Water hardness in Chambray-lès-Tours
20.5 °fH very hard
Tap water in Chambray-lès-Tours is very hard: 20.5 °fH (205 mg/L · 12 gpg · 11.5 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 37050 (2026-08) · data checked 2026-10-19
Range across supply zones: 106–304 mg/L.
Chambray-lès-Tours (Indre-et-Loire) is supplied by Veolia Eau Cge. Sanitary control data (ARS, SISE-Eaux, commune 37050, August 2026) give a measured median of 205 mg/L CaCO₃ (20.5 °fH). Readings run from 106 to 304 mg/L, so the spread is wide. The band used is very hard.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 20.5 °fH |
|---|---|
| Utility | Veolia Eau Cge |
How Chambray-lès-Tours compares
- Tap water in Chambray-lès-Tours is 14 % softer than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 19947 of 33641 in France (1 = hardest); 41 % of these cities have softer water.
- In Indre-et-Loire it is number 206 of 272 cities; the regional median is 24.9 °fH.
- Nearest city with clearly softer water: Tours, 6 km away (12.3 °fH).
- Nearest city with clearly harder water: Joué-lès-Tours, 4 km away (30.4 °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 Chambray-lès-Tours
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °dH |
| AEG / Electrolux | 3 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
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 Chambray-lès-Tours water hard or soft?
It is very hard: 205 mg/L as CaCO₃ (12 gpg, 11.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Chambray-lès-Tours 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 Chambray-lès-Tours water?
12 gpg, equal to 11.5 °dH, 20.5 °fH or 205 mg/L calcium carbonate.
What dishwasher salt setting should I use in Chambray-lès-Tours?
For 205 mg/L (11.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Chambray-lès-Tours?
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 37050 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 37050 · Outdated figure? Tell us