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SAINT-ETIENNE MÉTROPOLE
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.45 0.2 – 1 0.009 ▲ Total Chlorinemg CL2/l 0.51 No limit 0.1
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 14.2 No limit 14.2 Hardnessmg CaCO3/l 18.5 ● (Near the limit) 80 – 459 18.5 ● Hardness fF 1.85 No limit 1.85 pH 6.9 6.5 – 9.5 6.9 TurbidityNTU 0.54 ≤ 4 0.054 ColorColor Units 5 ≤ 15 5 ConductivityμS / cm 83 ≤ 2,500 83 TDSmg/l 53.1estimated 0 – 1,199 53.1 Alkalinitymg CaCO3/l 17 No limit 17
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 Jul 2025 ≤ 50 0.5 Fluoridemg F/l 0.09Sampled Jul 2025 ≤ 1.5 0.027 Mercuryμg Hg/l 0.01Sampled Jul 2025 ≤ 1 0.001 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 12.8 ≤ 50 3.84
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 1.7 No limit 1.7 Calciummg/l 4.6 No limit 4.6 Potassiummg/l 0.9Sampled Jul 2025 No limit 0.9 Chloridemg/l 4.5 ≤ 250 4.5
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 43Sampled Jul 2025 ≤ 200 43 Arsenicμg/l 2Sampled Jul 2025 ≤ 10 1 Bariumμg/l 10Sampled Jul 2025 ≤ 1,000 10 Ironμg/l 20Sampled Jul 2025 ≤ 200 20 Manganeseμg/l 10Sampled Jul 2025 ≤ 50 10 Leadμg/l Not reported ≤ 10 — Seleniumμg/l 2Sampled Jul 2025 ≤ 10 2 Sodiummg/l 7.5Sampled Jul 2025 ≤ 200 7.5
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Jul 2025 No limit 0.005 Total Trihalomethanesμg/l 5.58Sampled Jul 2025 ≤ 100 0.28
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled Jul 2025 ≤ 0.4 0.005 Total pesticidesug/L 0.5 ● (Near the limit) Sampled Jul 2025 ≤ 0.5 0.5 ●
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Jul 2025 ≤ 70 0.02 Atrazineug/L 0.005Sampled Jul 2025 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Jul 2025 No limit 0.001 PFOSug/L 0.001Sampled Jul 2025 No limit 0.001 PFNAug/L 0.001Sampled Jul 2025 No limit 0.001 Total PFASug/L 0.028Sampled Jul 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 Sulfatemg/l 4.8 No limit 4.8
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.
