How hard is the water in Tagelswangen?

Wasserversorgung Illnau-Effretikon publishes a total hardness of 33.5 °fH for the supply zone Illnau-Effretikon — that corresponds to 18.8 °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 Tagelswangen?

Wasserversorgung Illnau-Effretikon publishes a nitrate value of 22.5 mg/l for the supply zone Illnau-Effretikon. The statutory parametric value is 40 mg/l; the measured value represents 56 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Tagelswangen?

Wasserversorgung Illnau-Effretikon. The values shown here come from the supply zone Illnau-Effretikon 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 Tagelswangen

One supply zone, water supplier: Wasserversorgung Illnau-Effretikon.

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.

Illnau-Effretikon

Wasserversorgung Illnau-Effretikon

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

Water hardness

18.8 °dH

Hardness range hard

Key values Illnau-Effretikon
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	22.5 mg/l	40 mg/l	56 %	Mean · Illnau-Effretikon
Escherichia coli (E. coli)	1 KBE/100ml	0/100 ml	above the parametric value — this parameter must not be detectable	Maximum · Median 0 · Illnau-Effretikon
Sulphate	7.5 mg/l	—	—	Mean · Illnau-Effretikon
Sodium	7.1 mg/l	200 mg/l	4 %	Mean · Illnau-Effretikon

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.

Show all recorded parameters (17 — most recent value per parameter)

Microbiology (3)

Microbiology – Illnau-Effretikon
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	15 KBE/ml	300 1/ml	—	Mean · Illnau-Effretikon
Escherichia coli (E. coli)	1 KBE/100ml	0/100 ml	above the parametric value — this parameter must not be detectable	Maximum · Median 0 · Illnau-Effretikon
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Illnau-Effretikon

Chemical parameters (2)

Chemical parameters – Illnau-Effretikon
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0 mg/l	1.5 mg/l	0 %	Mean · Illnau-Effretikon
Nitrate	22.5 mg/l	40 mg/l	56 %	Mean · Illnau-Effretikon

Metabolites (2)

Metabolites – Illnau-Effretikon
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorothalonil metabolite R417888	0.035 µg/l	0.1 µg/l	35 %	Mean · Illnau-Effretikon
Chlorothalonil metabolite R471811	0.075 µg/l	0.1 µg/l	75 %	Mean · Illnau-Effretikon

Indicator parameters (6)

Indicator parameters – Illnau-Effretikon
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	10.5 mg/l	—	—	Mean · Illnau-Effretikon
Conductivity (25 °C)	555 µS/cm	—	—	Mean · Illnau-Effretikon
pH	7.5	—	—	Mean · Illnau-Effretikon
Sodium	7.1 mg/l	200 mg/l	4 %	Mean · Illnau-Effretikon
Sulphate	7.5 mg/l	—	—	Mean · Illnau-Effretikon
Temperature	12.5 °C	—	—	Mean · Illnau-Effretikon

Further parameters (4)

Further parameters – Illnau-Effretikon
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	96.5 mg/l	—	—	Mean · Illnau-Effretikon
Magnesium	24 mg/l	—	—	Mean · Illnau-Effretikon
Potassium	1.2 mg/l	—	—	Mean · Illnau-Effretikon
Total hardness	33.5 °fH	—	—	Mean · Illnau-Effretikon

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/951/wasserversorgung-illnau-effretikon/3214/illnau-effretikon · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8317

Frequently asked questions about drinking water in Tagelswangen

How hard is the water in Tagelswangen?: Wasserversorgung Illnau-Effretikon publishes a total hardness of 33.5 °fH for the supply zone Illnau-Effretikon — that corresponds to 18.8 °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 Tagelswangen?: Wasserversorgung Illnau-Effretikon publishes a nitrate value of 22.5 mg/l for the supply zone Illnau-Effretikon. The statutory parametric value is 40 mg/l; the measured value represents 56 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Tagelswangen?: Wasserversorgung Illnau-Effretikon. The values shown here come from the supply zone Illnau-Effretikon 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.