Water hardness in Lausanne (canton of Vaud): 13.8°fH, quality index 9/10. Official Swiss cantonal data.
✓ Compliant with sanitary standardsLausanne has very soft water (13.8°fH). No limescale issues at all: your appliances will last longer without special care.
Swiss tap water is subject to the federal Food Act (LDA/LEDAl) and the Ordinance on drinking water (OPBD). The sanitary compliance indicator shows whether the latest cantonal analyses found any non-conformities on parameters such as bacteriology, nitrates or heavy metals.
The TH (Total Hardness) measures calcium and magnesium content. Below 15°fH: very soft. From 15 to 25: soft. From 25 to 32: moderately hard. From 32 to 42: hard. Above 42: very hard. Lausanne's water is soft at 13.8°fH.
Maintenance budget: ~£39/year
For 2 persons, water at 13.8°f deposits around 0.7 kg of limescale per year in your appliances. Estimated cost in descalers, salt and filters.
Calcium: ~22 mg per litre
Your water provides 22 mg of calcium/L, which is 2% of the recommended daily intake.
Filtration not required
Your soft water does not require filtration. A jug filter remains useful for taste.
The tap water hardness in Lausanne is 13.8°fH, corresponding to soft water. In comparison, the Suisse romande average is 24°fH and the Vaud cantonal average is 23°fH.
Yes. The water in Lausanne is sanitary compliant (Swiss Food Act LDA and Drinking Water Ordinance OPBD). The hardness of 13.8°fH affects taste and appliance maintenance, not safety. Swiss tap water is subject to strict regular monitoring by cantonal authorities.
At 13.8°fH, a water softener is optional in Lausanne. Regular descaling (every 1 to 3 months depending on appliance) and a pitcher filter are sufficient to limit limescale buildup.
A hardness of 13.8°fH corresponds to approximately 22 mg of calcium per litre, or 2% of the recommended daily intake. This calcium is not dangerous; hard water can even contribute to your daily calcium intake.
Water in Lausanne is distributed by cantonal utilities in the canton of Vaud (EauSud, SINEF, ABV, OIKEN, SIG, Viteos or municipal services depending on the city). Source: Ville de Lausanne 2025.
Data: official cantonal utilities (EauSud, SINEF, ABV, OIKEN, SIG, Viteos, municipal services) (2024–2026).