Water hardness in Graulhet
9.7 °fH moderately hard
Tap water in Graulhet is moderately hard: 9.7 °fH (97 mg/L · 5.7 gpg · 5.4 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 81105 (2026-08) · data checked 2026-10-19
Range across supply zones: 87–162 mg/L.
Graulhet (Tarn) has a median hardness of 97 mg/L CaCO₃, classed as moderate, but values range from 87 to 162 mg/L. Several services supply the commune: R.C.E.A.C du Bassin Graulhétois, Smaep du Gaillacois and Veolia Eau C.G.E. (SM du Dadou). Source: SISE-Eaux sanitary monitoring (ARS), commune 81105, August 2026.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 9.7 °fH |
|---|---|
| Utility | R.C.E.A.C Du Bassin Graulhétois; Smaep Du Gaillacois; Veolia Eau C.G.E. (Sm Du Dadou) |
How Graulhet compares
- Tap water in Graulhet is 59 % softer than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 29111 of 33641 in France (1 = hardest); 13 % of these cities have softer water.
- In Tarn it is number 138 of 314 cities; the regional median is 9.3 °fH.
- Nearest city with clearly softer water: Puylaurens, 21 km away (6.7 °fH).
- Nearest city with clearly harder water: Busque, 3 km away (16.2 °fH).
Ranking of the hardest and softest water in France →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Graulhet
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Graulhet water hard or soft?
It is moderately hard: 97 mg/L as CaCO₃ (5.7 gpg, 5.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Graulhet 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 Graulhet water?
5.7 gpg, equal to 5.4 °dH, 9.7 °fH or 97 mg/L calcium carbonate.
What dishwasher salt setting should I use in Graulhet?
For 97 mg/L (5.4 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Graulhet?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 81105 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 81105 · Outdated figure? Tell us