How hard is the water in Wallisellen?

die werke versorgung wallisellen ag publishes a total hardness of 30.53 °fH for the supply zone Wallisellen — that corresponds to 17.1 °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 Wallisellen?

die werke versorgung wallisellen ag publishes a nitrate value of 10.62 mg/l for the supply zone Wallisellen. The statutory parametric value is 40 mg/l; the measured value represents 27 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Wallisellen?

die werke versorgung wallisellen ag. The values shown here come from the supply zone Wallisellen 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.

Drinking water in Wallisellen

One supply zone, water supplier: die werke versorgung wallisellen 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.

Wallisellen

die werke versorgung wallisellen ag

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness

17.1 °dH

Hardness range hard

Key values Wallisellen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	10.62 mg/l	40 mg/l	27 %	Mean · Wallisellen
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Wallisellen

Show all recorded parameters (11 — most recent value per parameter)

Microbiology (3)

Microbiology – Wallisellen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	4.72 KBE/ml	300 1/ml	—	Mean · Wallisellen
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Wallisellen
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Wallisellen

Chemical parameters (1)

Chemical parameters – Wallisellen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	10.62 mg/l	40 mg/l	27 %	Mean · Wallisellen

Metabolites (2)

Metabolites – Wallisellen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	0.049 µg/l	0.1 µg/l	49 %	Mean · Wallisellen
Chlorothalonil metabolite R471811	0.063 µg/l	0.1 µg/l	63 %	Mean · Wallisellen

Indicator parameters (2)

Indicator parameters – Wallisellen
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7.39	—	—	Mean · Wallisellen
Temperature	12.77 °C	—	—	Mean · Wallisellen

Further parameters (3)

Further parameters – Wallisellen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	91.26 mg/l	—	—	Mean · Wallisellen
Magnesium	18.81 mg/l	—	—	Mean · Wallisellen
Total hardness	30.53 °fH	—	—	Mean · Wallisellen

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/955/die-werke-versorgung-wallisellen-ag/3083/wallisellen · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8304

Frequently asked questions about drinking water in Wallisellen

How hard is the water in Wallisellen?: die werke versorgung wallisellen ag publishes a total hardness of 30.53 °fH for the supply zone Wallisellen — that corresponds to 17.1 °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 Wallisellen?: die werke versorgung wallisellen ag publishes a nitrate value of 10.62 mg/l for the supply zone Wallisellen. The statutory parametric value is 40 mg/l; the measured value represents 27 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Wallisellen?: die werke versorgung wallisellen ag. The values shown here come from the supply zone Wallisellen 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.