Water hardness in Blanquefort (Gironde)
27.8 °fH very hard
Tap water in Blanquefort (Gironde) is very hard: 27.8 °fH (278 mg/L · 16.2 gpg · 15.6 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 33056 (2026-08) · data checked 2026-10-19
Range across supply zones: 250–306 mg/L.
Blanquefort in Gironde is supplied by the Bordeaux Métropole water utility, which draws from the deep Eocene and Oligocene aquifers (according to its quality report). These limestone aquifers give 278 mg/L CaCO₃, ranging from 250 to 306 mg/L. The water 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 | 27.8 °fH |
|---|---|
| Utility | Regie De L'Eau Bordeaux Metropole |
How Blanquefort (Gironde) compares
- Tap water in Blanquefort (Gironde) is 16 % harder than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 11686 of 33641 in France (1 = hardest); 65 % of these cities have softer water.
- In Gironde it is number 86 of 534 cities; the regional median is 17.5 °fH.
- Nearest city with clearly softer water: Le Taillan-Médoc, 3 km away (17.9 °fH).
- Nearest city with clearly harder water: Paillet, 33 km away (35.3 °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 Blanquefort
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 16 °dH |
| AEG / Electrolux | 4 |
| Beko | 4th |
| Hoover | S2 |
| 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 Blanquefort (Gironde) water hard or soft?
It is very hard: 278 mg/L as CaCO₃ (16.2 gpg, 15.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Blanquefort (Gironde) 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 Blanquefort (Gironde) water?
16.2 gpg, equal to 15.6 °dH, 27.8 °fH or 278 mg/L calcium carbonate.
What dishwasher salt setting should I use in Blanquefort (Gironde)?
For 278 mg/L (15.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Blanquefort (Gironde)?
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 33056 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 33056 · Outdated figure? Tell us