How hard is the water in Weiach?

Gemeinde Weiach publishes a total hardness of 32.4 °fH for the supply zone Weiach — that corresponds to 18.1 °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: 2026, retrieved on 07/08/2026.

How much nitrate is in the drinking water in Weiach?

Gemeinde Weiach publishes a nitrate value of 12.1 mg/l for the supply zone Weiach. The statutory parametric value is 40 mg/l; the measured value represents 30 % of the parametric value. Basis: 2026, retrieved on 07/08/2026.

Who supplies the drinking water in Weiach?

Gemeinde Weiach. The values shown here come from the supply zone Weiach 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 Weiach

One supply zone, water supplier: Gemeinde Weiach.

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.

Weiach

Gemeinde Weiach

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

Water hardness

18.1 °dH

Hardness range hard

Key values Weiach
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	12.1 mg/l	40 mg/l	30 %	Mean · Weiach
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Weiach
Sulphate	20.1 mg/l	—	—	Mean · Weiach
Sodium	4.9 mg/l	200 mg/l	2 %	Mean · Weiach

Show all recorded parameters (18 — most recent value per parameter)

Microbiology (3)

Microbiology – Weiach
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	43.1 KBE/ml	300 1/ml	—	Mean · Weiach
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Weiach
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Weiach

Chemical parameters (2)

Chemical parameters – Weiach
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0.1 mg/l	1.5 mg/l	7 %	Mean · Weiach
Nitrate	12.1 mg/l	40 mg/l	30 %	Mean · Weiach

Metabolites (2)

Metabolites – Weiach
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	0.028 µg/l	0.1 µg/l	28 %	Mean · Weiach
Chlorothalonil metabolite R471811	0.18 µg/l	0.1 µg/l	180 % Mean above the parametric value	Mean · Weiach

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 (6)

Indicator parameters – Weiach
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	6.4 mg/l	—	—	Mean · Weiach
Conductivity (25 °C)	541.8 µS/cm	—	—	Mean · Weiach
pH	7.4	—	—	Mean · Weiach
Sodium	4.9 mg/l	200 mg/l	2 %	Mean · Weiach
Sulphate	20.1 mg/l	—	—	Mean · Weiach
Temperature	12 °C	—	—	Mean · Weiach

Further parameters (5)

Further parameters – Weiach
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	95 mg/l	—	—	Mean · Weiach
Magnesium	21.2 mg/l	—	—	Mean · Weiach
Potassium	1.8 mg/l	—	—	Mean · Weiach
Spectral absorption coefficient 254 nm (SAC 254)	0.7 1/m	—	—	Mean · Weiach
Total hardness	32.4 °fH	—	—	Mean · Weiach

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/1133/gemeinde-weiach/3411/weiach · 2026 · 2026 · retrieved on 07/08/2026

Postcodes in this zone: 8187

Frequently asked questions about drinking water in Weiach

How hard is the water in Weiach?: Gemeinde Weiach publishes a total hardness of 32.4 °fH for the supply zone Weiach — that corresponds to 18.1 °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: 2026, retrieved on 07/08/2026.
How much nitrate is in the drinking water in Weiach?: Gemeinde Weiach publishes a nitrate value of 12.1 mg/l for the supply zone Weiach. The statutory parametric value is 40 mg/l; the measured value represents 30 % of the parametric value. Basis: 2026, retrieved on 07/08/2026.
Who supplies the drinking water in Weiach?: Gemeinde Weiach. The values shown here come from the supply zone Weiach 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.