How hard is the water in Mendrisio?

Trinkwasserverband Rheintal publishes a total hardness of 14.7 °dH for the supply zone 6841, GWPW Mäder (hardness range hard). 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: 2024-09-07, retrieved on 08/08/2026.

How much nitrate is in the drinking water in Mendrisio?

Trinkwasserverband Rheintal publishes a nitrate value of 4,3 mg/l for the supply zone 6841, GWPW Mäder. The statutory parametric value is 50 mg/l; the measured value represents 9 % of the parametric value. Basis: 2024-09-07, retrieved on 08/08/2026.

Who supplies the drinking water in Mendrisio?

Trinkwasserverband Rheintal. The values shown here come from the supply zone 6841, GWPW Mäder 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 Mendrisio

4 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.

6841, GWPW Mäder

Trinkwasserverband Rheintal

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 07/09/2024. 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

14.7 °dH

Hardness range hard

Key values 6841, GWPW Mäder
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	4,3 mg/l	50 mg/l	9 %	Maximum · 6841, GWPW Mäder
Sulphate	46 mg/l	250 mg/l	18 %	Maximum · 6841, GWPW Mäder
Sodium	5,5 mg/l	200 mg/l	3 %	Maximum · 6841, GWPW Mäder

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

Chemical parameters (1)

Chemical parameters – 6841, GWPW Mäder
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	4,3 mg/l	50 mg/l	9 %	Maximum · 6841, GWPW Mäder

Indicator parameters (5)

Indicator parameters – 6841, GWPW Mäder
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	6,2 mg/l	200 mg/l	3 %	Maximum · 6841, GWPW Mäder
Conductivity (25 °C)	507 µS/cm	2,500 µS/cm	—	Maximum · 6841, GWPW Mäder
pH	7,6	6,5–9,5	—	Maximum · 6841, GWPW Mäder
Sodium	5,5 mg/l	200 mg/l	3 %	Maximum · 6841, GWPW Mäder
Sulphate	46 mg/l	250 mg/l	18 %	Maximum · 6841, GWPW Mäder

Further parameters (5)

Further parameters – 6841, GWPW Mäder
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	77 mg/l	400 mg/l	19 %	Maximum · 6841, GWPW Mäder
Carbonate hardness	11,7 °dH	—	—	Maximum · 6841, GWPW Mäder
Magnesium	17 mg/l	150 mg/l	11 %	Maximum · 6841, GWPW Mäder
Potassium	1,6 mg/l	50 mg/l	3 %	Maximum · 6841, GWPW Mäder
Total hardness	14,7 °dH	—	—	Maximum · 6841, GWPW Mäder

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://www.trinkwasserinfo.at/datenbank?no_cache=1&tx_abatrinkwdb_pi1_anlagenid=TWP_0008&tx_abatrinkwdb_pi1_plz=6841&tx_abatrinkwdb_pi1_suche=1&cHash=db852de7d252a64e7da10ea93628e892 · 2024-09-07 · 2024-09-07 · retrieved on 08/08/2026

Postcodes in this zone: 6850

Show 3 more supply zones

6845, PW Klien

Trinkwasserverband Rheintal

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 15/10/2024. 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

12.5 °dH

Hardness range medium

Key values 6845, PW Klien
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	6,2 mg/l	50 mg/l	12 %	Maximum · 6845, PW Klien
Sulphate	22 mg/l	250 mg/l	9 %	Maximum · 6845, PW Klien
Sodium	5 mg/l	200 mg/l	3 %	Maximum · 6845, PW Klien

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

Chemical parameters (1)

Chemical parameters – 6845, PW Klien
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	6,2 mg/l	50 mg/l	12 %	Maximum · 6845, PW Klien

Indicator parameters (5)

Indicator parameters – 6845, PW Klien
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	2,7 mg/l	200 mg/l	1 %	Maximum · 6845, PW Klien
Conductivity (25 °C)	396 µS/cm	2,500 µS/cm	—	Maximum · 6845, PW Klien
pH	7,6	6,5–9,5	—	Maximum · 6845, PW Klien
Sodium	5 mg/l	200 mg/l	3 %	Maximum · 6845, PW Klien
Sulphate	22 mg/l	250 mg/l	9 %	Maximum · 6845, PW Klien

Further parameters (5)

Further parameters – 6845, PW Klien
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	71 mg/l	400 mg/l	18 %	Maximum · 6845, PW Klien
Carbonate hardness	11,6 °dH	—	—	Maximum · 6845, PW Klien
Magnesium	11 mg/l	150 mg/l	7 %	Maximum · 6845, PW Klien
Potassium	0,9 mg/l	50 mg/l	2 %	Maximum · 6845, PW Klien
Total hardness	12,5 °dH	—	—	Maximum · 6845, PW Klien

Source: https://www.trinkwasserinfo.at/datenbank?no_cache=1&tx_abatrinkwdb_pi1_anlagenid=TWP_0008&tx_abatrinkwdb_pi1_plz=6845&tx_abatrinkwdb_pi1_suche=1&cHash=b8ff746333c1c803ae5813c450232c25 · 2024-10-15 · 2024-10-15 · retrieved on 08/08/2026

Postcodes in this zone: 6850

6850, Filteranlage Fussenegg

Trinkwasserverband Rheintal

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

Water hardness

9.3 °dH

Hardness range medium

Key values 6850, Filteranlage Fussenegg
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	1,9 mg/l	50 mg/l	4 %	Maximum · 6850, Filteranlage Fussenegg
Sulphate	11 mg/l	250 mg/l	4 %	Maximum · 6850, Filteranlage Fussenegg
Sodium	2,8 mg/l	200 mg/l	1 %	Maximum · 6850, Filteranlage Fussenegg

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

Chemical parameters (1)

Chemical parameters – 6850, Filteranlage Fussenegg
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	1,9 mg/l	50 mg/l	4 %	Maximum · 6850, Filteranlage Fussenegg

Indicator parameters (5)

Indicator parameters – 6850, Filteranlage Fussenegg
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	1 mg/l	200 mg/l	0.5 %	Maximum · 6850, Filteranlage Fussenegg
Conductivity (25 °C)	290 µS/cm	2,500 µS/cm	—	Maximum · 6850, Filteranlage Fussenegg
pH	7,8	6,5–9,5	—	Maximum · 6850, Filteranlage Fussenegg
Sodium	2,8 mg/l	200 mg/l	1 %	Maximum · 6850, Filteranlage Fussenegg
Sulphate	11 mg/l	250 mg/l	4 %	Maximum · 6850, Filteranlage Fussenegg

Further parameters (5)

Further parameters – 6850, Filteranlage Fussenegg
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	58 mg/l	400 mg/l	14 %	Maximum · 6850, Filteranlage Fussenegg
Carbonate hardness	9,2 °dH	—	—	Maximum · 6850, Filteranlage Fussenegg
Magnesium	5,8 mg/l	150 mg/l	4 %	Maximum · 6850, Filteranlage Fussenegg
Potassium	0,5 mg/l	50 mg/l	1 %	Maximum · 6850, Filteranlage Fussenegg
Total hardness	9,3 °dH	—	—	Maximum · 6850, Filteranlage Fussenegg

Source: https://www.trinkwasserinfo.at/datenbank?no_cache=1&tx_abatrinkwdb_pi1_anlagenid=TWP_0008&tx_abatrinkwdb_pi1_plz=6850&tx_abatrinkwdb_pi1_suche=1&cHash=51140d5f78f3122c30f726d9c03437a8 · 2024-10-15 · 2024-10-15 · retrieved on 08/08/2026

Postcodes in this zone: 6850

6850, Quellen Watzenegg, HB

Trinkwasserverband Rheintal

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

Water hardness

11.5 °dH

Hardness range medium

Key values 6850, Quellen Watzenegg, HB
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	3,8 mg/l	50 mg/l	8 %	Maximum · 6850, Quellen Watzenegg, HB
Sulphate	12 mg/l	250 mg/l	5 %	Maximum · 6850, Quellen Watzenegg, HB
Sodium	2,6 mg/l	200 mg/l	1 %	Maximum · 6850, Quellen Watzenegg, HB

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

Chemical parameters (1)

Chemical parameters – 6850, Quellen Watzenegg, HB
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	3,8 mg/l	50 mg/l	8 %	Maximum · 6850, Quellen Watzenegg, HB

Indicator parameters (5)

Indicator parameters – 6850, Quellen Watzenegg, HB
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	1,1 mg/l	200 mg/l	0.5 %	Maximum · 6850, Quellen Watzenegg, HB
Conductivity (25 °C)	353 µS/cm	2,500 µS/cm	—	Maximum · 6850, Quellen Watzenegg, HB
pH	7,7	6,5–9,5	—	Maximum · 6850, Quellen Watzenegg, HB
Sodium	2,6 mg/l	200 mg/l	1 %	Maximum · 6850, Quellen Watzenegg, HB
Sulphate	12 mg/l	250 mg/l	5 %	Maximum · 6850, Quellen Watzenegg, HB

Further parameters (5)

Further parameters – 6850, Quellen Watzenegg, HB
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	59 mg/l	400 mg/l	15 %	Maximum · 6850, Quellen Watzenegg, HB
Carbonate hardness	11,1 °dH	—	—	Maximum · 6850, Quellen Watzenegg, HB
Magnesium	14 mg/l	150 mg/l	9 %	Maximum · 6850, Quellen Watzenegg, HB
Potassium	0,9 mg/l	50 mg/l	2 %	Maximum · 6850, Quellen Watzenegg, HB
Total hardness	11,5 °dH	—	—	Maximum · 6850, Quellen Watzenegg, HB

Postcodes in this zone: 6850

Frequently asked questions about drinking water in Mendrisio

How hard is the water in Mendrisio?: Trinkwasserverband Rheintal publishes a total hardness of 14.7 °dH for the supply zone 6841, GWPW Mäder (hardness range hard). 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: 2024-09-07, retrieved on 08/08/2026.
How much nitrate is in the drinking water in Mendrisio?: Trinkwasserverband Rheintal publishes a nitrate value of 4,3 mg/l for the supply zone 6841, GWPW Mäder. The statutory parametric value is 50 mg/l; the measured value represents 9 % of the parametric value. Basis: 2024-09-07, retrieved on 08/08/2026.
Who supplies the drinking water in Mendrisio?: Trinkwasserverband Rheintal. The values shown here come from the supply zone 6841, GWPW Mäder 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.