How hard is the water in Oberwil-Lieli?

Gemeinde Oberwil-Lieli publishes a total hardness of 39.2 °fH for the supply zone Oberwil-Lieli — that corresponds to 22 °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 Oberwil-Lieli?

Gemeinde Oberwil-Lieli publishes a nitrate value of 18.3 mg/l for the supply zone Oberwil-Lieli. The statutory parametric value is 40 mg/l; the measured value represents 46 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Oberwil-Lieli?

Gemeinde Oberwil-Lieli. The values shown here come from the supply zone Oberwil-Lieli 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 Oberwil-Lieli

One supply zone, water supplier: Gemeinde Oberwil-Lieli.

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.

Oberwil-Lieli

Gemeinde Oberwil-Lieli

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

Water hardness

22 °dH

Hardness range hard

Key values Oberwil-Lieli
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	18.3 mg/l	40 mg/l	46 %	Mean · Oberwil-Lieli
Sulphate	11.8 mg/l	—	—	Mean · Oberwil-Lieli
Sodium	7 mg/l	200 mg/l	3 %	Mean · Oberwil-Lieli

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

Microbiology (1)

Microbiology – Oberwil-Lieli
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	3 KBE/ml	300 1/ml	—	Mean · Oberwil-Lieli

Chemical parameters (2)

Chemical parameters – Oberwil-Lieli
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	< 0.1 mg/l below limit of quantification	1.5 mg/l	< 7 % *	Mean · Oberwil-Lieli
Nitrate	18.3 mg/l	40 mg/l	46 %	Mean · Oberwil-Lieli

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Indicator parameters (4)

Indicator parameters – Oberwil-Lieli
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	10.2 mg/l	—	—	Mean · Oberwil-Lieli
Sodium	7 mg/l	200 mg/l	3 %	Mean · Oberwil-Lieli
Sulphate	11.8 mg/l	—	—	Mean · Oberwil-Lieli
Temperature	11.6 °C	—	—	Mean · Oberwil-Lieli

Further parameters (5)

Further parameters – Oberwil-Lieli
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	122.5 mg/l	—	—	Mean · Oberwil-Lieli
Dissolved organic carbon (DOC)	0.51 mg/l	—	—	Mean · Oberwil-Lieli
Magnesium	26.3 mg/l	—	—	Mean · Oberwil-Lieli
Potassium	1.4 mg/l	—	—	Mean · Oberwil-Lieli
Total hardness	39.2 °fH	—	—	Mean · Oberwil-Lieli

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/1458/gemeinde-oberwil-lieli/3346/oberwil-lieli · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8966

Frequently asked questions about drinking water in Oberwil-Lieli

How hard is the water in Oberwil-Lieli?: Gemeinde Oberwil-Lieli publishes a total hardness of 39.2 °fH for the supply zone Oberwil-Lieli — that corresponds to 22 °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 Oberwil-Lieli?: Gemeinde Oberwil-Lieli publishes a nitrate value of 18.3 mg/l for the supply zone Oberwil-Lieli. The statutory parametric value is 40 mg/l; the measured value represents 46 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Oberwil-Lieli?: Gemeinde Oberwil-Lieli. The values shown here come from the supply zone Oberwil-Lieli 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.