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SYNDICAT DES EAUX DE RENNES-CHAY
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l Not reported 0.2 – 1 —
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 15.6 No limit 15.6 Hardnessmg CaCO3/l 242 80 – 459 242 Hardness fF 24.2 No limit 24.2 pH 7.5 6.5 – 9.5 7.5 TurbidityNTU 0.2 ≤ 4 0.02 ConductivityμS / cm 429 ≤ 2,500 429 TDSmg/l 274.6estimated 0 – 1,199 274.6 Alkalinitymg CaCO3/l 208 No limit 208 Bicarbonatemg HCO3/l 251Sampled Sept 2025 No limit 251
Pathogens Pathogens Parameter Unfiltered tap water Allowed range Filtered eColiUFC/100ml 0 ≤ 0 0 BacteriasNMP/100ml 0 ≤ 0 0 EnterococcusUFC/100ml 0 ≤ 0 0
Chemical parameters Chemical parameters Parameter Unfiltered tap water Allowed range Filtered Cyanide totalμg CN/l 10Sampled Sept 2025 ≤ 50 0.5 Fluoridemg F/l 0.08Sampled Sept 2025 ≤ 1.5 0.024 Mercuryμg Hg/l 0.015Sampled Sept 2025 ≤ 1 0.002 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 1.2 ≤ 50 0.36
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 3.49Sampled Sept 2025 No limit 3.49 Calciummg/l 83.9Sampled Sept 2025 No limit 83.9 Potassiummg/l 1.49Sampled Sept 2025 No limit 1.49 Chloridemg/l 8.2 ≤ 250 8.2
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 10Sampled Sept 2025 ≤ 200 10 Arsenicμg/l 1Sampled Sept 2025 ≤ 10 0.5 Bariumμg/l 10Sampled Sept 2025 ≤ 1,000 10 Ironμg/l 10Sampled Sept 2025 ≤ 200 10 Manganeseμg/l 2Sampled Sept 2025 ≤ 50 2 Leadμg/l Not reported ≤ 10 — Seleniumμg/l 1Sampled Sept 2025 ≤ 10 1 Sodiummg/l 5.53Sampled Sept 2025 ≤ 200 5.53
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Sept 2025 No limit 0.005
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled Sept 2025 ≤ 0.4 0.005 Total pesticidesug/L 0.5 ● (Near the limit) Sampled Sept 2025 ≤ 0.5 0.5 ●
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Sept 2025 ≤ 70 0.02 Atrazineug/L 0.005Sampled Sept 2025 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Sept 2025 No limit 0.001 PFOSug/L 0.001Sampled Sept 2025 No limit 0.001 PFNAug/L 0.001Sampled Sept 2025 No limit 0.001 Total PFASug/L 0.007Sampled Sept 2025 ≤ 0.1 0.001 PFAS 4ng/l Not reported No limit — PFAS 21ng/l Not reported No limit —
Other Other Parameter Unfiltered tap water Allowed range Filtered Ammoniamg/l 0.01 No limit 0.003 Sulfatemg/l 4.9 No limit 4.9
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.
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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.
