Water hardness in Issoire
2 °fH soft
Tap water in Issoire is soft: 2 °fH (20 mg/L · 1.2 gpg · 1.1 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 63178 (2026-08) · data checked 2026-10-19
Issoire in Puy-de-Dôme is served by the SME de la région d'Issoire (Suez). The area rests on volcanic and granitic rock without limestone: 20 mg/L CaCO₃, very soft water. Scale is practically absent.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 2 °fH |
|---|---|
| Utility | Sme De La Region D'Issoire (Suez) |
How Issoire compares
- Tap water in Issoire is 92 % softer than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 32738 of 33641 in France (1 = hardest); 3 % of these cities have softer water.
- In Puy-de-Dôme it is number 285 of 419 cities; the regional median is 5.3 °fH.
- Nearest city with clearly softer water: Olloix, 18 km away (1.5 °fH).
- Nearest city with clearly harder water: Orbeil, 3 km away (10.6 °fH).
Ranking of the hardest and softest water in France →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Issoire
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 1 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Issoire water hard or soft?
It is soft: 20 mg/L as CaCO₃ (1.2 gpg, 1.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Issoire safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
How many grains per gallon is Issoire water?
1.2 gpg, equal to 1.1 °dH, 2 °fH or 20 mg/L calcium carbonate.
What dishwasher salt setting should I use in Issoire?
For 20 mg/L (1.1 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Issoire?
No. With soft water a softener adds nothing.
Source
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 63178 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 63178 · Outdated figure? Tell us