Drinking water in Stäfa
5 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.
Gruppenwasserversorgung Zürcher Oberland AG
Gruppenwasserversorgung Zürcher Oberland AGAssigned 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 | 2.7 mg/l | 40 mg/l | 7 % | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Gruppenwasserversorgung Zürcher Oberland AG |
| Sulphate | 14.2 mg/l | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Sodium | 4.2 mg/l | 200 mg/l | 2 % | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
Show all recorded parameters (17 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 1 KBE/ml | 300 1/ml | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Gruppenwasserversorgung Zürcher Oberland AG |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Gruppenwasserversorgung Zürcher Oberland AG |
Chemical parameters (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Fluoride | 0 mg/l | 1.5 mg/l | 0 % | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Nitrate | 2.7 mg/l | 40 mg/l | 7 % | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
Indicator parameters (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 5.7 mg/l | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Conductivity (25 °C) | 297 µS/cm | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| pH | 7.8 | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Sodium | 4.2 mg/l | 200 mg/l | 2 % | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Sulphate | 14.2 mg/l | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Temperature | 7.9 °C | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Turbidity | 0 TE/F | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
Further parameters (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 48.9 mg/l | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Magnesium | 6.1 mg/l | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Potassium | 1.1 mg/l | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Spectral absorption coefficient 254 nm (SAC 254) | 1.1 1/m | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
| Total hardness | 14.8 °fH | — | — | Mean · Gruppenwasserversorgung Zürcher Oberland AG |
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: 8712
Show 4 more supply zones
Stäfa: Bergzone (Zone3)
Gemeindewerke StäfaAssigned 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 31/12/2022. 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 | 2.7 mg/l | 40 mg/l | 7 % | Mean · Stäfa: Bergzone (Zone3) |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Bergzone (Zone3) |
| Sulphate | 10.95 mg/l | — | — | Mean · Stäfa: Bergzone (Zone3) |
Show all recorded parameters (11 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 12.6 KBE/ml | 300 1/ml | — | Mean · Stäfa: Bergzone (Zone3) |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Bergzone (Zone3) |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Bergzone (Zone3) |
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 · Stäfa: Bergzone (Zone3) |
| Nitrate | 2.7 mg/l | 40 mg/l | 7 % | Mean · Stäfa: Bergzone (Zone3) |
* 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 (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 6.4 mg/l | — | — | Mean · Stäfa: Bergzone (Zone3) |
| Sulphate | 10.95 mg/l | — | — | Mean · Stäfa: Bergzone (Zone3) |
| Temperature | 9.7 °C | — | — | Mean · Stäfa: Bergzone (Zone3) |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 49.2 mg/l | — | — | Mean · Stäfa: Bergzone (Zone3) |
| Magnesium | 5.9 mg/l | — | — | Mean · Stäfa: Bergzone (Zone3) |
| Total hardness | 14.7 °fH | — | — | Mean · Stäfa: Bergzone (Zone3) |
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: 8712
Stäfa: Obere Versorgungszone (Zone 2)
Gemeindewerke StäfaAssigned 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 31/12/2022. 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 | 4.6 mg/l | 40 mg/l | 12 % | Mean · Stäfa: Obere Versorgungszone (Zone 2) |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Obere Versorgungszone (Zone 2) |
| Sulphate | 2.1 mg/l | — | — | Mean · Stäfa: Obere Versorgungszone (Zone 2) |
Show all recorded parameters (12 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 20.5 KBE/ml | 300 1/ml | — | Mean · Stäfa: Obere Versorgungszone (Zone 2) |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Obere Versorgungszone (Zone 2) |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Obere Versorgungszone (Zone 2) |
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 · Stäfa: Obere Versorgungszone (Zone 2) |
| Nitrate | 4.6 mg/l | 40 mg/l | 12 % | Mean · Stäfa: Obere Versorgungszone (Zone 2) |
* 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 (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 3.7 mg/l | — | — | Mean · Stäfa: Obere Versorgungszone (Zone 2) |
| pH | 7.6 | — | — | Mean · Stäfa: Obere Versorgungszone (Zone 2) |
| Sulphate | 2.1 mg/l | — | — | Mean · Stäfa: Obere Versorgungszone (Zone 2) |
| Temperature | 9.7 °C | — | — | Mean · Stäfa: Obere Versorgungszone (Zone 2) |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 70.9 mg/l | — | — | Mean · Stäfa: Obere Versorgungszone (Zone 2) |
| Magnesium | 15.3 mg/l | — | — | Mean · Stäfa: Obere Versorgungszone (Zone 2) |
| Total hardness | 24 °fH | — | — | Mean · Stäfa: Obere Versorgungszone (Zone 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: 8712
Stäfa: Redlikon (Zone4)
Gemeindewerke StäfaAssigned 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 31/12/2022. 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 | 2.7 mg/l | 40 mg/l | 7 % | Mean · Stäfa: Redlikon (Zone4) |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Redlikon (Zone4) |
| Sulphate | 13.8 mg/l | — | — | Mean · Stäfa: Redlikon (Zone4) |
Show all recorded parameters (12 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 38.8 KBE/ml | 300 1/ml | — | Mean · Stäfa: Redlikon (Zone4) |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Redlikon (Zone4) |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Redlikon (Zone4) |
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 · Stäfa: Redlikon (Zone4) |
| Nitrate | 2.7 mg/l | 40 mg/l | 7 % | Mean · Stäfa: Redlikon (Zone4) |
* 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 (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 6.4 mg/l | — | — | Mean · Stäfa: Redlikon (Zone4) |
| pH | 8 | — | — | Mean · Stäfa: Redlikon (Zone4) |
| Sulphate | 13.8 mg/l | — | — | Mean · Stäfa: Redlikon (Zone4) |
| Temperature | 8.9 °C | — | — | Mean · Stäfa: Redlikon (Zone4) |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 48.97 mg/l | — | — | Mean · Stäfa: Redlikon (Zone4) |
| Magnesium | 5.8 mg/l | — | — | Mean · Stäfa: Redlikon (Zone4) |
| Total hardness | 14.6 °fH | — | — | Mean · Stäfa: Redlikon (Zone4) |
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: 8712
Stäfa: Untere Versorgungszone (Zone 1)
Gemeindewerke StäfaAssigned 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 31/12/2022. 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 | 3.2 mg/l | 40 mg/l | 8 % | Mean · Stäfa: Untere Versorgungszone (Zone 1) |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Untere Versorgungszone (Zone 1) |
| Sulphate | 10.6 mg/l | — | — | Mean · Stäfa: Untere Versorgungszone (Zone 1) |
Show all recorded parameters (12 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 32 KBE/ml | 300 1/ml | — | Mean · Stäfa: Untere Versorgungszone (Zone 1) |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Untere Versorgungszone (Zone 1) |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stäfa: Untere Versorgungszone (Zone 1) |
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 · Stäfa: Untere Versorgungszone (Zone 1) |
| Nitrate | 3.2 mg/l | 40 mg/l | 8 % | Mean · Stäfa: Untere Versorgungszone (Zone 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 (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 5.3 mg/l | — | — | Mean · Stäfa: Untere Versorgungszone (Zone 1) |
| pH | 7.8 | — | — | Mean · Stäfa: Untere Versorgungszone (Zone 1) |
| Sulphate | 10.6 mg/l | — | — | Mean · Stäfa: Untere Versorgungszone (Zone 1) |
| Temperature | 9.2 °C | — | — | Mean · Stäfa: Untere Versorgungszone (Zone 1) |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 56.3 mg/l | — | — | Mean · Stäfa: Untere Versorgungszone (Zone 1) |
| Magnesium | 8.1 mg/l | — | — | Mean · Stäfa: Untere Versorgungszone (Zone 1) |
| Total hardness | 17.4 °fH | — | — | Mean · Stäfa: Untere Versorgungszone (Zone 1) |
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: 8712
Frequently asked questions about drinking water in Stäfa
- How hard is the water in Stäfa?
- Gruppenwasserversorgung Zürcher Oberland AG publishes a total hardness of 14.8 °fH for the supply zone Gruppenwasserversorgung Zürcher Oberland AG — that corresponds to 8.3 °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 Stäfa?
- Gruppenwasserversorgung Zürcher Oberland AG publishes a nitrate value of 2.7 mg/l for the supply zone Gruppenwasserversorgung Zürcher Oberland AG. The statutory parametric value is 40 mg/l; the measured value represents 7 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
- Who supplies the drinking water in Stäfa?
- Gruppenwasserversorgung Zürcher Oberland AG. The values shown here come from the supply zone Gruppenwasserversorgung Zürcher Oberland AG 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.