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SIAEP DU PERCH'EST
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.06 ● (Near the limit) 0.2 – 1 0.001 ▲ Total Chlorinemg CL2/l 0.11 No limit 0.022
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 16 No limit 16 Hardnessmg CaCO3/l 326 80 – 459 326 Hardness fF 32.6 No limit 32.6 pH 7.8 6.5 – 9.5 7.8 TurbidityNTU 0.2 ≤ 4 0.02 ConductivityμS / cm 656 ≤ 2,500 656 TDSmg/l 419.8estimated 0 – 1,199 419.8 Alkalinitymg CaCO3/l 269 No limit 269 Bicarbonatemg HCO3/l 326Sampled Apr 2026 No limit 326
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 Apr 2026 ≤ 50 0.5 Fluoridemg F/l 0.081Sampled Apr 2026 ≤ 1.5 0.024 Mercuryμg Hg/l 0.05Sampled Apr 2026 ≤ 1 0.005 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 33 ≤ 50 9.9
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 2.3Sampled Apr 2026 No limit 2.3 Calciummg/l 130Sampled Apr 2026 No limit 130 Potassiummg/l 1.2Sampled Apr 2026 No limit 1.2 Chloridemg/l 20 ≤ 250 20
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 2Sampled Apr 2026 ≤ 200 2 Antimonyμg/l 0.5Sampled Apr 2026 ≤ 5 0.5 Arsenicμg/l 1.5Sampled Apr 2026 ≤ 10 0.75 Bariumμg/l 1Sampled Apr 2026 ≤ 1,000 1 Cadmiumμg/l 0.1Sampled Apr 2026 ≤ 5 0.1 Chromiumμg/l 1Sampled Apr 2026 ≤ 50 1 Ironμg/l 1.1Sampled Apr 2026 ≤ 200 1.1 Manganeseμg/l 1Sampled Apr 2026 ≤ 50 1 Leadμg/l Not reported ≤ 10 — Seleniumμg/l 0.98Sampled Apr 2026 ≤ 10 0.98 Sodiummg/l 5.9Sampled Apr 2026 ≤ 200 5.9
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.05Sampled Apr 2026 No limit 0.003 Total Trihalomethanesμg/l 9.37Sampled Apr 2026 ≤ 100 0.47
Haloacetic acids Haloacetic acids Parameter Unfiltered tap water Allowed range Filtered Total haloacetic acidsμg/l 2.4Sampled Apr 2026 ≤ 60 0.12
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled Apr 2026 ≤ 0.4 0.005 Total pesticidesug/L 0.15Sampled Apr 2026 ≤ 0.5 0.15
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Apr 2026 ≤ 70 0.02 Atrazineug/L 0.01Sampled Apr 2026 ≤ 3 0.01
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Apr 2026 No limit 0.001 PFOSug/L 0.001Sampled Apr 2026 No limit 0.001 PFNAug/L 0.001Sampled Apr 2026 No limit 0.001 Total PFASug/L 0Sampled Apr 2026 ≤ 0.1 0 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 0.05 No limit 0.015 Sulfatemg/l 23 No limit 23 Uraniumug/L 0.56Sampled Apr 2026 No limit 0.56
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
Independent information about tap water quality in France.
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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.
