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SAINT-ETIENNE MÉTROPOLE
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.04 ● (Near the limit) 0.2 – 1 0.001 ▲ Total Chlorinemg CL2/l 0.06 No limit 0.012
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 25.1 No limit 25.1 Hardnessmg CaCO3/l 19 ● (Near the limit) 80 – 459 19 ● Hardness fF 1.9 No limit 1.9 pH 6.5 6.5 – 9.5 6.5 TurbidityNTU 0.32 ≤ 4 0.032 ColorColor Units 5 ≤ 15 5 ConductivityμS / cm 80 ≤ 2,500 80 TDSmg/l 51.2estimated 0 – 1,199 51.2 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 6 ≤ 0 0.6 EnterococcusUFC/100ml 0 ≤ 0 0
Chemical parameters Chemical parameters Parameter Unfiltered tap water Allowed range Filtered Mercuryμg Hg/l Not reported ≤ 1 — Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 13.3 ≤ 50 3.99
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 1.7 No limit 1.7 Calciummg/l 4.8 No limit 4.8 Chloridemg/l 3.6 ≤ 250 3.6
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Antimonyμg/l 1Sampled Nov 2025 ≤ 5 1 Arsenicμg/l Not reported ≤ 10 — Cadmiumμg/l 1Sampled Nov 2025 ≤ 5 1 Chromiumμg/l 5Sampled Nov 2025 ≤ 50 5 Ironμg/l 78Sampled Nov 2025 ≤ 200 78 Leadμg/l Not reported ≤ 10 —
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Total Trihalomethanesμg/l 0.51Sampled Nov 2025 ≤ 100 0.026
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered Total PFASug/L Not reported ≤ 0.1 — 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 4.5 No limit 4.5
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.
Your Water Quality
Independent information about tap water quality in France.
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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.
