Drinking water in Duisburg
4 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.
Versorgungsbereich 1 - südlich der Ruhr einschl. Rheinhausen
Stadtwerke DuisburgWater hardness
17.9 °dH
Hardness range hart
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 21 ng/l | 0.1 µg/l | 21 % | Mean · Q1 2026 |
| Nitrate | 18 mg/l | 50 mg/l | 36 % | Mean · Q1 2026 |
| Lead | n.n. µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Mean · Q1 2026 |
| Sulphate | 69 mg/l | 250 mg/l | 28 % | Mean · Q1 2026 |
| Sodium | 22 mg/l | 200 mg/l | 11 % | Mean · Q1 2026 |
Show all recorded parameters (64 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Mean · Q1 2026 |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Mean · Q1 2026 |
Chemical parameters (28)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | n.n. µg/l not detectable | 3 µg/l | — | Mean · Q1 2026 |
| Acrylamide | n.n. µg/l not detectable | 0.1 µg/l | — | Mean · Q1 2026 |
| Antimony | n.n. µg/l not detectable | 5 µg/l | — | Mean · Q1 2026 |
| Arsenic | n.n. µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Benzene | n.n. µg/l not detectable | 1 µg/l | — | Mean · Q1 2026 |
| Benzo(a)pyrene | n.n. µg/l not detectable | 10 ng/l | — | Mean · Q1 2026 |
| Boron | 32 µg/l | 1 mg/l | 3 % | Mean · Q1 2026 |
| Bromate | 1,2 µg/l | 10 µg/l | 12 % | Mean · Q1 2026 |
| Cadmium | n.n. µg/l not detectable | 3 µg/l | — | Mean · Q1 2026 |
| Chlorate | n.n. µg/l not detectable | 70 µg/l | — | Mean · Q1 2026 |
| Chromium | n.n. µg/l not detectable | 25 µg/l | — | Mean · Q1 2026 |
| Copper | n.n. mg/l not detectable | 2 mg/l | — | Mean · Q1 2026 |
| Cyanide | n.n. µg/l not detectable | 50 µg/l | — | Mean · Q1 2026 |
| Epichlorohydrin | n.n. µg/l not detectable | 0.1 µg/l | — | Mean · Q1 2026 |
| Fluoride | n.n. mg/l not detectable | 1.5 mg/l | — | Mean · Q1 2026 |
| Haloacetic acids (HAA) | n.n. µg/l not detectable | 60 µg/l | — | Mean · Q1 2026 |
| Lead | n.n. µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Mercury | n.n. µg/l not detectable | 1 µg/l | — | Mean · Q1 2026 |
| Nickel | n.n. µg/l not detectable | 20 µg/l | — | Mean · Q1 2026 |
| Nitrate | 18 mg/l | 50 mg/l | 36 % | Mean · Q1 2026 |
| Nitrite | n.n. mg/l not detectable | 0.5 mg/l | — | Mean · Q1 2026 |
| Pesticides — Total | n.n. µg/l not detectable | 0.5 µg/l | — | Mean · Q1 2026 |
| Polycyclic aromatic hydrocarbons | n.n µg/l not detectable | 0.1 µg/l | — | Mean · Q1 2026 |
| Selenium | n.n. µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Tetrachloroethene and Trichloroethene (sum) | n.n µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Trihalomethanes — Total | 5,8 µg/l | 50 µg/l | 12 % | Mean · Q1 2026 |
| Uranium | 0,5 µg/l | 10 µg/l | 5 % | Mean · Q1 2026 |
| Vinyl chloride | n.n. µg/l not detectable | 0.5 µg/l | — | Mean · Q1 2026 |
PFAS (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of 4 PFAS | 0,5 ng/l | — | — | Mean · Q1 2026 |
| Sum of PFAS | 21 ng/l | 0.1 µg/l | 21 % | Mean · Q1 2026 |
Indicator parameters (20)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | 14 µg/l | 0.2 mg/l | 7 % | Mean · Q1 2026 |
| Ammonium | n.n. µg/l not detectable | 0.5 mg/l | — | Mean · Q1 2026 |
| Calcite dissolution capacity | eingehalten mg/l | 5 mg/l CaCO3 | — | Mean · Q1 2026 |
| Chloride | 45 mg/l | 250 mg/l | 18 % | Mean · Q1 2026 |
| Clostridium perfringens (including spores) | 0 KBE/100ml | 0/100 ml | — | Mean · Q1 2026 |
| Coliform bacteria | 0 KBE/100ml | 0/100 ml | — | Mean · Q1 2026 |
| Colony count 22 °C | 2 KBE/ml | ohne anormale Veränderung | — | Mean · Q1 2026 |
| Colony count 36 °C | 1 KBE/ml | ohne anormale Veränderung | — | Mean · Q1 2026 |
| Colour | 0,02 1/m | 0.5 m⁻¹ | — | Mean · Q1 2026 |
| Conductivity (25 °C) | 718 µS/cm | 2,790 µS/cm | — | Mean · Q1 2026 |
| Iron | n.n. mg/l not detectable | 0.2 mg/l | — | Mean · Q1 2026 |
| Manganese | 0,7 µg/l | 50 µg/l | 1 % | Mean · Q1 2026 |
| Odour | ohne | für den Verbraucher annehmbar | — | Mean · Q1 2026 |
| pH | 7,2 | 6,5–9,5 | — | Mean · Q1 2026 |
| Sodium | 22 mg/l | 200 mg/l | 11 % | Mean · Q1 2026 |
| Sulphate | 69 mg/l | 250 mg/l | 28 % | Mean · Q1 2026 |
| Taste | ohne | für den Verbraucher annehmbar | — | Mean · Q1 2026 |
| Temperature | 11 °C | — | — | Mean · Q1 2026 |
| Total organic carbon (TOC) | eingehalten mg/l | ohne anormale Veränderung | — | Mean · Q1 2026 |
| Turbidity | 0,1 NTU | 1 NTU | — | Mean · Q1 2026 |
Further parameters (12)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 4,6 mol/m³ | — | — | Mean · Q1 2026 |
| Base capacity to pH 8.2 | 0,5 mol/m³ | — | — | Mean · Q1 2026 |
| Calcium | 110 mg/l | — | — | Mean · Q1 2026 |
| Carbonate hardness | 13 °dH | — | — | Mean · Q1 2026 |
| Hardness range (WRMG) | hart | — | — | Mean · Q1 2026 |
| Magnesium | 11 mg/l | — | — | Mean · Q1 2026 |
| Oxygen | 7,3 mg/l | — | — | Mean · Q1 2026 |
| Phosphate | 0,4 mg/l | — | — | Mean · Q1 2026 |
| Potassium | 3,3 mg/l | — | — | Mean · Q1 2026 |
| Silicate / silicic acid | 10 mg/l | — | — | Mean · Q1 2026 |
| Spectral absorption coefficient 254 nm (SAC 254) | 0,6 1/m | — | — | Mean · Q1 2026 |
| Total hardness | 3,2 mmol/l | — | — | Mean · Q1 2026 |
Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.
Source: https://www.stadtwerke-duisburg.de/fileadmin/user_upload/Veroeffentlichungen/Trinkwasseranalyse_Sued.pdf · Jahresmittelwerte 2025 und Quartal 2026/1 · retrieved on 11/07/2026
Postcodes in this zone: 47051 , 47053 , 47055 , 47057 , 47058 , 47059 , 47119 , 47198 , 47226 , 47228 , 47229 , 47239 , 47249 , 47259 , 47269 , 47279
Show 3 more supply zones
Water hardness
11.3 °dH
Hardness range mittel
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 11,6 mg/l | 50 mg/l | 23 % | 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 | 48 mg/l | 250 mg/l | 19 % | Mean |
| Sodium | 19 mg/l | 200 mg/l | 9 % | 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)
| 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)
| 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 | 0,0007 mg/l | 10 µg/l | 7 % | 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 | 0,06 mg/l | 1 mg/l | 6 % | 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 | 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 | 0,16 mg/l | 1.5 mg/l | 11 % | 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 | 11,6 mg/l | 50 mg/l | 23 % | Mean |
| Nitrite | 0,06 mg/l | 0.5 mg/l | 12 % | 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 | 0,05 µg/l | 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)
| 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 | 0 mg/l | 5 mg/l CaCO3 | — | Mean |
| Chloride | 26 mg/l | 250 mg/l | 10 % | 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 | 0,2 1/m | 0.5 m⁻¹ | — | Mean |
| Conductivity (25 °C) | 487 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 | 50 µg/l | 4 % | Mean |
| pH | 7,55 | 6,5–9,5 | — | Mean |
| Sodium | 19 mg/l | 200 mg/l | 9 % | Mean |
| Sulphate | 48 mg/l | 250 mg/l | 19 % | Mean |
| Temperature | 13,3 °C | — | — | Mean |
| Total organic carbon (TOC) | 3 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)
| 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)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 2,97 mmol/l | — | — | Mean |
| Base capacity to pH 8.2 | 0,21 mmol/l | — | — | Mean |
| Calcium | 73 mg/l | — | — | Mean |
| Carbonate hardness | 8,4 °dH | — | — | Mean |
| Hardness range (WRMG) | mittel | — | — | Mean |
| Magnesium | 4,8 mg/l | — | — | Mean |
| Oxygen | 6,9 mg/l | — | — | Mean |
| Phosphate | 0,12 mg/l | — | — | Mean |
| Potassium | 5,3 mg/l | — | — | Mean |
| Silicate / silicic acid | 8,6 mg/l | — | — | Mean |
| Total hardness | 11,3 °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.stadtwerke-herne.de/I.Privatkunden/04-Wasser/Trinkwasseranalyse%20Haltern_2025.pdf · 2025 · retrieved on 11/07/2026
Postcodes in this zone: 47058 , 47059 , 47119 , 47137 , 47138 , 47139 , 47166 , 47167 , 47169 , 47178 , 47179 , 47198 , 47199
Versorgungsbereich 2 - Nördlich der Ruhr ohne Homberg und Baerl (Ruhrort nur nördlich Vinckekanal)
Stadtwerke DuisburgWater hardness
10.7 °dH
Hardness range mittel
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 14 ng/l | 0.1 µg/l | 14 % | Mean · Q1 2026 |
| Nitrate | 11 mg/l | 50 mg/l | 22 % | Mean · Q1 2026 |
| Lead | n.n. µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Mean · Q1 2026 |
| Sulphate | 50 mg/l | 250 mg/l | 20 % | Mean · Q1 2026 |
| Sodium | 18 mg/l | 200 mg/l | 9 % | Mean · Q1 2026 |
Show all recorded parameters (64 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Mean · Q1 2026 |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Mean · Q1 2026 |
Chemical parameters (28)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | n.n. µg/l not detectable | 3 µg/l | — | Mean · Q1 2026 |
| Acrylamide | n.n. µg/l not detectable | 0.1 µg/l | — | Mean · Q1 2026 |
| Antimony | n.n. µg/l not detectable | 5 µg/l | — | Mean · Q1 2026 |
| Arsenic | n.n. µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Benzene | n.n. µg/l not detectable | 1 µg/l | — | Mean · Q1 2026 |
| Benzo(a)pyrene | n.n. µg/l not detectable | 10 ng/l | — | Mean · Q1 2026 |
| Bisphenol A | n.n. µg/l not detectable | 2.5 µg/l | — | Mean · Q1 2026 |
| Boron | 49 µg/l | 1 mg/l | 5 % | Mean · Q1 2026 |
| Bromate | n.n. µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Cadmium | n.n. µg/l not detectable | 3 µg/l | — | Mean · Q1 2026 |
| Chlorate | 3,0 µg/l | 70 µg/l | 4 % | Mean · Q1 2026 |
| Chromium | n.n. µg/l not detectable | 25 µg/l | — | Mean · Q1 2026 |
| Copper | n.n. mg/l not detectable | 2 mg/l | — | Mean · Q1 2026 |
| Cyanide | n.n. µg/l not detectable | 50 µg/l | — | Mean · Q1 2026 |
| Epichlorohydrin | n.n. µg/l not detectable | 0.1 µg/l | — | Mean · Q1 2026 |
| Fluoride | 0,1 mg/l | 1.5 mg/l | 7 % | Mean · Q1 2026 |
| Lead | n.n. µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Mercury | n.n. µg/l not detectable | 1 µg/l | — | Mean · Q1 2026 |
| Nickel | 0,9 µg/l | 20 µg/l | 4 % | Mean · Q1 2026 |
| Nitrate | 11 mg/l | 50 mg/l | 22 % | Mean · Q1 2026 |
| Nitrite | n.n. mg/l not detectable | 0.5 mg/l | — | Mean · Q1 2026 |
| Pesticides — Total | n.n. µg/l not detectable | 0.5 µg/l | — | Mean · Q1 2026 |
| Polycyclic aromatic hydrocarbons | n.n µg/l not detectable | 0.1 µg/l | — | Mean · Q1 2026 |
| Selenium | n.n. µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Tetrachloroethene and Trichloroethene (sum) | n.n µg/l not detectable | 10 µg/l | — | Mean · Q1 2026 |
| Trihalomethanes — Total | n.n. µg/l not detectable | 50 µg/l | — | Mean · Q1 2026 |
| Uranium | 0,4 µg/l | 10 µg/l | 4 % | Mean · Q1 2026 |
| Vinyl chloride | n.n. µg/l not detectable | 0.5 µg/l | — | Mean · Q1 2026 |
PFAS (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of 4 PFAS | 5,1 ng/l | — | — | Mean · Q1 2026 |
| Sum of PFAS | 14 ng/l | 0.1 µg/l | 14 % | Mean · Q1 2026 |
Indicator parameters (20)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | 12 µg/l | 0.2 mg/l | 6 % | Mean · Q1 2026 |
| Ammonium | n.n. µg/l not detectable | 0.5 mg/l | — | Mean · Q1 2026 |
| Calcite dissolution capacity | eingehalten mg/l | 5 mg/l CaCO3 | — | Mean · Q1 2026 |
| Chloride | 30 mg/l | 250 mg/l | 12 % | Mean · Q1 2026 |
| Clostridium perfringens (including spores) | 0 KBE/100ml | 0/100 ml | — | Mean · Q1 2026 |
| Coliform bacteria | 0 KBE/100ml | 0/100 ml | — | Mean · Q1 2026 |
| Colony count 22 °C | 0 KBE/ml | ohne anormale Veränderung | — | Mean · Q1 2026 |
| Colony count 36 °C | 1 KBE/ml | ohne anormale Veränderung | — | Mean · Q1 2026 |
| Colour | 0,2 1/m | 0.5 m⁻¹ | — | Mean · Q1 2026 |
| Conductivity (25 °C) | 477 µS/cm | 2,790 µS/cm | — | Mean · Q1 2026 |
| Iron | n.n. mg/l not detectable | 0.2 mg/l | — | Mean · Q1 2026 |
| Manganese | 1,7 µg/l | 50 µg/l | 3 % | Mean · Q1 2026 |
| Odour | ohne | für den Verbraucher annehmbar | — | Mean · Q1 2026 |
| pH | 7,4 | 6,5–9,5 | — | Mean · Q1 2026 |
| Sodium | 18 mg/l | 200 mg/l | 9 % | Mean · Q1 2026 |
| Sulphate | 50 mg/l | 250 mg/l | 20 % | Mean · Q1 2026 |
| Taste | ohne | für den Verbraucher annehmbar | — | Mean · Q1 2026 |
| Temperature | 11 °C | — | — | Mean · Q1 2026 |
| Total organic carbon (TOC) | eingehalten mg/l | ohne anormale Veränderung | — | Mean · Q1 2026 |
| Turbidity | 0,1 NTU | 1 NTU | — | Mean · Q1 2026 |
Further parameters (12)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 2,8 mol/m³ | — | — | Mean · Q1 2026 |
| Base capacity to pH 8.2 | 0,2 mol/m³ | — | — | Mean · Q1 2026 |
| Calcium | 70 mg/l | — | — | Mean · Q1 2026 |
| Carbonate hardness | 7,9 °dH | — | — | Mean · Q1 2026 |
| Hardness range (WRMG) | mittel | — | — | Mean · Q1 2026 |
| Magnesium | 4,8 mg/l | — | — | Mean · Q1 2026 |
| Oxygen | 7,8 mg/l | — | — | Mean · Q1 2026 |
| Phosphate | n.n. mg/l not detectable | — | — | Mean · Q1 2026 |
| Potassium | 4,8 mg/l | — | — | Mean · Q1 2026 |
| Silicate / silicic acid | 8,1 mg/l | — | — | Mean · Q1 2026 |
| Spectral absorption coefficient 254 nm (SAC 254) | 6,1 1/m | — | — | Mean · Q1 2026 |
| Total hardness | 1,9 mmol/l | — | — | Mean · Q1 2026 |
Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.
Source: https://www.stadtwerke-duisburg.de/fileadmin/user_upload/Veroeffentlichungen/Trinkwasseranalyse_Nord.pdf · Jahresmittelwerte 2025 und Quartal 2026/1 · retrieved on 11/07/2026
Postcodes in this zone: 47058 , 47059 , 47119 , 47137 , 47138 , 47139 , 47166 , 47167 , 47169 , 47178 , 47179 , 47198 , 47199
Werksausgang - Trinkwasser nach Desinfektion
Wasserverbund Niederrhein GmbHAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
12.7 °dH
Hardness range mittel
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 9,5 mg/l | 50 mg/l | 19 % | Mean |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean |
| Sulphate | 52,9 mg/l | 250 mg/l | 21 % | Mean |
| Sodium | 29,2 mg/l | 200 mg/l | 15 % | 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 (42 — most recent value per parameter)
Chemical parameters (23)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | < 0,1 µg/l below limit of quantification | 3 µg/l | < 3 % * | Mean |
| Acrylamide | < 0,03 µg/l below limit of quantification | 0.1 µg/l | < 30 % * | Mean |
| Antimony | < 0,0010 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 | < 0,1 µg/l below limit of quantification | 1 µg/l | < 10 % * | Mean |
| Benzo(a)pyrene | < 0,002 µg/l below limit of quantification | 10 ng/l | < 20 % * | Mean |
| Boron | 0,037 mg/l | 1 mg/l | 4 % | Mean |
| Bromate | < 0,002 mg/l below limit of quantification | 10 µg/l | < 20 % * | Mean |
| Cadmium | < 0,0002 mg/l below limit of quantification | 3 µg/l | < 7 % * | Mean |
| Chromium | < 0,001 mg/l below limit of quantification | 25 µg/l | < 4 % * | Mean |
| Copper | < 0,0020 mg/l below limit of quantification | 2 mg/l | < 0.1 % * | Mean |
| Cyanide | < 0,0050 mg/l below limit of quantification | 50 µg/l | < 10 % * | Mean |
| Epichlorohydrin | < 0,03 µg/l below limit of quantification | 0.1 µg/l | < 30 % * | Mean |
| Fluoride | 0,12 mg/l | 1.5 mg/l | 8 % | 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 | < 0,002 mg/l below limit of quantification | 20 µg/l | < 10 % * | Mean |
| Nitrate | 9,5 mg/l | 50 mg/l | 19 % | Mean |
| Nitrite | < 0,002 mg/l below limit of quantification | 0.5 mg/l | < 0.4 % * | 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 |
| Uranium | 0,725 µg/l | 10 µg/l | 7 % | Mean |
| Vinyl chloride | < 0,05 µg/l below limit of quantification | 0.5 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 (12)
| 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 | < 0,2 mg/l below limit of quantification | 0.5 mg/l | < 40 % * | Mean |
| Chloride | 50,4 mg/l | 250 mg/l | 20 % | Mean |
| Colour | - 1/m not determined | 0.5 m⁻¹ | — | Mean |
| Conductivity (25 °C) | 592 µS/cm | 2,790 µS/cm | — | Mean |
| Iron | < 0,010 mg/l below limit of quantification | 0.2 mg/l | < 5 % * | Mean |
| Manganese | < 0,010 mg/l below limit of quantification | 50 µg/l | < 20 % * | Mean |
| Sodium | 29,2 mg/l | 200 mg/l | 15 % | Mean |
| Sulphate | 52,9 mg/l | 250 mg/l | 21 % | Mean |
| Temperature | 13,9 °C | — | — | Mean |
| Total organic carbon (TOC) | 0,64 mg/l | ohne anormale Veränderung | — | Mean |
| Turbidity | < 0,10 NTU 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.
Further parameters (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 72,3 mg/l | — | — | Mean |
| Hardness range (WRMG) | mittel | — | — | Single value |
| Magnesium | 10,5 mg/l | — | — | Mean |
| Oxygen | 4,9 mg/l | — | — | Mean |
| Phosphate | 0,11 mg/l | — | — | Mean |
| Potassium | 3,6 mg/l | — | — | Mean |
| Total hardness | 12,7 °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.rww.de/fileadmin/assets/pdf/trinkwasseranalyse_rheurdt.pdf · 2025 · retrieved on 13/07/2026
Postcodes in this zone: 47051 , 47053 , 47055 , 47057 , 47058 , 47059 , 47119 , 47137 , 47138 , 47139 , 47166 , 47167 , 47169 , 47178 , 47179 , 47198 , 47199 , 47226 , 47228 , 47229 , 47239 , 47249 , 47259 , 47269 , 47279
Frequently asked questions about drinking water in Duisburg
- How hard is the water in Duisburg?
- Stadtwerke Duisburg publishes a total hardness of 3,2 mmol/l for the supply zone Versorgungsbereich 1 - südlich der Ruhr einschl. Rheinhausen — that corresponds to 17.9 °dH. 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 Duisburg?
- Stadtwerke Duisburg publishes a nitrate value of 18 mg/l for the supply zone Versorgungsbereich 1 - südlich der Ruhr einschl. Rheinhausen. The statutory parametric value is 50 mg/l; the measured value represents 36 % of the parametric value. Basis: Publication by the water supplier, retrieved on 11/07/2026.
- Are PFAS detectable in the drinking water in Duisburg?
- Stadtwerke Duisburg publishes for the supply zone Versorgungsbereich 1 - südlich der Ruhr einschl. Rheinhausen a sum value PFAS-20 of 21 ng/l (0.021 µg/l). The statutory parametric value is 0.1 µg/l; the measured value represents 21 % of the parametric value. For the sum of the 20 individual substances, this parametric value has applied since 12/01/2026. Basis: Publication by the water supplier, retrieved on 11/07/2026.
- Who supplies the drinking water in Duisburg?
- Stadtwerke Duisburg. The values shown here come from the supply zone Versorgungsbereich 1 - südlich der Ruhr einschl. Rheinhausen 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.