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.

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

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.

Gruppenwasserversorgung Zürcher Oberland AG

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Values available, but not released

We hold evaluated analysis results for this supply zone. They come from the platform trinkwasser.ch of the Swiss Gas and Water Industry Association (SVGW). On 20/08/2026 the SVGW objected in writing to the use of this data for maunawai.info. We comply with this and do not show the values.

The current values of your water supplier are available directly from Gruppenwasserversorgung Zürcher Oberland AG or on trinkwasser.ch.

17 parameters are recorded: Aerobic mesophilic bacteria, Calcium, Chloride, Conductivity (25 °C), Escherichia coli (E. coli), Fluoride, Intestinal enterococci, Magnesium, Nitrate, pH, Potassium, Sodium, Spectral absorption coefficient 254 nm (SAC 254), Sulphate, Temperature, Total hardness, Turbidity. Date of the withheld document: 07/08/2026.

Postcodes in this zone: 8712

Show 4 more supply zones

Stäfa: Bergzone (Zone3)

Gemeindewerke Stäfa

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Values available, but not released

The current values of your water supplier are available directly from Gemeindewerke Stäfa or on trinkwasser.ch.

11 parameters are recorded: Aerobic mesophilic bacteria, Calcium, Chloride, Escherichia coli (E. coli), Fluoride, Intestinal enterococci, Magnesium, Nitrate, Sulphate, Temperature, Total hardness. Date of the withheld document: 07/08/2026.

Postcodes in this zone: 8712

Stäfa: Obere Versorgungszone (Zone 2)

Gemeindewerke Stäfa

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Values available, but not released

The current values of your water supplier are available directly from Gemeindewerke Stäfa or on trinkwasser.ch.

12 parameters are recorded: Aerobic mesophilic bacteria, Calcium, Chloride, Escherichia coli (E. coli), Fluoride, Intestinal enterococci, Magnesium, Nitrate, pH, Sulphate, Temperature, Total hardness. Date of the withheld document: 07/08/2026.

Postcodes in this zone: 8712

Stäfa: Redlikon (Zone4)

Gemeindewerke Stäfa

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Values available, but not released

The current values of your water supplier are available directly from Gemeindewerke Stäfa or on trinkwasser.ch.

Postcodes in this zone: 8712

Stäfa: Untere Versorgungszone (Zone 1)

Gemeindewerke Stäfa

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Values available, but not released

The current values of your water supplier are available directly from Gemeindewerke Stäfa or on trinkwasser.ch.

Postcodes in this zone: 8712

Frequently asked questions about drinking water in Stäfa

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.