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STGS
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.36 0.2 – 1 0.007 ▲ Total Chlorinemg CL2/l 0.46 No limit 0.092
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 24 No limit 24 Hardnessmg CaCO3/l 137 80 – 459 137 Hardness fF 13.7 No limit 13.7 pH 8.2 6.5 – 9.5 8.2 TurbidityNTU 0.3 ≤ 4 0.03 ColorColor Units 5 ≤ 15 5 ConductivityμS / cm 393 ≤ 2,500 393 TDSmg/l 251.5estimated 0 – 1,199 251.5 Alkalinitymg CaCO3/l 104 No limit 104 Bicarbonatemg HCO3/l 74Sampled Apr 2026 No limit 74
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 5Sampled Feb 2026 ≤ 50 0.25 Fluoridemg F/l 0.068Sampled Feb 2026 ≤ 1.5 0.02 Mercuryμg Hg/l 0.01Sampled Feb 2026 ≤ 1 0.001 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 9.5 ≤ 50 2.85
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 7Sampled Apr 2026 No limit 7 Calciummg/l 48.9Sampled Apr 2026 No limit 48.9 Potassiummg/l 3Sampled Apr 2026 No limit 3 Chloridemg/l 34.2 ≤ 250 34.2
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 2Sampled Feb 2026 ≤ 200 2 Antimonyμg/l 0.1Sampled Feb 2026 ≤ 5 0.1 Arsenicμg/l 0.2Sampled Feb 2026 ≤ 10 0.1 Bariumμg/l 32Sampled Feb 2026 ≤ 1,000 32 Cadmiumμg/l 0.02Sampled Feb 2026 ≤ 5 0.02 Chromiumμg/l 0.7Sampled Feb 2026 ≤ 50 0.7 Copperμg/l 7.2 ≤ 2,000 0.36 Ironμg/l 6 ≤ 200 6 Manganeseμg/l 0.5 ≤ 50 0.5 Leadμg/l 0.6 ≤ 10 0.03 Nickelμg/l 0.9 ≤ 20 0.9 Seleniumμg/l 0.2Sampled Feb 2026 ≤ 10 0.2 Sodiummg/l 20.2Sampled Apr 2026 ≤ 200 20.2
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Feb 2026 No limit 0.005 Total Trihalomethanesμg/l 18 ≤ 100 0.9
Haloacetic acids Haloacetic acids Parameter Unfiltered tap water Allowed range Filtered Total haloacetic acidsμg/l 4.5 ≤ 60 0.23
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Chlordaneug/L 0Sampled Feb 2026 ≤ 2 0 Heptachlorug/L 0.001Sampled Feb 2026 ≤ 0.4 0.001 Total pesticidesug/L 0Sampled Feb 2026 ≤ 0.5 0
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Feb 2026 ≤ 70 0.02 Atrazineug/L 0.01Sampled Feb 2026 ≤ 3 0.01
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Feb 2026 No limit 0.001 PFOSug/L 0.002Sampled Feb 2026 No limit 0.002 PFNAug/L 0.001Sampled Feb 2026 No limit 0.001 Total PFASug/L 0Sampled Feb 2026 ≤ 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 34.5 No limit 34.5 Uraniumug/L 0.05Sampled Feb 2026 No limit 0.05
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.
