LA TRONCHE (PRE RIVOIRE) · Le Sappey-en-Chartreuse
GRENOBLE ALPES METROPOLE
Water safety
Water safety
Parameter
Unfiltered tap water
Allowed range
Filtered
Free Chlorinemg CL2/l
0.11 ● (Near the limit)
0.2 – 1
0.002 ▲
Total Chlorinemg CL2/l
0.14
No limit
0.028
General
General
Parameter
Unfiltered tap water
Allowed range
Filtered
TemperatureC
13.7
No limit
13.7
Hardnessmg CaCO3/l
270.8
80 – 459
270.8
Hardness fF
27.1
No limit
27.1
pH
7.8
6.5 – 9.5
7.8
TurbidityNTU
0.1
≤ 4
0.01
ColorColor Units
5
≤ 15
5
ConductivityμS / cm
548
≤ 2,500
548
TDSmg/l
350.7estimated
0 – 1,199
350.7
Alkalinitymg CaCO3/l
257.5
No limit
257.5
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 Oct 2025
≤ 50
0.5
Fluoridemg F/l
0.15Sampled Oct 2025
≤ 1.5
0.045
Mercuryμg Hg/l
0.01Sampled Oct 2025
≤ 1
0.001
Nitritesmg NO2/l
0.01
≤ 0.5
0.004
Nitratesmg NO3/l
1.36
≤ 50
0.41
Minerals
Minerals
Parameter
Unfiltered tap water
Allowed range
Filtered
Magnesiummg/l
16.6Sampled Oct 2025
No limit
16.6
Calciummg/l
88.3Sampled Oct 2025
No limit
88.3
Potassiummg/l
0.8Sampled Oct 2025
No limit
0.8
Chloridemg/l
2.5
≤ 250
2.5
Metals
Metals
Parameter
Unfiltered tap water
Allowed range
Filtered
Aluminiumμg/l
10Sampled Oct 2025
≤ 200
10
Antimonyμg/l
1Sampled Jul 2025
≤ 5
1
Arsenicμg/l
2Sampled Oct 2025
≤ 10
1
Bariumμg/l
24Sampled Oct 2025
≤ 1,000
24
Cadmiumμg/l
1Sampled Jul 2025
≤ 5
1
Chromiumμg/l
5Sampled Jul 2025
≤ 50
5
Copperμg/l
153Sampled Jul 2025
≤ 2,000
7.65
Ironμg/l
10Sampled Oct 2025
≤ 200
10
Manganeseμg/l
10Sampled Oct 2025
≤ 50
10
Leadμg/l
10 ● (Near the limit)Sampled Jul 2025
≤ 10
0.5
Nickelμg/l
5Sampled Jul 2025
≤ 20
5
Seleniumμg/l
2Sampled Oct 2025
≤ 10
2
Sodiummg/l
3Sampled Oct 2025
≤ 200
3
Chlorine by-products
Chlorine by-products
Parameter
Unfiltered tap water
Allowed range
Filtered
Trichloroethyleneμg/l
0.1Sampled Oct 2025
No limit
0.005
Total Trihalomethanesμg/l
7.18Sampled Oct 2025
≤ 100
0.36
Pesticides
Pesticides
Parameter
Unfiltered tap water
Allowed range
Filtered
Heptachlorug/L
0.005Sampled Oct 2025
≤ 0.4
0.005
Total pesticidesug/L
0.5 ● (Near the limit)Sampled Oct 2025
≤ 0.5
0.5 ●
Herbicides
Herbicides
Parameter
Unfiltered tap water
Allowed range
Filtered
D 2 4ug/L
0.02Sampled Oct 2025
≤ 70
0.02
Atrazineug/L
0.005Sampled Oct 2025
≤ 3
0.005
Perfluorinated chemicals
Perfluorinated chemicals
Parameter
Unfiltered tap water
Allowed range
Filtered
PFOAug/L
0.001Sampled Oct 2025
No limit
0.001
PFOSug/L
0.001Sampled Oct 2025
No limit
0.001
PFNAug/L
0.001Sampled Oct 2025
No limit
0.001
Total PFASug/L
0.029Sampled Oct 2025
≤ 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
21.6
No limit
21.6
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.
