Water hardness in Carvin
35.8 °fH very hard
Tap water in Carvin is very hard: 35.8 °fH (358 mg/L · 20.9 gpg · 20.1 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 62215 (2026-08) · data checked 2026-10-19
Carvin in Pas-de-Calais is served by Veolia (Artois-Douaisis). Water in the old mining basin comes from the chalk aquifer, which dissolves a lot of limestone: 358 mg/L CaCO₃. The water is very hard; softeners are often considered in the area.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 35.8 °fH |
|---|---|
| Utility | Veolia Artois Douaisis |
How Carvin compares
- Tap water in Carvin is 50 % harder than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 2217 of 33641 in France (1 = hardest); 93 % of these cities have softer water.
- In Pas-de-Calais it is number 156 of 880 cities; the regional median is 32.9 °fH.
- Nearest city with clearly softer water: Faumont, 13 km away (25.9 °fH).
- Nearest city with clearly harder water: Billy-Berclau, 7 km away (46.4 °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 Carvin
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 20 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| 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 Carvin water hard or soft?
It is very hard: 358 mg/L as CaCO₃ (20.9 gpg, 20.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Carvin 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 Carvin water?
20.9 gpg, equal to 20.1 °dH, 35.8 °fH or 358 mg/L calcium carbonate.
What dishwasher salt setting should I use in Carvin?
For 358 mg/L (20.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Carvin?
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 62215 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 62215 · Outdated figure? Tell us