/l 10 µg/l
10 %
Median
Benzene <0,2 µg/l
below limit of quantification
 1 µg/l
< 20 % *
Median
Benzo(a)pyrene <0,002 µg/l
below limit of quantification
 10 ng/l
< 20 % *
Median
Boron <0,05 mg/l
below limit of quantification
 1 mg/l
< 5 % *
Median
Bromate <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Cadmium <0,2 µg/l
below limit of quantification
 3 µg/l
< 7 % *
Median
Chromium <5 µg/l
below limit of quantification
 25 µg/l
< 20 % *
Median
Copper <20 µg/l
below limit of quantification
 2 mg/l
< 1 % *
Median
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
Fluoride <0,2 mg/l
below limit of quantification
 1.5 mg/l
< 13 % *
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Mercury <0,1 µg/l
below limit of quantification
 1 µg/l
< 10 % *
Median
Nickel <1 µg/l
below limit of quantification
 20 µg/l
< 5 % *
Median
Nitrate 9,6 mg/l 50 mg/l
19 %
Median
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Median
Pesticides n.n. µg/l
not detectable
 0.1 µg/l — Median
Pesticides — Total n.n. µg/l
not detectable
 0.5 µg/l — Median
Polycyclic aromatic hydrocarbons n.n. µg/l
not detectable
 0.1 µg/l — Median
Selenium <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Tetrachloroethene and Trichloroethene (sum) <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Trihalomethanes — Total <1 µg/l
below limit of quantification
 50 µg/l
< 2 % *
Median
Uranium <0,5 µg/l
below limit of quantification
 10 µg/l
< 5 % *
Median

* 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 (13)

Indicator parameters – Dorsten-Holsterhausen
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <20 µg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Ammonium <0,04 mg/l
below limit of quantification
 0.5 mg/l
< 8 % *
Median
Chloride 26 mg/l 250 mg/l
10 %
Median
Colour <0,05 1/m
below limit of quantification
 0.5 m⁻¹ — Median
Conductivity (25 °C) 517 µS/cm 2,790 µS/cm — Median
Iron <0,02 mg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
pH 7,45 6,5–9,5 — Median
Sodium 11,3 mg/l 200 mg/l
6 %
Median
Sulphate 60 mg/l 250 mg/l
24 %
Median
Temperature 11,8 °C — — Median
Total organic carbon (TOC) 0,6 mg/l ohne anormale Veränderung — Median
Turbidity <0,1 NTU
below limit of quantification
 1 NTU — Median

* 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 (9)

Further parameters – Dorsten-Holsterhausen
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 3,10 mmol/l — — Median
Calcium 89,5 mg/l — — Median
Carbonate hardness 8,7 °dH — — Median
Hardness range (WRMG) mittel — — Median
Magnesium 4,1 mg/l — — Median
Phosphate 1,5 mg/l — — Median
Potassium 2,2 mg/l — — Median
Sum of alkaline earth metals 2,40 mmol/l — — Median
Total hardness 13,5 °dH — — Median

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.rww.de/fileadmin/assets/pdf/twa_whh_dor_gla_bot_ob_med.pdf · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Show 11 more supply zones

Essen-Kettwig

RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH

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

Water hardness
8.2 °dH
Hardness range weich
Key values Essen-Kettwig
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 9,9 mg/l 50 mg/l
20 %
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Sulphate 46 mg/l 250 mg/l
18 %
Median
Sodium 56,2 mg/l 200 mg/l
28 %
Median

* 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 (46 — most recent value per parameter)

Chemical parameters (24)

Chemical parameters – Essen-Kettwig
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,3 µg/l
below limit of quantification
 3 µg/l
< 10 % *
Median
Antimony <1 µg/l
below limit of quantification
 5 µg/l
< 20 % *
Median
Arsenic <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Benzene <0,2 µg/l
below limit of quantification
 1 µg/l
< 20 % *
Median
Benzo(a)pyrene <0,002 µg/l
below limit of quantification
 10 ng/l
< 20 % *
Median
Boron 0,07 mg/l 1 mg/l
7 %
Median
Bromate <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Cadmium <0,2 µg/l
below limit of quantification
 3 µg/l
< 7 % *
Median
Chromium <5 µg/l
below limit of quantification
 25 µg/l
< 20 % *
Median
Copper <20 µg/l
below limit of quantification
 2 mg/l
< 1 % *
Median
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
Fluoride <0,2 mg/l
below limit of quantification
 1.5 mg/l
< 13 % *
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Mercury <0,1 µg/l
below limit of quantification
 1 µg/l
< 10 % *
Median
Nickel <1 µg/l
below limit of quantification
 20 µg/l
< 5 % *
Median
Nitrate 9,9 mg/l 50 mg/l
20 %
Median
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Median
Pesticides n.n. µg/l
not detectable
 0.1 µg/l — Median
Pesticides — Total n.n. µg/l
not detectable
 0.5 µg/l — Median
Polycyclic aromatic hydrocarbons n.n. µg/l
not detectable
 0.1 µg/l — Median
Selenium <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Tetrachloroethene and Trichloroethene (sum) <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Trihalomethanes — Total <1 µg/l
below limit of quantification
 50 µg/l
< 2 % *
Median
Uranium <0,5 µg/l
below limit of quantification
 10 µg/l
< 5 % *
Median

* 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 (13)

Indicator parameters – Essen-Kettwig
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <20 µg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Ammonium <0,04 mg/l
below limit of quantification
 0.5 mg/l
< 8 % *
Median
Chloride 70 mg/l 250 mg/l
28 %
Median
Colour <0,05 1/m
below limit of quantification
 0.5 m⁻¹ — Median
Conductivity (25 °C) 621 µS/cm 2,790 µS/cm — Median
Iron <0,02 mg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
pH 7,84 6,5–9,5 — Median
Sodium 56,2 mg/l 200 mg/l
28 %
Median
Sulphate 46 mg/l 250 mg/l
18 %
Median
Temperature 18,4 °C — — Median
Total organic carbon (TOC) <0,5 mg/l
below limit of quantification
 ohne anormale Veränderung — Median
Turbidity <0,1 NTU
below limit of quantification
 1 NTU — Median

* 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 (9)

Further parameters – Essen-Kettwig
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 2,58 mmol/l — — Median
Calcium 45,4 mg/l — — Median
Carbonate hardness 7,2 °dH — — Median
Hardness range (WRMG) weich — — Median
Magnesium 8,2 mg/l — — Median
Phosphate 1,6 mg/l — — Median
Potassium 4,5 mg/l — — Median
Sum of alkaline earth metals 1,47 mmol/l — — Median
Total hardness 8,2 °dH — — Median

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.sw-wuelfrath.de/fileadmin/user_upload/downloads/wasser/Trinkwasserdaten_2025.pdf · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Mülheim-Styrum-Ost, Mülheim-Styrum-West

RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH

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

Water hardness
8 °dH
Hardness range weich
Key values Mülheim-Styrum-Ost, Mülheim-Styrum-West
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 8,7 mg/l 50 mg/l
17 %
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Sulphate 47 mg/l 250 mg/l
19 %
Median
Sodium 55,8 mg/l 200 mg/l
28 %
Median

* 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 (46 — most recent value per parameter)

Chemical parameters (24)

Chemical parameters – Mülheim-Styrum-Ost, Mülheim-Styrum-West
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,3 µg/l
below limit of quantification
 3 µg/l
< 10 % *
Median
Antimony <1 µg/l
below limit of quantification
 5 µg/l
< 20 % *
Median
Arsenic <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Benzene <0,2 µg/l
below limit of quantification
 1 µg/l
< 20 % *
Median
Benzo(a)pyrene <0,002 µg/l
below limit of quantification
 10 ng/l
< 20 % *
Median
Boron 0,07 mg/l 1 mg/l
7 %
Median
Bromate <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Cadmium <0,2 µg/l
below limit of quantification
 3 µg/l
< 7 % *
Median
Chromium <5 µg/l
below limit of quantification
 25 µg/l
< 20 % *
Median
Copper <20 µg/l
below limit of quantification
 2 mg/l
< 1 % *
Median
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
Fluoride <0,2 mg/l
below limit of quantification
 1.5 mg/l
< 13 % *
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Mercury <0,1 µg/l
below limit of quantification
 1 µg/l
< 10 % *
Median
Nickel <1 µg/l
below limit of quantification
 20 µg/l
< 5 % *
Median
Nitrate 8,7 mg/l 50 mg/l
17 %
Median
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Median
Pesticides n.n. µg/l
not detectable
 0.1 µg/l — Median
Pesticides — Total n.n. µg/l
not detectable
 0.5 µg/l — Median
Polycyclic aromatic hydrocarbons n.n. µg/l
not detectable
 0.1 µg/l — Median
Selenium <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Tetrachloroethene and Trichloroethene (sum) <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Trihalomethanes — Total <1 µg/l
below limit of quantification
 50 µg/l
< 2 % *
Median
Uranium <0,5 µg/l
below limit of quantification
 10 µg/l
< 5 % *
Median

* 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 (13)

Indicator parameters – Mülheim-Styrum-Ost, Mülheim-Styrum-West
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <20 µg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Ammonium <0,04 mg/l
below limit of quantification
 0.5 mg/l
< 8 % *
Median
Chloride 67 mg/l 250 mg/l
27 %
Median
Colour <0,05 1/m
below limit of quantification
 0.5 m⁻¹ — Median
Conductivity (25 °C) 590 µS/cm 2,790 µS/cm — Median
Iron <0,02 mg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
pH 7,78 6,5–9,5 — Median
Sodium 55,8 mg/l 200 mg/l
28 %
Median
Sulphate 47 mg/l 250 mg/l
19 %
Median
Temperature 14,8 °C — — Median
Total organic carbon (TOC) 0,5 mg/l ohne anormale Veränderung — Median
Turbidity <0,1 NTU
below limit of quantification
 1 NTU — Median

* 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 (9)

Further parameters – Mülheim-Styrum-Ost, Mülheim-Styrum-West
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 2,60 mmol/l — — Median
Calcium 43,6 mg/l — — Median
Carbonate hardness 7,3 °dH — — Median
Hardness range (WRMG) weich — — Median
Magnesium 8,3 mg/l — — Median
Phosphate <0,5 mg/l
below limit of quantification
 — — Median
Potassium 5,0 mg/l — — Median
Sum of alkaline earth metals 1,43 mmol/l — — Median
Total hardness 8,0 °dH — — Median

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.rww.de/fileadmin/assets/pdf/twa_bot_mh_med.pdf · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Mülheim-Styrum-Ost (Versorgungsbereich: Mülheim-Mintard)

RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH

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

Water hardness
8.6 °dH
Hardness range mittel
Key values Mülheim-Styrum-Ost (Versorgungsbereich: Mülheim-Mintard)
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 9,5 mg/l 50 mg/l
19 %
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Sulphate 46 mg/l 250 mg/l
18 %
Median
Sodium 50,1 mg/l 200 mg/l
25 %
Median

* 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 (46 — most recent value per parameter)

Chemical parameters (24)

Chemical parameters – Mülheim-Styrum-Ost (Versorgungsbereich: Mülheim-Mintard)
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,3 µg/l
below limit of quantification
 3 µg/l
< 10 % *
Median
Antimony <1 µg/l
below limit of quantification
 5 µg/l
< 20 % *
Median
Arsenic <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Benzene <0,2 µg/l
below limit of quantification
 1 µg/l
< 20 % *
Median
Benzo(a)pyrene <0,002 µg/l
below limit of quantification
 10 ng/l
< 20 % *
Median
Boron 0,07 mg/l 1 mg/l
7 %
Median
Bromate <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Cadmium <0,2 µg/l
below limit of quantification
 3 µg/l
< 7 % *
Median
Chromium <5 µg/l
below limit of quantification
 25 µg/l
< 20 % *
Median
Copper <20 µg/l
below limit of quantification
 2 mg/l
< 1 % *
Median
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
Fluoride <0,2 mg/l
below limit of quantification
 1.5 mg/l
< 13 % *
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Mercury <0,1 µg/l
below limit of quantification
 1 µg/l
< 10 % *
Median
Nickel <1 µg/l
below limit of quantification
 20 µg/l
< 5 % *
Median
Nitrate 9,5 mg/l 50 mg/l
19 %
Median
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Median
Pesticides n.n. µg/l
not detectable
 0.1 µg/l — Median
Pesticides — Total n.n. µg/l
not detectable
 0.5 µg/l — Median
Polycyclic aromatic hydrocarbons n.n. µg/l
not detectable
 0.1 µg/l — Median
Selenium <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Tetrachloroethene and Trichloroethene (sum) <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Trihalomethanes — Total <1 µg/l
below limit of quantification
 50 µg/l
< 2 % *
Median
Uranium <0,5 µg/l
below limit of quantification
 10 µg/l
< 5 % *
Median

* 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 (13)

Indicator parameters – Mülheim-Styrum-Ost (Versorgungsbereich: Mülheim-Mintard)
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <20 µg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Ammonium <0,04 mg/l
below limit of quantification
 0.5 mg/l
< 8 % *
Median
Chloride 62 mg/l 250 mg/l
25 %
Median
Colour <0,05 1/m
below limit of quantification
 0.5 m⁻¹ — Median
Conductivity (25 °C) 592 µS/cm 2,790 µS/cm — Median
Iron <0,02 mg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
pH 7,77 6,5–9,5 — Median
Sodium 50,1 mg/l 200 mg/l
25 %
Median
Sulphate 46 mg/l 250 mg/l
18 %
Median
Temperature 14,5 °C — — Median
Total organic carbon (TOC) 0,7 mg/l ohne anormale Veränderung — Median
Turbidity <0,1 NTU
below limit of quantification
 1 NTU — Median

* 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 (9)

Further parameters – Mülheim-Styrum-Ost (Versorgungsbereich: Mülheim-Mintard)
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 2,87 mmol/l — — Median
Calcium 47,9 mg/l — — Median
Carbonate hardness 8,0 °dH — — Median
Hardness range (WRMG) mittel — — Median
Magnesium 8,4 mg/l — — Median
Phosphate <0,5 mg/l
below limit of quantification
 — — Median
Potassium 4,8 mg/l — — Median
Sum of alkaline earth metals 1,54 mmol/l — — Median
Total hardness 8,6 °dH — — Median

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.rww.de/fileadmin/assets/pdf/twa_mh-mintard_med.pdf · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Reinwasser neues Wasserwerk WW Offlum (Lokalisation: Reinwasser WW Offlum)

RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH

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 12/03/2025. 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
13.8 °dH
Hardness range medium
Key values Reinwasser neues Wasserwerk WW Offlum (Lokalisation: Reinwasser WW Offlum)
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 6,87 mg/l 50 mg/l
14 %
Single value
Lead <0,0010 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Single value
Sulphate 69,4 mg/l 250 mg/l
28 %
Single value
Sodium 19,3 mg/l 200 mg/l
10 %
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 (87 — most recent value per parameter)

Microbiology (1)

Microbiology – Reinwasser neues Wasserwerk WW Offlum (Lokalisation: Reinwasser WW Offlum)
Parameter Value Parametric value Share of the parametric value Reference
Intestinal enterococci 0 KBE/100ml 0/100 ml — Single value

Chemical parameters (60)

Chemical parameters – Reinwasser neues Wasserwerk WW Offlum (Lokalisation: Reinwasser WW Offlum)
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,0010 mg/l
below limit of quantification
 3 µg/l
< 33 % *
Single value
2,4-D <0,00003 mg/l
below limit of quantification
 — — Single value
Antimony <0,0015 mg/l
below limit of quantification
 5 µg/l
< 30 % *
Single value
Arsenic <0,0025 mg/l
below limit of quantification
 10 µg/l
< 25 % *
Single value
Atrazine <0,00003 mg/l
below limit of quantification
 — — Single value
Bentazone <0,00003 mg/l
below limit of quantification
 — — Single value
Benzene <0,0003 mg/l
below limit of quantification
 1 µg/l
< 30 % *
Single value
Benzo(a)pyrene <0,000003 mg/l
below limit of quantification
 10 ng/l
< 30 % *
Single value
Benzo(b)fluoranthene <0,000007 mg/l
below limit of quantification
 — — Single value
Benzo(ghi)perylene <0,000007 mg/l
below limit of quantification
 — — Single value
Benzo(k)fluoranthene <0,000007 mg/l
below limit of quantification
 — — Single value
Boron 0,053 mg/l 1 mg/l
5 %
Single value
Bromacil <0,00003 mg/l
below limit of quantification
 — — Single value
Bromate <0,0025 mg/l
below limit of quantification
 10 µg/l
< 25 % *
Single value
Bromoxynil <0,00003 mg/l
below limit of quantification
 — — Single value
Cadmium <0,0003 mg/l
below limit of quantification
 3 µg/l
< 10 % *
Single value
Carbetamide <0,00003 mg/l
below limit of quantification
 — — Single value
Chloridazon <0,00003 mg/l
below limit of quantification
 — — Single value
Chlorotoluron <0,00003 mg/l
below limit of quantification
 — — Single value
Chromium <0,0005 mg/l
below limit of quantification
 25 µg/l
< 2 % *
Single value
Clopyralid <0,00003 mg/l
below limit of quantification
 — — Single value
Copper <0,0500 mg/l
below limit of quantification
 2 mg/l
< 3 % *
Single value
Cyanide <0,0020 mg/l
below limit of quantification
 50 µg/l
< 4 % *
Single value
Desethylatrazine <0,00003 mg/l
below limit of quantification
 — — Single value
Desethylterbuthylazine <0,00003 mg/l
below limit of quantification
 — — Single value
Desisopropylatrazine <0,00003 mg/l
below limit of quantification
 — — Single value
Dicamba <0,00003 mg/l
below limit of quantification
 — — Single value
Dichlorprop <0,00003 mg/l
below limit of quantification
 — — Single value
Diflufenican <0,00003 mg/l
below limit of quantification
 — — Single value
Dimefuron <0,00003 mg/l
below limit of quantification
 — — Single value
Diuron <0,00003 mg/l
below limit of quantification
 — — Single value
Ethidimuron <0,00003 mg/l
below limit of quantification
 — — Single value
Flufenacet <0,00003 mg/l
below limit of quantification
 — — Single value
Fluoride 0,107 mg/l 1.5 mg/l
7 %
Single value
Hexazinone <0,00003 mg/l
below limit of quantification
 — — Single value
Indeno(1,2,3-cd)pyrene <0,000007 mg/l
below limit of quantification
 — — Single value
Isoproturon <0,00003 mg/l
below limit of quantification
 — — Single value
Lead <0,0010 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Single value
MCPA <0,00003 mg/l
below limit of quantification
 — — Single value
Mecoprop <0,00003 mg/l
below limit of quantification
 — — Single value
Metamitron <0,00003 mg/l
below limit of quantification
 — — Single value
Metazachlor <0,00003 mg/l
below limit of quantification
 — — Single value
Methabenzthiazuron <0,00003 mg/l
below limit of quantification
 — — Single value
Metolachlor <0,00003 mg/l
below limit of quantification
 — — Single value
Metribuzin <0,00003 mg/l
below limit of quantification
 — — Single value
Nickel <0,0010 mg/l
below limit of quantification
 20 µg/l
< 5 % *
Single value
Nitrate 6,87 mg/l 50 mg/l
14 %
Single value
Nitrite <0,0300 mg/l
below limit of quantification
 0.5 mg/l
< 6 % *
Single value
Pendimethalin <0,00003 mg/l
below limit of quantification
 — — Single value
Pesticides — Total <0,00003 mg/l
below limit of quantification
 0.5 µg/l
< 6 % *
Single value
Polycyclic aromatic hydrocarbons <0,00002 mg/l
below limit of quantification
 0.1 µg/l
< 20 % *
Single value
Prosulfocarb <0,00003 mg/l
below limit of quantification
 — — Single value
Quinmerac <0,00003 mg/l
below limit of quantification
 — — Single value
Selenium 0,0015 mg/l 10 µg/l
15 %
Single value
Simazine <0,00003 mg/l
below limit of quantification
 — — Single value
Terbuthylazine <0,00003 mg/l
below limit of quantification
 — — Single value
Tetrachloroethene <0,0015 mg/l
below limit of quantification
 — — Single value
Trichloroethene <0,0015 mg/l
below limit of quantification
 — — Single value
Trihalomethanes — Total 0,000 mg/l 50 µg/l
0 %
Single value
Uranium 0,0011 mg/l 10 µg/l
11 %
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.

Indicator parameters (16)

Indicator parameters – Reinwasser neues Wasserwerk WW Offlum (Lokalisation: Reinwasser WW Offlum)
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <0,0400 mg/l
below limit of quantification
 0.2 mg/l
< 20 % *
Single value
Ammonium <0,1000 mg/l
below limit of quantification
 0.5 mg/l
< 20 % *
Single value
Calcite dissolution capacity 0 mg/l 5 mg/l CaCO3 — Single value
Chloride 28,7 mg/l 250 mg/l
11 %
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
Conductivity (25 °C) 601 µS/cm 2,790 µS/cm — Single value
Iron <0,0400 mg/l
below limit of quantification
 0.2 mg/l
< 20 % *
Single value
Manganese <0,0300 mg/l
below limit of quantification
 50 µg/l
< 60 % *
Single value
Odour geruchlos für den Verbraucher annehmbar — Single value
Oxidisability 1,93 mg/l O2 5 mg/l O2 — Single value
Sodium 19,3 mg/l 200 mg/l
10 %
Single value
Sulphate 69,4 mg/l 250 mg/l
28 %
Single value
Taste ohne für den Verbraucher annehmbar — Single value
Total organic carbon (TOC) 4,42 mg/l ohne anormale Veränderung — Single value
Turbidity <0,10 FTU
below limit of quantification
 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 (10)

Further parameters – Reinwasser neues Wasserwerk WW Offlum (Lokalisation: Reinwasser WW Offlum)
Parameter Value Parametric value Share of the parametric value Reference
AOX (adsorbable organically bound halogens) <0,01 mg/l
below limit of quantification
 — — Single value
Calcite precipitation capacity 6,45 mg/l — — Single value
Calcium 90 mg/l — — Single value
Carbonate hardness 10,6 °dH — — Single value
Dissolved organic carbon (DOC) 3,45 mg/l — — Single value
Hydrogen carbonate 230 mg/l — — Single value
Magnesium 5,20 mg/l — — Single value
Potassium 7,0 mg/l — — Single value
Silicate / silicic acid 7,78 mg/l — — Single value
Total hardness 13,8 °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.rww.de/fileadmin/assets/pdf/trinkwasseranalyse_wettringen__nurBilkRothenbergeHaddorf.pdf · 17.03.2025 · Probenahme 03.02.2025 (Prüfende: 12.03.2025) · retrieved on 08/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Reken-Melchenberg (Versorgungsbereiche: Reken, Gescher-Hochmoor, Velen (ohne Velen-Ramsdorf))

RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH

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

Water hardness
3.8 °dH
Hardness range weich
Key values Reken-Melchenberg (Versorgungsbereiche: Reken, Gescher-Hochmoor, Velen (ohne Velen-Ramsdorf))
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 30,7 mg/l 50 mg/l
61 %
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Sulphate 8 mg/l 250 mg/l
3 %
Median
Sodium 36,1 mg/l 200 mg/l
18 %
Median

* 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 (46 — most recent value per parameter)

Chemical parameters (24)

Chemical parameters – Reken-Melchenberg (Versorgungsbereiche: Reken, Gescher-Hochmoor, Velen (ohne Velen-Ramsdorf))
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,3 µg/l
below limit of quantification
 3 µg/l
< 10 % *
Median
Antimony <1 µg/l
below limit of quantification
 5 µg/l
< 20 % *
Median
Arsenic <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Benzene <0,2 µg/l
below limit of quantification
 1 µg/l
< 20 % *
Median
Benzo(a)pyrene <0,002 µg/l
below limit of quantification
 10 ng/l
< 20 % *
Median
Boron <0,05 mg/l
below limit of quantification
 1 mg/l
< 5 % *
Median
Bromate <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Cadmium <0,2 µg/l
below limit of quantification
 3 µg/l
< 7 % *
Median
Chromium <5 µg/l
below limit of quantification
 25 µg/l
< 20 % *
Median
Copper <20 µg/l
below limit of quantification
 2 mg/l
< 1 % *
Median
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
Fluoride <0,2 mg/l
below limit of quantification
 1.5 mg/l
< 13 % *
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Mercury <0,1 µg/l
below limit of quantification
 1 µg/l
< 10 % *
Median
Nickel 3 µg/l 20 µg/l
15 %
Median
Nitrate 30,7 mg/l 50 mg/l
61 %
Median
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Median
Pesticides n.n. µg/l
not detectable
 0.1 µg/l — Median
Pesticides — Total n.n. µg/l
not detectable
 0.5 µg/l — Median
Polycyclic aromatic hydrocarbons n.n. µg/l
not detectable
 0.1 µg/l — Median
Selenium <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Tetrachloroethene and Trichloroethene (sum) <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Trihalomethanes — Total <1 µg/l
below limit of quantification
 50 µg/l
< 2 % *
Median
Uranium <0,5 µg/l
below limit of quantification
 10 µg/l
< 5 % *
Median

* 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 (13)

Indicator parameters – Reken-Melchenberg (Versorgungsbereiche: Reken, Gescher-Hochmoor, Velen (ohne Velen-Ramsdorf))
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <20 µg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Ammonium <0,04 mg/l
below limit of quantification
 0.5 mg/l
< 8 % *
Median
Chloride 18 mg/l 250 mg/l
7 %
Median
Colour <0,05 1/m
below limit of quantification
 0.5 m⁻¹ — Median
Conductivity (25 °C) 313 µS/cm 2,790 µS/cm — Median
Iron <0,02 mg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
pH 8,30 6,5–9,5 — Median
Sodium 36,1 mg/l 200 mg/l
18 %
Median
Sulphate 8 mg/l 250 mg/l
3 %
Median
Temperature 10,8 °C — — Median
Total organic carbon (TOC) <0,5 mg/l
below limit of quantification
 ohne anormale Veränderung — Median
Turbidity <0,1 NTU
below limit of quantification
 1 NTU — Median

* 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 (9)

Further parameters – Reken-Melchenberg (Versorgungsbereiche: Reken, Gescher-Hochmoor, Velen (ohne Velen-Ramsdorf))
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 1,86 mmol/l — — Median
Calcium 23,5 mg/l — — Median
Carbonate hardness 5,2 °dH — — Median
Hardness range (WRMG) weich — — Median
Magnesium 2,3 mg/l — — Median
Phosphate 1,6 mg/l — — Median
Potassium 1,8 mg/l — — Median
Sum of alkaline earth metals 0,68 mmol/l — — Median
Total hardness 3,8 °dH — — Median

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.rww.de/fileadmin/assets/pdf/twa_rek_gesch_vel_med.pdf · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Velen-Tannenbültenberg, Reken-Melchenberg; Versorgungsbereiche: Velen, Gescher-Hochmoor, Borken-Weseke und -Burlo

RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH

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

Water hardness
3.9 °dH
Hardness range weich
Key values Velen-Tannenbültenberg, Reken-Melchenberg; Versorgungsbereiche: Velen, Gescher-Hochmoor, Borken-Weseke und -Burlo
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 29,7 mg/l 50 mg/l
59 %
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Sulphate 10 mg/l 250 mg/l
4 %
Median
Sodium 34,6 mg/l 200 mg/l
17 %
Median

* 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 (46 — most recent value per parameter)

Chemical parameters (24)

Chemical parameters – Velen-Tannenbültenberg, Reken-Melchenberg; Versorgungsbereiche: Velen, Gescher-Hochmoor, Borken-Weseke und -Burlo
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,3 µg/l
below limit of quantification
 3 µg/l
< 10 % *
Median
Antimony <1 µg/l
below limit of quantification
 5 µg/l
< 20 % *
Median
Arsenic <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Benzene <0,2 µg/l
below limit of quantification
 1 µg/l
< 20 % *
Median
Benzo(a)pyrene <0,002 µg/l
below limit of quantification
 10 ng/l
< 20 % *
Median
Boron <0,05 mg/l
below limit of quantification
 1 mg/l
< 5 % *
Median
Bromate <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Cadmium <0,2 µg/l
below limit of quantification
 3 µg/l
< 7 % *
Median
Chromium <5 µg/l
below limit of quantification
 25 µg/l
< 20 % *
Median
Copper <20 µg/l
below limit of quantification
 2 mg/l
< 1 % *
Median
Cyanide <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
Fluoride <0,2 mg/l
below limit of quantification
 1.5 mg/l
< 13 % *
Median
Lead <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Mercury <0,1 µg/l
below limit of quantification
 1 µg/l
< 10 % *
Median
Nickel 2 µg/l 20 µg/l
10 %
Median
Nitrate 29,7 mg/l 50 mg/l
59 %
Median
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Median
Pesticides n.n. µg/l
not detectable
 0.1 µg/l — Median
Pesticides — Total n.n. µg/l
not detectable
 0.5 µg/l — Median
Polycyclic aromatic hydrocarbons n.n. µg/l
not detectable
 0.1 µg/l — Median
Selenium <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Tetrachloroethene and Trichloroethene (sum) <1 µg/l
below limit of quantification
 10 µg/l
< 10 % *
Median
Trihalomethanes — Total <1 µg/l
below limit of quantification
 50 µg/l
< 2 % *
Median
Uranium <0,5 µg/l
below limit of quantification
 10 µg/l
< 5 % *
Median

* 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 (13)

Indicator parameters – Velen-Tannenbültenberg, Reken-Melchenberg; Versorgungsbereiche: Velen, Gescher-Hochmoor, Borken-Weseke und -Burlo
Parameter Value Parametric value Share of the parametric value Reference
Aluminium <20 µg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Ammonium <0,04 mg/l
below limit of quantification
 0.5 mg/l
< 8 % *
Median
Chloride 17 mg/l 250 mg/l
7 %
Median
Colour <0,05 1/m
below limit of quantification
 0.5 m⁻¹ — Median
Conductivity (25 °C) 316 µS/cm 2,790 µS/cm — Median
Iron <0,02 mg/l
below limit of quantification
 0.2 mg/l
< 10 % *
Median
Manganese <0,005 mg/l
below limit of quantification
 50 µg/l
< 10 % *
Median
pH 8,28 6,5–9,5 — Median
Sodium 34,6 mg/l 200 mg/l
17 %
Median
Sulphate 10 mg/l 250 mg/l
4 %
Median
Temperature 11,0 °C — — Median
Total organic carbon (TOC) <0,5 mg/l
below limit of quantification
 ohne anormale Veränderung — Median
Turbidity <0,1 NTU
below limit of quantification
 1 NTU — Median

* 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 (9)

Further parameters – Velen-Tannenbültenberg, Reken-Melchenberg; Versorgungsbereiche: Velen, Gescher-Hochmoor, Borken-Weseke und -Burlo
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 1,96 mmol/l — — Median
Calcium 24,1 mg/l — — Median
Carbonate hardness 5,5 °dH — — Median
Hardness range (WRMG) weich — — Median
Magnesium 2,4 mg/l — — Median
Phosphate 1,7 mg/l — — Median
Potassium 1,9 mg/l — — Median
Sum of alkaline earth metals 0,70 mmol/l — — Median
Total hardness 3,9 °dH — — Median

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.rww.de/fileadmin/assets/pdf/twa_ram-wes-bur_med.pdf · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)

Gelsenwasser

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

Water hardness
7.7 °dH
Hardness range weich
Key values Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 9,2 mg/l 50 mg/l
18 %
Mean
Lead <0,0005 mg/l
below limit of quantification
 10 µg/l
< 5 % *
Mean
Escherichia coli (E. coli) 0 KBE/100 ml 0/100 ml — Mean
Sulphate 42 mg/l 250 mg/l
17 %
Mean
Sodium 41 mg/l 200 mg/l
21 %
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 (59 — most recent value per parameter)

Microbiology (2)

Microbiology – Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter Value Parametric value Share of the parametric value Reference
Escherichia coli (E. coli) 0 KBE/100 ml 0/100 ml — Mean
Intestinal enterococci 0 KBE/100 ml 0/100 ml — Mean

Chemical parameters (26)

Chemical parameters – Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,05 µg/l
below limit of quantification
 3 µg/l
< 2 % *
Mean
Antimony <0,001 mg/l
below limit of quantification
 5 µg/l
< 20 % *
Mean
Arsenic <0,0005 mg/l
below limit of quantification
 10 µg/l
< 5 % *
Mean
Benzene <0,05 µg/l
below limit of quantification
 1 µg/l
< 5 % *
Mean
Benzo(a)pyrene <0,0025 µg/l
below limit of quantification
 10 ng/l
< 25 % *
Mean
Bisphenol A <0,015 µg/l
below limit of quantification
 2.5 µg/l
< 0.6 % *
Mean
Boron 0,07 mg/l 1 mg/l
7 %
Mean
Bromate <0,0030 mg/l
below limit of quantification
 10 µg/l
< 30 % *
Mean
Cadmium <0,0003 mg/l
below limit of quantification
 3 µg/l
< 10 % *
Mean
Chlorate <0,003 mg/l
below limit of quantification
 70 µg/l
< 4 % *
Mean
Chlorite <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Chromium <0,0004 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 0,11 mg/l 1.5 mg/l
7 %
Mean
Lead <0,0005 mg/l
below limit of quantification
 10 µg/l
< 5 % *
Mean
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Nickel <0,002 mg/l
below limit of quantification
 20 µg/l
< 10 % *
Mean
Nitrate 9,2 mg/l 50 mg/l
18 %
Mean
Nitrite 0,01 mg/l 0.5 mg/l
2 %
Mean
Pesticides — Total <0,025 µg/l
below limit of quantification
 0.5 µg/l
< 5 % *
Mean
Polycyclic aromatic hydrocarbons <0,005 µg/l
below limit of quantification
 0.1 µg/l
< 5 % *
Mean
Selenium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Tetrachloroethene and Trichloroethene (sum) <0,05 µg/l
below limit of quantification
 10 µg/l
< 0.5 % *
Mean
Trihalomethanes — Total <0,050 µg/l
below limit of quantification
 50 µg/l
< 0.1 % *
Mean
Uranium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
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 (18)

Indicator parameters – Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
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 <0,05 mg/l
below limit of quantification
 0.5 mg/l
< 10 % *
Mean
Calcite dissolution capacity 1 mg/l 5 mg/l CaCO3 — Mean
Chloride 55 mg/l 250 mg/l
22 %
Mean
Clostridium perfringens (including spores) 0 KBE/100 ml 0/100 ml — Mean
Coliform bacteria 0 KBE/100 ml 0/100 ml — Mean
Colony count 22 °C 0 KBE/ml ohne anormale Veränderung — Mean
Colony count 36 °C 0 KBE/ml ohne anormale Veränderung — Mean
Colour <0,10 1/m
below limit of quantification
 0.5 m⁻¹ — Mean
Conductivity (25 °C) 491 µS/cm 2,790 µS/cm — Mean
Iron <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Manganese <0,002 mg/l
below limit of quantification
 50 µg/l
< 4 % *
Mean
pH 7,9 6,5–9,5 — Mean
Sodium 41 mg/l 200 mg/l
21 %
Mean
Sulphate 42 mg/l 250 mg/l
17 %
Mean
Temperature 14,1 °C — — Mean
Total organic carbon (TOC) 0,8 mg/l ohne anormale Veränderung — Mean
Turbidity <0,05 FNU
below limit of quantification
 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 (2)

Radiology – Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter Value Parametric value Share of the parametric value Reference
Indicative dose <0,1 mSv/a
below limit of quantification
 0.1 mSv/a — Mean
Radon-222 <10 Bq/l
below limit of quantification
 100 Bq/l — Mean

Further parameters (11)

Further parameters – Verbundwasserwerk Essen; Entnahmestelle: Trinkwasser Essen nach UV Ltg. Überruhr, WAA 2 (00-0350)
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 2,2 mmol/l — — Mean
Base capacity to pH 8.2 0,06 mmol/l — — Mean
Calcium 42 mg/l — — Mean
Carbonate hardness 6,2 °dH — — Mean
Hardness range (WRMG) weich — — Mean
Magnesium 7,9 mg/l — — Mean
Oxygen 10,5 mg/l — — Mean
Phosphate 0,23 mg/l — — Mean
Potassium 4,4 mg/l — — Mean
Silicate / silicic acid 4,9 mg/l — — Mean
Total hardness 7,7 °dH — — 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.gelsenwasser.de/fileadmin/twa/downloads/gelsenwasser/trinkwasseranalyse_essen.pdf · 2025 · retrieved on 11/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Versorgungsgebiet der Stadtwerke Essen AG (Herkunft des Trinkwassers: Verbundwasserwerk Essen, Wassergewinnung Essen GmbH)

Gelsenwasser

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

Water hardness
Hardness range 1,38
Key values Versorgungsgebiet der Stadtwerke Essen AG (Herkunft des Trinkwassers: Verbundwasserwerk Essen, Wassergewinnung Essen GmbH)
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 9 mg/l 50 mg/l
18 %
Median
Sulphate 42 mg/l 250 mg/l
17 %
Median
Sodium 41 mg/l 200 mg/l
21 %
Median
Show all recorded parameters (17 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – Versorgungsgebiet der Stadtwerke Essen AG (Herkunft des Trinkwassers: Verbundwasserwerk Essen, Wassergewinnung Essen GmbH)
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 9 mg/l 50 mg/l
18 %
Median

Indicator parameters (8)

Indicator parameters – Versorgungsgebiet der Stadtwerke Essen AG (Herkunft des Trinkwassers: Verbundwasserwerk Essen, Wassergewinnung Essen GmbH)
Parameter Value Parametric value Share of the parametric value Reference
Calcite dissolution capacity 0,8 mg/l 5 mg/l CaCO3 — Median
Chloride 55 mg/l 250 mg/l
22 %
Median
Conductivity (25 °C) 491 µS/cm 2,790 µS/cm — Median
pH 7,90 6,5–9,5 — Median
Sodium 41 mg/l 200 mg/l
21 %
Median
Sulphate 42 mg/l 250 mg/l
17 %
Median
Temperature 14,1 °C — — Median
Total organic carbon (TOC) 0,8 mg/l ohne anormale Veränderung — Median

Further parameters (8)

Further parameters – Versorgungsgebiet der Stadtwerke Essen AG (Herkunft des Trinkwassers: Verbundwasserwerk Essen, Wassergewinnung Essen GmbH)
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 2,20 mmol/l — — Median
Base capacity to pH 8.2 0,06 mmol/l — — Median
Calcium 42 mg/l — — Median
Hardness range (WRMG) 1,38 mmol/l — — Median
Magnesium 7,9 mg/l — — Median
Oxygen 10,5 mg/l — — Median
Potassium 4,4 mg/l — — Median
Silicate / silicic acid 2,3 mg/l — — Median

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.gelsenwasser.de/fileadmin/Gelsenwasser/80_footer/8.1-tw_parameter/essen_inst.pdf · Median 2025 (Jahresmittelwert) · retrieved on 13/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Wasserwerk Bucholtwelmen

Gelsenwasser

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

Water hardness
14.7 °dH
Hardness range hart
Key values Wasserwerk Bucholtwelmen
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 15 mg/l 50 mg/l
30 %
Mean
Lead <0,0005 mg/l
below limit of quantification
 10 µg/l
< 5 % *
Mean
Escherichia coli (E. coli) 0 KBE/100 ml 0/100 ml — Mean
Sulphate 83 mg/l 250 mg/l
33 %
Mean
Sodium 15 mg/l 200 mg/l
8 %
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 (57 — most recent value per parameter)

Microbiology (2)

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

Chemical parameters (24)

Chemical parameters – Wasserwerk Bucholtwelmen
Parameter Value Parametric value Share of the parametric value Reference
1,2-dichloroethane <0,05 µg/l
below limit of quantification
 3 µg/l
< 2 % *
Mean
Antimony <0,001 mg/l
below limit of quantification
 5 µg/l
< 20 % *
Mean
Arsenic <0,0005 mg/l
below limit of quantification
 10 µg/l
< 5 % *
Mean
Benzene <0,05 µg/l
below limit of quantification
 1 µg/l
< 5 % *
Mean
Benzo(a)pyrene <0,0025 µg/l
below limit of quantification
 10 ng/l
< 25 % *
Mean
Bisphenol A <0,015 µg/l
below limit of quantification
 2.5 µg/l
< 0.6 % *
Mean
Boron 0,05 mg/l 1 mg/l
5 %
Mean
Bromate <0,0030 mg/l
below limit of quantification
 10 µg/l
< 30 % *
Mean
Cadmium <0,0003 mg/l
below limit of quantification
 3 µg/l
< 10 % *
Mean
Chromium <0,0004 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 0,1 mg/l 1.5 mg/l
7 %
Mean
Lead <0,0005 mg/l
below limit of quantification
 10 µg/l
< 5 % *
Mean
Mercury <0,0001 mg/l
below limit of quantification
 1 µg/l
< 10 % *
Mean
Nickel <0,002 mg/l
below limit of quantification
 20 µg/l
< 10 % *
Mean
Nitrate 15 mg/l 50 mg/l
30 %
Mean
Nitrite <0,01 mg/l
below limit of quantification
 0.5 mg/l
< 2 % *
Mean
Pesticides — Total <0,025 µg/l
below limit of quantification
 0.5 µg/l
< 5 % *
Mean
Polycyclic aromatic hydrocarbons <0,005 µg/l
below limit of quantification
 0.1 µg/l
< 5 % *
Mean
Selenium <0,001 mg/l
below limit of quantification
 10 µg/l
< 10 % *
Mean
Tetrachloroethene and Trichloroethene (sum) 0,06 µg/l 10 µg/l
0.6 %
Mean
Trihalomethanes — Total <0,050 µg/l
below limit of quantification
 50 µg/l
< 0.1 % *
Mean
Uranium 0,001 mg/l 10 µg/l
10 %
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 (18)

Indicator parameters – Wasserwerk Bucholtwelmen
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 <0,05 mg/l
below limit of quantification
 0.5 mg/l
< 10 % *
Mean
Calcite dissolution capacity 2 mg/l 5 mg/l CaCO3 — Mean
Chloride 27 mg/l 250 mg/l
11 %
Mean
Clostridium perfringens (including spores) 0 KBE/100 ml 0/100 ml — Mean
Coliform bacteria 0 KBE/100 ml 0/100 ml — Mean
Colony count 22 °C 0 KBE/ml ohne anormale Veränderung — Mean
Colony count 36 °C 0 KBE/ml ohne anormale Veränderung — Mean
Colour 0,1 1/m 0.5 m⁻¹ — Mean
Conductivity (25 °C) 606 µS/cm 2,790 µS/cm — Mean
Iron <0,010 mg/l
below limit of quantification
 0.2 mg/l
< 5 % *
Mean
Manganese <0,002 mg/l
below limit of quantification
 50 µg/l
< 4 % *
Mean
pH 7,42 6,5–9,5 — Mean
Sodium 15 mg/l 200 mg/l
8 %
Mean
Sulphate 83 mg/l 250 mg/l
33 %
Mean
Temperature 11,1 °C — — Mean
Total organic carbon (TOC) 2,1 mg/l ohne anormale Veränderung — Mean
Turbidity 0,05 FNU 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 (2)

Radiology – Wasserwerk Bucholtwelmen
Parameter Value Parametric value Share of the parametric value Reference
Indicative dose <0,1 mSv/a
below limit of quantification
 0.1 mSv/a — Mean
Radon-222 13 Bq/l 100 Bq/l — Mean

Further parameters (11)

Further parameters – Wasserwerk Bucholtwelmen
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 3,45 mmol/l — — Mean
Base capacity to pH 8.2 0,34 mmol/l — — Mean
Calcium 93 mg/l — — Mean
Carbonate hardness 9,7 °dH — — Mean
Hardness range (WRMG) hart — — Mean
Magnesium 7,6 mg/l — — Mean
Oxygen 6,8 mg/l — — Mean
Phosphate 0,06 mg/l — — Mean
Potassium 5,5 mg/l — — Mean
Silicate / silicic acid 12,4 mg/l — — Mean
Total hardness 14,7 °dH — — 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.gelsenwasser.de/fileadmin/twa/downloads/huenxe_voerde/trinkwasseranalyse_bucholtwelmen.pdf · 2025 · retrieved on 13/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Wasserwerk Haltern

Gelsenwasser

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

Water hardness
Hardness range 2,02
Key values Wasserwerk Haltern
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 12 mg/l 50 mg/l
24 %
Median
Sulphate 48 mg/l 250 mg/l
19 %
Median
Sodium 19 mg/l 200 mg/l
9 %
Median
Show all recorded parameters (17 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – Wasserwerk Haltern
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 12 mg/l 50 mg/l
24 %
Median

Indicator parameters (8)

Indicator parameters – Wasserwerk Haltern
Parameter Value Parametric value Share of the parametric value Reference
Calcite dissolution capacity 0,2 mg/l 5 mg/l CaCO3 — Median
Chloride 26 mg/l 250 mg/l
10 %
Median
Conductivity (25 °C) 487 µS/cm 2,790 µS/cm — Median
pH 7,55 6,5–9,5 — Median
Sodium 19 mg/l 200 mg/l
9 %
Median
Sulphate 48 mg/l 250 mg/l
19 %
Median
Temperature 13,3 °C — — Median
Total organic carbon (TOC) 3,0 mg/l ohne anormale Veränderung — Median

Further parameters (8)

Further parameters – Wasserwerk Haltern
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 2,97 mmol/l — — Median
Base capacity to pH 8.2 0,21 mmol/l — — Median
Calcium 73 mg/l — — Median
Hardness range (WRMG) 2,02 mmol/l — — Median
Magnesium 4,8 mg/l — — Median
Oxygen 6,9 mg/l — — Median
Potassium 5,3 mg/l — — Median
Silicate / silicic acid 4,0 mg/l — — Median

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.gelsenwasser.de/fileadmin/Gelsenwasser/80_footer/8.1-tw_parameter/haltern_inst.pdf · 2025 · retrieved on 25/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Wasserwerk Haltern, Gelsenwasser AG

Gelsenwasser

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

Water hardness
Hardness range 2,02
Key values Wasserwerk Haltern, Gelsenwasser AG
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 12 mg/l 50 mg/l
24 %
Median
Sulphate 48 mg/l 250 mg/l
19 %
Median
Sodium 19 mg/l 200 mg/l
9 %
Median
Show all recorded parameters (17 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – Wasserwerk Haltern, Gelsenwasser AG
Parameter Value Parametric value Share of the parametric value Reference
Nitrate 12 mg/l 50 mg/l
24 %
Median

Indicator parameters (8)

Indicator parameters – Wasserwerk Haltern, Gelsenwasser AG
Parameter Value Parametric value Share of the parametric value Reference
Calcite dissolution capacity 0,2 mg/l 5 mg/l CaCO3 — Median
Chloride 26 mg/l 250 mg/l
10 %
Median
Conductivity (25 °C) 487 µS/cm 2,790 µS/cm — Median
pH 7,55 6,5–9,5 — Median
Sodium 19 mg/l 200 mg/l
9 %
Median
Sulphate 48 mg/l 250 mg/l
19 %
Median
Temperature 13,3 °C — — Median
Total organic carbon (TOC) 3,0 mg/l ohne anormale Veränderung — Median

Further parameters (8)

Further parameters – Wasserwerk Haltern, Gelsenwasser AG
Parameter Value Parametric value Share of the parametric value Reference
Acid capacity to pH 4.3 2,97 mmol/l — — Median
Base capacity to pH 8.2 0,21 mmol/l — — Median
Calcium 73 mg/l — — Median
Hardness range (WRMG) 2,02 mmol/l — — Median
Magnesium 4,8 mg/l — — Median
Oxygen 6,9 mg/l — — Median
Potassium 5,3 mg/l — — Median
Silicate / silicic acid 4,0 mg/l — — Median

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.gelsenwasser.de/fileadmin/Gelsenwasser/80_footer/8.1-tw_parameter/haltern_inst.pdf · 2025 · retrieved on 25/07/2026

Postcodes in this zone: 46236 , 46238 , 46240 , 46242 , 46244

Frequently asked questions about drinking water in Bottrop

How hard is the water in Bottrop?
RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH publishes a total hardness of 13.5 °dH for the supply zone Dorsten-Holsterhausen (hardness range mittel). The hardness range is a classification under the German Detergents and Cleaning Products Act (soft below 8,4 °dH, medium 8,4 to 14 °dH, hard above that) and not a quality verdict — it indicates how much calcium and magnesium is dissolved in the water. Basis: Publication by the water supplier, retrieved on 11/07/2026.
How much nitrate is in the drinking water in Bottrop?
RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH publishes a nitrate value of 9,6 mg/l for the supply zone Dorsten-Holsterhausen. The statutory parametric value is 50 mg/l; the measured value represents 19 % of the parametric value. Basis: Publication by the water supplier, retrieved on 11/07/2026.
Who supplies the drinking water in Bottrop?
RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH. The values shown here come from the supply zone Dorsten-Holsterhausen 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.