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SIAEP LE HORPS
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.17 ● (Near the limit) 0.2 – 1 0.003 ▲ Total Chlorinemg CL2/l 0.21 No limit 0.042
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 17 No limit 17 Hardnessmg CaCO3/l 94 80 – 459 94 Hardness fF 9.4 No limit 9.4 pH 7 6.5 – 9.5 7 TurbidityNTU 0.3 ≤ 4 0.03 ColorColor Units 5 ≤ 15 5 ConductivityμS / cm 228 ≤ 2,500 228 TDSmg/l 145.9estimated 0 – 1,199 145.9 Alkalinitymg CaCO3/l 84 No limit 84 Bicarbonatemg HCO3/l 56Sampled Feb 2026 No limit 56
Pathogens Pathogens Parameter Unfiltered tap water Allowed range Filtered ClostridiumUFC/100ml 0 ≤ 0 0 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 5Sampled Aug 2025 ≤ 50 0.25 Fluoridemg F/l 0.1Sampled Aug 2025 ≤ 1.5 0.03 Mercuryμg Hg/l 0.015Sampled Aug 2025 ≤ 1 0.002 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 11 ≤ 50 3.3
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 3.3Sampled Feb 2026 No limit 3.3 Calciummg/l 17.4Sampled Feb 2026 No limit 17.4 Potassiummg/l 1.1Sampled Feb 2026 No limit 1.1 Chloridemg/l 10.1 ≤ 250 10.1
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 10Sampled Aug 2025 ≤ 200 10 Arsenicμg/l 0.2Sampled Aug 2025 ≤ 10 0.1 Bariumμg/l 26Sampled Aug 2025 ≤ 1,000 26 Copperμg/l 169 ≤ 2,000 8.45 Ironμg/l 5 ≤ 200 5 Manganeseμg/l 2 ≤ 50 2 Leadμg/l 0.7 ≤ 10 0.035 Nickelμg/l 1.6 ≤ 20 1.6 Seleniumμg/l 0.2Sampled Aug 2025 ≤ 10 0.2 Sodiummg/l 5.6Sampled Feb 2026 ≤ 200 5.6
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Aug 2025 No limit 0.005 Total Trihalomethanesμg/l 9.1 ≤ 100 0.46
Haloacetic acids Haloacetic acids Parameter Unfiltered tap water Allowed range Filtered Total haloacetic acidsμg/l 0.94 ≤ 60 0.047
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Chlordaneug/L 0Sampled Aug 2025 ≤ 2 0 Heptachlorug/L 0.001Sampled Aug 2025 ≤ 0.4 0.001 Total pesticidesug/L 0Sampled Aug 2025 ≤ 0.5 0
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Aug 2025 ≤ 70 0.02 Atrazineug/L 0.01Sampled Aug 2025 ≤ 3 0.01
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Feb 2026 No limit 0.001 PFOSug/L 0.002Sampled Feb 2026 No limit 0.002 PFNAug/L 0.001Sampled Feb 2026 No limit 0.001 Total PFASug/L 0Sampled Feb 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 0.011 No limit 0.003 Sulfatemg/l 5 No limit 5
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.
