How hard is the water in Terfens?

Brunnengenossenschaft Geiss publishes a total hardness of 39 °fH for the supply zone Dorf 6123 Geiss und Weiler Soppensee — that corresponds to 21.8 °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 Terfens?

Brunnengenossenschaft Geiss publishes a nitrate value of 27.4 mg/l for the supply zone Dorf 6123 Geiss und Weiler Soppensee. The statutory parametric value is 40 mg/l; the measured value represents 69 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Terfens?

Brunnengenossenschaft Geiss. The values shown here come from the supply zone Dorf 6123 Geiss und Weiler Soppensee 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 Terfens

One supply zone, water supplier: Brunnengenossenschaft Geiss.

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.

Dorf 6123 Geiss und Weiler Soppensee

Brunnengenossenschaft Geiss

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

Water hardness

21.8 °dH

Hardness range hard

Key values Dorf 6123 Geiss und Weiler Soppensee
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	27.4 mg/l	40 mg/l	69 %	Mean · Dorf 6123 Geiss und Weiler Soppensee
Sulphate	17.5 mg/l	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
Sodium	4.8 mg/l	200 mg/l	2 %	Mean · Dorf 6123 Geiss und Weiler Soppensee

Show all recorded parameters (20 — most recent value per parameter)

Microbiology (1)

Microbiology – Dorf 6123 Geiss und Weiler Soppensee
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	5 KBE/ml	300 1/ml	—	Mean · Dorf 6123 Geiss und Weiler Soppensee

Chemical parameters (1)

Chemical parameters – Dorf 6123 Geiss und Weiler Soppensee
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	27.4 mg/l	40 mg/l	69 %	Mean · Dorf 6123 Geiss und Weiler Soppensee

PFAS (3)

PFAS – Dorf 6123 Geiss und Weiler Soppensee
Parameter	Value	Parametric value	Share of the parametric value	Reference
Perfluorohexane sulfonic acid (PFHxS)	0.001 µg/l	0.3 µg/l	0.3 %	Mean · Dorf 6123 Geiss und Weiler Soppensee
Perfluorooctanesulfonic acid (PFOS)	0.001 µg/l	0.3 µg/l	0.3 %	Mean · Dorf 6123 Geiss und Weiler Soppensee
Perfluorooctanoic acid (PFOA)	0.001 µg/l	0.5 µg/l	0.2 %	Mean · Dorf 6123 Geiss und Weiler Soppensee

Metabolites (2)

Metabolites – Dorf 6123 Geiss und Weiler Soppensee
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	0.04 µg/l	0.1 µg/l	40 %	Mean · Dorf 6123 Geiss und Weiler Soppensee
Chlorothalonil metabolite R471811	0.51 µg/l	0.1 µg/l	510 % Mean above the parametric value	Mean · Dorf 6123 Geiss und Weiler Soppensee

Annual means and medians are not individual measured values, but the parametric values apply per sample. If a mean lies above it, at least one individual sample was above it — the mean does not say how many, or by how much. That is why this is not reported here as an exceedance of the parametric value. What counts remains the water supplier's publication, which each row links to.

Indicator parameters (8)

Indicator parameters – Dorf 6123 Geiss und Weiler Soppensee
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	8.7 mg/l	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
Conductivity (25 °C)	707 µS/cm	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
Oxidisability	0.8 mg KMnO4/l	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
pH	7.38	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
Sodium	4.8 mg/l	200 mg/l	2 %	Mean · Dorf 6123 Geiss und Weiler Soppensee
Sulphate	17.5 mg/l	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
Temperature	10 °C	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
Turbidity	0.1 TE/F	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee

Further parameters (5)

Further parameters – Dorf 6123 Geiss und Weiler Soppensee
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	121.5 mg/l	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
Hydrogen carbonate	410 mg/l	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
Magnesium	21.6 mg/l	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
Potassium	1 mg/l	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee
Total hardness	39 °fH	—	—	Mean · Dorf 6123 Geiss und Weiler Soppensee

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/1016/brunnengenossenschaft-geiss/3042/dorf-6123-geiss-und-weiler-soppensee · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 6123

Frequently asked questions about drinking water in Terfens

How hard is the water in Terfens?: Brunnengenossenschaft Geiss publishes a total hardness of 39 °fH for the supply zone Dorf 6123 Geiss und Weiler Soppensee — that corresponds to 21.8 °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 Terfens?: Brunnengenossenschaft Geiss publishes a nitrate value of 27.4 mg/l for the supply zone Dorf 6123 Geiss und Weiler Soppensee. The statutory parametric value is 40 mg/l; the measured value represents 69 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Terfens?: Brunnengenossenschaft Geiss. The values shown here come from the supply zone Dorf 6123 Geiss und Weiler Soppensee 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.