How hard is the water in Oberuzwil?

Wasserkorporation Oberuzwil publishes a total hardness of 37 °fH for the supply zone Oberuzwil — that corresponds to 20.7 °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 Oberuzwil?

Wasserkorporation Oberuzwil publishes a nitrate value of 10 mg/l for the supply zone Oberuzwil. The statutory parametric value is 40 mg/l; the measured value represents 25 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Oberuzwil?

Wasserkorporation Oberuzwil. The values shown here come from the supply zone Oberuzwil 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 Oberuzwil

One supply zone, water supplier: Wasserkorporation Oberuzwil.

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.

Oberuzwil

Wasserkorporation Oberuzwil

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

Water hardness

20.7 °dH

Hardness range hard

Key values Oberuzwil
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	10 mg/l	40 mg/l	25 %	Mean · Oberuzwil
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Oberuzwil
Sulphate	10 mg/l	—	—	Mean · Oberuzwil

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

Microbiology (3)

Microbiology – Oberuzwil
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	9 KBE/ml	300 1/ml	—	Mean · Oberuzwil
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Oberuzwil
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Oberuzwil

Chemical parameters (1)

Chemical parameters – Oberuzwil
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	10 mg/l	40 mg/l	25 %	Mean · Oberuzwil

Indicator parameters (3)

Indicator parameters – Oberuzwil
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	6 mg/l	—	—	Mean · Oberuzwil
Conductivity (25 °C)	721 µS/cm	—	—	Mean · Oberuzwil
Sulphate	10 mg/l	—	—	Mean · Oberuzwil

Further parameters (4)

Further parameters – Oberuzwil
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	108 mg/l	—	—	Mean · Oberuzwil
Dissolved organic carbon (DOC)	0.99 mg/l	—	—	Mean · Oberuzwil
Magnesium	26 mg/l	—	—	Mean · Oberuzwil
Total hardness	37 °fH	—	—	Mean · Oberuzwil

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/1376/wasserkorporation-oberuzwil/3325/oberuzwil · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 9242

Frequently asked questions about drinking water in Oberuzwil

How hard is the water in Oberuzwil?: Wasserkorporation Oberuzwil publishes a total hardness of 37 °fH for the supply zone Oberuzwil — that corresponds to 20.7 °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 Oberuzwil?: Wasserkorporation Oberuzwil publishes a nitrate value of 10 mg/l for the supply zone Oberuzwil. The statutory parametric value is 40 mg/l; the measured value represents 25 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Oberuzwil?: Wasserkorporation Oberuzwil. The values shown here come from the supply zone Oberuzwil 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.