How hard is the water in Obfelden?

Gemeindewerke Obfelden publishes a total hardness of 29.2 °fH for the supply zone Obfelden — that corresponds to 16.4 °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: 2023, retrieved on 07/08/2026.

How much nitrate is in the drinking water in Obfelden?

Gemeindewerke Obfelden publishes a nitrate value of 14.4 mg/l for the supply zone Obfelden. The statutory parametric value is 40 mg/l; the measured value represents 36 % of the parametric value. Basis: 2023, retrieved on 07/08/2026.

Who supplies the drinking water in Obfelden?

Gemeindewerke Obfelden. The values shown here come from the supply zone Obfelden 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 Obfelden

One supply zone, water supplier: Gemeindewerke Obfelden.

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.

Obfelden

Gemeindewerke Obfelden

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

These values are more than a year old. The most recent analysis the water supplier has published for this zone dates from 31/12/2023. We have no newer values — which is why we show the latest available ones rather than none at all. They say nothing about how the water has changed since then.

Water hardness

16.4 °dH

Hardness range hard

Key values Obfelden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	14.4 mg/l	40 mg/l	36 %	Mean · Obfelden
Escherichia coli (E. coli)	nn not detectable Unit not stated in the document	0/100 ml	—	Maximum · Median nn · Obfelden
Sulphate	19.9 mg/l	—	—	Mean · Obfelden
Sodium	21.3 mg/l	200 mg/l	11 %	Mean · Obfelden

Show all recorded parameters (18 — most recent value per parameter)

Microbiology (3)

Microbiology – Obfelden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	14.3 KBE/ml	300 1/ml	—	Mean · Obfelden
Escherichia coli (E. coli)	nn not detectable Unit not stated in the document	0/100 ml	—	Maximum · Median nn · Obfelden
Intestinal enterococci	nn not detectable Unit not stated in the document	0/100 ml	—	Maximum · Median nn · Obfelden

Chemical parameters (2)

Chemical parameters – Obfelden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	< 1 mg/l below limit of quantification	1.5 mg/l	< 67 % *	Mean · Obfelden
Nitrate	14.4 mg/l	40 mg/l	36 %	Mean · Obfelden

* 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.

Metabolites (1)

Metabolites – Obfelden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R471811	0.083 µg/l	0.1 µg/l	83 %	Mean · Obfelden

Indicator parameters (6)

Indicator parameters – Obfelden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	31.8 mg/l	—	—	Mean · Obfelden
Conductivity (25 °C)	580 µS/cm	—	—	Mean · Obfelden
pH	7.4	—	—	Mean · Obfelden
Sodium	21.3 mg/l	200 mg/l	11 %	Mean · Obfelden
Sulphate	19.9 mg/l	—	—	Mean · Obfelden
Temperature	14.3 °C	—	—	Mean · Obfelden

Further parameters (6)

Further parameters – Obfelden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	95.7 mg/l	—	—	Mean · Obfelden
Hydrogen carbonate	25.8 mg/l	—	—	Mean · Obfelden
Magnesium	12.9 mg/l	—	—	Mean · Obfelden
Potassium	2.6 mg/l	—	—	Mean · Obfelden
Spectral absorption coefficient 254 nm (SAC 254)	1.4 1/m	—	—	Mean · Obfelden
Total hardness	29.2 °fH	—	—	Mean · Obfelden

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/803/gemeindewerke-obfelden/1788/obfelden · 2023 · 2023 · retrieved on 07/08/2026

Postcodes in this zone: 8912

Frequently asked questions about drinking water in Obfelden

How hard is the water in Obfelden?: Gemeindewerke Obfelden publishes a total hardness of 29.2 °fH for the supply zone Obfelden — that corresponds to 16.4 °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: 2023, retrieved on 07/08/2026.
How much nitrate is in the drinking water in Obfelden?: Gemeindewerke Obfelden publishes a nitrate value of 14.4 mg/l for the supply zone Obfelden. The statutory parametric value is 40 mg/l; the measured value represents 36 % of the parametric value. Basis: 2023, retrieved on 07/08/2026.
Who supplies the drinking water in Obfelden?: Gemeindewerke Obfelden. The values shown here come from the supply zone Obfelden 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.