Tap water hardness in Val-d'Oise
We have published hardness data for 149 cities in Val-d'Oise. The median is 30.6 °fH; the hardest water is in Asnières-sur-Oise (43.4 °fH), the softest in Louvres (19.1 °fH).
100 % of these cities have hard or very hard water (over 120 mg/L).
Cities in Val-d'Oise, hardest first
| °fH | mg/L | ||
|---|---|---|---|
| Asnières-sur-Oise | 43.4 | 434 | very hard |
| Chaumontel | 43.4 | 434 | very hard |
| Luzarches | 43.4 | 434 | very hard |
| Noisy-sur-Oise | 43.4 | 434 | very hard |
| Saint-Witz | 43.4 | 434 | very hard |
| Seugy | 43.4 | 434 | very hard |
| Survilliers | 43.4 | 434 | very hard |
| Viarmes | 43.4 | 434 | very hard |
| Villeron | 43.4 | 434 | very hard |
| Brignancourt | 41.7 | 417 | very hard |
| Ennery | 41.7 | 417 | very hard |
| Le Thillay | 41.3 | 413 | very hard |
| Vaudherland | 41.3 | 413 | very hard |
| Chennevières-lès-Louvres | 40.6 | 406 | very hard |
| Épiais-lès-Louvres | 40.6 | 406 | very hard |
| Menouville | 40.4 | 404 | very hard |
| Hérouville-en-Vexin | 40.2 | 402 | very hard |
| Livilliers | 40.2 | 402 | very hard |
| Chérence | 39.6 | 396 | very hard |
| Villers-en-Arthies | 39.6 | 396 | very hard |
| Vémars | 39.3 | 393 | very hard |
| Frouville | 39.1 | 391 | very hard |
| Hédouville | 39.1 | 391 | very hard |
| Labbeville | 39.1 | 391 | very hard |
| Montgeroult | 39 | 390 | very hard |
| Aincourt | 38.9 | 389 | very hard |
| Saint-Cyr-en-Arthies | 38.9 | 389 | very hard |
| Seraincourt | 38.5 | 385 | very hard |
| Mours | 38.3 | 383 | very hard |
| Nointel | 38.3 | 383 | very hard |
| Presles | 38.3 | 383 | very hard |
| Haute-Isle | 38 | 380 | very hard |
| Beaumont-sur-Oise | 37.9 | 379 | very hard |
| Persan | 37.9 | 379 | very hard |
| Buhy | 36.8 | 368 | very hard |
| Montreuil-sur-Epte | 36.8 | 368 | very hard |
| Arronville | 36.5 | 365 | very hard |
| Berville | 36.5 | 365 | very hard |
| Frémainville | 36.3 | 363 | very hard |
| Vallangoujard | 36.3 | 363 | very hard |
| Ableiges | 36.2 | 362 | very hard |
| Commeny | 36.2 | 362 | very hard |
| Condécourt | 36.2 | 362 | very hard |
| Le Perchay | 36.2 | 362 | very hard |
| Longuesse | 36.2 | 362 | very hard |
| Sagy | 36.2 | 362 | very hard |
| Théméricourt | 36.2 | 362 | very hard |
| Us | 36.2 | 362 | very hard |
| Vigny | 36.2 | 362 | very hard |
| Saint-Clair-sur-Epte | 35.7 | 357 | very hard |
| Chaussy | 35.1 | 351 | very hard |
| Boisemont | 35 | 350 | very hard |
| Courdimanche | 35 | 350 | very hard |
| Menucourt | 35 | 350 | very hard |
| Vauréal | 35 | 350 | very hard |
| Haravilliers | 34.5 | 345 | very hard |
| Vétheuil | 34.1 | 341 | very hard |
| Ambleville | 33.4 | 334 | very hard |
| Nesles-la-Vallée | 33.4 | 334 | very hard |
| Bruyères-sur-Oise | 33.1 | 331 | very hard |
| Bernes-sur-Oise | 33 | 330 | very hard |
| Cergy | 33 | 330 | very hard |
| Avernes | 32.6 | 326 | very hard |
| Amenucourt | 32.1 | 321 | very hard |
| Bray-et-Lû | 32.1 | 321 | very hard |
| Épiais-Rhus | 31.8 | 318 | very hard |
| Grisy-les-Plâtres | 31.8 | 318 | very hard |
| Champagne-sur-Oise | 31.4 | 314 | very hard |
| L'Isle-Adam | 31.4 | 314 | very hard |
| Omerville | 31.4 | 314 | very hard |
| Parmain | 31.4 | 314 | very hard |
| Theuville | 31.4 | 314 | very hard |
| Puiseux-Pontoise | 31.1 | 311 | very hard |
| Bréançon | 30.8 | 308 | very hard |
| Genainville | 30.6 | 306 | very hard |
| Hodent | 30.6 | 306 | very hard |
| La Chapelle-en-Vexin | 30.6 | 306 | very hard |
| Magny-en-Vexin | 30.6 | 306 | very hard |
| Nucourt | 30.6 | 306 | very hard |
| Saint-Gervais | 30.6 | 306 | very hard |
| Vienne-en-Arthies | 30.5 | 305 | very hard |
| La Roche-Guyon | 29.4 | 294 | very hard |
| Goussainville | 29.3 | 293 | very hard |
| Marly-la-Ville | 29.3 | 293 | very hard |
| Arthies | 29.1 | 291 | very hard |
| Banthelu | 29.1 | 291 | very hard |
| Charmont | 29.1 | 291 | very hard |
| Cléry-en-Vexin | 29.1 | 291 | very hard |
| Guiry-en-Vexin | 29.1 | 291 | very hard |
| Maudétour-en-Vexin | 29.1 | 291 | very hard |
| Wy-dit-Joli-Village | 29.1 | 291 | very hard |
| Génicourt | 28.4 | 284 | very hard |
| Arnouville | 27.9 | 279 | very hard |
| Garges-lès-Gonesse | 27.9 | 279 | very hard |
| Gonesse | 27.9 | 279 | very hard |
| Bonneuil-en-France | 27.6 | 276 | very hard |
| Le Heaulme | 27 | 270 | very hard |
| Neuilly-en-Vexin | 27 | 270 | very hard |
| Pontoise | 26.9 | 269 | very hard |
| Frémécourt | 26.8 | 268 | very hard |
| Belloy-en-France | 26.5 | 265 | very hard |
| Bouqueval | 26.5 | 265 | very hard |
| Châtenay-en-France | 26.5 | 265 | very hard |
| Cormeilles-en-Vexin | 26.5 | 265 | very hard |
| Épinay-Champlâtreux | 26.5 | 265 | very hard |
| Fontenay-en-Parisis | 26.5 | 265 | very hard |
| Jagny-sous-Bois | 26.5 | 265 | very hard |
| Le Mesnil-Aubry | 26.5 | 265 | very hard |
| Le Plessis-Gassot | 26.5 | 265 | very hard |
| Mareil-en-France | 26.5 | 265 | very hard |
| Puiseux-en-France | 26.5 | 265 | very hard |
| Villaines-sous-Bois | 26.5 | 265 | very hard |
| Villiers-le-Sec | 26.5 | 265 | very hard |
| Osny | 26.4 | 264 | very hard |
| Boissy-l'Aillerie | 26.1 | 261 | very hard |
| Santeuil | 26.1 | 261 | very hard |
| Fosses | 25.9 | 259 | very hard |
| Marines | 25.8 | 258 | very hard |
| Le Bellay-en-Vexin | 25.6 | 256 | very hard |
| Moussy | 25.6 | 256 | very hard |
| Roissy-en-France | 25.4 | 254 | very hard |
| Chars | 25.2 | 252 | very hard |
| Courcelles-sur-Viosne | 23.1 | 231 | very hard |
| Jouy-le-Moutier | 22.1 | 221 | very hard |
| Ronquerolles | 22 | 220 | very hard |
| Ézanville | 21.1 | 211 | very hard |
| Écouen | 21 | 210 | very hard |
| Bellefontaine | 20.2 | 202 | very hard |
| Lassy | 20.2 | 202 | very hard |
| Le Plessis-Luzarches | 20.2 | 202 | very hard |
| Attainville | 19.7 | 197 | very hard |
| Baillet-en-France | 19.7 | 197 | very hard |
| Bouffémont | 19.7 | 197 | very hard |
| Maffliers | 19.7 | 197 | very hard |
| Moisselles | 19.7 | 197 | very hard |
| Montsoult | 19.7 | 197 | very hard |
| Nerville-la-Forêt | 19.7 | 197 | very hard |
| Saint-Martin-du-Tertre | 19.7 | 197 | very hard |
| Domont | 19.5 | 195 | very hard |
| Éragny | 19.5 | 195 | very hard |
| Groslay | 19.5 | 195 | very hard |
| Montmorency | 19.5 | 195 | very hard |
| Neuville-sur-Oise | 19.5 | 195 | very hard |
| Piscop | 19.5 | 195 | very hard |
| Saint-Brice-sous-Forêt | 19.5 | 195 | very hard |
| Saint-Ouen-l'Aumône | 19.5 | 195 | very hard |
| Sarcelles | 19.5 | 195 | very hard |
| Villiers-le-Bel | 19.5 | 195 | very hard |
| Louvres | 19.1 | 191 | very hard |