How hard is the water in Frauenfeld, Gerlikon?

Thurplus publishes a total hardness of 29.7 °fH for the supply zone Frauenfeld — that corresponds to 16.6 °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 Frauenfeld, Gerlikon?

Thurplus publishes a nitrate value of 8.5 mg/l for the supply zone Frauenfeld. The statutory parametric value is 40 mg/l; the measured value represents 21 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Frauenfeld, Gerlikon?

Thurplus. The values shown here come from the supply zone Frauenfeld 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 Frauenfeld, Gerlikon

One supply zone, water supplier: Thurplus.

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.

Frauenfeld

Thurplus

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

Water hardness

16.6 °dH

Hardness range hard

Key values Frauenfeld
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	8.5 mg/l	40 mg/l	21 %	Mean · Frauenfeld
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Frauenfeld
Sulphate	16.63 mg/l	—	—	Mean · Frauenfeld
Sodium	14.6 mg/l	200 mg/l	7 %	Mean · Frauenfeld

Show all recorded parameters (13 — most recent value per parameter)

Microbiology (3)

Microbiology – Frauenfeld
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	77.75 KBE/ml	300 1/ml	—	Mean · Frauenfeld
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Frauenfeld
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Frauenfeld

Chemical parameters (1)

Chemical parameters – Frauenfeld
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	8.5 mg/l	40 mg/l	21 %	Mean · Frauenfeld

Indicator parameters (5)

Indicator parameters – Frauenfeld
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	18.5 mg/l	—	—	Mean · Frauenfeld
pH	5.64	—	—	Mean · Frauenfeld
Sodium	14.6 mg/l	200 mg/l	7 %	Mean · Frauenfeld
Sulphate	16.63 mg/l	—	—	Mean · Frauenfeld
Temperature	13.9 °C	—	—	Mean · Frauenfeld

Further parameters (4)

Further parameters – Frauenfeld
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	82.4 mg/l	—	—	Mean · Frauenfeld
Magnesium	22.34 mg/l	—	—	Mean · Frauenfeld
Potassium	2.63 mg/l	—	—	Mean · Frauenfeld
Total hardness	29.7 °fH	—	—	Mean · Frauenfeld

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/1460/thurplus/3203/frauenfeld · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8500

Frequently asked questions about drinking water in Frauenfeld, Gerlikon

How hard is the water in Frauenfeld, Gerlikon?: Thurplus publishes a total hardness of 29.7 °fH for the supply zone Frauenfeld — that corresponds to 16.6 °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 Frauenfeld, Gerlikon?: Thurplus publishes a nitrate value of 8.5 mg/l for the supply zone Frauenfeld. The statutory parametric value is 40 mg/l; the measured value represents 21 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Frauenfeld, Gerlikon?: Thurplus. The values shown here come from the supply zone Frauenfeld 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.