How much nitrate is in the drinking water in Willisau?

Wasserversorgungs-Genossenschaft Gettnau (WVG Gettnau) publishes a nitrate value of 9.2 mg/l for the supply zone Gettnau. The statutory parametric value is 40 mg/l; the measured value represents 23 % of the parametric value. Basis: Publication by the water supplier, retrieved on 12/08/2026.

Who supplies the drinking water in Willisau?

Wasserversorgungs-Genossenschaft Gettnau (WVG Gettnau). The values shown here come from the supply zone Gettnau 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 Willisau

One supply zone, water supplier: Wasserversorgungs-Genossenschaft Gettnau (WVG Gettnau).

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.

Gettnau

Wasserversorgungs-Genossenschaft Gettnau (WVG Gettnau)

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

Key values Gettnau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	9.2 mg/l	40 mg/l	23 %	Single value
Escherichia coli (E. coli)	nn in 100 ml not detectable	0/100 ml	—	Single value
Sulphate	9.9 mg/l	—	—	Single value

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

Microbiology (2)

Microbiology – Gettnau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	nn in 100 ml not detectable	0/100 ml	—	Single value
Intestinal enterococci	nn in 100 ml not detectable	0/100 ml	—	Single value

Chemical parameters (1)

Chemical parameters – Gettnau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	9.2 mg/l	40 mg/l	23 %	Single value

Indicator parameters (2)

Indicator parameters – Gettnau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	2.5 mg/l	—	—	Single value
Sulphate	9.9 mg/l	—	—	Single value

Further parameters (3)

Further parameters – Gettnau
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	54 mg/l	—	—	Single value
Magnesium	16 mg/l	—	—	Single value
Phosphate	0.007 µg/l	1 mg/l	< 0.1 %	Single value

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://willisau.ch/files/Files/Bilder/Inhalt/Leben_Wohnen/Wasserversorgung/Wasserversorgung_Gettnau/Info_Qualitaetsblatt.pdf · 19. März 2026 · retrieved on 12/08/2026

Postcodes in this zone: 6130

Frequently asked questions about drinking water in Willisau

How much nitrate is in the drinking water in Willisau?: Wasserversorgungs-Genossenschaft Gettnau (WVG Gettnau) publishes a nitrate value of 9.2 mg/l for the supply zone Gettnau. The statutory parametric value is 40 mg/l; the measured value represents 23 % of the parametric value. Basis: Publication by the water supplier, retrieved on 12/08/2026.
Who supplies the drinking water in Willisau?: Wasserversorgungs-Genossenschaft Gettnau (WVG Gettnau). The values shown here come from the supply zone Gettnau 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.