Drinking water in Würenlos
One supply zone, water supplier: Technische Betriebe Würenlos.
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.
Würenlos
Technische Betriebe WürenlosAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
16.5 °dH
Hardness range hard
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 11.1 mg/l | 40 mg/l | 28 % | Mean · Würenlos |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Würenlos |
| Sulphate | 18.4 mg/l | — | — | Mean · Würenlos |
| Sodium | 16.6 mg/l | 200 mg/l | 8 % | Mean · Würenlos |
Show all recorded parameters (22 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | nn not detectable Unit not stated in the document | 300 1/ml | — | Mean · Würenlos |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Würenlos |
| Intestinal enterococci | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Würenlos |
Chemical parameters (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Fluoride | 0.1 mg/l | 1.5 mg/l | 7 % | Mean · Würenlos |
| Nitrate | 11.1 mg/l | 40 mg/l | 28 % | Mean · Würenlos |
PFAS (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorohexane sulfonic acid (PFHxS) | 0.009 µg/l | 0.3 µg/l | 3 % | Mean · Würenlos |
| Perfluorooctanesulfonic acid (PFOS) | 0.009 µg/l | 0.3 µg/l | 3 % | Mean · Würenlos |
| Perfluorooctanoic acid (PFOA) | 0.003 µg/l | 0.5 µg/l | 0.6 % | Mean · Würenlos |
Metabolites (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorothalonil metabolite R417888 | 0.02 µg/l | 0.1 µg/l | 20 % | Mean · Würenlos |
| Chlorothalonil metabolite R471811 | 0.08 µg/l | 0.1 µg/l | 80 % | Mean · Würenlos |
Indicator parameters (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 23.4 mg/l | — | — | Mean · Würenlos |
| Conductivity (25 °C) | 578 µS/cm | — | — | Mean · Würenlos |
| pH | 7.41 | — | — | Mean · Würenlos |
| Sodium | 16.6 mg/l | 200 mg/l | 8 % | Mean · Würenlos |
| Sulphate | 18.4 mg/l | — | — | Mean · Würenlos |
| Temperature | 13.7 °C | — | — | Mean · Würenlos |
| Turbidity | 0.1 TE/F | — | — | Mean · Würenlos |
Further parameters (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 2.2 mg/l | — | — | Mean · Würenlos |
| Dissolved organic carbon (DOC) | 0.29 mg/l | — | — | Mean · Würenlos |
| Magnesium | 18.2 mg/l | — | — | Mean · Würenlos |
| Potassium | 2.2 mg/l | — | — | Mean · Würenlos |
| Total hardness | 29.5 °fH | — | — | Mean · Würenlos |
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://trinkwasser.ch/de/versorger/872/technische-betriebe-wurenlos/2608/wurenlos · 2025 · 2025 · retrieved on 07/08/2026
Postcodes in this zone: 5436
Frequently asked questions about drinking water in Würenlos
- How hard is the water in Würenlos?
- Technische Betriebe Würenlos publishes a total hardness of 29.5 °fH for the supply zone Würenlos — that corresponds to 16.5 °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: 2025, retrieved on 07/08/2026.
- How much nitrate is in the drinking water in Würenlos?
- Technische Betriebe Würenlos publishes a nitrate value of 11.1 mg/l for the supply zone Würenlos. The statutory parametric value is 40 mg/l; the measured value represents 28 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
- Who supplies the drinking water in Würenlos?
- Technische Betriebe Würenlos. The values shown here come from the supply zone Würenlos 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.