Drinking water in Hennef
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
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)| 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)
| 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)
| 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)
| 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.
Postcodes in this zone: 53773
Show 11 more supply zones
Alle Versorgungsbereiche
WahnbachtalsperrenverbandAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean · Alle Versorgungsbereiche |
* 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 (17 — most recent value per parameter)
Microbiology (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Intestinal enterococci | 0 /100ml | 0/100 ml | — | Mean · Alle Versorgungsbereiche |
Chemical parameters (10)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Antimony | < 0,001 mg/l below limit of quantification | 5 µg/l | < 20 % * | Mean · Alle Versorgungsbereiche |
| Arsenic | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean · Alle Versorgungsbereiche |
| Benzo(a)pyrene | < 0,000005 mg/l below limit of quantification | 10 ng/l | < 50 % * | Mean · Alle Versorgungsbereiche |
| Cadmium | < 0,0003 mg/l below limit of quantification | 3 µg/l | < 10 % * | Mean · Alle Versorgungsbereiche |
| Chlorite | 0,12 ± 0,03 mg/l | 0.2 mg/l | — | Mean · Alle Versorgungsbereiche |
| Copper | < 0,010 mg/l below limit of quantification | 2 mg/l | < 0.5 % * | Mean · Alle Versorgungsbereiche |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean · Alle Versorgungsbereiche |
| Mercury | < 0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Mean · Alle Versorgungsbereiche |
| Nickel | < 0,005 mg/l below limit of quantification | 20 µg/l | < 25 % * | Mean · Alle Versorgungsbereiche |
| Selenium | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean · Alle Versorgungsbereiche |
* 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 (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 0,005 mg/l below limit of quantification | 0.2 mg/l | < 3 % * | Mean · Alle Versorgungsbereiche |
| Coliform bacteria | 0 /100ml | 0/100 ml | — | Mean · Alle Versorgungsbereiche |
| Colony count 22 °C | 0 - 2 /1ml | ohne anormale Veränderung | — | Single value · Alle Versorgungsbereiche |
| Colony count 36 °C | 0 - 1 /1ml | ohne anormale Veränderung | — | Single value · Alle Versorgungsbereiche |
| Iron | < 0,010 mg/l below limit of quantification | 0.2 mg/l | < 5 % * | Mean · Alle Versorgungsbereiche |
| Manganese | < 0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Mean · Alle Versorgungsbereiche |
* 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.
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.
Postcodes in this zone: 53773
Hennef-Kurenbach, Hennef-Liesberg
rhenagAssigned 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 03/01/2024. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 22,2 mg/l | 50 mg/l | 44 % | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Lead | -- mg/l not determined | 10 µg/l | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Sulphate | 40,0 mg/l | 250 mg/l | 16 % | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Sodium | 11,2 mg/l | 200 mg/l | 6 % | Single value · Hennef-Kurenbach, Hennef-Liesberg |
Show all recorded parameters (34 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Intestinal enterococci | 0 /100 ml | 0/100 ml | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
Chemical parameters (10)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Arsenic | -- mg/l not determined | 10 µg/l | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Copper | -- mg/l not determined | 2 mg/l | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Fluoride | 0,11 mg/l | 1.5 mg/l | 7 % | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Lead | -- mg/l not determined | 10 µg/l | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Mercury | <0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Nickel | -- mg/l not determined | 20 µg/l | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Nitrate | 22,2 mg/l | 50 mg/l | 44 % | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Nitrite | -- mg/l not determined | 0.5 mg/l | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Polycyclic aromatic hydrocarbons | 0 mg/l | 0.1 µg/l | 0 % | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Trihalomethanes — Total | 0 mg/l | 50 µg/l | 0 % | Single value · Hennef-Kurenbach, Hennef-Liesberg |
* 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 (15)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | -- mg/l not determined | 0.2 mg/l | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Ammonium | -- mg/l not determined | 0.5 mg/l | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Chloride | 27,0 mg/l | 250 mg/l | 11 % | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Coliform bacteria | 0 /100 ml | 0/100 ml | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Colony count 22 °C | 0 / 1ml | ohne anormale Veränderung | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Colony count 36 °C | 0 / 1ml | ohne anormale Veränderung | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Colour | -- 1/m not determined | 0.5 m⁻¹ | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Iron | -- mg/l not determined | 0.2 mg/l | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Manganese | -- mg/l not determined | 50 µg/l | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| pH | 7,58 | 6,5–9,5 | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Sodium | 11,2 mg/l | 200 mg/l | 6 % | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Sulphate | 40,0 mg/l | 250 mg/l | 16 % | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Temperature | 11,2 °C | — | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Total organic carbon (TOC) | -- mg/l not determined | ohne anormale Veränderung | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Turbidity | < 0,10 FNU below limit of quantification | 1 NTU | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
Further parameters (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 69,4 mg/l | — | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Hardness range (WRMG) | mittel | — | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Magnesium | 11,5 mg/l | — | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Phosphate | -- mg/l not determined | — | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Potassium | 2,7 mg/l | — | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Silicate / silicic acid | -- mg/l not determined | — | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
| Total hardness | 12,4 °dH | — | — | Single value · Hennef-Kurenbach, Hennef-Liesberg |
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.
Postcodes in this zone: 53773
Hochbehälter Scharfenberg
Wasserbeschaffungsverband (WBV) ThomasbergAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
No date is given for these values. The water supplier publishes the analysis without a sampling date and without a report date. When the water was examined is not apparent from the source — we do not add a date and we do not estimate one. What is stated is therefore only when we retrieved the document.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 21,4 mg/l | 50 mg/l | 43 % | Single value · Hochbehälter Scharfenberg |
| Sulphate | 37,6 mg/l | 250 mg/l | 15 % | Single value · Hochbehälter Scharfenberg |
| Sodium | 11,9 mg/l | 200 mg/l | 6 % | Single value · Hochbehälter Scharfenberg |
Show all recorded parameters (11 — most recent value per parameter)
Chemical parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Boron | 0,02 mg/l | 1 mg/l | 2 % | Single value · Hochbehälter Scharfenberg |
| Fluoride | 0,11 mg/l | 1.5 mg/l | 7 % | Single value · Hochbehälter Scharfenberg |
| Nitrate | 21,4 mg/l | 50 mg/l | 43 % | Single value · Hochbehälter Scharfenberg |
| Uranium | 0,0007 mg/l | 10 µg/l | 7 % | Single value · Hochbehälter Scharfenberg |
Indicator parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 26,6 mg/l | 250 mg/l | 11 % | Single value · Hochbehälter Scharfenberg |
| Sodium | 11,9 mg/l | 200 mg/l | 6 % | Single value · Hochbehälter Scharfenberg |
| Sulphate | 37,6 mg/l | 250 mg/l | 15 % | Single value · Hochbehälter Scharfenberg |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 66,0 mg/l | — | — | Single value · Hochbehälter Scharfenberg |
| Magnesium | 11,0 mg/l | — | — | Single value · Hochbehälter Scharfenberg |
| Potassium | 2,7 mg/l | — | — | Single value · Hochbehälter Scharfenberg |
| Total hardness | 11,8 °dH | — | — | Single value · Hochbehälter Scharfenberg |
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.
Postcodes in this zone: 53773
Hochbehälter Tomberg Auslauf (Ort 561)
WahnbachtalsperrenverbandAssigned 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 04/08/2025. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 12 mg/l | 50 mg/l | 24 % | Single value · 04.08.2025 |
| Lead | - mg/l not determined | 10 µg/l | — | Single value · 04.08.2025 |
| Sulphate | 26 mg/l | 250 mg/l | 10 % | Single value · 04.08.2025 |
| Sodium | 11,7 mg/l | 200 mg/l | 6 % | Single value · 04.08.2025 |
Show all recorded parameters (50 — most recent value per parameter)
Chemical parameters (31)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | - mg/l not determined | 3 µg/l | — | Single value · 04.08.2025 |
| Acrylamide | - mg/l not determined | 0.1 µg/l | — | Single value · 04.08.2025 |
| Antimony | - mg/l not determined | 5 µg/l | — | Single value · 04.08.2025 |
| Arsenic | - mg/l not determined | 10 µg/l | — | Single value · 04.08.2025 |
| Benzene | - mg/l not determined | 1 µg/l | — | Single value · 04.08.2025 |
| Benzo(a)pyrene | - mg/l not determined | 10 ng/l | — | Single value · 04.08.2025 |
| Bisphenol A | - mg/l not determined | 2.5 µg/l | — | Single value · 04.08.2025 |
| Bromate | - mg/l not determined | 10 µg/l | — | Single value · 04.08.2025 |
| Cadmium | - mg/l not determined | 3 µg/l | — | Single value · 04.08.2025 |
| Chlorate | - mg/l not determined | 70 µg/l | — | Single value · 04.08.2025 |
| Chlorite | 0,16 mg/l | 0.2 mg/l | 80 % | Single value · 04.08.2025 |
| Chromium | - mg/l not determined | 25 µg/l | — | Single value · 04.08.2025 |
| Copper | - mg/l not determined | 2 mg/l | — | Single value · 04.08.2025 |
| Cyanide | - mg/l not determined | 50 µg/l | — | Single value · 04.08.2025 |
| Desethylterbuthylazine | - mg/l not determined | — | — | Single value · 04.08.2025 |
| Epichlorohydrin | - mg/l not determined | 0.1 µg/l | — | Single value · 04.08.2025 |
| Fluoride | 0,06 mg/l | 1.5 mg/l | 4 % | Single value · 04.08.2025 |
| Lead | - mg/l not determined | 10 µg/l | — | Single value · 04.08.2025 |
| MCPA | - mg/l not determined | — | — | Single value · 04.08.2025 |
| Mercury | - mg/l not determined | 1 µg/l | — | Single value · 04.08.2025 |
| Metolachlor | - mg/l not determined | — | — | Single value · 04.08.2025 |
| Nickel | - mg/l not determined | 20 µg/l | — | Single value · 04.08.2025 |
| Nitrate | 12 mg/l | 50 mg/l | 24 % | Single value · 04.08.2025 |
| Nitrite | <0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Single value · 04.08.2025 |
| Selenium | - mg/l not determined | 10 µg/l | — | Single value · 04.08.2025 |
| Terbuthylazine | - mg/l not determined | — | — | Single value · 04.08.2025 |
| Terbutryn | - mg/l not determined | — | — | Single value · 04.08.2025 |
| Tetrachloromethane | - mg/l not determined | — | — | Single value · 04.08.2025 |
| Trihalomethanes — Total | - mg/l not determined | 50 µg/l | — | Single value · 04.08.2025 |
| Uranium | - mg/l not determined | 10 µg/l | — | Single value · 04.08.2025 |
| Vinyl chloride | - mg/l not determined | 0.5 µg/l | — | Single value · 04.08.2025 |
* 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 (10)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Ammonium | <0,02 mg/l below limit of quantification | 0.5 mg/l | < 4 % * | Single value · 04.08.2025 |
| Chloride | 21 mg/l | 250 mg/l | 8 % | Single value · 04.08.2025 |
| Conductivity (25 °C) | 25,1 mS/m | 2,790 µS/cm | — | Single value · 04.08.2025 |
| Odour | ohne TON | für den Verbraucher annehmbar | — | Single value · 04.08.2025 |
| Sodium | 11,7 mg/l | 200 mg/l | 6 % | Single value · 04.08.2025 |
| Sulphate | 26 mg/l | 250 mg/l | 10 % | Single value · 04.08.2025 |
| Taste | - not determined | für den Verbraucher annehmbar | — | Single value · 04.08.2025 |
| Temperature | 11 °C | — | — | Single value · 04.08.2025 |
| Total organic carbon (TOC) | 0,9 mg/l | ohne anormale Veränderung | — | Single value · 04.08.2025 |
| Turbidity | <0,10 FNU below limit of quantification | 1 NTU | — | Single value · 04.08.2025 |
* 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.
Treatment substances (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorine dioxide | - mg/l not determined | — | — | Single value · 04.08.2025 |
Further parameters (8)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 1,11 mmol/l | — | — | Single value · 04.08.2025 |
| Calcium | 27,3 mg/l | — | — | Single value · 04.08.2025 |
| Magnesium | 5,3 mg/l | — | — | Single value · 04.08.2025 |
| Oxygen | 96 % | — | — | Single value · 04.08.2025 |
| Phosphate | <0,008 mg/l P below limit of quantification | — | — | Single value · 04.08.2025 |
| Potassium | 2,2 mg/l | — | — | Single value · 04.08.2025 |
| Total hardness | 0,9 mmol/l | — | — | Single value · 04.08.2025 |
| Zinc | - mg/l not determined | — | — | Single value · 04.08.2025 |
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.
Postcodes in this zone: 53773
Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 16 ± 3 mg/l | 50 mg/l | — | Mean · Mitte |
| Sulphate | 28 ± 1,8 mg/l | 250 mg/l | — | Mean · Mitte |
| Sodium | 15,3 ± 2,5 mg/l | 200 mg/l | — | Mean · Mitte |
Show all recorded parameters (21 — most recent value per parameter)
Chemical parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Fluoride | < 0,1 mg/l below limit of quantification | 1.5 mg/l | < 7 % * | Mean · Mitte |
| Nitrate | 16 ± 3 mg/l | 50 mg/l | — | Mean · Mitte |
| Nitrite | < 0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean · Mitte |
* 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 (11)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Ammonium | < 0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean · Mitte |
| Chloride | 26 ± 4 mg/l | 250 mg/l | — | Mean · Mitte |
| Colour | 0,01 ± 0,01 m-1 | 0.5 m⁻¹ | — | Mean · Mitte |
| Conductivity (25 °C) | 32 ± 4 mS/m | 2,790 µS/cm | — | Mean · Mitte |
| Odour | ohne | für den Verbraucher annehmbar | — | Single value · Mitte |
| pH | 8,0 ± 0,2 | 6,5–9,5 | — | Mean · Mitte |
| Sodium | 15,3 ± 2,5 mg/l | 200 mg/l | — | Mean · Mitte |
| Sulphate | 28 ± 1,8 mg/l | 250 mg/l | — | Mean · Mitte |
| Taste | erfüllt | für den Verbraucher annehmbar | — | Single value · Mitte |
| Temperature | 10,2 ± 1,3 °C | — | — | Mean · Mitte |
| Turbidity | < 0,1 FNU below limit of quantification | 1 NTU | — | Mean · Mitte |
* 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 (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 33,4 ± 4,5 mg/l | — | — | Mean · Mitte |
| Carbonate hardness | 3,9 ± 0,7 °dH | — | — | Mean · Mitte |
| Magnesium | 6,7 ± 0,8 mg/l | — | — | Mean · Mitte |
| Phosphate | < 0,01 mg/l below limit of quantification | — | — | Mean · Mitte |
| Potassium | 3,0 ± 0,4 mg/l | — | — | Mean · Mitte |
| Silicate / silicic acid | 4,0 ± 0,7 mg/l | — | — | Mean · Mitte |
| Total hardness | 1,11 ± 0,15 mmol/l | — | — | Mean · Mitte |
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.
Postcodes in this zone: 53773
Much
rhenagAssigned 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 03/01/2024. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 12,3 mg/l | 50 mg/l | 25 % | Mean · Much |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean · Much |
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Mean · Much |
| Sulphate | 11,2 mg/l | 250 mg/l | 4 % | Mean · Much |
| Sodium | 5,7 mg/l | 200 mg/l | 3 % | Mean · Much |
* 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 (34 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Mean · Much |
| Intestinal enterococci | 0 /100 ml | 0/100 ml | — | Mean · Much |
Chemical parameters (10)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Arsenic | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean · Much |
| Copper | < 0,005 mg/l below limit of quantification | 2 mg/l | < 0.3 % * | Mean · Much |
| Fluoride | < 0,05 mg/l below limit of quantification | 1.5 mg/l | < 3 % * | Mean · Much |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean · Much |
| Mercury | < 0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Mean · Much |
| Nickel | < 0,001 mg/l below limit of quantification | 20 µg/l | < 5 % * | Mean · Much |
| Nitrate | 12,3 mg/l | 50 mg/l | 25 % | Mean · Much |
| Nitrite | < 0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean · Much |
| Polycyclic aromatic hydrocarbons | 0 mg/l | 0.1 µg/l | 0 % | Mean · Much |
| Trihalomethanes — Total | 0,006 mg/l | 50 µg/l | 12 % | Mean · Much |
* 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 (15)
| 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 · Much |
| Ammonium | < 0,13 mg/l below limit of quantification | 0.5 mg/l | < 26 % * | Mean · Much |
| Chloride | 12,8 mg/l | 250 mg/l | 5 % | Mean · Much |
| Coliform bacteria | 0 /100 ml | 0/100 ml | — | Mean · Much |
| Colony count 22 °C | < 1 / 1ml below limit of quantification | ohne anormale Veränderung | — | Mean · Much |
| Colony count 36 °C | < 1 / 1ml below limit of quantification | ohne anormale Veränderung | — | Mean · Much |
| Colour | < 0,1 1/m below limit of quantification | 0.5 m⁻¹ | — | Mean · Much |
| Iron | 0,021 mg/l | 0.2 mg/l | 11 % | Mean · Much |
| Manganese | < 0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Mean · Much |
| pH | 8,2 | 6,5–9,5 | — | Mean · Much |
| Sodium | 5,7 mg/l | 200 mg/l | 3 % | Mean · Much |
| Sulphate | 11,2 mg/l | 250 mg/l | 4 % | Mean · Much |
| Temperature | 12,1 °C | — | — | Maximum · Much |
| Total organic carbon (TOC) | 1,5 mg/l | ohne anormale Veränderung | — | Mean · Much |
| Turbidity | 0,06 FNU | 1 NTU | — | Mean · Much |
* 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 (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 26,9 mg/l | — | — | Mean · Much |
| Hardness range (WRMG) | weich | — | — | Mean · Much |
| Magnesium | 2,9 mg/l | — | — | Mean · Much |
| Phosphate | < 0,03 mg/l below limit of quantification | — | — | Mean · Much |
| Potassium | <1,0 mg/l below limit of quantification | — | — | Mean · Much |
| Silicate / silicic acid | 3,5 mg/l | — | — | Mean · Much |
| Total hardness | 4,4 °dH | — | — | Mean · Much |
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.
Postcodes in this zone: 53773
neunkirchen-seelscheid gesamt
WahnbachtalsperrenverbandAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/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 (17 — most recent value per parameter)
Microbiology (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Intestinal enterococci | 0 /100ml | 0/100 ml | — | Single value |
Chemical parameters (10)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Antimony | < 0,001 mg/l below limit of quantification | 5 µg/l | < 20 % * | Single value |
| Arsenic | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Benzo(a)pyrene | < 0,000005 mg/l below limit of quantification | 10 ng/l | < 50 % * | Single value |
| Cadmium | < 0,0003 mg/l below limit of quantification | 3 µg/l | < 10 % * | Single value |
| Chlorite | 0,12 ± 0,03 mg/l | 0.2 mg/l | — | Mean |
| Copper | < 0,010 mg/l below limit of quantification | 2 mg/l | < 0.5 % * | Single value |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Mercury | < 0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Single value |
| Nickel | < 0,005 mg/l below limit of quantification | 20 µg/l | < 25 % * | Single value |
| Selenium | < 0,001 mg/l below limit of quantification | 10 µg/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.
Indicator parameters (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 0,005 mg/l below limit of quantification | 0.2 mg/l | < 3 % * | Single value |
| Coliform bacteria | 0 /100ml | 0/100 ml | — | Single value |
| Colony count 22 °C | 0 - 2 /1ml | ohne anormale Veränderung | — | Single value |
| Colony count 36 °C | 0 - 1 /1ml | ohne anormale Veränderung | — | Single value |
| Iron | < 0,010 mg/l below limit of quantification | 0.2 mg/l | < 5 % * | Single value |
| Manganese | < 0,005 mg/l below limit of quantification | 50 µg/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.
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.
Postcodes in this zone: 53773
Ost + West II
WahnbachtalsperrenverbandAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 10 ± 1 mg/l | 50 mg/l | — | Mean · Ost + West II |
| Sulphate | 25 ± 0,6 mg/l | 250 mg/l | — | Mean · Ost + West II |
| Sodium | 10,8 ± 1,0 mg/l | 200 mg/l | — | Mean · Ost + West II |
Show all recorded parameters (21 — most recent value per parameter)
Chemical parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Fluoride | < 0,1 mg/l below limit of quantification | 1.5 mg/l | < 7 % * | Mean · Ost + West II |
| Nitrate | 10 ± 1 mg/l | 50 mg/l | — | Mean · Ost + West II |
| Nitrite | < 0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean · Ost + West II |
* 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 (11)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Ammonium | < 0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean · Ost + West II |
| Chloride | 20 ± 2 mg/l | 250 mg/l | — | Mean · Ost + West II |
| Colour | 0,02 ± 0,01 m-1 | 0.5 m⁻¹ | — | Mean · Ost + West II |
| Conductivity (25 °C) | 24 ± 2 mS/m | 2,790 µS/cm | — | Mean · Ost + West II |
| Odour | ohne | für den Verbraucher annehmbar | — | Single value · Ost + West II |
| pH | 8,2 ± 0,1 | 6,5–9,5 | — | Mean · Ost + West II |
| Sodium | 10,8 ± 1,0 mg/l | 200 mg/l | — | Mean · Ost + West II |
| Sulphate | 25 ± 0,6 mg/l | 250 mg/l | — | Mean · Ost + West II |
| Taste | erfüllt | für den Verbraucher annehmbar | — | Single value · Ost + West II |
| Temperature | 8,8 ± 2,0 °C | — | — | Mean · Ost + West II |
| Turbidity | < 0,1 FNU below limit of quantification | 1 NTU | — | Mean · Ost + West II |
* 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 (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 25,3 ± 1,5 mg/l | — | — | Mean · Ost + West II |
| Carbonate hardness | 2,7 ± 0,4 °dH | — | — | Mean · Ost + West II |
| Magnesium | 5,2 ± 0,3 mg/l | — | — | Mean · Ost + West II |
| Phosphate | < 0,01 mg/l below limit of quantification | — | — | Mean · Ost + West II |
| Potassium | 2,1 ± 0,1 mg/l | — | — | Mean · Ost + West II |
| Silicate / silicic acid | 2,7 ± 0,3 mg/l | — | — | Mean · Ost + West II |
| Total hardness | 0,85 ± 0,05 mmol/l | — | — | Mean · Ost + West II |
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.
Postcodes in this zone: 53773
ruppichteroth gesamt
WahnbachtalsperrenverbandAssigned 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 31/12/2024. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Lead | < 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.
Show all recorded parameters (17 — most recent value per parameter)
Microbiology (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Intestinal enterococci | 0 /100ml | 0/100 ml | — | Mean |
Chemical parameters (11)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 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 |
| Benzo(a)pyrene | < 0,000005 mg/l below limit of quantification | 10 ng/l | < 50 % * | Mean |
| Cadmium | < 0,0006 mg/l below limit of quantification | 3 µg/l | < 20 % * | Mean |
| Chlorite | 0,13 ± 0,04 mg/l | 0.2 mg/l | — | Mean |
| Copper | < 0,010 mg/l below limit of quantification | 2 mg/l | < 0.5 % * | Mean |
| Cyanide | < 0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | 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 | < 0,005 mg/l below limit of quantification | 20 µg/l | < 25 % * | Mean |
| Selenium | < 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 (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 0,005 mg/l below limit of quantification | 0.2 mg/l | < 3 % * | Mean |
| Colony count 22 °C | 0 /1 ml | ohne anormale Veränderung | — | Mean |
| Colony count 36 °C | 0 - 2 /1 ml | ohne anormale Veränderung | — | Maximum |
| Iron | < 0,010 mg/l below limit of quantification | 0.2 mg/l | < 5 % * | Mean |
| Manganese | < 0,005 mg/l below limit of quantification | 50 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.
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.
Postcodes in this zone: 53773
siegburg gesamt
WahnbachtalsperrenverbandAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Lead | < 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.
Show all recorded parameters (25 — most recent value per parameter)
Microbiology (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Intestinal enterococci | 0 /100ml | 0/100 ml | — | Mean |
Chemical parameters (18)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | <0,0005 mg/l below limit of quantification | 3 µg/l | < 17 % * | Mean |
| Acrylamide | <0,00003 mg/l below limit of quantification | 0.1 µg/l | < 30 % * | 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 | < 0,0005 mg/l below limit of quantification | 1 µg/l | < 50 % * | Mean |
| Benzo(a)pyrene | < 0,000005 mg/l below limit of quantification | 10 ng/l | < 50 % * | Mean |
| Bisphenol A | <0,0005 mg/l below limit of quantification | 2.5 µg/l | < 20 % * | Mean |
| Cadmium | < 0,0003 mg/l below limit of quantification | 3 µg/l | < 10 % * | Mean |
| Chlorate | <0,050 mg/l below limit of quantification | 70 µg/l | < 71 % * | Mean |
| Chlorite | 0,12 ± 0,03 mg/l | 0.2 mg/l | — | Mean |
| Copper | < 0,010 mg/l below limit of quantification | 2 mg/l | < 0.5 % * | Mean |
| Cyanide | < 0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Mean |
| Epichlorohydrin | <0,00003 mg/l below limit of quantification | 0.1 µg/l | < 30 % * | 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 | < 0,005 mg/l below limit of quantification | 20 µg/l | < 25 % * | Mean |
| Selenium | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean |
| Vinyl chloride | <0,0005 mg/l below limit of quantification | 0.5 µg/l | < 100 % * | 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 (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 0,005 mg/l below limit of quantification | 0.2 mg/l | < 3 % * | Mean |
| Coliform bacteria | 0 /100ml | 0/100 ml | — | Mean |
| Colony count 22 °C | 0 - 2 /1ml | ohne anormale Veränderung | — | Mean |
| Colony count 36 °C | 0 - 1 /1ml | ohne anormale Veränderung | — | Mean |
| Iron | < 0,010 mg/l below limit of quantification | 0.2 mg/l | < 5 % * | Mean |
| Manganese | < 0,005 mg/l below limit of quantification | 50 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.
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.
Postcodes in this zone: 53773
Städte Siegburg, Hennef u. Königswinter
rhenagAssigned 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 03/01/2024. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 12 ± 1 mg/l | 50 mg/l | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Sulphate | 26 ± 1,0 mg/l | 250 mg/l | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Sodium | 10,7 ± 1,2 mg/l | 200 mg/l | — | Mean · Städte Siegburg, Hennef u. Königswinter |
* 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 (34 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Intestinal enterococci | 0 /100 ml | 0/100 ml | — | Mean · Städte Siegburg, Hennef u. Königswinter |
Chemical parameters (10)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Arsenic | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Copper | < 0,010 mg/l below limit of quantification | 2 mg/l | < 0.5 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Fluoride | < 0,1 mg/l below limit of quantification | 1.5 mg/l | < 7 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Mercury | < 0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Nickel | < 0,005 mg/l below limit of quantification | 20 µg/l | < 25 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Nitrate | 12 ± 1 mg/l | 50 mg/l | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Nitrite | < 0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Polycyclic aromatic hydrocarbons | 0 mg/l | 0.1 µg/l | 0 % | Mean · Städte Siegburg, Hennef u. Königswinter |
| Trihalomethanes — Total | 0 mg/l | 50 µg/l | 0 % | Mean · Städte Siegburg, Hennef u. Königswinter |
* 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 (15)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 0,005 mg/l below limit of quantification | 0.2 mg/l | < 3 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Ammonium | < 0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Chloride | 22 ± 1 mg/l | 250 mg/l | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Coliform bacteria | 0 /100 ml | 0/100 ml | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Colony count 22 °C | 4 / 1ml | ohne anormale Veränderung | — | Maximum · Städte Siegburg, Hennef u. Königswinter |
| Colony count 36 °C | 2 / 1ml | ohne anormale Veränderung | — | Maximum · Städte Siegburg, Hennef u. Königswinter |
| Colour | 0,02 ± 0,01 1/m | 0.5 m⁻¹ | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Iron | < 0,010 mg/l below limit of quantification | 0.2 mg/l | < 5 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| Manganese | < 0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Mean · Städte Siegburg, Hennef u. Königswinter |
| pH | 8,3 ± 0,1 | 6,5–9,5 | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Sodium | 10,7 ± 1,2 mg/l | 200 mg/l | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Sulphate | 26 ± 1,0 mg/l | 250 mg/l | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Temperature | 9,0 ± 1,9 °C | — | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Total organic carbon (TOC) | 1,0 ± 0,1 mg/l | ohne anormale Veränderung | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Turbidity | < 0,10 FNU below limit of quantification | 1 NTU | — | Mean · Städte Siegburg, Hennef u. Königswinter |
* 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 (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 25,2 ± 1,2 mg/l | — | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Hardness range (WRMG) | weich | — | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Magnesium | 5,3 ± 0,3 mg/l | — | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Phosphate | < 0,01 mg/l below limit of quantification | — | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Potassium | 2,3 ± 0,1 mg/l | — | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Silicate / silicic acid | 2,6 ± 0,3 mg/l | — | — | Mean · Städte Siegburg, Hennef u. Königswinter |
| Total hardness | 4,8 ± 0,2 °dH | — | — | Mean · Städte Siegburg, Hennef u. Königswinter |
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.
Postcodes in this zone: 53773
Frequently asked questions about drinking water in Hennef
- How much nitrate is in the drinking water in Hennef?
- 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 Hennef?
- 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.