Water hardness in Pertuis
34.7 °fH very hard
Tap water in Pertuis is very hard: 34.7 °fH (347 mg/L · 20.3 gpg · 19.4 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 84089 (2026-08) · data checked 2026-10-19
Pertuis in Vaucluse is served by the Syndicat Durance Luberon, which draws on the Durance river system. This Alpine river crosses large limestone massifs before reaching Provence, hence the very high 347 mg/L CaCO₃. Limescale in washing machines and heating elements builds up fast.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 34.7 °fH |
|---|---|
| Utility | Syndicat Durance Luberon |
How Pertuis compares
- Tap water in Pertuis is 45 % harder than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 3041 of 33641 in France (1 = hardest); 91 % of these cities have softer water.
- In Vaucluse it is number 8 of 151 cities; the regional median is 27.8 °fH.
- Nearest city with clearly softer water: Le Puy-Sainte-Réparade, 6 km away (17.6 °fH).
- Nearest city with clearly harder water: Bras, 44 km away (45.6 °fH).
Ranking of the hardest and softest water in France →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Pertuis
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 19 °dH |
| AEG / Electrolux | 5 |
| Beko | 5th |
| Hoover | S3 |
| LG | H3 |
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 Pertuis water hard or soft?
It is very hard: 347 mg/L as CaCO₃ (20.3 gpg, 19.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Pertuis 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 Pertuis water?
20.3 gpg, equal to 19.4 °dH, 34.7 °fH or 347 mg/L calcium carbonate.
What dishwasher salt setting should I use in Pertuis?
For 347 mg/L (19.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Pertuis?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 84089 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 84089 · Outdated figure? Tell us