How hard is the water in Bonstetten?

Wasserversorgung Bonstetten publishes a total hardness of 24.3 °fH for the supply zone 8906 Bonstetten, obere Druckzone — that corresponds to 13.6 °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 Bonstetten?

Wasserversorgung Bonstetten publishes a nitrate value of 8.5 mg/l for the supply zone 8906 Bonstetten, obere Druckzone. 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 Bonstetten?

Wasserversorgung Bonstetten. The values shown here come from the supply zone 8906 Bonstetten, obere Druckzone 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 Bonstetten

There are 2 places with this name — listed below by area. 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.

Bonstetten (8906)

8906 Bonstetten, obere Druckzone

Wasserversorgung Bonstetten

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

Water hardness

13.6 °dH

Hardness range medium

Key values 8906 Bonstetten, obere Druckzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	8.5 mg/l	40 mg/l	21 %	Mean · 8906 Bonstetten, obere Druckzone
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · 8906 Bonstetten, obere Druckzone

Show all recorded parameters (8 — most recent value per parameter)

Microbiology (3)

Microbiology – 8906 Bonstetten, obere Druckzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	73.2 KBE/ml	300 1/ml	—	Mean · 8906 Bonstetten, obere Druckzone
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · 8906 Bonstetten, obere Druckzone
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · 8906 Bonstetten, obere Druckzone

Chemical parameters (1)

Chemical parameters – 8906 Bonstetten, obere Druckzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	8.5 mg/l	40 mg/l	21 %	Mean · 8906 Bonstetten, obere Druckzone

Indicator parameters (1)

Indicator parameters – 8906 Bonstetten, obere Druckzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7.8	—	—	Mean · 8906 Bonstetten, obere Druckzone

Further parameters (3)

Further parameters – 8906 Bonstetten, obere Druckzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	76.1 mg/l	—	—	Mean · 8906 Bonstetten, obere Druckzone
Magnesium	13 mg/l	—	—	Mean · 8906 Bonstetten, obere Druckzone
Total hardness	24.3 °fH	—	—	Mean · 8906 Bonstetten, obere Druckzone

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/758/wasserversorgung-bonstetten/3737/8906-bonstetten-obere-druckzone · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8906

Show 1 more supply zone

8906 Bonstetten, untere Druckzone

Wasserversorgung Bonstetten

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

Water hardness

11.7 °dH

Hardness range medium

Key values 8906 Bonstetten, untere Druckzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	5.5 mg/l	40 mg/l	14 %	Mean · 8906 Bonstetten, untere Druckzone
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · 8906 Bonstetten, untere Druckzone

Show all recorded parameters (8 — most recent value per parameter)

Microbiology (3)

Microbiology – 8906 Bonstetten, untere Druckzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	25.9 KBE/ml	300 1/ml	—	Mean · 8906 Bonstetten, untere Druckzone
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · 8906 Bonstetten, untere Druckzone
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · 8906 Bonstetten, untere Druckzone

Chemical parameters (1)

Chemical parameters – 8906 Bonstetten, untere Druckzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	5.5 mg/l	40 mg/l	14 %	Mean · 8906 Bonstetten, untere Druckzone

Indicator parameters (1)

Indicator parameters – 8906 Bonstetten, untere Druckzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7.7	—	—	Mean · 8906 Bonstetten, untere Druckzone

Further parameters (3)

Further parameters – 8906 Bonstetten, untere Druckzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	66.4 mg/l	—	—	Mean · 8906 Bonstetten, untere Druckzone
Magnesium	10.7 mg/l	—	—	Mean · 8906 Bonstetten, untere Druckzone
Total hardness	20.9 °fH	—	—	Mean · 8906 Bonstetten, untere Druckzone

Source: https://trinkwasser.ch/de/versorger/758/wasserversorgung-bonstetten/3736/8906-bonstetten-untere-druckzone · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8906

Frequently asked questions about drinking water in Bonstetten

How hard is the water in Bonstetten?: Wasserversorgung Bonstetten publishes a total hardness of 24.3 °fH for the supply zone 8906 Bonstetten, obere Druckzone — that corresponds to 13.6 °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 Bonstetten?: Wasserversorgung Bonstetten publishes a nitrate value of 8.5 mg/l for the supply zone 8906 Bonstetten, obere Druckzone. 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 Bonstetten?: Wasserversorgung Bonstetten. The values shown here come from the supply zone 8906 Bonstetten, obere Druckzone 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.

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