How hard is the water in Lachen SZ?

EW Lachen AG publishes a total hardness of 15 °fH for the supply zone Lachen SZ — that corresponds to 8.4 °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 Lachen SZ?

EW Lachen AG publishes a nitrate value of 3.3 mg/l for the supply zone Lachen SZ. The statutory parametric value is 40 mg/l; the measured value represents 8 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Lachen SZ?

EW Lachen AG. The values shown here come from the supply zone Lachen SZ 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 Lachen SZ

One supply zone, water supplier: EW Lachen AG.

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.

Lachen SZ

EW Lachen AG

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

Water hardness

8.4 °dH

Hardness range medium

Key values Lachen SZ
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	3.3 mg/l	40 mg/l	8 %	Mean · Lachen SZ
Escherichia coli (E. coli)	nn not detectable Unit not stated in the document	0/100 ml	—	Maximum · Median nn · Lachen SZ
Sulphate	7.8 mg/l	—	—	Mean · Lachen SZ

Show all recorded parameters (16 — most recent value per parameter)

Microbiology (3)

Microbiology – Lachen SZ
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	13 KBE/ml	300 1/ml	—	Mean · Lachen SZ
Escherichia coli (E. coli)	nn not detectable Unit not stated in the document	0/100 ml	—	Maximum · Median nn · Lachen SZ
Intestinal enterococci	nn not detectable Unit not stated in the document	0/100 ml	—	Maximum · Median nn · Lachen SZ

Chemical parameters (1)

Chemical parameters – Lachen SZ
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	3.3 mg/l	40 mg/l	8 %	Mean · Lachen SZ

PFAS (3)

PFAS – Lachen SZ
Parameter	Parametric value	Reference
Perfluorohexane sulfonic acid (PFHxS)	0.3 µg/l	Mean · Lachen SZ
Perfluorooctanesulfonic acid (PFOS)	0.3 µg/l	Mean · Lachen SZ
Perfluorooctanoic acid (PFOA)	0.5 µg/l	Mean · Lachen SZ

Indicator parameters (6)

Indicator parameters – Lachen SZ
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	4.3 mg/l	—	—	Mean · Lachen SZ
Conductivity (25 °C)	305 µS/cm	—	—	Mean · Lachen SZ
pH	7.75	—	—	Mean · Lachen SZ
Sulphate	7.8 mg/l	—	—	Mean · Lachen SZ
Temperature	10.2 °C	—	—	Mean · Lachen SZ
Turbidity	0.04 TE/F	—	—	Mean · Lachen SZ

Further parameters (3)

Further parameters – Lachen SZ
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	81 mg/l	—	—	Mean · Lachen SZ
Magnesium	8.2 mg/l	—	—	Mean · Lachen SZ
Total hardness	15 °fH	—	—	Mean · Lachen SZ

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/1139/ew-lachen-ag/3383/lachen-sz · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 8853

Frequently asked questions about drinking water in Lachen SZ

How hard is the water in Lachen SZ?: EW Lachen AG publishes a total hardness of 15 °fH for the supply zone Lachen SZ — that corresponds to 8.4 °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 Lachen SZ?: EW Lachen AG publishes a nitrate value of 3.3 mg/l for the supply zone Lachen SZ. The statutory parametric value is 40 mg/l; the measured value represents 8 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Lachen SZ?: EW Lachen AG. The values shown here come from the supply zone Lachen SZ 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.