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CU GRAND BESANÇON MÉTROPOLE
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.08 ● (Near the limit) 0.2 – 1 0.002 ▲ Total Chlorinemg CL2/l 0.1 No limit 0.02
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 13.6 No limit 13.6 Hardnessmg CaCO3/l 236 80 – 459 236 Hardness fF 23.6 No limit 23.6 pH 7.7 6.5 – 9.5 7.7 TurbidityNTU 0.2 ≤ 4 0.02 ConductivityμS / cm 488 ≤ 2,500 488 TDSmg/l 312.3estimated 0 – 1,199 312.3 Alkalinitymg CaCO3/l 217 No limit 217
Pathogens Pathogens Parameter Unfiltered tap water Allowed range Filtered 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 0.06Sampled Mar 2026 ≤ 1.5 0.018 Mercuryμg Hg/l 0.015Sampled Mar 2026 ≤ 1 0.002 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 3.8 ≤ 50 1.14
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 3.07 No limit 3.07 Calciummg/l 89.7 No limit 89.7 Potassiummg/l 1.46Sampled Mar 2026 No limit 1.46 Chloridemg/l 17 ≤ 250 17
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 1Sampled Mar 2026 ≤ 10 0.5 Bariumμg/l 13.2Sampled Mar 2026 ≤ 1,000 13.2 Cadmiumμg/l 1Sampled Mar 2026 ≤ 5 1 Chromiumμg/l 2Sampled Mar 2026 ≤ 50 2 Copperμg/l 32.5Sampled Mar 2026 ≤ 2,000 1.63 Ironμg/l 10Sampled Mar 2026 ≤ 200 10 Manganeseμg/l 2Sampled Mar 2026 ≤ 50 2 Leadμg/l 2Sampled Mar 2026 ≤ 10 0.1 Nickelμg/l 2Sampled Mar 2026 ≤ 20 2 Seleniumμg/l 1Sampled Mar 2026 ≤ 10 1 Sodiummg/l 6.32Sampled Mar 2026 ≤ 200 6.32
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Mar 2026 No limit 0.005 Total Trihalomethanesμg/l 6.21Sampled Mar 2026 ≤ 100 0.31
Haloacetic acids Haloacetic acids Parameter Unfiltered tap water Allowed range Filtered Total haloacetic acidsμg/l 3Sampled Mar 2026 ≤ 60 0.15
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 0.001 No limit 0.001 PFOSug/L 0.002 No limit 0.002 PFNAug/L 0.001 No limit 0.001 Total PFASug/L 0.011 ≤ 0.1 0.001 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 No limit 11 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.
