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CU GRAND BESANÇON MÉTROPOLE
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.03 ▲ (Outside the range) 0.2 – 1 0.001 ▲ Total Chlorinemg CL2/l 0.04 No limit 0.008
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 21.2 No limit 21.2 Hardnessmg CaCO3/l 261 80 – 459 261 Hardness fF 26.1 No limit 26.1 pH 7.4 6.5 – 9.5 7.4 TurbidityNTU 0.2 ≤ 4 0.02 ConductivityμS / cm 516 ≤ 2,500 516 TDSmg/l 330.2estimated 0 – 1,199 330.2 Alkalinitymg CaCO3/l 240 No limit 240 Bicarbonatemg HCO3/l 299Sampled Jun 2025 No limit 299
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 Feb 2026 ≤ 50 0.5 Fluoridemg F/l 0.08Sampled Feb 2026 ≤ 1.5 0.024 Mercuryμg Hg/l 0.015Sampled Feb 2026 ≤ 1 0.002 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 8.1 ≤ 50 2.43
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 2.68Sampled Feb 2026 No limit 2.68 Calciummg/l 99.2Sampled Feb 2026 No limit 99.2 Potassiummg/l 1.75Sampled Feb 2026 No limit 1.75 Chloridemg/l 11 ≤ 250 11
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 10Sampled Feb 2026 ≤ 200 10 Antimonyμg/l 1Sampled Feb 2026 ≤ 5 1 Arsenicμg/l 1Sampled Feb 2026 ≤ 10 0.5 Bariumμg/l 13.3Sampled Feb 2026 ≤ 1,000 13.3 Cadmiumμg/l 1Sampled Feb 2026 ≤ 5 1 Chromiumμg/l 2Sampled Feb 2026 ≤ 50 2 Copperμg/l 324Sampled Feb 2026 ≤ 2,000 16.2 Ironμg/l 10Sampled Feb 2026 ≤ 200 10 Manganeseμg/l 2Sampled Feb 2026 ≤ 50 2 Leadμg/l 6.2Sampled Feb 2026 ≤ 10 0.31 Nickelμg/l 11.3Sampled Feb 2026 ≤ 20 11.3 Seleniumμg/l 1Sampled Feb 2026 ≤ 10 1 Sodiummg/l 6.35Sampled Feb 2026 ≤ 200 6.35
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Feb 2026 No limit 0.005 Total Trihalomethanesμg/l 2.02Sampled Feb 2026 ≤ 100 0.1
Haloacetic acids Haloacetic acids Parameter Unfiltered tap water Allowed range Filtered Total haloacetic acidsμg/l 0.5Sampled Feb 2026 ≤ 60 0.025
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled Feb 2026 ≤ 0.4 0.005 Total pesticidesug/L 0.11Sampled Feb 2026 ≤ 0.5 0.11
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Feb 2026 ≤ 70 0.02 Atrazineug/L 0.005Sampled Feb 2026 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.003Sampled Feb 2026 No limit 0.003 PFOSug/L 0.011Sampled Feb 2026 No limit 0.011 PFNAug/L 0.001Sampled Feb 2026 No limit 0.001 Total PFASug/L 0.028Sampled Feb 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 Sulfatemg/l 10 No limit 10 Uraniumug/L 10Sampled Feb 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.
