Drinking water in Birmensdorf ZH
6 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.
Zone Berg
Wasserversorgung Birmensdorf ZHAssigned 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 | 14.5 mg/l | 40 mg/l | 36 % | Mean · Zone Berg |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Berg |
| Sulphate | 21.6 mg/l | — | — | Mean · Zone Berg |
| Sodium | 19 mg/l | 200 mg/l | 9 % | Mean · Zone Berg |
Show all recorded parameters (18 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 19 KBE/ml | 300 1/ml | — | Mean · Zone Berg |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Berg |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Berg |
Chemical parameters (2)
| 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 · Zone Berg |
| Nitrate | 14.5 mg/l | 40 mg/l | 36 % | Mean · Zone Berg |
* 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.
PFAS (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorohexane sulfonic acid (PFHxS) | 0.001 µg/l | 0.3 µg/l | 0.3 % | Mean · Zone Berg |
| Perfluorooctanesulfonic acid (PFOS) | 0.0017 µg/l | 0.3 µg/l | 0.6 % | Mean · Zone Berg |
Metabolites (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorothalonil metabolite R471811 | 0.066 µg/l | 0.1 µg/l | 66 % | Mean · Zone Berg |
Indicator parameters (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 28.6 mg/l | — | — | Mean · Zone Berg |
| Conductivity (25 °C) | 628.6 µS/cm | — | — | Mean · Zone Berg |
| pH | 7.4 | — | — | Mean · Zone Berg |
| Sodium | 19 mg/l | 200 mg/l | 9 % | Mean · Zone Berg |
| Sulphate | 21.6 mg/l | — | — | Mean · Zone Berg |
| Temperature | 13.2 °C | — | — | Mean · Zone Berg |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 102 mg/l | — | — | Mean · Zone Berg |
| Magnesium | 19.8 mg/l | — | — | Mean · Zone Berg |
| Potassium | 2.96 mg/l | — | — | Mean · Zone Berg |
| Total hardness | 35 °fH | — | — | Mean · Zone Berg |
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: 8903
Show 5 more supply zones
Zone Dorf
Wasserversorgung Birmensdorf ZHAssigned 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 | 14.5 mg/l | 40 mg/l | 36 % | Mean · Zone Dorf |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Dorf |
| Sulphate | 21.6 mg/l | — | — | Mean · Zone Dorf |
| Sodium | 19 mg/l | 200 mg/l | 9 % | Mean · Zone Dorf |
Show all recorded parameters (18 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 19 KBE/ml | 300 1/ml | — | Mean · Zone Dorf |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Dorf |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Dorf |
Chemical parameters (2)
| 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 · Zone Dorf |
| Nitrate | 14.5 mg/l | 40 mg/l | 36 % | Mean · Zone Dorf |
* 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.
PFAS (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorohexane sulfonic acid (PFHxS) | 0.001 µg/l | 0.3 µg/l | 0.3 % | Mean · Zone Dorf |
| Perfluorooctanesulfonic acid (PFOS) | 0.0017 µg/l | 0.3 µg/l | 0.6 % | Mean · Zone Dorf |
Metabolites (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorothalonil metabolite R471811 | 0.066 µg/l | 0.1 µg/l | 66 % | Mean · Zone Dorf |
Indicator parameters (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 28.6 mg/l | — | — | Mean · Zone Dorf |
| Conductivity (25 °C) | 628.6 µS/cm | — | — | Mean · Zone Dorf |
| pH | 7.4 | — | — | Mean · Zone Dorf |
| Sodium | 19 mg/l | 200 mg/l | 9 % | Mean · Zone Dorf |
| Sulphate | 21.6 mg/l | — | — | Mean · Zone Dorf |
| Temperature | 13.2 °C | — | — | Mean · Zone Dorf |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 102 mg/l | — | — | Mean · Zone Dorf |
| Magnesium | 19.8 mg/l | — | — | Mean · Zone Dorf |
| Potassium | 2.96 mg/l | — | — | Mean · Zone Dorf |
| Total hardness | 35 °fH | — | — | Mean · Zone Dorf |
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: 8903
Zone Filderen
Wasserversorgung Birmensdorf ZHAssigned 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 | 4.8 mg/l | 40 mg/l | 12 % | Mean · Zone Filderen |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Filderen |
| Sulphate | 13.1 mg/l | — | — | Mean · Zone Filderen |
| Sodium | 6.8 mg/l | 200 mg/l | 3 % | Mean · Zone Filderen |
Show all recorded parameters (15 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 5 KBE/ml | 300 1/ml | — | Mean · Zone Filderen |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Filderen |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Filderen |
Chemical parameters (2)
| 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 · Zone Filderen |
| Nitrate | 4.8 mg/l | 40 mg/l | 12 % | Mean · Zone Filderen |
* 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 |
|---|---|---|---|---|
| Chloride | 6.8 mg/l | — | — | Mean · Zone Filderen |
| Conductivity (25 °C) | 370 µS/cm | — | — | Mean · Zone Filderen |
| pH | 7.8 | — | — | Mean · Zone Filderen |
| Sodium | 6.8 mg/l | 200 mg/l | 3 % | Mean · Zone Filderen |
| Sulphate | 13.1 mg/l | — | — | Mean · Zone Filderen |
| Temperature | 10.15 °C | — | — | Mean · Zone Filderen |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 57.5 mg/l | — | — | Mean · Zone Filderen |
| Magnesium | 9.4 mg/l | — | — | Mean · Zone Filderen |
| Potassium | 1.2 mg/l | — | — | Mean · Zone Filderen |
| Total hardness | 18.2 °fH | — | — | Mean · Zone Filderen |
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: 8903
Zone Haslen
Wasserversorgung Birmensdorf ZHAssigned 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 | 6.85 mg/l | 40 mg/l | 17 % | Mean · Zone Haslen |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Haslen |
| Sulphate | 21.5 mg/l | — | — | Mean · Zone Haslen |
| Sodium | 12.5 mg/l | 200 mg/l | 6 % | Mean · Zone Haslen |
Show all recorded parameters (14 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 16.5 KBE/ml | 300 1/ml | — | Mean · Zone Haslen |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Haslen |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Haslen |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 6.85 mg/l | 40 mg/l | 17 % | Mean · Zone Haslen |
Indicator parameters (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 15.85 mg/l | — | — | Mean · Zone Haslen |
| Conductivity (25 °C) | 466 µS/cm | — | — | Mean · Zone Haslen |
| pH | 7.6 | — | — | Mean · Zone Haslen |
| Sodium | 12.5 mg/l | 200 mg/l | 6 % | Mean · Zone Haslen |
| Sulphate | 21.5 mg/l | — | — | Mean · Zone Haslen |
| Temperature | 14.25 °C | — | — | Mean · Zone Haslen |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 75.75 mg/l | — | — | Mean · Zone Haslen |
| Magnesium | 14.55 mg/l | — | — | Mean · Zone Haslen |
| Potassium | 2.9 mg/l | — | — | Mean · Zone Haslen |
| Total hardness | 25 °fH | — | — | Mean · Zone Haslen |
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: 8903
Zone Ristet
Wasserversorgung Birmensdorf ZHAssigned 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 | 13.7 mg/l | 40 mg/l | 34 % | Mean · Zone Ristet |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Ristet |
| Sulphate | 14.5 mg/l | — | — | Mean · Zone Ristet |
| Sodium | 17.45 mg/l | 200 mg/l | 9 % | Mean · Zone Ristet |
Show all recorded parameters (15 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 4 KBE/ml | 300 1/ml | — | Mean · Zone Ristet |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Ristet |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Ristet |
Chemical parameters (2)
| 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 · Zone Ristet |
| Nitrate | 13.7 mg/l | 40 mg/l | 34 % | Mean · Zone Ristet |
* 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 |
|---|---|---|---|---|
| Chloride | 33.8 mg/l | — | — | Mean · Zone Ristet |
| Conductivity (25 °C) | 670 µS/cm | — | — | Mean · Zone Ristet |
| pH | 7.5 | — | — | Mean · Zone Ristet |
| Sodium | 17.45 mg/l | 200 mg/l | 9 % | Mean · Zone Ristet |
| Sulphate | 14.5 mg/l | — | — | Mean · Zone Ristet |
| Temperature | 12.2 °C | — | — | Mean · Zone Ristet |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 95 mg/l | — | — | Mean · Zone Ristet |
| Magnesium | 20.5 mg/l | — | — | Mean · Zone Ristet |
| Potassium | 3.4 mg/l | — | — | Mean · Zone Ristet |
| Total hardness | 32 °fH | — | — | Mean · Zone Ristet |
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: 8903
Zone Sternen-Risi
Wasserversorgung Birmensdorf ZHAssigned 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 | 4.35 mg/l | 40 mg/l | 11 % | Mean · Zone Sternen-Risi |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Sternen-Risi |
| Sulphate | 13.35 mg/l | — | — | Mean · Zone Sternen-Risi |
| Sodium | 7.05 mg/l | 200 mg/l | 4 % | Mean · Zone Sternen-Risi |
Show all recorded parameters (15 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 19 KBE/ml | 300 1/ml | — | Mean · Zone Sternen-Risi |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Sternen-Risi |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Zone Sternen-Risi |
Chemical parameters (2)
| 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 · Zone Sternen-Risi |
| Nitrate | 4.35 mg/l | 40 mg/l | 11 % | Mean · Zone Sternen-Risi |
* 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 |
|---|---|---|---|---|
| Chloride | 7.35 mg/l | — | — | Mean · Zone Sternen-Risi |
| Conductivity (25 °C) | 327 µS/cm | — | — | Mean · Zone Sternen-Risi |
| pH | 7.85 | — | — | Mean · Zone Sternen-Risi |
| Sodium | 7.05 mg/l | 200 mg/l | 4 % | Mean · Zone Sternen-Risi |
| Sulphate | 13.35 mg/l | — | — | Mean · Zone Sternen-Risi |
| Temperature | 13.5 °C | — | — | Mean · Zone Sternen-Risi |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 1.25 mg/l | — | — | Mean · Zone Sternen-Risi |
| Magnesium | 9.55 mg/l | — | — | Mean · Zone Sternen-Risi |
| Potassium | 1.25 mg/l | — | — | Mean · Zone Sternen-Risi |
| Total hardness | 18 °fH | — | — | Mean · Zone Sternen-Risi |
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: 8903
Frequently asked questions about drinking water in Birmensdorf ZH
- How hard is the water in Birmensdorf ZH?
- Wasserversorgung Birmensdorf ZH publishes a total hardness of 35 °fH for the supply zone Zone Berg — that corresponds to 19.6 °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 Birmensdorf ZH?
- Wasserversorgung Birmensdorf ZH publishes a nitrate value of 14.5 mg/l for the supply zone Zone Berg. The statutory parametric value is 40 mg/l; the measured value represents 36 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
- Who supplies the drinking water in Birmensdorf ZH?
- Wasserversorgung Birmensdorf ZH. The values shown here come from the supply zone Zone Berg 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.