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Tap water quality, city by city, with real official data and tested guides to help you manage it daily.

Data from Hub'Eau (BRGM / French Ministry of Health), updated monthly.
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Tap water hardness in Switzerland

Data from 89 communes in Suisse romande. Average: 24°fH. Source: cantonal utilities 2024–2026.

Hover over a canton to see details
Very soft
Soft
Moderate
Hard
Very hard

Data: cantonal utilities (EauSud, SINEF, ABV, SIG, Viteos) 2024–2026. Click a canton to explore cities.

Browse by canton

Fribourg25°fHVaud23°fHValais18°fHGenève13°fHNeuchâtel25°fHJura26°fH

About Swiss tap water

Switzerland's French-speaking cantons draw water from a diverse mix of alpine springs, rivers and lakes. Hardness varies from extremely soft in Martigny (3.3°fH) to quite hard in Payerne (44.4°fH).

Valais benefits from alpine glacier runoff, resulting in very soft to soft water. Geneva and western Vaud draw from Lake Geneva, yielding soft water (12–20°fH). The Fribourg plateau has harder water (28–38°fH) due to limestone geology.