Water hardness in Auvergne-Rhône-Alpes
The Auvergne-Rhône-Alpes region has typical water hardness of 5–35°f (French degrees). This hardness is explained by the local geology: variable (volcanic in the west, limestone in the east).
The main cities concerned: Lyon, Grenoble, Clermont-Ferrand, Saint-Étienne.
To find out the exact hardness for your municipality, visit qualite-eau.fr (French Ministry of Health portal) or check our complete map of water hardness in France.
Soft water in Auvergne-Rhône-Alpes: should you still protect yourself?
With a hardness of 5–35°f, water in Auvergne-Rhône-Alpes ranges from very soft to soft. Limescale is less problematic than in Île-de-France or the North, but:
- Some municipalities may have harder water than the regional average
- Soft water can be aggressive (negative Langelier index), promoting corrosion
- LIMPEO also protects against micro-deposits that accumulate over the long term
The LIMPEO solution for Auvergne-Rhône-Alpes
LIMPEO, designed by JAEGER SAS, works regardless of water hardness. It converts calcite into aragonite using electromagnetic waves:
- 88% scale reduction — scientifically validated
- 0 chemicals, 0 salt — water retains its minerals
- 0 maintenance for a minimum of 10 years
- Installation in 10 minutes without a plumber
Discover our technology, review the scientific studies and explore our product range. Calculate your savings with our online tools.
FAQ — Hard water in Auvergne-Rhône-Alpes
What is the water hardness in Lyon?
The typical hardness in Lyon is 5–35°f. The exact value varies by neighbourhood and water source. Check qualite-eau.fr for your precise address.
Does LIMPEO work with water at 5–35°f?
Yes. LIMPEO converts calcite into aragonite regardless of calcium concentration. Even with relatively soft water, LIMPEO protects your appliances over the long term.