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CYO'
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.31 0.2 – 1 0.006 ▲ Total Chlorinemg CL2/l 0.35 No limit 0.07
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 16.8 No limit 16.8 Hardnessmg CaCO3/l 368 80 – 459 368 Hardness fF 36.8 No limit 36.8 pH 7.2 6.5 – 9.5 7.2 TurbidityNTU 0.1 ≤ 4 0.01 ConductivityμS / cm 772 ≤ 2,500 772 TDSmg/l 494.1estimated 0 – 1,199 494.1 Alkalinitymg CaCO3/l 287.5 No limit 287.5 Bicarbonatemg HCO3/l 304Sampled Oct 2025 No limit 304
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 10Sampled Mar 2026 ≤ 50 0.5 Fluoridemg F/l 0.22Sampled Mar 2026 ≤ 1.5 0.066 Mercuryμg Hg/l 0.5Sampled Mar 2026 ≤ 1 0.05 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 27 ≤ 50 8.1
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 11 No limit 11 Calciummg/l 101.3Sampled Mar 2026 No limit 101.3 Potassiummg/l 1.7Sampled Mar 2026 No limit 1.7 Chloridemg/l 47.8 ≤ 250 47.8
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 10 ≤ 200 10 Antimonyμg/l 1Sampled Mar 2026 ≤ 5 1 Arsenicμg/l 2Sampled Mar 2026 ≤ 10 1 Bariumμg/l 57Sampled Mar 2026 ≤ 1,000 57 Cadmiumμg/l 1Sampled Mar 2026 ≤ 5 1 Chromiumμg/l 5Sampled Mar 2026 ≤ 50 5 Ironμg/l 10 ≤ 200 10 Manganeseμg/l 10 ≤ 50 10 Leadμg/l Not reported ≤ 10 — Seleniumμg/l 2Sampled Mar 2026 ≤ 10 2 Sodiummg/l 10Sampled Mar 2026 ≤ 200 10
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Mar 2026 No limit 0.005 Total Trihalomethanesμg/l 4.6 ≤ 100 0.23
Haloacetic acids Haloacetic acids Parameter Unfiltered tap water Allowed range Filtered Total haloacetic acidsμg/l 0.7Sampled Mar 2026 ≤ 60 0.035
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Total pesticidesug/L 0.074Sampled Mar 2026 ≤ 0.5 0.074
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Mar 2026 ≤ 70 0.02 Atrazineug/L 0.005Sampled Mar 2026 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Mar 2026 No limit 0.001 PFOSug/L 0.001Sampled Mar 2026 No limit 0.001 PFNAug/L 0.001Sampled Mar 2026 No limit 0.001 Total PFASug/L 0.029Sampled Mar 2026 ≤ 0.1 0.003 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 Perchlorateug/L 1.68Sampled Mar 2026 No limit 1.68 Sulfatemg/l 26.9 No limit 26.9 Uraniumug/L 10Sampled Mar 2026 No limit 10
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.
