Drinking water in Untersiggenthal
One supply zone, water supplier: Wasserversorgung Untersiggenthal.
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.
Assigned 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 31/12/2024. 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 | 8.9 mg/l | 40 mg/l | 22 % | Mean · Aargau |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Aargau |
| Sulphate | 31.2 mg/l | — | — | Mean · Aargau |
| Sodium | 5.5 mg/l | 200 mg/l | 3 % | Mean · Aargau |
Show all recorded parameters (19 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 3 KBE/ml | 300 1/ml | — | Mean · Aargau |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Aargau |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Aargau |
Chemical parameters (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Fluoride | 0.1 mg/l | 1.5 mg/l | 7 % | Mean · Aargau |
| Nitrate | 8.9 mg/l | 40 mg/l | 22 % | Mean · Aargau |
Metabolites (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorothalonil metabolite R417888 | 0.02 µg/l | 0.1 µg/l | 20 % | Mean · Aargau |
| Chlorothalonil metabolite R471811 | 0.048 µg/l | 0.1 µg/l | 48 % | Mean · Aargau |
Indicator parameters (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 11.3 mg/l | — | — | Mean · Aargau |
| Conductivity (25 °C) | 608 µS/cm | — | — | Mean · Aargau |
| pH | 7.39 | — | — | Mean · Aargau |
| Sodium | 5.5 mg/l | 200 mg/l | 3 % | Mean · Aargau |
| Sulphate | 31.2 mg/l | — | — | Mean · Aargau |
| Temperature | 12.5 °C | — | — | Mean · Aargau |
| Turbidity | 0.1 TE/F | — | — | Mean · Aargau |
Further parameters (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 91.25 mg/l | — | — | Mean · Aargau |
| Dissolved organic carbon (DOC) | 0.35 mg/l | — | — | Mean · Aargau |
| Magnesium | 21.4 mg/l | — | — | Mean · Aargau |
| Potassium | 0.9 mg/l | — | — | Mean · Aargau |
| Total hardness | 25 °fH | — | — | Mean · Aargau |
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: 5417
Frequently asked questions about drinking water in Untersiggenthal
- How hard is the water in Untersiggenthal?
- Wasserversorgung Untersiggenthal publishes a total hardness of 25 °fH for the supply zone Aargau — that corresponds to 14 °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: 2024, retrieved on 07/08/2026.
- How much nitrate is in the drinking water in Untersiggenthal?
- Wasserversorgung Untersiggenthal publishes a nitrate value of 8.9 mg/l for the supply zone Aargau. The statutory parametric value is 40 mg/l; the measured value represents 22 % of the parametric value. Basis: 2024, retrieved on 07/08/2026.
- Who supplies the drinking water in Untersiggenthal?
- Wasserversorgung Untersiggenthal. The values shown here come from the supply zone Aargau 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.