How hard is the water in Trimbach?

Städtische Betriebe Olten publishes a total hardness of 31 °fH for the supply zone Olten - Trimbach — that corresponds to 17.4 °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: 2025, retrieved on 07/08/2026.

How much nitrate is in the drinking water in Trimbach?

Städtische Betriebe Olten publishes a nitrate value of 25.2 mg/l for the supply zone Olten - Trimbach. The statutory parametric value is 40 mg/l; the measured value represents 63 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Trimbach?

Städtische Betriebe Olten. The values shown here come from the supply zone Olten - Trimbach 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 Trimbach

One supply zone, water supplier: Städtische Betriebe Olten.

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.

Olten - Trimbach

Städtische Betriebe Olten

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

Water hardness

17.4 °dH

Hardness range hard

Key values Olten - Trimbach
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	25.2 mg/l	40 mg/l	63 %	Mean · Olten - Trimbach
Escherichia coli (E. coli)	nn not detectable Unit not stated in the document	0/100 ml	—	Maximum · Median nn · Olten - Trimbach

Show all recorded parameters (9 — most recent value per parameter)

Microbiology (3)

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

Chemical parameters (1)

Chemical parameters – Olten - Trimbach
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	25.2 mg/l	40 mg/l	63 %	Mean · Olten - Trimbach

Metabolites (2)

Metabolites – Olten - Trimbach
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	0.05 µg/l	0.1 µg/l	50 %	Mean · Olten - Trimbach
Chlorothalonil metabolite R471811	0.36 µg/l	0.1 µg/l	360 % Mean above the parametric value	Mean · Olten - Trimbach

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.

Further parameters (3)

Further parameters – Olten - Trimbach
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	116 mg/l	—	—	Mean · Olten - Trimbach
Magnesium	7.01 mg/l	—	—	Mean · Olten - Trimbach
Total hardness	31 °fH	—	—	Mean · Olten - Trimbach

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/709/stadtische-betriebe-olten/3187/olten-trimbach · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 4632

Frequently asked questions about drinking water in Trimbach

How hard is the water in Trimbach?: Städtische Betriebe Olten publishes a total hardness of 31 °fH for the supply zone Olten - Trimbach — that corresponds to 17.4 °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: 2025, retrieved on 07/08/2026.
How much nitrate is in the drinking water in Trimbach?: Städtische Betriebe Olten publishes a nitrate value of 25.2 mg/l for the supply zone Olten - Trimbach. The statutory parametric value is 40 mg/l; the measured value represents 63 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Trimbach?: Städtische Betriebe Olten. The values shown here come from the supply zone Olten - Trimbach 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.