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RÉGIE DES EAUX DES COËVRONS
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.11 ● (Near the limit) 0.2 – 1 0.002 ▲ Total Chlorinemg CL2/l 0.19 No limit 0.038
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 25.4 No limit 25.4 Hardnessmg CaCO3/l 130 80 – 459 130 Hardness fF 13 No limit 13 pH 8.1 6.5 – 9.5 8.1 TurbidityNTU 0.3 ≤ 4 0.03 ColorColor Units 5 ≤ 15 5 ConductivityμS / cm 463 ≤ 2,500 463 TDSmg/l 296.3estimated 0 – 1,199 296.3 Alkalinitymg CaCO3/l 90 No limit 90 Bicarbonatemg HCO3/l 101Sampled Jul 2026 No limit 101
Pathogens Pathogens Parameter Unfiltered tap water Allowed range Filtered ClostridiumUFC/100ml 0 ≤ 0 0 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 5Sampled Jan 2026 ≤ 50 0.25 Fluoridemg F/l 0.05Sampled Jan 2026 ≤ 1.5 0.015 Mercuryμg Hg/l 0.01Sampled Jan 2026 ≤ 1 0.001 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 16 ≤ 50 4.8
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 3.5Sampled Jul 2026 No limit 3.5 Calciummg/l 32.2Sampled Jul 2026 No limit 32.2 Potassiummg/l 2.6Sampled Jul 2026 No limit 2.6 Chloridemg/l 53.1 ≤ 250 53.1
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 23Sampled Jan 2026 ≤ 200 23 Antimonyμg/l 0.1Sampled Jan 2026 ≤ 5 0.1 Arsenicμg/l 1.6Sampled Jan 2026 ≤ 10 0.8 Bariumμg/l 35Sampled Jan 2026 ≤ 1,000 35 Cadmiumμg/l 0.058Sampled Jan 2026 ≤ 5 0.058 Chromiumμg/l 0.4Sampled Jan 2026 ≤ 50 0.4 Copperμg/l 14.7 ≤ 2,000 0.74 Ironμg/l 18 ≤ 200 18 Manganeseμg/l 3 ≤ 50 3 Leadμg/l 0.5 ≤ 10 0.025 Nickelμg/l 1.5 ≤ 20 1.5 Seleniumμg/l 0.2Sampled Jan 2026 ≤ 10 0.2 Sodiummg/l 15.6Sampled Jul 2026 ≤ 200 15.6
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Jan 2026 No limit 0.005 Total Trihalomethanesμg/l 4.2Sampled Jan 2025 ≤ 100 0.21
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Chlordaneug/L 0Sampled Jan 2026 ≤ 2 0 Heptachlorug/L 0.001Sampled Jan 2026 ≤ 0.4 0.001 Total pesticidesug/L 0.031Sampled Jan 2026 ≤ 0.5 0.031
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Jan 2026 ≤ 70 0.02 Atrazineug/L 0.01Sampled Jan 2026 ≤ 3 0.01
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Jan 2026 No limit 0.001 PFOSug/L 0.002Sampled Jan 2026 No limit 0.002 PFNAug/L 0.001Sampled Jan 2026 No limit 0.001 Total PFASug/L 0.002Sampled Jan 2026 ≤ 0.1 0 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 0.017 No limit 0.005 Sulfatemg/l 41.1 No limit 41.1 Uraniumug/L 0.06Sampled Jan 2026 No limit 0.06
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.
