← Back to summary See all parameters SEM ONDAINE QUATRE VENTS · Fraisses
SAINT-ETIENNE MÉTROPOLE
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.42 0.2 – 1 0.008 ▲ Total Chlorinemg CL2/l 0.52 No limit 0.1
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 15.5 No limit 15.5 Hardnessmg CaCO3/l 89.1Sampled May 2026 80 – 459 89.1 Hardness fF 8.91Sampled May 2026 No limit 8.91 pH 7.3 6.5 – 9.5 7.3 TurbidityNTU 0.18Sampled May 2026 ≤ 4 0.018 ColorColor Units 5Sampled May 2026 ≤ 15 5 ConductivityμS / cm 215Sampled May 2026 ≤ 2,500 215 TDSmg/l 137.6Sampled May 2026 estimated 0 – 1,199 137.6 Alkalinitymg CaCO3/l 73.5Sampled May 2026 No limit 73.5
Pathogens Pathogens Parameter Unfiltered tap water Allowed range Filtered ClostridiumUFC/100ml 0Sampled May 2026 ≤ 0 0 eColiUFC/100ml 0Sampled May 2026 ≤ 0 0 BacteriasNMP/100ml 0Sampled May 2026 ≤ 0 0 EnterococcusUFC/100ml 0Sampled May 2026 ≤ 0 0
Chemical parameters Chemical parameters Parameter Unfiltered tap water Allowed range Filtered Cyanide totalμg CN/l 10Sampled Sept 2025 ≤ 50 0.5 Fluoridemg F/l 0.05Sampled Sept 2025 ≤ 1.5 0.015 Mercuryμg Hg/l 0.01Sampled Sept 2025 ≤ 1 0.001 Nitritesmg NO2/l 0.01Sampled May 2026 ≤ 0.5 0.004 Nitratesmg NO3/l 3.2Sampled May 2026 ≤ 50 0.96
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 1.6Sampled May 2026 No limit 1.6 Calciummg/l 32.4Sampled May 2026 No limit 32.4 Potassiummg/l 1.3Sampled May 2026 No limit 1.3 Chloridemg/l 7.4Sampled May 2026 ≤ 250 7.4
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 10Sampled May 2026 ≤ 200 10 Arsenicμg/l 2Sampled Sept 2025 ≤ 10 1 Bariumμg/l 16Sampled Sept 2025 ≤ 1,000 16 Ironμg/l 10Sampled Sept 2025 ≤ 200 10 Manganeseμg/l 10Sampled Nov 2025 ≤ 50 10 Leadμg/l Not reported ≤ 10 — Seleniumμg/l 2Sampled Sept 2025 ≤ 10 2 Sodiummg/l 5.6Sampled May 2026 ≤ 200 5.6
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Sept 2025 No limit 0.005 Total Trihalomethanesμg/l 26.7Sampled May 2026 ≤ 100 1.34
Haloacetic acids Haloacetic acids Parameter Unfiltered tap water Allowed range Filtered Total haloacetic acidsμg/l 5.3Sampled May 2026 ≤ 60 0.27
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled May 2026 ≤ 0.4 0.005 Total pesticidesug/L 0.5 ● (Near the limit) Sampled May 2026 ≤ 0.5 0.5 ●
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled May 2026 ≤ 70 0.02 Atrazineug/L 0.005Sampled May 2026 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Sept 2025 No limit 0.001 PFOSug/L 0.001Sampled Sept 2025 No limit 0.001 PFNAug/L 0.001Sampled Sept 2025 No limit 0.001 Total PFASug/L 0.001Sampled Sept 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 0.01Sampled May 2026 No limit 0.003 Sulfatemg/l 23.5Sampled May 2026 No limit 23.5
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.
Brought to you by
tappwater.co
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.
