Tap water quality in Guichen
According to the latest sample of the regional health agency's inspection.
- Distributor
- SAUR 35
- Commune
- Guichen
- Data updated
- October 2026
TasteOKGood
Unfiltered tap water
Filtered with EcoPro
ChlorineHigh quality0.4 mg CL2/lHigh quality0.008 mg CL2/l
Unfiltered tap water
Filtered with EcoPro
LimescaleMediumLowLimescale inhibitor
Unfiltered tap water
Filtered with EcoPro
The EcoPro filter contains a limescale inhibitor that stops the water's calcium and magnesium from forming deposits in kettles, coffee machines, taps and pipes. It doesn't remove those minerals, but limescale no longer forms. The hardness measured in your area is in the full parameter list.
MineralsHigh quality259.2 mg/lHigh quality259.2 mg/lMinerals kept
Unfiltered tap water
Filtered with EcoPro
TAPP Water EcoPro filters do not remove healthy minerals such as calcium and magnesium, so the mineral content (total dissolved solids, TDS) is the same before and after filtering.
PathogensDrinkable0High quality
Unfiltered tap water
Filtered with EcoPro
Heavy metalsDrinkableHigh quality
Unfiltered tap water
Filtered with EcoPro
MicroplasticsNot reportedNot reported
Unfiltered tap water
Filtered with EcoPro
Microplastics have been found in most tap water, although the amount varies. The health inspection does not measure microplastics.
PFASWithin limit0.007 ug/LHigh quality0.001 ug/L
Unfiltered tap water
Filtered with EcoPro
PFAS are regulated by EU Directive 2020/2184, transposed into French law: 0.10 µg/l for the sum of 20 substances, applicable since January 2026. Where no value appears, the health inspection has not yet measured PFAS in this distribution unit.
The "Filtered" column shows the estimated result after filtering with TAPP Water EcoPro filters.
Improve your tap water
TAPP Water filters reduce chlorine, heavy metals and microplastics in tap water, without plastic bottles.
Choose your distribution unit
Your commune is served by several distribution units and water quality can differ between them. Pick the one covering your neighbourhood.
- Bourg-des-Comptes, Bruz, Chanteloup, Crevin, Guichen (sauf la gare et Pont-Réan), Guipry-Messac, Le Petit-Fougeray, Pancé, Poligné, Saint-Malo-de-Phily31,165 peopleBRUYERES_FRAUX/PORT DE ROCHE/CHAMP FLEURY_GUICHENYou're viewing this one
- Betton (Est), Bruz (KER LANN), Cesson-Sévigné (SUD), Chantepie (-), Chartres-de-Bretagne (Nord), Goven, Le Rheu (LANDES D'APIGNE), Mézières-sur-Couesnon, Noyal-Châtillon-sur-Seiche (Nord-Ouest), Plouasne, Rennes (-), Saint-Jacques-de-la-Lande (-), Sixt-sur-Aff, Thorigné-Fouillard (-), Vern-sur-Seiche (-), Vezin-le-Coquet (EST)138,722 peopleCEBR_VILLEJEAN/ROPHEMEL/MEZIERES/AVA_RENNES
- Bédée (-), Breteil (-), Clayes (-), Goven, Irodouër (-), La Nouaye (-), Le Rheu (sauf INRA LES LANDES D'APIGNE ET ZONE SUD OUEST), Pacé (-), Parthenay-de-Bretagne (-), Pleumeleuc (-), Plouasne, Rennes, Romillé (-), Saint-Gilles (-), Saint-Pern (-), Sixt-sur-Aff, Vezin-le-Coquet (SAUF EST)105,704 peopleCEBR_ROPHEMEL_PACE
- Bréal-sous-Montfort (-), Chavagne (-), Cintré (-), Goven (-), La Chapelle-Thouarault (-), Le Rheu (Sud-Ouest), Mordelles (-), Pipriac, Plouasne, Rennes, Talensac (-)89,491 peopleCEBR_LILLION/ROPHEMEL/FRAUX_MORDELLES
- Bourgbarré (-), Bruz ((sauf ker lann)), Chartres-de-Bretagne (Centre et Sud), Guichen (pont réan), Laillé (-), Noyal-Châtillon-sur-Seiche (Sauf Nord-Ouest), Orgères (-), Pont-Péan (-), Saint-Armel (-), Saint-Erblon (-)45,976 peopleCEBR_CHAMP FLEURY_BRUZ
- Baulon ((sauf zone Est)), Loutehel (-), Maxent (-), Paimpont ((Sud)), Plélan-le-Grand (-), Saint-Thurial (-), Val d'Anast (CAMPEL / toute la commune)10,542 peopleCEBR SAUR_TERTRE_PLELAN LE GRAND
- Guignen ((sauf Sud Est),), Langon, Lohéac (-), Pipriac6,316 peopleBRUYERES_FRAUX/PORT DE ROCHE_LOHEAC
- Pléchâtel ((sauf zone Sud)), Saint-Senoux ((sauf ouest))4,696 peopleBRUYERES_BOURHAN_PLECHATEL
- Baulon (-), Lassy (-), Pipriac3,911 peopleBRUYERES_CHAPINAIS/FRAUX_LASSY
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About this data
Data from the French health inspection of drinking water (Ministry of Health, regional health agencies), per distribution unit. Quality ranges are based on WHO guidelines, EU Directive 2020/2184 and the French public health code.