Drinking water in Mülheim an der Ruhr
One supply zone, water supplier: RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH.
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.
Mülheim-Styrum-Ost, Mülheim-Styrum-West
RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbHAssigned 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 | 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)
| 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)
| 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)
| 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.
Postcodes in this zone: 45468 , 45470 , 45472 , 45473 , 45475 , 45476 , 45478 , 45479 , 45481
Frequently asked questions about drinking water in Mülheim an der Ruhr
- How hard is the water in Mülheim an der Ruhr?
- RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH publishes a total hardness of 8 °dH for the supply zone Mülheim-Styrum-Ost, Mülheim-Styrum-West (hardness range weich). 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 25/07/2026.
- How much nitrate is in the drinking water in Mülheim an der Ruhr?
- RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH publishes a nitrate value of 8,7 mg/l for the supply zone Mülheim-Styrum-Ost, Mülheim-Styrum-West. The statutory parametric value is 50 mg/l; the measured value represents 17 % of the parametric value. Basis: Publication by the water supplier, retrieved on 25/07/2026.
- Who supplies the drinking water in Mülheim an der Ruhr?
- RWW Rheinisch-Westfälische Wasserwerksgesellschaft mbH. The values shown here come from the supply zone Mülheim-Styrum-Ost, Mülheim-Styrum-West 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.