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GRENOBLE ALPES METROPOLE
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.05 ● (Near the limit) 0.2 – 1 0.001 ▲ Total Chlorinemg CL2/l 0.05 No limit 0.01
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 26.7 No limit 26.7 Hardnessmg CaCO3/l 173.9 80 – 459 173.9 Hardness fF 17.4 No limit 17.4 pH 7.5 6.5 – 9.5 7.5 TurbidityNTU 0.1 ≤ 4 0.01 ColorColor Units 5 ≤ 15 5 ConductivityμS / cm 368 ≤ 2,500 368 TDSmg/l 235.5estimated 0 – 1,199 235.5 Alkalinitymg CaCO3/l 149 No limit 149
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 10Sampled Jul 2026 ≤ 50 0.5 Fluoridemg F/l 0.09Sampled Jul 2026 ≤ 1.5 0.027 Mercuryμg Hg/l 0.01Sampled Jul 2026 ≤ 1 0.001 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 2.3 ≤ 50 0.69
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 7.9Sampled Jul 2026 No limit 7.9 Calciummg/l 60.6Sampled Jul 2026 No limit 60.6 Potassiummg/l 0.9Sampled Jul 2026 No limit 0.9 Chloridemg/l 2.8 ≤ 250 2.8
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 10Sampled Jul 2026 ≤ 200 10 Antimonyμg/l 1Sampled Jul 2026 ≤ 5 1 Arsenicμg/l 2Sampled Jul 2026 ≤ 10 1 Bariumμg/l 43Sampled Jul 2026 ≤ 1,000 43 Cadmiumμg/l 1Sampled Jul 2026 ≤ 5 1 Chromiumμg/l 5Sampled Jul 2026 ≤ 50 5 Copperμg/l 10Sampled Jun 2026 ≤ 2,000 0.5 Ironμg/l 10Sampled Jul 2026 ≤ 200 10 Manganeseμg/l 10Sampled Jul 2026 ≤ 50 10 Leadμg/l 2Sampled Jun 2026 ≤ 10 0.1 Nickelμg/l 5Sampled Jun 2026 ≤ 20 5 Seleniumμg/l 2Sampled Jul 2026 ≤ 10 2 Sodiummg/l 4.8Sampled Jul 2026 ≤ 200 4.8
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Jul 2026 No limit 0.005
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled Jul 2026 ≤ 0.4 0.005 Total pesticidesug/L 0.5 ● (Near the limit) Sampled Jul 2026 ≤ 0.5 0.5 ●
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Jul 2026 ≤ 70 0.02 Atrazineug/L 0.005Sampled Jul 2026 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Jul 2026 No limit 0.001 PFOSug/L 0.001Sampled Jul 2026 No limit 0.001 PFNAug/L 0.001Sampled Jul 2026 No limit 0.001 Total PFASug/L 0.029Sampled Jul 2026 ≤ 0.1 0.003 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 Perchlorateug/L 0.23Sampled Jul 2026 No limit 0.23 Sulfatemg/l 37.5 No limit 37.5 Uraniumug/L 10Sampled Jul 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.
