Drinking water in Oetwil am See
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.
obere Druckzone
Wasserversorgung Oetwil am SeeAssigned 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 | 2.8 mg/l | 40 mg/l | 7 % | Mean · obere Druckzone |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · obere Druckzone |
| Sulphate | 14.1 mg/l | — | — | Mean · obere Druckzone |
| Sodium | 4.1 mg/l | 200 mg/l | 2 % | Mean · obere Druckzone |
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 | 16.6 KBE/ml | 300 1/ml | — | Mean · obere Druckzone |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · obere Druckzone |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · obere Druckzone |
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 · obere Druckzone |
| Nitrate | 2.8 mg/l | 40 mg/l | 7 % | Mean · obere Druckzone |
* 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 | 5.3 mg/l | — | — | Mean · obere Druckzone |
| pH | 7.7 | — | — | Mean · obere Druckzone |
| Sodium | 4.1 mg/l | 200 mg/l | 2 % | Mean · obere Druckzone |
| Sulphate | 14.1 mg/l | — | — | Mean · obere Druckzone |
| Temperature | 12.1 °C | — | — | Mean · obere Druckzone |
Further parameters (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 49.6 mg/l | — | — | Mean · obere Druckzone |
| Hydrogen carbonate | 13.5 mg/l | — | — | Mean · obere Druckzone |
| Magnesium | 6.2 mg/l | — | — | Mean · obere Druckzone |
| Potassium | 1.1 mg/l | — | — | Mean · obere Druckzone |
| Total hardness | 14.9 °fH | — | — | Mean · obere Druckzone |
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: 8618
Show 1 more supply zone
untere Druckzone
Wasserversorgung Oetwil am SeeAssigned 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 | 2.8 mg/l | 40 mg/l | 7 % | Mean · untere Druckzone |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · untere Druckzone |
| Sulphate | 14.1 mg/l | — | — | Mean · untere Druckzone |
| Sodium | 4.1 mg/l | 200 mg/l | 2 % | Mean · untere Druckzone |
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 · untere Druckzone |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · untere Druckzone |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · untere Druckzone |
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 · untere Druckzone |
| Nitrate | 2.8 mg/l | 40 mg/l | 7 % | Mean · untere Druckzone |
* 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 | 5.4 mg/l | — | — | Mean · untere Druckzone |
| pH | 7.8 | — | — | Mean · untere Druckzone |
| Sodium | 4.1 mg/l | 200 mg/l | 2 % | Mean · untere Druckzone |
| Sulphate | 14.1 mg/l | — | — | Mean · untere Druckzone |
| Temperature | 11.7 °C | — | — | Mean · untere Druckzone |
Further parameters (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 49.9 mg/l | — | — | Mean · untere Druckzone |
| Hydrogen carbonate | 13.5 mg/l | — | — | Mean · untere Druckzone |
| Magnesium | 6 mg/l | — | — | Mean · untere Druckzone |
| Potassium | 1.1 mg/l | — | — | Mean · untere Druckzone |
| Total hardness | 14.9 °fH | — | — | Mean · untere Druckzone |
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: 8618
Frequently asked questions about drinking water in Oetwil am See
- How hard is the water in Oetwil am See?
- Wasserversorgung Oetwil am See publishes a total hardness of 14.9 °fH for the supply zone obere Druckzone — 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 Oetwil am See?
- Wasserversorgung Oetwil am See publishes a nitrate value of 2.8 mg/l for the supply zone obere Druckzone. 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 Oetwil am See?
- Wasserversorgung Oetwil am See. The values shown here come from the supply zone obere Druckzone 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.