Tap water hardness in Yvelines
We have published hardness data for 222 cities in Yvelines. The median is 23 °fH; the hardest water is in Drocourt (39.4 °fH), the softest in Maisons-Laffitte (9.8 °fH).
99 % of these cities have hard or very hard water (over 120 mg/L).
Largest places, hardest first
| °fH | mg/L | ||
|---|---|---|---|
| Lainville-en-Vexin | 37.6 | 376 | very hard |
| Jambville | 36.5 | 365 | very hard |
| Vaux-sur-Seine | 34.7 | 347 | very hard |
| Évecquemont | 34.7 | 347 | very hard |
| Longnes | 34.5 | 345 | very hard |
| Conflans-Sainte-Honorine | 34.4 | 344 | very hard |
| Andrésy | 34.4 | 344 | very hard |
| Chanteloup-les-Vignes | 34.4 | 344 | very hard |
| Oinville-sur-Montcient | 33.1 | 331 | very hard |
| Saint-Martin-la-Garenne | 33.1 | 331 | very hard |
| Blaru | 33.1 | 331 | very hard |
| Orphin | 31.7 | 317 | very hard |
| Fontenay-Saint-Père | 31.3 | 313 | very hard |
| Hermeray | 31.3 | 313 | very hard |
| Raizeux | 31.3 | 313 | very hard |
| Hardricourt | 31 | 310 | very hard |
| Prunay-en-Yvelines | 30.9 | 309 | very hard |
| Dammartin-en-Serve | 30.7 | 307 | very hard |
| Rochefort-en-Yvelines | 30.4 | 304 | very hard |
| Saint-Arnoult-en-Yvelines | 30.2 | 302 | very hard |
| Ablis | 30.2 | 302 | very hard |
| Sainte-Mesme | 30.2 | 302 | very hard |
| Sonchamp | 30.1 | 301 | very hard |
| Orcemont | 30.1 | 301 | very hard |
| Clairefontaine-en-Yvelines | 30.1 | 301 | very hard |
| La Celle-les-Bordes | 30.1 | 301 | very hard |
| Gazeran | 29.6 | 296 | very hard |
| Saint-Hilarion | 29.6 | 296 | very hard |
| Émancé | 29.6 | 296 | very hard |
| Gargenville | 29.3 | 293 | very hard |
| Bonnelles | 28.4 | 284 | very hard |
| Juziers | 27 | 270 | very hard |
| Mézy-sur-Seine | 27 | 270 | very hard |
| Saint-Rémy-lès-Chevreuse | 26.5 | 265 | very hard |
| Maurecourt | 26.5 | 265 | very hard |
| Chevreuse | 26.4 | 264 | very hard |
| Dampierre-en-Yvelines | 26.4 | 264 | very hard |
| Cernay-la-Ville | 25.7 | 257 | very hard |
| Auffargis | 24.4 | 244 | very hard |
| Gambais | 24.3 | 243 | very hard |
| Bazainville | 24.3 | 243 | very hard |
| Châteaufort | 24.3 | 243 | very hard |
| Maulette | 24.3 | 243 | very hard |
| Mantes-la-Jolie | 23.7 | 237 | very hard |
| Arnouville-lès-Mantes | 23.7 | 237 | very hard |
| Orvilliers | 23.7 | 237 | very hard |
| Rambouillet | 23.6 | 236 | very hard |
| Vélizy-Villacoublay | 23.6 | 236 | very hard |
| Viroflay | 23.6 | 236 | very hard |
| Jouy-en-Josas | 23.6 | 236 | very hard |
| Porcheville | 23.6 | 236 | very hard |
| Les Loges-en-Josas | 23.6 | 236 | very hard |
| Rosny-sur-Seine | 23.5 | 235 | very hard |
| Buchelay | 23.5 | 235 | very hard |
| Septeuil | 23.4 | 234 | very hard |
| Beynes | 23.3 | 233 | very hard |
| Follainville-Dennemont | 23.3 | 233 | very hard |
| Guernes | 23.3 | 233 | very hard |
| Magnanville | 23.2 | 232 | very hard |
| Issou | 23.2 | 232 | very hard |
| Mareil-sur-Mauldre | 23.1 | 231 | very hard |
| Magny-les-Hameaux | 23 | 230 | very hard |
| Le Perray-en-Yvelines | 23 | 230 | very hard |
| Les Essarts-le-Roi | 23 | 230 | very hard |
| Le Mesnil-Saint-Denis | 23 | 230 | very hard |
| Jouars-Pontchartrain | 23 | 230 | very hard |
| Houdan | 23 | 230 | very hard |
| Garancières | 23 | 230 | very hard |
| La Queue-les-Yvelines | 23 | 230 | very hard |
| Lévis-Saint-Nom | 23 | 230 | very hard |
| Saint-Rémy-l'Honoré | 23 | 230 | very hard |
| Galluis | 23 | 230 | very hard |
| Le Tremblay-sur-Mauldre | 23 | 230 | very hard |
| Grosrouvre | 23 | 230 | very hard |
| Bréval | 22.9 | 229 | very hard |
| Neauphlette | 22.9 | 229 | very hard |
| Limay | 22.8 | 228 | very hard |
| Montfort-l'Amaury | 22.8 | 228 | very hard |
| Méré | 22.8 | 228 | very hard |
| Neauphle-le-Vieux | 22.8 | 228 | very hard |
| Les Mesnuls | 22.8 | 228 | very hard |
| Thoiry | 22.5 | 225 | very hard |
| Auteuil | 22.5 | 225 | very hard |
| Saulx-Marchais | 22.5 | 225 | very hard |
| Sartrouville | 22 | 220 | very hard |
| Houilles | 22 | 220 | very hard |
| Le Mesnil-le-Roi | 22 | 220 | very hard |
| Triel-sur-Seine | 21.9 | 219 | very hard |
| Maule | 20.9 | 209 | very hard |
| Le Port-Marly | 20.7 | 207 | very hard |
| Verneuil-sur-Seine | 20 | 200 | very hard |
| Vernouillet | 20 | 200 | very hard |
| Bullion | 19.9 | 199 | very hard |
| Ecquevilly | 19.6 | 196 | very hard |
| Montesson | 19.5 | 195 | very hard |
| Saint-Cyr-l'École | 19.3 | 193 | very hard |
| Vert | 19.3 | 193 | very hard |
| Saint-Germain-de-la-Grange | 19.2 | 192 | very hard |
| La Celle-Saint-Cloud | 19.1 | 191 | very hard |
| Bougival | 19.1 | 191 | very hard |
| Buc | 18.9 | 189 | very hard |
| Chapet | 18.8 | 188 | very hard |
| Chavenay | 18.6 | 186 | very hard |
| Toussus-le-Noble | 18.6 | 186 | very hard |
| Poissy | 18.5 | 185 | very hard |
| Le Pecq | 18.5 | 185 | very hard |
| Plaisir | 18.4 | 184 | very hard |
| Carrières-sur-Seine | 18.4 | 184 | very hard |
| Neauphle-le-Château | 18.4 | 184 | very hard |
| Thiverval-Grignon | 18.4 | 184 | very hard |
| Maurepas | 18.3 | 183 | very hard |
| Mareil-Marly | 18.3 | 183 | very hard |
| Les Clayes-sous-Bois | 18.2 | 182 | very hard |
| Carrières-sous-Poissy | 18.2 | 182 | very hard |
| Marly-le-Roi | 18.1 | 181 | very hard |
| Le Vésinet | 18.1 | 181 | very hard |
| Villepreux | 18.1 | 181 | very hard |
| Bazemont | 18.1 | 181 | very hard |
| Trappes | 18 | 180 | very hard |
| Élancourt | 18 | 180 | very hard |
| La Verrière | 18 | 180 | very hard |
| Orgeval | 18 | 180 | very hard |
| Chambourcy | 18 | 180 | very hard |
| Villennes-sur-Seine | 18 | 180 | very hard |
| Saint-Nom-la-Bretèche | 18 | 180 | very hard |
| Coignières | 18 | 180 | very hard |
| Feucherolles | 18 | 180 | very hard |
| Morainvilliers | 18 | 180 | very hard |
| Crespières | 18 | 180 | very hard |
| Médan | 18 | 180 | very hard |
| Les Alluets-le-Roi | 18 | 180 | very hard |
| Aigremont | 18 | 180 | very hard |
| Chatou | 17.9 | 179 | hard |
| Montigny-le-Bretonneux | 17.8 | 178 | hard |
| Guyancourt | 17.8 | 178 | hard |
| Bois-d'Arcy | 17.8 | 178 | hard |
| Fontenay-le-Fleury | 17.8 | 178 | hard |
| Voisins-le-Bretonneux | 17.8 | 178 | hard |
| L'Étang-la-Ville | 17.8 | 178 | hard |
| Saint-Germain-en-Laye | 17.7 | 177 | hard |
| Bouafle | 17.7 | 177 | hard |
| Croissy-sur-Seine | 17.6 | 176 | hard |
| Freneuse | 17.6 | 176 | hard |
| Limetz-Villez | 17.6 | 176 | hard |
| Bennecourt | 17.6 | 176 | hard |
| Les Bréviaires | 17.4 | 174 | hard |
| Bonnières-sur-Seine | 14.2 | 142 | hard |
| Saint-Léger-en-Yvelines | 11.4 | 114 | moderately hard |
| Poigny-la-Forêt | 11.4 | 114 | moderately hard |
| Maisons-Laffitte | 9.8 | 98 | moderately hard |
Other places (72)
- Allainville 30.2 °fH
- Andelu 22.5 °fH
- Auffreville-Brasseuil 19.3 °fH
- Autouillet 22.5 °fH
- Bazoches-sur-Guyonne 22.8 °fH
- Boinville-le-Gaillard 30.2 °fH
- Boinvilliers 22.8 °fH
- Boissets 23.7 °fH
- Boissy-Mauvoisin 32 °fH
- Boissy-sans-Avoir 23 °fH
- Breuil-Bois-Robert 19.4 °fH
- Brueil-en-Vexin 31.3 °fH
- Chaufour-lès-Bonnières 32 °fH
- Choisel 25.7 °fH
- Civry-la-Forêt 23.7 °fH
- Courgent 36.3 °fH
- Cravent 32 °fH
- Dannemarie 23.2 °fH
- Davron 18 °fH
- Drocourt 39.4 °fH
- Favrieux 23.5 °fH
- Flacourt 25.2 °fH
- Flexanville 22.5 °fH
- Flins-Neuve-Église 34.5 °fH
- Fontenay-Mauvoisin 23.5 °fH
- Gaillon-sur-Montcient 33.1 °fH
- Gambaiseuil 23 °fH
- Gommecourt 17.6 °fH
- Goupillières 22.5 °fH
- Goussonville 23.7 °fH
- Gressey 23.7 °fH
- Guitrancourt 23.7 °fH
- Hargeville 23.7 °fH
- Herbeville 18.1 °fH
- Jouy-Mauvoisin 23.5 °fH
- Jumeauville 23.7 °fH
- La Villeneuve-en-Chevrie 17.6 °fH
- Le Tertre-Saint-Denis 23.5 °fH
- Lommoye 32 °fH
- Longvilliers 29.6 °fH
- Marcq 22.9 °fH
- Mareil-le-Guyon 22.5 °fH
- Ménerville 32 °fH
- Méricourt 17.9 °fH
- Millemont 23 °fH
- Milon-la-Chapelle 23 °fH
- Mondreville 37.4 °fH
- Montainville 23.3 °fH
- Montalet-le-Bois 36.5 °fH
- Montchauvet 31.4 °fH
- Mousseaux-sur-Seine 17.9 °fH
- Mulcent 35.9 °fH
- Notre-Dame-de-la-Mer 25.3 °fH
- Orsonville 30.2 °fH
- Paray-Douaville 30.2 °fH
- Perdreauville 23.5 °fH
- Ponthévrard 30.2 °fH
- Rolleboise 17.9 °fH
- Rosay 22.8 °fH
- Sailly 31.3 °fH
- Saint-Forget 23 °fH
- Saint-Illiers-la-Ville 32 °fH
- Saint-Illiers-le-Bois 32 °fH
- Saint-Lambert 23 °fH
- Saint-Martin-de-Bréthencourt 28.6 °fH
- Senlisse 25.7 °fH
- Soindres 23.2 °fH
- Tilly 34.5 °fH
- Vicq 22.5 °fH
- Vieille-Église-en-Yvelines 23 °fH
- Villette 23.5 °fH
- Villiers-le-Mahieu 22.5 °fH