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GRENOBLE ALPES METROPOLE
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.19 ● (Near the limit) 0.2 – 1 0.004 ▲ Total Chlorinemg CL2/l 0.21 No limit 0.042
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 13.1 No limit 13.1 Hardnessmg CaCO3/l 169.6 80 – 459 169.6 Hardness fF 17 No limit 17 pH 7.9 6.5 – 9.5 7.9 TurbidityNTU 0.52 ≤ 4 0.052 ColorColor Units 5 ≤ 15 5 ConductivityμS / cm 344 ≤ 2,500 344 TDSmg/l 220.2estimated 0 – 1,199 220.2 Alkalinitymg CaCO3/l 161.5 No limit 161.5
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 Oct 2025 ≤ 50 0.5 Fluoridemg F/l 0.16Sampled Oct 2025 ≤ 1.5 0.048 Mercuryμg Hg/l 0.01Sampled Oct 2025 ≤ 1 0.001 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 1.86 ≤ 50 0.56
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 7.2Sampled Oct 2025 No limit 7.2 Calciummg/l 69.1Sampled Oct 2025 No limit 69.1 Potassiummg/l 0.5Sampled Oct 2025 No limit 0.5 Chloridemg/l 1.5 ≤ 250 1.5
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 27Sampled Oct 2025 ≤ 200 27 Antimonyμg/l 1Sampled Jul 2025 ≤ 5 1 Arsenicμg/l 2Sampled Oct 2025 ≤ 10 1 Bariumμg/l 10Sampled Oct 2025 ≤ 1,000 10 Cadmiumμg/l 1Sampled Jul 2025 ≤ 5 1 Chromiumμg/l 5Sampled Jul 2025 ≤ 50 5 Copperμg/l 26Sampled Jul 2025 ≤ 2,000 1.3 Ironμg/l 14Sampled Oct 2025 ≤ 200 14 Manganeseμg/l 10Sampled Oct 2025 ≤ 50 10 Leadμg/l 2Sampled Jul 2025 ≤ 10 0.1 Nickelμg/l 5Sampled Jul 2025 ≤ 20 5 Seleniumμg/l 2Sampled Oct 2025 ≤ 10 2 Sodiummg/l 3.9Sampled Oct 2025 ≤ 200 3.9
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Oct 2025 No limit 0.005 Total Trihalomethanesμg/l 27.5Sampled Oct 2025 ≤ 100 1.38
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled Oct 2025 ≤ 0.4 0.005 Total pesticidesug/L 0.5 ● (Near the limit) Sampled Oct 2025 ≤ 0.5 0.5 ●
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Oct 2025 ≤ 70 0.02 Atrazineug/L 0.005Sampled Oct 2025 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Oct 2025 No limit 0.001 PFOSug/L 0.001Sampled Oct 2025 No limit 0.001 PFNAug/L 0.001Sampled Oct 2025 No limit 0.001 Total PFASug/L 0.029Sampled Oct 2025 ≤ 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 Sulfatemg/l 11.1 No limit 11.1
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.
