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CEO - AGENCE DE CERGY
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.19 ● (Near the limit) 0.2 – 1 0.004 ▲ Total Chlorinemg CL2/l 0.21 No limit 0.042
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 11.8 No limit 11.8 Hardnessmg CaCO3/l 262.2 80 – 459 262.2 Hardness fF 26.2 No limit 26.2 pH 7.3 6.5 – 9.5 7.3 TurbidityNTU 0.1 ≤ 4 0.01 ConductivityμS / cm 603 ≤ 2,500 603 TDSmg/l 385.9estimated 0 – 1,199 385.9 Alkalinitymg CaCO3/l 233 No limit 233 Bicarbonatemg HCO3/l 266Sampled Nov 2025 No limit 266
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 Nov 2025 ≤ 50 0.5 Fluoridemg F/l 0.35Sampled Nov 2025 ≤ 1.5 0.11 Mercuryμg Hg/l 0.01Sampled Nov 2025 ≤ 1 0.001 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 14.5 ≤ 50 4.35
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 14.2 No limit 14.2 Calciummg/l 72.3Sampled Nov 2025 No limit 72.3 Potassiummg/l 7.7Sampled Nov 2025 No limit 7.7 Chloridemg/l 18.8 ≤ 250 18.8
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 10 ≤ 200 10 Arsenicμg/l 2Sampled Nov 2025 ≤ 10 1 Bariumμg/l 48Sampled Nov 2025 ≤ 1,000 48 Ironμg/l 10 ≤ 200 10 Manganeseμg/l 10 ≤ 50 10 Leadμg/l Not reported ≤ 10 — Seleniumμg/l 2Sampled Nov 2025 ≤ 10 2 Sodiummg/l 25.8Sampled Nov 2025 ≤ 200 25.8
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Nov 2025 No limit 0.005 Total Trihalomethanesμg/l 6.2 ≤ 100 0.31
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Total pesticidesug/L 0.5 ● (Near the limit) Sampled Nov 2025 ≤ 0.5 0.5 ●
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Nov 2025 ≤ 70 0.02 Atrazineug/L 0.005Sampled Nov 2025 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Nov 2025 No limit 0.001 PFOSug/L 0.001Sampled Nov 2025 No limit 0.001 PFNAug/L 0.001Sampled Nov 2025 No limit 0.001 Total PFASug/L 0.029Sampled Nov 2025 ≤ 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 0.46Sampled Oct 2025 No limit 0.46 Sulfatemg/l 53 No limit 53
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.
