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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 0.03 No limit 0.006
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 16.3 No limit 16.3 Hardnessmg CaCO3/l 314 80 – 459 314 Hardness fF 31.4 No limit 31.4 pH 7.4 6.5 – 9.5 7.4 TurbidityNTU 0.2 ≤ 4 0.02 ConductivityμS / cm 537 ≤ 2,500 537 TDSmg/l 343.7estimated 0 – 1,199 343.7 Alkalinitymg CaCO3/l 270 No limit 270
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 May 2026 ≤ 50 0.5 Fluoridemg F/l 0.05Sampled May 2026 ≤ 1.5 0.015 Mercuryμg Hg/l 0.015Sampled May 2026 ≤ 1 0.002 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 14 ≤ 50 4.2
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 1.59Sampled May 2026 No limit 1.59 Calciummg/l 109Sampled May 2026 No limit 109 Potassiummg/l 0.5Sampled May 2026 No limit 0.5 Chloridemg/l 2.3 ≤ 250 2.3
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 10Sampled May 2026 ≤ 200 10 Antimonyμg/l 1Sampled May 2026 ≤ 5 1 Arsenicμg/l 1Sampled May 2026 ≤ 10 0.5 Bariumμg/l 10Sampled May 2026 ≤ 1,000 10 Cadmiumμg/l 1Sampled May 2026 ≤ 5 1 Chromiumμg/l 2Sampled May 2026 ≤ 50 2 Copperμg/l 25.1Sampled May 2026 ≤ 2,000 1.26 Ironμg/l 10Sampled May 2026 ≤ 200 10 Manganeseμg/l 2Sampled May 2026 ≤ 50 2 Leadμg/l 2.9Sampled May 2026 ≤ 10 0.15 Nickelμg/l 2Sampled May 2026 ≤ 20 2 Seleniumμg/l 1Sampled May 2026 ≤ 10 1 Sodiummg/l 1.79Sampled May 2026 ≤ 200 1.79
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled May 2026 No limit 0.005 Total Trihalomethanesμg/l 0.1Sampled May 2026 ≤ 100 0.005
Haloacetic acids Haloacetic acids Parameter Unfiltered tap water Allowed range Filtered Total haloacetic acidsμg/l 0.5Sampled May 2026 ≤ 60 0.025
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled May 2026 ≤ 0.4 0.005 Total pesticidesug/L 0.5 ● (Near the limit) Sampled May 2026 ≤ 0.5 0.5 ●
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled May 2026 ≤ 70 0.02 Atrazineug/L 0.005Sampled May 2026 ≤ 3 0.005
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled May 2026 No limit 0.001 PFOSug/L 0.001Sampled May 2026 No limit 0.001 PFNAug/L 0.001Sampled May 2026 No limit 0.001 Total PFASug/L 0.029Sampled May 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 4.8 No limit 4.8 Uraniumug/L 10Sampled May 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.
Your Water Quality
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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.
