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CORENC-LA TRONCHE (DHUY) · Le Sappey-en-Chartreuse

GRENOBLE ALPES METROPOLE

Water safety

Water safety
Parameter	Unfiltered tap water	Allowed range	Filtered
Free Chlorinemg CL2/l	0.15 (Near the limit)	0.2 – 1	0.003
Total Chlorinemg CL2/l	0.25	No limit	0.05

General

General
Parameter	Unfiltered tap water	Allowed range	Filtered
TemperatureC	23.3	No limit	23.3
Hardnessmg CaCO3/l	42.9 (Near the limit)	80 – 459	42.9
Hardness fF	4.29	No limit	4.29
pH	7.1	6.5 – 9.5	7.1
TurbidityNTU	0.25	≤ 4	0.025
ColorColor Units	5	≤ 15	5
ConductivityμS / cm	94	≤ 2,500	94
TDSmg/l	60.2estimated	0 – 1,199	60.2
Alkalinitymg CaCO3/l	38.5	No limit	38.5

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 Jul 2026	≤ 50	0.5
Fluoridemg F/l	0.05Sampled Jul 2026	≤ 1.5	0.015
Mercuryμg Hg/l	0.01Sampled Jul 2026	≤ 1	0.001
Nitritesmg NO2/l	0.01	≤ 0.5	0.004
Nitratesmg NO3/l	1.2	≤ 50	0.36

Minerals

Minerals
Parameter	Unfiltered tap water	Allowed range	Filtered
Magnesiummg/l	1.4Sampled Jul 2026	No limit	1.4
Calciummg/l	13.3Sampled Jul 2026	No limit	13.3
Potassiummg/l	0.1Sampled Jul 2026	No limit	0.1
Chloridemg/l	0.5	≤ 250	0.5

Metals

Metals
Parameter	Unfiltered tap water	Allowed range	Filtered
Aluminiumμg/l	25Sampled Jul 2026	≤ 200	25
Antimonyμg/l	1Sampled Jul 2026	≤ 5	1
Arsenicμg/l	2Sampled Jul 2026	≤ 10	1
Bariumμg/l	10Sampled Jul 2026	≤ 1,000	10
Cadmiumμg/l	1Sampled Jul 2026	≤ 5	1
Chromiumμg/l	5Sampled Jul 2026	≤ 50	5
Copperμg/l	25Sampled Sept 2025	≤ 2,000	1.25
Ironμg/l	11Sampled Jul 2026	≤ 200	11
Manganeseμg/l	10Sampled Jul 2026	≤ 50	10
Leadμg/l	2Sampled Sept 2025	≤ 10	0.1
Nickelμg/l	5Sampled Sept 2025	≤ 20	5
Seleniumμg/l	2Sampled Jul 2026	≤ 10	2
Sodiummg/l	0.8Sampled Jul 2026	≤ 200	0.8

Chlorine by-products

Chlorine by-products
Parameter	Unfiltered tap water	Allowed range	Filtered
Trichloroethyleneμg/l	0.1Sampled Jul 2026	No limit	0.005
Total Trihalomethanesμg/l	7.6Sampled Jul 2026	≤ 100	0.38

Haloacetic acids

Haloacetic acids
Parameter	Unfiltered tap water	Allowed range	Filtered
Total haloacetic acidsμg/l	3.2Sampled Jul 2026	≤ 60	0.16

Pesticides

Pesticides
Parameter	Unfiltered tap water	Allowed range	Filtered
Heptachlorug/L	0.005Sampled Jul 2026	≤ 0.4	0.005
Total pesticidesug/L	0.5 (Near the limit)Sampled Jul 2026	≤ 0.5	0.5

Herbicides

Herbicides
Parameter	Unfiltered tap water	Allowed range	Filtered
D 2 4ug/L	0.02Sampled Jul 2026	≤ 70	0.02
Atrazineug/L	0.005Sampled Jul 2026	≤ 3	0.005

Perfluorinated chemicals

Perfluorinated chemicals
Parameter	Unfiltered tap water	Allowed range	Filtered
PFOAug/L	0.001Sampled Jul 2026	No limit	0.001
PFOSug/L	0.001Sampled Jul 2026	No limit	0.001
PFNAug/L	0.001Sampled Jul 2026	No limit	0.001
Total PFASug/L	0.029Sampled Jul 2026	≤ 0.1	0.003
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	6.7	No limit	6.7
Uraniumug/L	10Sampled Jul 2026	No limit	10

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.