How hard is the water in Berndorf?

Energie Service Biel (ESB) publishes a total hardness of 11.7 °fH for the supply zone Biel — that corresponds to 6.6 °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 Berndorf?

Energie Service Biel (ESB) publishes a nitrate value of 4.5 mg/l for the supply zone Biel. The statutory parametric value is 40 mg/l; the measured value represents 11 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Berndorf?

Energie Service Biel (ESB). The values shown here come from the supply zone Biel 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 Berndorf

2 supply zones — values can differ depending on the district. Below is the zone with the most documented parameters, the others collapsed underneath. To determine the exact match, look up the postcode.

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.

Biel

Energie Service Biel (ESB)

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

Water hardness

6.6 °dH

Hardness range soft

Key values Biel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	4.5 mg/l	40 mg/l	11 %	Mean · Biel
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Biel
Sulphate	17.4 mg/l	—	—	Mean · Biel
Sodium	5.33 mg/l	200 mg/l	3 %	Mean · Biel

Show all recorded parameters (22 — most recent value per parameter)

Microbiology (3)

Microbiology – Biel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	4 KBE/ml	300 1/ml	—	Mean · Biel
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Biel
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Biel

Chemical parameters (1)

Chemical parameters – Biel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	4.5 mg/l	40 mg/l	11 %	Mean · Biel

PFAS (3)

PFAS – Biel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Perfluorohexane sulfonic acid (PFHxS)	< 0.001 µg/l below limit of quantification	0.3 µg/l	< 0.3 % *	Mean · Biel
Perfluorooctanesulfonic acid (PFOS)	< 0.001 µg/l below limit of quantification	0.3 µg/l	< 0.3 % *	Mean · Biel
Perfluorooctanoic acid (PFOA)	< 0.001 µg/l below limit of quantification	0.5 µg/l	< 0.2 % *	Mean · Biel

* 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 (2)

Metabolites – Biel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	< 0.01 µg/l below limit of quantification	0.1 µg/l	< 10 % *	Mean · Biel
Chlorothalonil metabolite R471811	< 0.03 µg/l below limit of quantification	0.1 µg/l	< 30 % *	Mean · Biel

Indicator parameters (9)

Indicator parameters – Biel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	6.4 mg/l	—	—	Mean · Biel
Conductivity (25 °C)	264 µS/cm	—	—	Mean · Biel
Iron	0.03 mg/l	0.2 mg/l	15 %	Mean · Biel
pH	7.65	—	—	Mean · Biel
Sodium	5.33 mg/l	200 mg/l	3 %	Mean · Biel
Sulphate	17.4 mg/l	—	—	Mean · Biel
Temperature	10.2 °C	—	—	Mean · Biel
Total organic carbon (TOC)	0.72 mg/l	—	—	Mean · Biel
Turbidity	0.2 TE/F	—	—	Mean · Biel

Further parameters (4)

Further parameters – Biel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	40.7 mg/l	—	—	Mean · Biel
Magnesium	4.51 mg/l	—	—	Mean · Biel
Potassium	1.18 mg/l	—	—	Mean · Biel
Total hardness	11.7 °fH	—	—	Mean · Biel

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/735/energie-service-biel-esb/3240/biel · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 2560

Show 1 more supply zone

Nidau

Energie Service Biel (ESB)

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

Water hardness

6.5 °dH

Hardness range soft

Key values Nidau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	4.2 mg/l	40 mg/l	11 %	Mean · Nidau
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Nidau
Sulphate	16 mg/l	—	—	Mean · Nidau
Sodium	4.9 mg/l	200 mg/l	2 %	Mean · Nidau

Show all recorded parameters (21 — most recent value per parameter)

Microbiology (3)

Microbiology – Nidau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	8 KBE/ml	300 1/ml	—	Mean · Nidau
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Nidau
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Nidau

Chemical parameters (1)

Chemical parameters – Nidau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	4.2 mg/l	40 mg/l	11 %	Mean · Nidau

PFAS (3)

PFAS – Nidau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Perfluorohexane sulfonic acid (PFHxS)	< 0.001 µg/l below limit of quantification	0.3 µg/l	< 0.3 % *	Mean · Nidau
Perfluorooctanesulfonic acid (PFOS)	< 0.001 µg/l below limit of quantification	0.3 µg/l	< 0.3 % *	Mean · Nidau
Perfluorooctanoic acid (PFOA)	< 0.001 µg/l below limit of quantification	0.5 µg/l	< 0.2 % *	Mean · Nidau

Metabolites (2)

Metabolites – Nidau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	< 0.01 µg/l below limit of quantification	0.1 µg/l	< 10 % *	Mean · Nidau
Chlorothalonil metabolite R471811	< 0.03 µg/l below limit of quantification	0.1 µg/l	< 30 % *	Mean · Nidau

Indicator parameters (8)

Indicator parameters – Nidau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	6.9 mg/l	—	—	Mean · Nidau
Conductivity (25 °C)	247.3 µS/cm	—	—	Mean · Nidau
Iron	0.049 mg/l	0.2 mg/l	25 %	Mean · Nidau
pH	7.6	—	—	Mean · Nidau
Sodium	4.9 mg/l	200 mg/l	2 %	Mean · Nidau
Sulphate	16 mg/l	—	—	Mean · Nidau
Temperature	10.9 °C	—	—	Mean · Nidau
Turbidity	0.4 TE/F	—	—	Mean · Nidau

Further parameters (4)

Further parameters – Nidau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	37.6 mg/l	—	—	Mean · Nidau
Magnesium	4.2 mg/l	—	—	Mean · Nidau
Potassium	1.2 mg/l	—	—	Mean · Nidau
Total hardness	11.6 °fH	—	—	Mean · Nidau

Source: https://trinkwasser.ch/de/versorger/735/energie-service-biel-esb/3252/nidau · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 2560

Frequently asked questions about drinking water in Berndorf

How hard is the water in Berndorf?: Energie Service Biel (ESB) publishes a total hardness of 11.7 °fH for the supply zone Biel — that corresponds to 6.6 °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 Berndorf?: Energie Service Biel (ESB) publishes a nitrate value of 4.5 mg/l for the supply zone Biel. The statutory parametric value is 40 mg/l; the measured value represents 11 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Berndorf?: Energie Service Biel (ESB). The values shown here come from the supply zone Biel 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.