Drinking water in Eppenberg, Schönenwerd, Wöschnau
One supply zone, water supplier: Eniwa Wasser AG.
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.
Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG
Eniwa Wasser AGAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
17 °dH
Hardness range hard
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 23 mg/l | 40 mg/l | 57 % | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Sulphate | 16.67 mg/l | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Sodium | 17 mg/l | 200 mg/l | 9 % | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
Show all recorded parameters (20 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 6.64 KBE/ml | 300 1/ml | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Intestinal enterococci | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 23 mg/l | 40 mg/l | 57 % | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
Metabolites (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorothalonil metabolite R417888 | 0.046 µg/l | 0.1 µg/l | 46 % | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Chlorothalonil metabolite R471811 | 0.208 µg/l | 0.1 µg/l | 208 % Mean above the parametric value | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
Annual means and medians are not individual measured values, but the parametric values apply per sample. If a mean lies above it, at least one individual sample was above it — the mean does not say how many, or by how much. That is why this is not reported here as an exceedance of the parametric value. What counts remains the water supplier's publication, which each row links to.
Indicator parameters (8)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 23.87 mg/l | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Iron | 0.01 mg/l | 0.2 mg/l | 5 % | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Manganese | 0.005 mg/l | 50 µg/l | 10 % | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| pH | 7.33 | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Sodium | 17 mg/l | 200 mg/l | 9 % | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Sulphate | 16.67 mg/l | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Temperature | 13.5 °C | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Turbidity | 0.11 TE/F | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
Further parameters (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 102 mg/l | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Dissolved organic carbon (DOC) | 0.43 mg/l | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Hydrogen carbonate | 335.33 mg/l | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Magnesium | 12.27 mg/l | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Potassium | 3.1 mg/l | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
| Total hardness | 30.43 °fH | — | — | Mean · Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG |
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.
Source: https://trinkwasser.ch/de/versorger/713/eniwa-wasser-ag/3309/aarau-kuttigen-eppenberg-woschnau-erlinsbach-ag · 2025 · 2025 · retrieved on 07/08/2026
Postcodes in this zone: 5012
Frequently asked questions about drinking water in Eppenberg, Schönenwerd, Wöschnau
- How hard is the water in Eppenberg, Schönenwerd, Wöschnau?
- Eniwa Wasser AG publishes a total hardness of 30.43 °fH for the supply zone Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG — that corresponds to 17 °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 Eppenberg, Schönenwerd, Wöschnau?
- Eniwa Wasser AG publishes a nitrate value of 23 mg/l for the supply zone Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach AG. The statutory parametric value is 40 mg/l; the measured value represents 57 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
- Who supplies the drinking water in Eppenberg, Schönenwerd, Wöschnau?
- Eniwa Wasser AG. The values shown here come from the supply zone Aarau - Küttigen - Eppenberg-Wöschnau - Erlinsbach 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.