How hard is the water in Gossau SG?

Stadtwerke Gossau publishes a total hardness of 36.2 °fH for the supply zone Stadtgebiet Gossau — that corresponds to 20.3 °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 Gossau SG?

Stadtwerke Gossau publishes a nitrate value of 15.2 mg/l for the supply zone Stadtgebiet Gossau. 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 Gossau SG?

Stadtwerke Gossau. The values shown here come from the supply zone Stadtgebiet Gossau 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 Gossau SG

One supply zone, water supplier: Stadtwerke Gossau.

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.

Stadtgebiet Gossau

Stadtwerke Gossau

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

Water hardness

20.3 °dH

Hardness range hard

Key values Stadtgebiet Gossau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	15.2 mg/l	40 mg/l	38 %	Mean · Stadtgebiet Gossau
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Stadtgebiet Gossau
Sulphate	7.6 mg/l	—	—	Mean · Stadtgebiet Gossau
Sodium	9.5 mg/l	200 mg/l	5 %	Mean · Stadtgebiet Gossau

Show all recorded parameters (17 — most recent value per parameter)

Microbiology (3)

Microbiology – Stadtgebiet Gossau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	12 KBE/ml	300 1/ml	—	Mean · Stadtgebiet Gossau
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Stadtgebiet Gossau
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Stadtgebiet Gossau

Chemical parameters (1)

Chemical parameters – Stadtgebiet Gossau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	15.2 mg/l	40 mg/l	38 %	Mean · Stadtgebiet Gossau

Metabolites (2)

Metabolites – Stadtgebiet Gossau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	0 µg/l	0.1 µg/l	0 %	Mean · Stadtgebiet Gossau
Chlorothalonil metabolite R471811	0 µg/l	0.1 µg/l	0 %	Mean · Stadtgebiet Gossau

Indicator parameters (7)

Indicator parameters – Stadtgebiet Gossau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	14.2 mg/l	—	—	Mean · Stadtgebiet Gossau
Conductivity (25 °C)	650 µS/cm	—	—	Mean · Stadtgebiet Gossau
pH	7.37	—	—	Mean · Stadtgebiet Gossau
Sodium	9.5 mg/l	200 mg/l	5 %	Mean · Stadtgebiet Gossau
Sulphate	7.6 mg/l	—	—	Mean · Stadtgebiet Gossau
Temperature	11 °C	—	—	Mean · Stadtgebiet Gossau
Turbidity	0.1 TE/F	—	—	Mean · Stadtgebiet Gossau

Further parameters (4)

Further parameters – Stadtgebiet Gossau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	117 mg/l	—	—	Mean · Stadtgebiet Gossau
Magnesium	17.4 mg/l	—	—	Mean · Stadtgebiet Gossau
Potassium	1.84 mg/l	—	—	Mean · Stadtgebiet Gossau
Total hardness	36.2 °fH	—	—	Mean · Stadtgebiet Gossau

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/1059/stadtwerke-gossau/3507/stadtgebiet-gossau · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 9200

Frequently asked questions about drinking water in Gossau SG

How hard is the water in Gossau SG?: Stadtwerke Gossau publishes a total hardness of 36.2 °fH for the supply zone Stadtgebiet Gossau — that corresponds to 20.3 °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 Gossau SG?: Stadtwerke Gossau publishes a nitrate value of 15.2 mg/l for the supply zone Stadtgebiet Gossau. 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 Gossau SG?: Stadtwerke Gossau. The values shown here come from the supply zone Stadtgebiet Gossau 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.