How hard is the water in Eglisau?

Wasserversorgung Eglisau publishes a total hardness of 28.4 °fH for the supply zone Eglisau ohne Wiler u. Tössriederen — that corresponds to 15.9 °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 Eglisau?

Wasserversorgung Eglisau publishes a nitrate value of 15.6 mg/l for the supply zone Eglisau ohne Wiler u. Tössriederen. The statutory parametric value is 40 mg/l; the measured value represents 39 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Eglisau?

Wasserversorgung Eglisau. The values shown here come from the supply zone Eglisau ohne Wiler u. Tössriederen 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 Eglisau

3 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.

Eglisau ohne Wiler u. Tössriederen

Wasserversorgung Eglisau

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

Water hardness

15.9 °dH

Hardness range hard

Key values Eglisau ohne Wiler u. Tössriederen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	15.6 mg/l	40 mg/l	39 %	Mean · Eglisau ohne Wiler u. Tössriederen
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Eglisau ohne Wiler u. Tössriederen

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

Microbiology (3)

Microbiology – Eglisau ohne Wiler u. Tössriederen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	28 KBE/ml	300 1/ml	—	Mean · Eglisau ohne Wiler u. Tössriederen
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Eglisau ohne Wiler u. Tössriederen
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Eglisau ohne Wiler u. Tössriederen

Chemical parameters (1)

Chemical parameters – Eglisau ohne Wiler u. Tössriederen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	15.6 mg/l	40 mg/l	39 %	Mean · Eglisau ohne Wiler u. Tössriederen

Metabolites (2)

Metabolites – Eglisau ohne Wiler u. Tössriederen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	0.216 µg/l	0.1 µg/l	216 % Mean above the parametric value	Mean · Eglisau ohne Wiler u. Tössriederen
Chlorothalonil metabolite R471811	0.081 µg/l	0.1 µg/l	81 %	Mean · Eglisau ohne Wiler u. Tössriederen

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 – Eglisau ohne Wiler u. Tössriederen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	80.6 mg/l	—	—	Mean · Eglisau ohne Wiler u. Tössriederen
Magnesium	20.3 mg/l	—	—	Mean · Eglisau ohne Wiler u. Tössriederen
Total hardness	28.4 °fH	—	—	Mean · Eglisau ohne Wiler u. Tössriederen

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/879/wasserversorgung-eglisau/3674/eglisau-ohne-wiler-u-tossriederen · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8193

Show 2 more supply zones

Tössriederen

Wasserversorgung Eglisau

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

Water hardness

18 °dH

Hardness range hard

Key values Tössriederen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	13 mg/l	40 mg/l	33 %	Mean · Tössriederen
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Tössriederen

Show all recorded parameters (7 — most recent value per parameter)

Microbiology (3)

Microbiology – Tössriederen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	53.5 KBE/ml	300 1/ml	—	Mean · Tössriederen
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Tössriederen
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Tössriederen

Chemical parameters (1)

Chemical parameters – Tössriederen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	13 mg/l	40 mg/l	33 %	Mean · Tössriederen

Further parameters (3)

Further parameters – Tössriederen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	90.6 mg/l	—	—	Mean · Tössriederen
Magnesium	23 mg/l	—	—	Mean · Tössriederen
Total hardness	32.1 °fH	—	—	Mean · Tössriederen

Source: https://trinkwasser.ch/de/versorger/879/wasserversorgung-eglisau/3676/tossriederen · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8193

Wiler

Wasserversorgung Eglisau

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 Wiler
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	18 mg/l	40 mg/l	45 %	Mean · Wiler
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Wiler

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

Microbiology (3)

Microbiology – Wiler
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	48.5 KBE/ml	300 1/ml	—	Mean · Wiler
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Wiler
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Wiler

Chemical parameters (1)

Chemical parameters – Wiler
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	18 mg/l	40 mg/l	45 %	Mean · Wiler

Metabolites (2)

Metabolites – Wiler
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	0.229 µg/l	0.1 µg/l	229 % Mean above the parametric value	Mean · Wiler
Chlorothalonil metabolite R471811	0.062 µg/l	0.1 µg/l	62 %	Mean · Wiler

Further parameters (3)

Further parameters – Wiler
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	84.8 mg/l	—	—	Mean · Wiler
Magnesium	20.8 mg/l	—	—	Mean · Wiler
Total hardness	29.7 °fH	—	—	Mean · Wiler

Source: https://trinkwasser.ch/de/versorger/879/wasserversorgung-eglisau/3675/wiler · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8193

Frequently asked questions about drinking water in Eglisau

How hard is the water in Eglisau?: Wasserversorgung Eglisau publishes a total hardness of 28.4 °fH for the supply zone Eglisau ohne Wiler u. Tössriederen — that corresponds to 15.9 °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 Eglisau?: Wasserversorgung Eglisau publishes a nitrate value of 15.6 mg/l for the supply zone Eglisau ohne Wiler u. Tössriederen. The statutory parametric value is 40 mg/l; the measured value represents 39 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Eglisau?: Wasserversorgung Eglisau. The values shown here come from the supply zone Eglisau ohne Wiler u. Tössriederen 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.