Drinking water in Benken ZH
2 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.
Benken ZH, Oerlingen, Marthalen, Trüllikon
GWK Gruppenwasserversorgung KohlfirstAssigned 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 | 4.6 mg/l | 40 mg/l | 12 % | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Sulphate | 30.2 mg/l | — | — | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Sodium | 5.3 mg/l | 200 mg/l | 3 % | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
Show all recorded parameters (16 — 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 · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Intestinal enterococci | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Benken ZH, Oerlingen, Marthalen, Trüllikon |
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 · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Nitrate | 4.6 mg/l | 40 mg/l | 12 % | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
* 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.
Metabolites (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorothalonil metabolite R417888 | < 0.005 µg/l below limit of quantification | 0.1 µg/l | < 5 % * | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Chlorothalonil metabolite R471811 | < 0.05 µg/l below limit of quantification | 0.1 µg/l | < 50 % * | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
* 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 (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 6.9 mg/l | — | — | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| pH | 7.7 | — | — | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Sodium | 5.3 mg/l | 200 mg/l | 3 % | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Sulphate | 30.2 mg/l | — | — | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Temperature | 12.4 °C | — | — | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 64.1 mg/l | — | — | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Magnesium | 12.5 mg/l | — | — | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Potassium | 1.3 mg/l | — | — | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
| Total hardness | 21.3 °fH | — | — | Mean · Benken ZH, Oerlingen, Marthalen, Trüllikon |
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: 8463
Show 1 more supply zone
Dachsen, Laufen-Uhwiesen
GWK Gruppenwasserversorgung KohlfirstAssigned 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 | 3.6 mg/l | 40 mg/l | 9 % | Mean · Dachsen, Laufen-Uhwiesen |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Dachsen, Laufen-Uhwiesen |
| Sulphate | 32.5 mg/l | — | — | Mean · Dachsen, Laufen-Uhwiesen |
| Sodium | 6.3 mg/l | 200 mg/l | 3 % | Mean · Dachsen, Laufen-Uhwiesen |
Show all recorded parameters (16 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 2.4 KBE/ml | 300 1/ml | — | Mean · Dachsen, Laufen-Uhwiesen |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Dachsen, Laufen-Uhwiesen |
| Intestinal enterococci | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Dachsen, Laufen-Uhwiesen |
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 · Dachsen, Laufen-Uhwiesen |
| Nitrate | 3.6 mg/l | 40 mg/l | 9 % | Mean · Dachsen, Laufen-Uhwiesen |
* 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.
Metabolites (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorothalonil metabolite R417888 | < 0.005 µg/l below limit of quantification | 0.1 µg/l | < 5 % * | Mean · Dachsen, Laufen-Uhwiesen |
| Chlorothalonil metabolite R471811 | < 0.05 µg/l below limit of quantification | 0.1 µg/l | < 50 % * | Mean · Dachsen, Laufen-Uhwiesen |
* 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 (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 8.7 mg/l | — | — | Mean · Dachsen, Laufen-Uhwiesen |
| pH | 7.8 | — | — | Mean · Dachsen, Laufen-Uhwiesen |
| Sodium | 6.3 mg/l | 200 mg/l | 3 % | Mean · Dachsen, Laufen-Uhwiesen |
| Sulphate | 32.5 mg/l | — | — | Mean · Dachsen, Laufen-Uhwiesen |
| Temperature | 14.7 °C | — | — | Mean · Dachsen, Laufen-Uhwiesen |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 52.5 mg/l | — | — | Mean · Dachsen, Laufen-Uhwiesen |
| Magnesium | 9.5 mg/l | — | — | Mean · Dachsen, Laufen-Uhwiesen |
| Potassium | 2 mg/l | — | — | Mean · Dachsen, Laufen-Uhwiesen |
| Total hardness | 17.2 °fH | — | — | Mean · Dachsen, Laufen-Uhwiesen |
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: 8463
Frequently asked questions about drinking water in Benken ZH
- How hard is the water in Benken ZH?
- GWK Gruppenwasserversorgung Kohlfirst publishes a total hardness of 21.3 °fH for the supply zone Benken ZH, Oerlingen, Marthalen, Trüllikon — that corresponds to 11.9 °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 Benken ZH?
- GWK Gruppenwasserversorgung Kohlfirst publishes a nitrate value of 4.6 mg/l for the supply zone Benken ZH, Oerlingen, Marthalen, Trüllikon. The statutory parametric value is 40 mg/l; the measured value represents 12 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
- Who supplies the drinking water in Benken ZH?
- GWK Gruppenwasserversorgung Kohlfirst. The values shown here come from the supply zone Benken ZH, Oerlingen, Marthalen, Trüllikon 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.