How hard is the water in Weyer, Altenmarkt bei Sankt Gallen, Sankt Gallen?

Knonau publishes a total hardness of 32.5 °fH for the supply zone Gemeinde Knonau — that corresponds to 18.2 °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 Weyer, Altenmarkt bei Sankt Gallen, Sankt Gallen?

Knonau publishes a nitrate value of 17.7 mg/l for the supply zone Gemeinde Knonau. The statutory parametric value is 40 mg/l; the measured value represents 44 % of the parametric value. Basis: 2026, retrieved on 07/08/2026.

Drinking water in Weyer, Altenmarkt bei Sankt Gallen, Sankt Gallen

Q: Who supplies the drinking water in Weyer, Altenmarkt bei Sankt Gallen, Sankt Gallen?

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

One supply zone, water supplier: Knonau.

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.

Gemeinde Knonau

Knonau

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

Water hardness

18.2 °dH

Hardness range hard

Key values Gemeinde Knonau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	17.7 mg/l	40 mg/l	44 %	Mean · Gemeinde Knonau
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Gemeinde Knonau
Sulphate	10.2 mg/l	—	—	Mean · Gemeinde Knonau
Sodium	8.9 mg/l	200 mg/l	4 %	Mean · Gemeinde Knonau

Show all recorded parameters (12 — most recent value per parameter)

Microbiology (3)

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

Chemical parameters (1)

Chemical parameters – Gemeinde Knonau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	17.7 mg/l	40 mg/l	44 %	Mean · Gemeinde Knonau

Metabolites (1)

Metabolites – Gemeinde Knonau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R471811	0 µg/l	0.1 µg/l	0 %	Mean · Gemeinde Knonau

Indicator parameters (3)

Indicator parameters – Gemeinde Knonau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	11.5 mg/l	—	—	Mean · Gemeinde Knonau
Sodium	8.9 mg/l	200 mg/l	4 %	Mean · Gemeinde Knonau
Sulphate	10.2 mg/l	—	—	Mean · Gemeinde Knonau

Further parameters (4)

Further parameters – Gemeinde Knonau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	0 mg/l	—	—	Mean · Gemeinde Knonau
Magnesium	13.2 mg/l	—	—	Mean · Gemeinde Knonau
Potassium	1.1 mg/l	—	—	Mean · Gemeinde Knonau
Total hardness	32.5 °fH	—	—	Mean · Gemeinde Knonau

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/843/knonau/3350/gemeinde-knonau · 2026 · 2026 · retrieved on 07/08/2026

Postcodes in this zone: 8934

Frequently asked questions about drinking water in Weyer, Altenmarkt bei Sankt Gallen, Sankt Gallen

How hard is the water in Weyer, Altenmarkt bei Sankt Gallen, Sankt Gallen?: Knonau publishes a total hardness of 32.5 °fH for the supply zone Gemeinde Knonau — that corresponds to 18.2 °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 Weyer, Altenmarkt bei Sankt Gallen, Sankt Gallen?: Knonau publishes a nitrate value of 17.7 mg/l for the supply zone Gemeinde Knonau. The statutory parametric value is 40 mg/l; the measured value represents 44 % of the parametric value. Basis: 2026, retrieved on 07/08/2026.
Who supplies the drinking water in Weyer, Altenmarkt bei Sankt Gallen, Sankt Gallen?: Knonau. The values shown here come from the supply zone Gemeinde Knonau 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.