How hard is the water in Schlieren?

Stadt Schlieren publishes a total hardness of 26.6 °fH for the supply zone Wasserversorgung Schlieren — that corresponds to 14.9 °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 Schlieren?

Stadt Schlieren publishes a nitrate value of 8.5 mg/l for the supply zone Wasserversorgung Schlieren. 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 Schlieren?

Stadt Schlieren. The values shown here come from the supply zone Wasserversorgung Schlieren 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 Schlieren

One supply zone, water supplier: Stadt Schlieren.

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.

Wasserversorgung Schlieren

Stadt Schlieren

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

Water hardness

14.9 °dH

Hardness range hard

Key values Wasserversorgung Schlieren
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	8.5 mg/l	40 mg/l	21 %	Mean · Wasserversorgung Schlieren
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Wasserversorgung Schlieren
Sulphate	17.8 mg/l	—	—	Mean · Wasserversorgung Schlieren
Sodium	10.2 mg/l	200 mg/l	5 %	Mean · Wasserversorgung Schlieren

Show all recorded parameters (15 — most recent value per parameter)

Microbiology (3)

Microbiology – Wasserversorgung Schlieren
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	16 KBE/ml	300 1/ml	—	Mean · Wasserversorgung Schlieren
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Wasserversorgung Schlieren
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Wasserversorgung Schlieren

Chemical parameters (2)

Chemical parameters – Wasserversorgung Schlieren
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	< 0.1 mg/l below limit of quantification	1.5 mg/l	< 7 % *	Mean · Wasserversorgung Schlieren
Nitrate	8.5 mg/l	40 mg/l	21 %	Mean · Wasserversorgung Schlieren

* 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.

Indicator parameters (6)

Indicator parameters – Wasserversorgung Schlieren
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	14.7 mg/l	—	—	Mean · Wasserversorgung Schlieren
Conductivity (25 °C)	475.7 µS/cm	—	—	Mean · Wasserversorgung Schlieren
pH	7.4	—	—	Mean · Wasserversorgung Schlieren
Sodium	10.2 mg/l	200 mg/l	5 %	Mean · Wasserversorgung Schlieren
Sulphate	17.8 mg/l	—	—	Mean · Wasserversorgung Schlieren
Temperature	13.2 °C	—	—	Mean · Wasserversorgung Schlieren

Further parameters (4)

Further parameters – Wasserversorgung Schlieren
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	78.7 mg/l	—	—	Mean · Wasserversorgung Schlieren
Magnesium	16.9 mg/l	—	—	Mean · Wasserversorgung Schlieren
Potassium	1.6 mg/l	—	—	Mean · Wasserversorgung Schlieren
Total hardness	26.6 °fH	—	—	Mean · Wasserversorgung Schlieren

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/1510/stadt-schlieren/3393/wasserversorgung-schlieren · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8952

Frequently asked questions about drinking water in Schlieren

How hard is the water in Schlieren?: Stadt Schlieren publishes a total hardness of 26.6 °fH for the supply zone Wasserversorgung Schlieren — that corresponds to 14.9 °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 Schlieren?: Stadt Schlieren publishes a nitrate value of 8.5 mg/l for the supply zone Wasserversorgung Schlieren. 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 Schlieren?: Stadt Schlieren. The values shown here come from the supply zone Wasserversorgung Schlieren 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.