← Back to summary See all parameters LAVAL AGGLOMERATION SUD · Parné-sur-Roc
CA LAVAL AGGLOMÉRATION
Water safety Water safety Parameter Unfiltered tap water Allowed range Filtered Free Chlorinemg CL2/l 0.16 ● (Near the limit) 0.2 – 1 0.003 ▲ Total Chlorinemg CL2/l 0.2 No limit 0.04
General General Parameter Unfiltered tap water Allowed range Filtered TemperatureC 23 No limit 23 Hardnessmg CaCO3/l 147 80 – 459 147 Hardness fF 14.7 No limit 14.7 pH 8.3 6.5 – 9.5 8.3 TurbidityNTU 0.3 ≤ 4 0.03 ColorColor Units 5 ≤ 15 5 ConductivityμS / cm 468 ≤ 2,500 468 TDSmg/l 299.5estimated 0 – 1,199 299.5 Alkalinitymg CaCO3/l 91 No limit 91 Bicarbonatemg HCO3/l 94Sampled Nov 2025 No limit 94
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 Nov 2025 ≤ 50 0.25 Fluoridemg F/l 0.05Sampled Nov 2025 ≤ 1.5 0.015 Mercuryμg Hg/l 0.015Sampled Nov 2025 ≤ 1 0.002 Nitritesmg NO2/l 0.01 ≤ 0.5 0.004 Nitratesmg NO3/l 8.8 ≤ 50 2.64
Minerals Minerals Parameter Unfiltered tap water Allowed range Filtered Magnesiummg/l 6.5Sampled Nov 2025 No limit 6.5 Calciummg/l 32.1Sampled Nov 2025 No limit 32.1 Potassiummg/l 6.8Sampled Nov 2025 No limit 6.8 Chloridemg/l 77.3 ≤ 250 77.3
Metals Metals Parameter Unfiltered tap water Allowed range Filtered Aluminiumμg/l 61 ≤ 200 61 Antimonyμg/l 0.2Sampled May 2025 ≤ 5 0.2 Arsenicμg/l 0.2Sampled Nov 2025 ≤ 10 0.1 Bariumμg/l 21Sampled Nov 2025 ≤ 1,000 21 Cadmiumμg/l 0.01Sampled May 2025 ≤ 5 0.01 Chromiumμg/l 0.6Sampled May 2025 ≤ 50 0.6 Copperμg/l 36.7Sampled Jun 2026 ≤ 2,000 1.84 Ironμg/l 1Sampled Nov 2025 ≤ 200 1 Manganeseμg/l 1Sampled Nov 2025 ≤ 50 1 Leadμg/l 0.1Sampled Jun 2026 ≤ 10 0.005 Nickelμg/l 1.2Sampled Jun 2026 ≤ 20 1.2 Seleniumμg/l 0.2Sampled Nov 2025 ≤ 10 0.2 Sodiummg/l 32.1Sampled Nov 2025 ≤ 200 32.1
Chlorine by-products Chlorine by-products Parameter Unfiltered tap water Allowed range Filtered Trichloroethyleneμg/l 0.1Sampled Nov 2025 No limit 0.005 Total Trihalomethanesμg/l 38Sampled Jun 2026 ≤ 100 1.9
Haloacetic acids Haloacetic acids Parameter Unfiltered tap water Allowed range Filtered Total haloacetic acidsμg/l 0.89Sampled Jun 2026 ≤ 60 0.045
Pesticides Pesticides Parameter Unfiltered tap water Allowed range Filtered Chlordaneug/L 0Sampled Nov 2025 ≤ 2 0 Heptachlorug/L 0.001Sampled Nov 2025 ≤ 0.4 0.001 Total pesticidesug/L 0Sampled Nov 2025 ≤ 0.5 0
Herbicides Herbicides Parameter Unfiltered tap water Allowed range Filtered D 2 4ug/L 0.02Sampled Nov 2025 ≤ 70 0.02 Atrazineug/L 0.01Sampled Nov 2025 ≤ 3 0.01
Perfluorinated chemicals Perfluorinated chemicals Parameter Unfiltered tap water Allowed range Filtered PFOAug/L 0.001Sampled Oct 2025 No limit 0.001 PFOSug/L 0.002Sampled Oct 2025 No limit 0.002 PFNAug/L 0.001Sampled Oct 2025 No limit 0.001 Total PFASug/L 0.005Sampled Oct 2025 ≤ 0.1 0.001 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 0.043 No limit 0.013 Sulfatemg/l 14.8 No limit 14.8
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.
