Water hardness in Ozoir-la-Ferrière
27.8 °fH very hard
Tap water in Ozoir-la-Ferrière 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 77350 (2026-06) · data checked 2026-10-19
Ozoir-la-Ferrière in Seine-et-Marne receives Veolia water from the Marne and Oise area. In the Brie plateau, regional groundwater and river water cross limestone and gypsum layers of the Paris Basin, hence 278 mg/L CaCO₃. Scale builds up quickly in water heaters and dishwashers.
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 | Veolia Eau - Territoire Marne & Oise |
How Ozoir-la-Ferrière compares
- Tap water in Ozoir-la-Ferrière 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 Seine-et-Marne it is number 234 of 500 cities; the regional median is 27.7 °fH.
- Nearest city with clearly softer water: Villeneuve-sous-Dammartin, 30 km away (20.4 °fH).
- Nearest city with clearly harder water: Tigeaux, 17 km away (40.9 °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 Ozoir-la-Ferrière
| 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 Ozoir-la-Ferrière 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 Ozoir-la-Ferrière 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 Ozoir-la-Ferrière 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 Ozoir-la-Ferrière?
For 278 mg/L (15.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Ozoir-la-Ferrière?
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 77350 (2026-06). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 77350 · Outdated figure? Tell us