Drinking water in Niederwil SG
One supply zone, water supplier: Wasserversorgung Oberbüren (WVO).
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.
Wasserversorgung Oberbüren
Wasserversorgung Oberbüren (WVO)Assigned 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 | 23.5 mg/l | 40 mg/l | 59 % | Mean · Wasserversorgung Oberbüren |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Wasserversorgung Oberbüren |
| Sulphate | 8 mg/l | — | — | Mean · Wasserversorgung Oberbüren |
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 | 12.3 KBE/ml | 300 1/ml | — | Mean · Wasserversorgung Oberbüren |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Wasserversorgung Oberbüren |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Wasserversorgung Oberbüren |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 23.5 mg/l | 40 mg/l | 59 % | Mean · Wasserversorgung Oberbüren |
PFAS (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorohexane sulfonic acid (PFHxS) | 0 µg/l | 0.3 µg/l | 0 % | Mean · Wasserversorgung Oberbüren |
| Perfluorooctanesulfonic acid (PFOS) | 0 µg/l | 0.3 µg/l | 0 % | Mean · Wasserversorgung Oberbüren |
| Perfluorooctanoic acid (PFOA) | 0 µg/l | 0.5 µg/l | 0 % | Mean · Wasserversorgung Oberbüren |
Metabolites (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorothalonil metabolite R417888 | < 0.02 µg/l below limit of quantification | 0.1 µg/l | < 20 % * | Mean · Wasserversorgung Oberbüren |
| Chlorothalonil metabolite R471811 | 0 µg/l | 0.1 µg/l | 0 % | Mean · Wasserversorgung Oberbüren |
* 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 | 9.5 mg/l | — | — | Mean · Wasserversorgung Oberbüren |
| Conductivity (25 °C) | 583 µS/cm | — | — | Mean · Wasserversorgung Oberbüren |
| Sulphate | 8 mg/l | — | — | Mean · Wasserversorgung Oberbüren |
| Temperature | 12.7 °C | — | — | Mean · Wasserversorgung Oberbüren |
| Turbidity | 0.2 TE/F | — | — | Mean · Wasserversorgung Oberbüren |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 121.5 mg/l | — | — | Mean · Wasserversorgung Oberbüren |
| Magnesium | 20 mg/l | — | — | Mean · Wasserversorgung Oberbüren |
| Total hardness | 38.5 °fH | — | — | Mean · Wasserversorgung Oberbüren |
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: 9203
Frequently asked questions about drinking water in Niederwil SG
- How hard is the water in Niederwil SG?
- Wasserversorgung Oberbüren (WVO) publishes a total hardness of 38.5 °fH for the supply zone Wasserversorgung Oberbüren — that corresponds to 21.6 °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 Niederwil SG?
- Wasserversorgung Oberbüren (WVO) publishes a nitrate value of 23.5 mg/l for the supply zone Wasserversorgung Oberbüren. The statutory parametric value is 40 mg/l; the measured value represents 59 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
- Who supplies the drinking water in Niederwil SG?
- Wasserversorgung Oberbüren (WVO). The values shown here come from the supply zone Wasserversorgung Oberbüren 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.