Drinking water in Arch
One supply zone, water supplier: Einwohnergemeinde Arch.
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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 15.2 mg/l | 40 mg/l | 38 % | Mean · Arch |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Arch |
| Sulphate | 11.9 mg/l | — | — | Mean · Arch |
| Sodium | 5.7 mg/l | 200 mg/l | 3 % | Mean · Arch |
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 · Arch |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Arch |
| Intestinal enterococci | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Arch |
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 · Arch |
| Nitrate | 15.2 mg/l | 40 mg/l | 38 % | Mean · Arch |
* 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 | < 0.02 µg/l below limit of quantification | 0.1 µg/l | < 20 % * | Mean · Arch |
| Chlorothalonil metabolite R471811 | 0.11 µg/l | 0.1 µg/l | 110 % Mean above the parametric value | Mean · Arch |
* 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.
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 (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 6.4 mg/l | — | — | Mean · Arch |
| pH | 7.5 | — | — | Mean · Arch |
| Sodium | 5.7 mg/l | 200 mg/l | 3 % | Mean · Arch |
| Sulphate | 11.9 mg/l | — | — | Mean · Arch |
| Temperature | 9.7 °C | — | — | Mean · Arch |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 106 mg/l | — | — | Mean · Arch |
| Magnesium | 6.6 mg/l | — | — | Mean · Arch |
| Potassium | 0.55 mg/l | — | — | Mean · Arch |
| Total hardness | 29.2 °fH | — | — | Mean · Arch |
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: 3296
Frequently asked questions about drinking water in Arch
- How hard is the water in Arch?
- Einwohnergemeinde Arch publishes a total hardness of 29.2 °fH for the supply zone Arch — that corresponds to 16.4 °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: 2026, retrieved on 07/08/2026.
- How much nitrate is in the drinking water in Arch?
- Einwohnergemeinde Arch publishes a nitrate value of 15.2 mg/l for the supply zone Arch. The statutory parametric value is 40 mg/l; the measured value represents 38 % of the parametric value. Basis: 2026, retrieved on 07/08/2026.
- Who supplies the drinking water in Arch?
- Einwohnergemeinde Arch. The values shown here come from the supply zone Arch 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.