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MAIRIE DE MARS
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.06 ● (Near the limit) 0.2 – 1 0.001 ▲ Total Chlorinemg CL2/l 0.08 No limit 0.016
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 25.5 No limit 25.5 Hardnessmg CaCO3/l 153.9 80 – 459 153.9 Hardness fF 15.4 No limit 15.4 pH 8 6.5 – 9.5 8 TurbidityNTU 0.12 ≤ 4 0.012 ColorColor Units 5 ≤ 15 5 ConductivityμS / cm 303 ≤ 2,500 303 TDSmg/l 193.9estimated 0 – 1,199 193.9 Alkalinitymg CaCO3/l 160.5 No limit 160.5 Bicarbonatemg HCO3/l 174Sampled Mar 2026 No limit 174
Pathogens Pathogens Parameter Unfiltered tap water Allowed range Filtered ClostridiumUFC/100ml 0Sampled Dec 2025 ≤ 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 Mar 2026 ≤ 50 0.5 Fluoridemg F/l 0.05Sampled Mar 2026 ≤ 1.5 0.015 Mercuryμg Hg/l 0.5Sampled Mar 2026 ≤ 1 0.05 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 1.2 ≤ 50 0.36
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 19.1 No limit 19.1 Calciummg/l 30.1 No limit 30.1 Potassiummg/l 0.5Sampled Mar 2026 No limit 0.5 Chloridemg/l 4.6 ≤ 250 4.6
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 10Sampled Mar 2026 ≤ 200 10 Antimonyμg/l 1Sampled Mar 2026 ≤ 5 1 Arsenicμg/l 2.3Sampled Mar 2026 ≤ 10 1.15 Bariumμg/l 11Sampled Mar 2026 ≤ 1,000 11 Cadmiumμg/l 1Sampled Mar 2026 ≤ 5 1 Chromiumμg/l 5Sampled Mar 2026 ≤ 50 5 Copperμg/l 17Sampled Mar 2025 ≤ 2,000 0.85 Ironμg/l 10Sampled Mar 2026 ≤ 200 10 Manganeseμg/l 10Sampled Mar 2026 ≤ 50 10 Leadμg/l 2Sampled Mar 2025 ≤ 10 0.1 Nickelμg/l 5Sampled Mar 2025 ≤ 20 5 Seleniumμg/l 2Sampled Mar 2026 ≤ 10 2 Sodiummg/l 4.2Sampled Mar 2026 ≤ 200 4.2
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Mar 2026 No limit 0.005
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled Mar 2026 ≤ 0.4 0.005 Total pesticidesug/L 0.5 ● (Near the limit) Sampled Mar 2026 ≤ 0.5 0.5 ●
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Mar 2026 ≤ 70 0.02 Atrazineug/L 0.005Sampled Mar 2026 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Mar 2026 No limit 0.001 PFOSug/L 0.001Sampled Mar 2026 No limit 0.001 PFNAug/L 0.001Sampled Mar 2026 No limit 0.001 Total PFASug/L 0.001Sampled Mar 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 12.4 No limit 12.4 Uraniumug/L 10Sampled Mar 2026 No limit 10
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.
