Drinking water in Bülach
2 supply zones — values can differ depending on the district. Below is the zone with the most documented parameters, the others collapsed underneath. To determine the exact match, look up the postcode.
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.
Stadt Bülach
Wasserversorgung Stadt BülachAssigned 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 mg/l | 40 mg/l | 38 % | Mean · Stadt Bülach |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stadt Bülach |
| Sulphate | 23 mg/l | — | — | Mean · Stadt Bülach |
| Sodium | 20 mg/l | 200 mg/l | 10 % | Mean · Stadt Bülach |
Show all recorded parameters (15 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 25 KBE/ml | 300 1/ml | — | Mean · Stadt Bülach |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Stadt Bülach |
| Intestinal enterococci | 1 KBE/100ml | 0/100 ml | above the parametric value — this parameter must not be detectable | Maximum · Median 0 · Stadt Bülach |
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 (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 15 mg/l | 40 mg/l | 38 % | Mean · Stadt Bülach |
Indicator parameters (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 33 mg/l | — | — | Mean · Stadt Bülach |
| Conductivity (25 °C) | 611 µS/cm | — | — | Mean · Stadt Bülach |
| pH | 7.6 | — | — | Mean · Stadt Bülach |
| Sodium | 20 mg/l | 200 mg/l | 10 % | Mean · Stadt Bülach |
| Sulphate | 23 mg/l | — | — | Mean · Stadt Bülach |
| Temperature | 13.9 °C | — | — | Mean · Stadt Bülach |
Further parameters (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 80 mg/l | — | — | Mean · Stadt Bülach |
| Magnesium | 18 mg/l | — | — | Mean · Stadt Bülach |
| Potassium | 4 mg/l | — | — | Mean · Stadt Bülach |
| Spectral absorption coefficient 254 nm (SAC 254) | 1 1/m | — | — | Mean · Stadt Bülach |
| Total hardness | 27.35 °fH | — | — | Mean · Stadt Bülach |
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: 8180
Show 1 more supply zone
Weiler Heimgarten
Wasserversorgung Stadt BülachAssigned 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 | 10 mg/l | 40 mg/l | 25 % | Mean · Weiler Heimgarten |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Weiler Heimgarten |
| Sulphate | 25 mg/l | — | — | Mean · Weiler Heimgarten |
| Sodium | 3 mg/l | 200 mg/l | 2 % | Mean · Weiler Heimgarten |
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 | 5 KBE/ml | 300 1/ml | — | Mean · Weiler Heimgarten |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Weiler Heimgarten |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Weiler Heimgarten |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 10 mg/l | 40 mg/l | 25 % | Mean · Weiler Heimgarten |
Indicator parameters (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 3 mg/l | — | — | Mean · Weiler Heimgarten |
| Conductivity (25 °C) | 746.27 µS/cm | — | — | Mean · Weiler Heimgarten |
| pH | 7 | — | — | Mean · Weiler Heimgarten |
| Sodium | 3 mg/l | 200 mg/l | 2 % | Mean · Weiler Heimgarten |
| Sulphate | 25 mg/l | — | — | Mean · Weiler Heimgarten |
| Temperature | 11 °C | — | — | Mean · Weiler Heimgarten |
| Turbidity | 0.3 TE/F | — | — | Mean · Weiler Heimgarten |
Further parameters (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 110 mg/l | — | — | Mean · Weiler Heimgarten |
| Dissolved organic carbon (DOC) | 0.69 mg/l | — | — | Mean · Weiler Heimgarten |
| Magnesium | 36 mg/l | — | — | Mean · Weiler Heimgarten |
| Potassium | 1 mg/l | — | — | Mean · Weiler Heimgarten |
| Spectral absorption coefficient 254 nm (SAC 254) | 1.07 1/m | — | — | Mean · Weiler Heimgarten |
| Total hardness | 39 °fH | — | — | Mean · Weiler Heimgarten |
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: 8180
Frequently asked questions about drinking water in Bülach
- How hard is the water in Bülach?
- Wasserversorgung Stadt Bülach publishes a total hardness of 27.35 °fH for the supply zone Stadt Bülach — that corresponds to 15.3 °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 Bülach?
- Wasserversorgung Stadt Bülach publishes a nitrate value of 15 mg/l for the supply zone Stadt Bülach. The statutory parametric value is 40 mg/l; the measured value represents 38 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
- Who supplies the drinking water in Bülach?
- Wasserversorgung Stadt Bülach. The values shown here come from the supply zone Stadt Bülach 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.