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CU GRAND BESANÇON MÉTROPOLE
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l Not reported 0.2 – 1 —
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 17.1 No limit 17.1 Hardnessmg CaCO3/l 284 80 – 459 284 Hardness fF 28.4 No limit 28.4 pH 7.6 6.5 – 9.5 7.6 TurbidityNTU 0.34 ≤ 4 0.034 ConductivityμS / cm 546 ≤ 2,500 546 TDSmg/l 349.4estimated 0 – 1,199 349.4 Alkalinitymg CaCO3/l 266 No limit 266
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 Mercuryμg Hg/l Not reported ≤ 1 — Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 9.6 ≤ 50 2.88
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Chloridemg/l 5.3 ≤ 250 5.3
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Antimonyμg/l 1Sampled May 2025 ≤ 5 1 Arsenicμg/l Not reported ≤ 10 — Cadmiumμg/l 1Sampled May 2025 ≤ 5 1 Chromiumμg/l 2Sampled May 2025 ≤ 50 2 Ironμg/l 10Sampled May 2025 ≤ 200 10 Leadμg/l Not reported ≤ 10 —
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered Total PFASug/L Not reported ≤ 0.1 — 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 8.8 No limit 8.8
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.
