← Back to summary See all parameters ROUEN LA JATTE · Bois-Guillaume
METROPOLE ROUEN NORMANDIE
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.34 0.2 – 1 0.007 ▲ Total Chlorinemg CL2/l 0.36 No limit 0.072
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 17 No limit 17 Hardnessmg CaCO3/l 264 80 – 459 264 Hardness fF 26.4 No limit 26.4 pH 7.8 6.5 – 9.5 7.8 TurbidityNTU 0.12 ≤ 4 0.012 ConductivityμS / cm 596 ≤ 2,500 596 TDSmg/l 381.4estimated 0 – 1,199 381.4 Alkalinitymg CaCO3/l 257 No limit 257 Bicarbonatemg HCO3/l 310Sampled Apr 2026 No limit 310
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 10Sampled Apr 2026 ≤ 50 0.5 Fluoridemg F/l 0.1Sampled Apr 2026 ≤ 1.5 0.03 Mercuryμg Hg/l 0.015Sampled Apr 2026 ≤ 1 0.002 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 24.2 ≤ 50 7.26
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 3.6Sampled Apr 2026 No limit 3.6 Calciummg/l 118Sampled Apr 2026 No limit 118 Potassiummg/l 1.7Sampled Apr 2026 No limit 1.7 Chloridemg/l 15.7 ≤ 250 15.7
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 1.4Sampled Apr 2026 ≤ 200 1.4 Antimonyμg/l 0.5Sampled Apr 2026 ≤ 5 0.5 Arsenicμg/l 0.25Sampled Apr 2026 ≤ 10 0.13 Bariumμg/l 21.7Sampled Apr 2026 ≤ 1,000 21.7 Cadmiumμg/l 0.025Sampled Apr 2026 ≤ 5 0.025 Chromiumμg/l 0.87Sampled Apr 2026 ≤ 50 0.87 Copperμg/l 31.2Sampled Jul 2026 ≤ 2,000 1.56 Ironμg/l 1Sampled Apr 2026 ≤ 200 1 Manganeseμg/l 0.5Sampled Apr 2026 ≤ 50 0.5 Leadμg/l 1.3Sampled Jul 2026 ≤ 10 0.065 Nickelμg/l 0.5Sampled Jul 2026 ≤ 20 0.5 Seleniumμg/l 0.55Sampled Apr 2026 ≤ 10 0.55 Sodiummg/l 8.7Sampled Apr 2026 ≤ 200 8.7
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 2.3Sampled Apr 2026 ≤ 100 0.12
Haloacetic acids Haloacetic acids Parameter Unfiltered tap water Allowed range Filtered Total haloacetic acidsμg/l 0.5Sampled Apr 2026 ≤ 60 0.025
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Heptachlorug/L 0.005Sampled Apr 2026 ≤ 0.4 0.005 Total pesticidesug/L 0.11Sampled Apr 2026 ≤ 0.5 0.11
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Jul 2026 ≤ 70 0.02 Atrazineug/L 0.01Sampled Jul 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 0.02 No limit 0.006 Sulfatemg/l 9.41 No limit 9.41
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.
