Water hardness in Le Plessis-Trévise
26.9 °fH very hard
Tap water in Le Plessis-Trévise is very hard: 26.9 °fH (269 mg/L · 15.7 gpg · 15.1 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 94059 (2026-08) · data checked 2026-10-19
Le Plessis-Trévise in Val-de-Marne is served by a Veolia network for the Marne and Oise area. Drinking water in the Paris region comes largely from treated river water (Seine, Marne, Oise), and the Paris Basin is rich in limestone. The result is very hard water at 269 mg/L CaCO₃, which leaves scale on taps and in kettles.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 26.9 °fH |
|---|---|
| Utility | Veolia Eau-Territoire Marne & Oise |
How Le Plessis-Trévise compares
- Tap water in Le Plessis-Trévise is 13 % harder than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 12932 of 33641 in France (1 = hardest); 61 % of these cities have softer water.
- In Val-de-Marne it is number 14 of 47 cities; the regional median is 26.2 °fH.
- Nearest city with clearly softer water: Villeneuve-la-Garenne, 23 km away (18 °fH).
- Nearest city with clearly harder water: Le Blanc-Mesnil, 16 km away (36.7 °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 Le Plessis-Trévise
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °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 Le Plessis-Trévise water hard or soft?
It is very hard: 269 mg/L as CaCO₃ (15.7 gpg, 15.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Le Plessis-Trévise 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 Le Plessis-Trévise water?
15.7 gpg, equal to 15.1 °dH, 26.9 °fH or 269 mg/L calcium carbonate.
What dishwasher salt setting should I use in Le Plessis-Trévise?
For 269 mg/L (15.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Le Plessis-Trévise?
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 94059 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 94059 · Outdated figure? Tell us