How hard is the water in Kilchberg ZH?

Wasserversorgung Kilchberg publishes a total hardness of 28.2 °fH for the supply zone Obere Zone — that corresponds to 15.8 °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 Kilchberg ZH?

Wasserversorgung Kilchberg publishes a nitrate value of 5.47 mg/l for the supply zone Obere Zone. The statutory parametric value is 40 mg/l; the measured value represents 14 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Kilchberg ZH?

Wasserversorgung Kilchberg. The values shown here come from the supply zone Obere Zone 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 Kilchberg ZH

2 supply zones — values can differ depending on the district. Below is the zone with the most documented parameters, the others collapsed underneath. To determine the exact match, look up the postcode.

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.

Obere Zone

Wasserversorgung Kilchberg

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

Water hardness

15.8 °dH

Hardness range hard

Key values Obere Zone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	5.47 mg/l	40 mg/l	14 %	Mean · Obere Zone
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Obere Zone
Sulphate	6.16 mg/l	—	—	Mean · Obere Zone
Sodium	8.71 mg/l	200 mg/l	4 %	Mean · Obere Zone

Show all recorded parameters (21 — most recent value per parameter)

Microbiology (3)

Microbiology – Obere Zone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	8.58 KBE/ml	300 1/ml	—	Mean · Obere Zone
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Obere Zone
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Obere Zone

Chemical parameters (2)

Chemical parameters – Obere Zone
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 · Obere Zone
Nitrate	5.47 mg/l	40 mg/l	14 %	Mean · Obere Zone

* 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.

PFAS (3)

PFAS – Obere Zone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Perfluorohexane sulfonic acid (PFHxS)	< 0.001 µg/l below limit of quantification	0.3 µg/l	< 0.3 % *	Mean · Obere Zone
Perfluorooctanesulfonic acid (PFOS)	< 0.001 µg/l below limit of quantification	0.3 µg/l	< 0.3 % *	Mean · Obere Zone
Perfluorooctanoic acid (PFOA)	< 0.001 µg/l below limit of quantification	0.5 µg/l	< 0.2 % *	Mean · Obere Zone

Metabolites (2)

Metabolites – Obere Zone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	< 0.1 µg/l below limit of quantification	0.1 µg/l	cannot be assessed — the limit of quantification of the measurement is above the parametric value	Mean · Obere Zone
Chlorothalonil metabolite R471811	< 0.1 µg/l below limit of quantification	0.1 µg/l	cannot be assessed — the limit of quantification of the measurement is above the parametric value	Mean · Obere Zone

Indicator parameters (6)

Indicator parameters – Obere Zone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	12.19 mg/l	—	—	Mean · Obere Zone
Conductivity (25 °C)	498.42 µS/cm	—	—	Mean · Obere Zone
pH	7.35	—	—	Mean · Obere Zone
Sodium	8.71 mg/l	200 mg/l	4 %	Mean · Obere Zone
Sulphate	6.16 mg/l	—	—	Mean · Obere Zone
Temperature	12.88 °C	—	—	Mean · Obere Zone

Further parameters (5)

Further parameters – Obere Zone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	98.77 mg/l	—	—	Mean · Obere Zone
Hydrogen carbonate	27.46 mg/l	—	—	Mean · Obere Zone
Magnesium	8.64 mg/l	—	—	Mean · Obere Zone
Potassium	1.79 mg/l	—	—	Mean · Obere Zone
Total hardness	28.2 °fH	—	—	Mean · Obere Zone

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/1284/wasserversorgung-kilchberg/3170/obere-zone · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8802

Show 1 more supply zone

Untere Zone