How hard is the water in Widnau?

Gemeindeverwaltung Widnau, Wasserversorgung publishes a total hardness of 20.5 °fH for the supply zone Widnau — that corresponds to 11.5 °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 Widnau?

Gemeindeverwaltung Widnau, Wasserversorgung publishes a nitrate value of 2 mg/l for the supply zone Widnau. The statutory parametric value is 40 mg/l; the measured value represents 5 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Widnau?

Gemeindeverwaltung Widnau, Wasserversorgung. The values shown here come from the supply zone Widnau 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 Widnau

One supply zone, water supplier: Gemeindeverwaltung Widnau, Wasserversorgung.

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.

Widnau

Gemeindeverwaltung Widnau, Wasserversorgung

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

Water hardness

11.5 °dH

Hardness range medium

Key values Widnau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	2 mg/l	40 mg/l	5 %	Mean · Widnau
Escherichia coli (E. coli)	1 KBE/100ml	0/100 ml	above the parametric value — this parameter must not be detectable	Maximum · Median 0 · Widnau
Sulphate	65 mg/l	—	—	Mean · Widnau

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 (15 — most recent value per parameter)

Microbiology (3)

Microbiology – Widnau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	1.6 KBE/ml	300 1/ml	—	Mean · Widnau
Escherichia coli (E. coli)	1 KBE/100ml	0/100 ml	above the parametric value — this parameter must not be detectable	Maximum · Median 0 · Widnau
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Widnau

Chemical parameters (1)

Chemical parameters – Widnau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	2 mg/l	40 mg/l	5 %	Mean · Widnau

Indicator parameters (7)

Indicator parameters – Widnau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	6 mg/l	—	—	Mean · Widnau
Conductivity (25 °C)	395 µS/cm	—	—	Mean · Widnau
Iron	0.001 mg/l	0.2 mg/l	0.5 %	Mean · Widnau
Manganese	0.0001 mg/l	50 µg/l	0.2 %	Mean · Widnau
pH	7.5	—	—	Mean · Widnau
Sulphate	65 mg/l	—	—	Mean · Widnau
Temperature	12.9 °C	—	—	Mean · Widnau

Further parameters (4)

Further parameters – Widnau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	62 mg/l	—	—	Mean · Widnau
Dissolved organic carbon (DOC)	0.26 mg/l	—	—	Mean · Widnau
Magnesium	12 mg/l	—	—	Mean · Widnau
Total hardness	20.5 °fH	—	—	Mean · Widnau

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/1612/gemeindeverwaltung-widnau-wasserversorgung/3660/widnau · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 9443

Frequently asked questions about drinking water in Widnau

How hard is the water in Widnau?: Gemeindeverwaltung Widnau, Wasserversorgung publishes a total hardness of 20.5 °fH for the supply zone Widnau — that corresponds to 11.5 °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 Widnau?: Gemeindeverwaltung Widnau, Wasserversorgung publishes a nitrate value of 2 mg/l for the supply zone Widnau. The statutory parametric value is 40 mg/l; the measured value represents 5 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Widnau?: Gemeindeverwaltung Widnau, Wasserversorgung. The values shown here come from the supply zone Widnau 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.