How hard is the water in Mettmenstetten?

Wasserversorgungs-Genossenschaft Rossau publishes a total hardness of 34.4 °fH for the supply zone Weiler Rossau; Untere Zone — that corresponds to 19.3 °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: 2023, retrieved on 07/08/2026.

How much nitrate is in the drinking water in Mettmenstetten?

Wasserversorgungs-Genossenschaft Rossau publishes a nitrate value of 29.2 mg/l for the supply zone Weiler Rossau; Untere Zone. The statutory parametric value is 40 mg/l; the measured value represents 73 % of the parametric value. Basis: 2023, retrieved on 07/08/2026.

Who supplies the drinking water in Mettmenstetten?

Wasserversorgungs-Genossenschaft Rossau. The values shown here come from the supply zone Weiler Rossau; Untere Zone 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 Mettmenstetten

One supply zone, water supplier: Wasserversorgungs-Genossenschaft Rossau.

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.

Weiler Rossau; Untere Zone

Wasserversorgungs-Genossenschaft Rossau

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

These values are more than a year old. The most recent analysis the water supplier has published for this zone dates from 31/12/2023. We have no newer values — which is why we show the latest available ones rather than none at all. They say nothing about how the water has changed since then.

Water hardness

19.3 °dH

Hardness range hard

Key values Weiler Rossau; Untere Zone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	29.2 mg/l	40 mg/l	73 %	Mean · Weiler Rossau; Untere Zone
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Weiler Rossau; Untere Zone

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

Microbiology (3)

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

Chemical parameters (1)

Chemical parameters – Weiler Rossau; Untere Zone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	29.2 mg/l	40 mg/l	73 %	Mean · Weiler Rossau; Untere Zone

Indicator parameters (1)

Indicator parameters – Weiler Rossau; Untere Zone
Parameter	Value	Parametric value	Share of the parametric value	Reference
pH	7.2	—	—	Mean · Weiler Rossau; Untere Zone

Further parameters (3)

Further parameters – Weiler Rossau; Untere Zone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	127.8 mg/l	—	—	Mean · Weiler Rossau; Untere Zone
Magnesium	6.2 mg/l	—	—	Mean · Weiler Rossau; Untere Zone
Total hardness	34.4 °fH	—	—	Mean · Weiler Rossau; Untere Zone

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/1419/wasserversorgungs-genossenschaft-rossau/1333/weiler-rossau-untere-zone · 2023 · 2023 · retrieved on 07/08/2026

Postcodes in this zone: 8932

Frequently asked questions about drinking water in Mettmenstetten

How hard is the water in Mettmenstetten?: Wasserversorgungs-Genossenschaft Rossau publishes a total hardness of 34.4 °fH for the supply zone Weiler Rossau; Untere Zone — that corresponds to 19.3 °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: 2023, retrieved on 07/08/2026.
How much nitrate is in the drinking water in Mettmenstetten?: Wasserversorgungs-Genossenschaft Rossau publishes a nitrate value of 29.2 mg/l for the supply zone Weiler Rossau; Untere Zone. The statutory parametric value is 40 mg/l; the measured value represents 73 % of the parametric value. Basis: 2023, retrieved on 07/08/2026.
Who supplies the drinking water in Mettmenstetten?: Wasserversorgungs-Genossenschaft Rossau. The values shown here come from the supply zone Weiler Rossau; Untere Zone 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.