How hard is the water in Lyss?

Evolon AG publishes a total hardness of 22.5 °fH for the supply zone Lyss — that corresponds to 12.6 °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 Lyss?

Evolon AG publishes a nitrate value of 10.55 mg/l for the supply zone Lyss. The statutory parametric value is 40 mg/l; the measured value represents 26 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Lyss?

Evolon AG. The values shown here come from the supply zone Lyss 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 Lyss

2 supply zones — values can differ depending on the district. Below is the zone with the most documented parameters, the others collapsed underneath. To determine the exact match, look up the postcode.

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.

Lyss

Evolon AG

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

Water hardness

12.6 °dH

Hardness range medium

Key values Lyss
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	10.55 mg/l	40 mg/l	26 %	Mean · Lyss
Escherichia coli (E. coli)	nn not detectable Unit not stated in the document	0/100 ml	—	Maximum · Median nn · Lyss

Show all recorded parameters (7 — most recent value per parameter)

Microbiology (3)

Microbiology – Lyss
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	1.5 KBE/ml	300 1/ml	—	Mean · Lyss
Escherichia coli (E. coli)	nn not detectable Unit not stated in the document	0/100 ml	—	Maximum · Median nn · Lyss
Intestinal enterococci	nn not detectable Unit not stated in the document	0/100 ml	—	Maximum · Median nn · Lyss

Chemical parameters (1)

Chemical parameters – Lyss
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	10.55 mg/l	40 mg/l	26 %	Mean · Lyss

Further parameters (3)

Further parameters – Lyss
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	80 mg/l	—	—	Mean · Lyss
Magnesium	6.1 mg/l	—	—	Mean · Lyss
Total hardness	22.5 °fH	—	—	Mean · Lyss

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/706/evolon-ag/2381/lyss · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 3250

Show 1 more supply zone

3250, Hochbehälter 2

Stadtgem. Wieselburg

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

Water hardness

18.9 °dH

Hardness range hard

Key values 3250, Hochbehälter 2
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	14 mg/l	50 mg/l	28 %	Single value · 3250, Hochbehälter 2
Sulphate	25 mg/l	250 mg/l	10 %	Single value · 3250, Hochbehälter 2
Sodium	13,1 mg/l	200 mg/l	7 %	Single value · 3250, Hochbehälter 2

Show all recorded parameters (11 — most recent value per parameter)

Chemical parameters (1)

Chemical parameters – 3250, Hochbehälter 2
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	14 mg/l	50 mg/l	28 %	Single value · 3250, Hochbehälter 2

Indicator parameters (5)

Indicator parameters – 3250, Hochbehälter 2
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	17 mg/l	200 mg/l	9 %	Single value · 3250, Hochbehälter 2
Conductivity (25 °C)	598 µS/cm	2,500 µS/cm	—	Single value · 3250, Hochbehälter 2
pH	7,4	6,5–9,5	—	Single value · 3250, Hochbehälter 2
Sodium	13,1 mg/l	200 mg/l	7 %	Single value · 3250, Hochbehälter 2
Sulphate	25 mg/l	250 mg/l	10 %	Single value · 3250, Hochbehälter 2

Further parameters (5)

Further parameters – 3250, Hochbehälter 2
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	98,2 mg/l	400 mg/l	25 %	Single value · 3250, Hochbehälter 2
Carbonate hardness	17,1 °dH	—	—	Single value · 3250, Hochbehälter 2
Magnesium	22,3 mg/l	150 mg/l	15 %	Single value · 3250, Hochbehälter 2
Potassium	3,5 mg/l	50 mg/l	7 %	Single value · 3250, Hochbehälter 2
Total hardness	18,9 °dH	—	—	Single value · 3250, Hochbehälter 2

Source: https://www.trinkwasserinfo.at/datenbank?no_cache=1&tx_abatrinkwdb_pi1_anlagenid=WL-480%2F020267&tx_abatrinkwdb_pi1_plz=3250&tx_abatrinkwdb_pi1_suche=1&cHash=f0cb482b9dd103c744675cebfd27b46b · 2026-04-21 · 2026-04-21 · retrieved on 08/08/2026

Postcodes in this zone: 3250

Frequently asked questions about drinking water in Lyss

How hard is the water in Lyss?: Evolon AG publishes a total hardness of 22.5 °fH for the supply zone Lyss — that corresponds to 12.6 °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 Lyss?: Evolon AG publishes a nitrate value of 10.55 mg/l for the supply zone Lyss. The statutory parametric value is 40 mg/l; the measured value represents 26 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Lyss?: Evolon AG. The values shown here come from the supply zone Lyss 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.