How hard is the water in Rodersdorf?

WHL AG publishes a total hardness of 28.9 °fH for the supply zone Solothurnisches Leimental — that corresponds to 16.2 °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 Rodersdorf?

WHL AG publishes a nitrate value of 12.4 mg/l for the supply zone Solothurnisches Leimental. The statutory parametric value is 40 mg/l; the measured value represents 31 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Rodersdorf?

WHL AG. The values shown here come from the supply zone Solothurnisches Leimental 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 Rodersdorf

One supply zone, water supplier: WHL AG.

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.

Solothurnisches Leimental

WHL AG

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

Water hardness

16.2 °dH

Hardness range hard

Key values Solothurnisches Leimental
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	12.4 mg/l	40 mg/l	31 %	Mean · Solothurnisches Leimental
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Solothurnisches Leimental

Show all recorded parameters (10 — most recent value per parameter)

Microbiology (3)

Microbiology – Solothurnisches Leimental
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	9.2 KBE/ml	300 1/ml	—	Mean · Solothurnisches Leimental
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Solothurnisches Leimental
Intestinal enterococci	1 KBE/100ml	0/100 ml	above the parametric value — this parameter must not be detectable	Maximum · Median 0 · Solothurnisches Leimental

An exceedance of a parametric value does not automatically mean a health risk; the statutory parametric values include safety margins. Assessment and any measures are the responsibility of the competent health authority of the respective country.

Chemical parameters (1)

Chemical parameters – Solothurnisches Leimental
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	12.4 mg/l	40 mg/l	31 %	Mean · Solothurnisches Leimental

Metabolites (2)

Metabolites – Solothurnisches Leimental
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	0 µg/l	0.1 µg/l	0 %	Mean · Solothurnisches Leimental
Chlorothalonil metabolite R471811	0.3 µg/l	0.1 µg/l	300 % Mean above the parametric value	Mean · Solothurnisches Leimental

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 (4)

Further parameters – Solothurnisches Leimental
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	110.9 mg/l	—	—	Mean · Solothurnisches Leimental
Magnesium	3 mg/l	—	—	Mean · Solothurnisches Leimental
Spectral absorption coefficient 254 nm (SAC 254)	4.5 1/m	—	—	Mean · Solothurnisches Leimental
Total hardness	28.9 °fH	—	—	Mean · Solothurnisches Leimental

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/1187/whl-ag/3421/solothurnisches-leimental · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 4118

Frequently asked questions about drinking water in Rodersdorf

How hard is the water in Rodersdorf?: WHL AG publishes a total hardness of 28.9 °fH for the supply zone Solothurnisches Leimental — that corresponds to 16.2 °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 Rodersdorf?: WHL AG publishes a nitrate value of 12.4 mg/l for the supply zone Solothurnisches Leimental. The statutory parametric value is 40 mg/l; the measured value represents 31 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Rodersdorf?: WHL AG. The values shown here come from the supply zone Solothurnisches Leimental 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.