Drinking water in Lengnau BE
One supply zone, water supplier: Wasserversorgung Lengnau BE.
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.
Gemeindegebiet Lengnau BE
Wasserversorgung Lengnau BEAssigned 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 | 4.5 mg/l | 40 mg/l | 11 % | Mean · Gemeindegebiet Lengnau BE |
| Escherichia coli (E. coli) | 2 KBE/100ml | 0/100 ml | above the parametric value — this parameter must not be detectable | Maximum · Median 0 · Gemeindegebiet Lengnau BE |
| Sulphate | 3.8 mg/l | — | — | Mean · Gemeindegebiet Lengnau BE |
| Sodium | 3.9 mg/l | 200 mg/l | 2 % | Mean · Gemeindegebiet Lengnau BE |
An exceedance of a parametric value does not automatically mean a health risk; the statutory parametric values include safety margins. Assessment and any measures are the responsibility of the competent health authority of the respective country.
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 | 13.4 KBE/ml | 300 1/ml | — | Mean · Gemeindegebiet Lengnau BE |
| Escherichia coli (E. coli) | 2 KBE/100ml | 0/100 ml | above the parametric value — this parameter must not be detectable | Maximum · Median 0 · Gemeindegebiet Lengnau BE |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Gemeindegebiet Lengnau BE |
An exceedance of a parametric value does not automatically mean a health risk; the statutory parametric values include safety margins. Assessment and any measures are the responsibility of the competent health authority of the respective country.
Chemical parameters (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Fluoride | < 0.08 mg/l below limit of quantification | 1.5 mg/l | < 5 % * | Mean · Gemeindegebiet Lengnau BE |
| Nitrate | 4.5 mg/l | 40 mg/l | 11 % | Mean · Gemeindegebiet Lengnau BE |
* 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.
PFAS (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorohexane sulfonic acid (PFHxS) | < 0.01 µg/l below limit of quantification | 0.3 µg/l | < 3 % * | Mean · Gemeindegebiet Lengnau BE |
| Perfluorooctanesulfonic acid (PFOS) | < 0.01 µg/l below limit of quantification | 0.3 µg/l | < 3 % * | Mean · Gemeindegebiet Lengnau BE |
| Perfluorooctanoic acid (PFOA) | < 0.01 µg/l below limit of quantification | 0.5 µg/l | < 2 % * | Mean · Gemeindegebiet Lengnau BE |
* 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 | 4.8 mg/l | — | — | Mean · Gemeindegebiet Lengnau BE |
| Sodium | 3.9 mg/l | 200 mg/l | 2 % | Mean · Gemeindegebiet Lengnau BE |
| Sulphate | 3.8 mg/l | — | — | Mean · Gemeindegebiet Lengnau BE |
| Temperature | 10.9 °C | — | — | Mean · Gemeindegebiet Lengnau BE |
| Turbidity | 0.6 TE/F | — | — | Mean · Gemeindegebiet Lengnau BE |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 94.8 mg/l | — | — | Mean · Gemeindegebiet Lengnau BE |
| Magnesium | 7.6 mg/l | — | — | Mean · Gemeindegebiet Lengnau BE |
| Potassium | 0.7 mg/l | — | — | Mean · Gemeindegebiet Lengnau BE |
| Total hardness | 26.7 °fH | — | — | Mean · Gemeindegebiet Lengnau BE |
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: 2543
Frequently asked questions about drinking water in Lengnau BE
- How hard is the water in Lengnau BE?
- Wasserversorgung Lengnau BE publishes a total hardness of 26.7 °fH for the supply zone Gemeindegebiet Lengnau BE — that corresponds to 15 °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 Lengnau BE?
- Wasserversorgung Lengnau BE publishes a nitrate value of 4.5 mg/l for the supply zone Gemeindegebiet Lengnau BE. The statutory parametric value is 40 mg/l; the measured value represents 11 % of the parametric value. Basis: 2026, retrieved on 07/08/2026.
- Who supplies the drinking water in Lengnau BE?
- Wasserversorgung Lengnau BE. The values shown here come from the supply zone Gemeindegebiet Lengnau BE 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.