Water hardness by postcode in France

Enter your postcode: we match it to the nearest city with published hardness data and show its value, unit and source.

How the search works

Every postcode is matched to the nearest of the 33641 cities in France for which a water supplier or regulator publishes hardness. Supply areas do not follow postcode boundaries, so the result is the figure of the nearest published supply. If the match is more than 15 km away we say so, and the annual water quality report of your own supplier is the better reference. Each city page names the source document and its date and, where the supplier publishes them, the values of each supply zone.

Regions

Largest cities in France

	°fH	mg/L
Paris	26.1	261	very hard
Marseille	22	220	very hard
Lyon	19.3	193	very hard
Toulouse	11.5	115	moderately hard
Nice	21.2	212	very hard
Nantes	14.4	144	hard
Montpellier	32.9	329	very hard
Strasbourg	24	240	very hard
Bordeaux	22.2	222	very hard
Lille	37.6	376	very hard
Rennes	16.2	162	hard
Reims	30.5	305	very hard
Saint-Étienne	1.4	14	soft
Le Havre	24.2	242	very hard
Toulon	33.1	331	very hard
Dijon	28.7	287	very hard
Nîmes	23.5	235	very hard
Angers	17.4	174	hard
Villeurbanne	19.3	193	very hard
Aix-en-Provence	17.4	174	hard
Le Mans	29.1	291	very hard
Clermont-Ferrand	7.6	76	moderately hard
Brest	11	110	moderately hard
Tours	12.3	123	hard
Amiens	28.1	281	very hard
Annecy	14.7	147	hard
Perpignan	23.4	234	very hard
Boulogne-Billancourt	24.1	241	very hard
Metz	24.9	249	very hard
Besançon	26	260	very hard
Orléans	16.5	165	hard
Saint-Denis	28	280	very hard
Rouen	27.7	277	very hard
Mulhouse	10.4	104	moderately hard
Montreuil	26.5	265	very hard
Caen	34.5	345	very hard
Nancy	13.9	139	hard
Tourcoing	44.7	447	very hard
Roubaix	44.7	447	very hard
Nanterre	17.5	175	hard

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