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STGS
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.32 0.2 – 1 0.006 ▲ Total Chlorinemg CL2/l 0.32 No limit 0.064
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 15.5 No limit 15.5 Hardnessmg CaCO3/l 273Sampled Jul 2026 80 – 459 273 Hardness fF 27.3Sampled Jul 2026 No limit 27.3 pH 7.5 6.5 – 9.5 7.5 TurbidityNTU 0.3 ≤ 4 0.03 ConductivityμS / cm 582 ≤ 2,500 582 TDSmg/l 372.5estimated 0 – 1,199 372.5 Alkalinitymg CaCO3/l 252Sampled Jul 2026 No limit 252
Pathogens Pathogens Parameter Unfiltered tap water Allowed range Filtered eColiUFC/100ml 0Sampled Jul 2026 ≤ 0 0 BacteriasNMP/100ml 0Sampled Jul 2026 ≤ 0 0 EnterococcusUFC/100ml 0Sampled Jul 2026 ≤ 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 0.1Sampled Jan 2025 ≤ 1.5 0.03 Mercuryμg Hg/l 0.05Sampled Jan 2025 ≤ 1 0.005 Nitritesmg NO2/l 0.01Sampled Jul 2026 ≤ 0.5 0.004 Nitratesmg NO3/l 26.7Sampled Jul 2026 ≤ 50 8.01
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 7.7Sampled Jan 2025 No limit 7.7 Calciummg/l 114.3Sampled Jan 2025 No limit 114.3 Potassiummg/l 1.9Sampled Jan 2025 No limit 1.9 Chloridemg/l 23.3Sampled Jul 2026 ≤ 250 23.3
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 2.9Sampled Jan 2025 ≤ 200 2.9 Antimonyμg/l 0.5Sampled Sept 2025 ≤ 5 0.5 Arsenicμg/l 0.5Sampled Jan 2025 ≤ 10 0.25 Bariumμg/l 27Sampled Jan 2025 ≤ 1,000 27 Cadmiumμg/l 0.1Sampled Sept 2025 ≤ 5 0.1 Chromiumμg/l 0.5Sampled Sept 2025 ≤ 50 0.5 Ironμg/l 5Sampled Sept 2025 ≤ 200 5 Manganeseμg/l 0.5Sampled Jan 2025 ≤ 50 0.5 Leadμg/l Not reported ≤ 10 — Seleniumμg/l 2Sampled Jan 2025 ≤ 10 2 Sodiummg/l 9.2Sampled Jan 2025 ≤ 200 9.2
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.05Sampled Jan 2025 No limit 0.003 Total Trihalomethanesμg/l 10Sampled Jun 2026 ≤ 100 0.5
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled Jan 2025 ≤ 0.4 0.005 Total pesticidesug/L 0.18Sampled Jan 2025 ≤ 0.5 0.18
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Nov 2025 ≤ 70 0.02 Atrazineug/L 0.01Sampled Nov 2025 ≤ 3 0.01
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.002Sampled Jan 2025 No limit 0.002 PFOSug/L 0.001Sampled Jan 2025 No limit 0.001 PFNAug/L 0.001Sampled Jan 2025 No limit 0.001 Total PFASug/L 0Sampled 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 0.01Sampled Jul 2026 No limit 0.003 Sulfatemg/l 6.48Sampled Jul 2026 No limit 6.48
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.
