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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 19.5 No limit 19.5 Hardnessmg CaCO3/l 340 80 – 459 340 Hardness fF 34 No limit 34 pH 7.3 6.5 – 9.5 7.3 TurbidityNTU 0.2 ≤ 4 0.02 ConductivityμS / cm 582 ≤ 2,500 582 TDSmg/l 372.5estimated 0 – 1,199 372.5 Alkalinitymg CaCO3/l 301 No limit 301
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 2.1 ≤ 50 0.63
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 1.66Sampled Apr 2026 No limit 1.66 Calciummg/l 118Sampled Apr 2026 No limit 118 Chloridemg/l 5.6 ≤ 250 5.6
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Antimonyμg/l 1Sampled Jul 2025 ≤ 5 1 Arsenicμg/l Not reported ≤ 10 — Cadmiumμg/l 1Sampled Jul 2025 ≤ 5 1 Chromiumμg/l 2Sampled Jul 2025 ≤ 50 2 Copperμg/l 226Sampled Jul 2025 ≤ 2,000 11.3 Ironμg/l 10Sampled Jul 2025 ≤ 200 10 Leadμg/l 5.3Sampled Jul 2025 ≤ 10 0.27 Nickelμg/l 2Sampled Jul 2025 ≤ 20 2
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Total Trihalomethanesμg/l 0.5Sampled Jul 2025 ≤ 100 0.025
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 5.3 No limit 5.3
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.
