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REGIE DES EAUX GESSIENNES
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.13 ● (Near the limit) 0.2 – 1 0.003 ▲ Total Chlorinemg CL2/l 0.18 No limit 0.036
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 19.3 No limit 19.3 Hardnessmg CaCO3/l 38.9 ● (Near the limit) 80 – 459 38.9 ● Hardness fF 3.89 No limit 3.89 pH 7.7 6.5 – 9.5 7.7 TurbidityNTU 0.1 ≤ 4 0.01 ColorColor Units 5 ≤ 15 5 ConductivityμS / cm 495 ≤ 2,500 495 TDSmg/l 316.8estimated 0 – 1,199 316.8 Alkalinitymg CaCO3/l 252.5 No limit 252.5
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 Jan 2025 ≤ 50 0.5 Fluoridemg F/l 0.05Sampled Jan 2025 ≤ 1.5 0.015 Mercuryμg Hg/l 0.01Sampled Jan 2025 ≤ 1 0.001 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 6.9 ≤ 50 2.07
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 0.7 No limit 0.7 Calciummg/l 14.4 No limit 14.4 Potassiummg/l 0.2Sampled Jan 2025 No limit 0.2 Chloridemg/l 1.2 ≤ 250 1.2
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 10Sampled Jan 2025 ≤ 200 10 Arsenicμg/l 2Sampled Jan 2025 ≤ 10 1 Bariumμg/l 11Sampled Jan 2025 ≤ 1,000 11 Ironμg/l 10Sampled Jan 2025 ≤ 200 10 Manganeseμg/l 10Sampled Jan 2025 ≤ 50 10 Leadμg/l Not reported ≤ 10 — Seleniumμg/l 2Sampled Jan 2025 ≤ 10 2 Sodiummg/l 0.8Sampled Jan 2025 ≤ 200 0.8
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Jan 2025 No limit 0.005
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled Jan 2025 ≤ 0.4 0.005 Total pesticidesug/L 0.5 ● (Near the limit) Sampled Jan 2025 ≤ 0.5 0.5 ●
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Jan 2025 ≤ 70 0.02 Atrazineug/L 0.005Sampled Jan 2025 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered Total PFASug/L 0.001Sampled Jan 2025 ≤ 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 0.01 No limit 0.003 Sulfatemg/l 3.6 No limit 3.6
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.
