LA RUCHERE BAS SERVICE · Saint-Pierre-de-Chartreuse
MAIRIE DE SAINT-CHRISTOPHE-SUR-GUIE
Water safety
Water safety
Parameter
Unfiltered tap water
Allowed range
Filtered
Free Chlorinemg CL2/l
0.52
0.2 – 1
0.01 ▲
Total Chlorinemg CL2/l
0.55
No limit
0.11
General
General
Parameter
Unfiltered tap water
Allowed range
Filtered
TemperatureC
17.8
No limit
17.8
Hardnessmg CaCO3/l
154.9Sampled Mar 2026
80 – 459
154.9
Hardness fF
15.5Sampled Mar 2026
No limit
15.5
pH
7.7
6.5 – 9.5
7.7
TurbidityNTU
0.51
≤ 4
0.051
ColorColor Units
5
≤ 15
5
ConductivityμS / cm
337
≤ 2,500
337
TDSmg/l
215.7estimated
0 – 1,199
215.7
Alkalinitymg CaCO3/l
162.5Sampled Mar 2026
No limit
162.5
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 Mar 2025
≤ 50
0.5
Fluoridemg F/l
0.09Sampled Mar 2025
≤ 1.5
0.027
Mercuryμg Hg/l
0.01Sampled Mar 2025
≤ 1
0.001
Nitritesmg NO2/l
0.01Sampled Mar 2026
≤ 0.5
0.004
Nitratesmg NO3/l
1.42Sampled Mar 2026
≤ 50
0.43
Minerals
Minerals
Parameter
Unfiltered tap water
Allowed range
Filtered
Magnesiummg/l
4.6Sampled Mar 2025
No limit
4.6
Calciummg/l
58.4Sampled Mar 2025
No limit
58.4
Potassiummg/l
0.3Sampled Mar 2025
No limit
0.3
Chloridemg/l
1.6Sampled Mar 2026
≤ 250
1.6
Metals
Metals
Parameter
Unfiltered tap water
Allowed range
Filtered
Aluminiumμg/l
44Sampled Mar 2025
≤ 200
44
Arsenicμg/l
2Sampled Mar 2025
≤ 10
1
Bariumμg/l
10Sampled Mar 2025
≤ 1,000
10
Copperμg/l
37Sampled Jun 2026
≤ 2,000
1.85
Ironμg/l
18Sampled Mar 2025
≤ 200
18
Manganeseμg/l
10Sampled Mar 2025
≤ 50
10
Leadμg/l
2Sampled Jun 2026
≤ 10
0.1
Nickelμg/l
5Sampled Jun 2026
≤ 20
5
Seleniumμg/l
2Sampled Mar 2025
≤ 10
2
Sodiummg/l
1.7Sampled Mar 2025
≤ 200
1.7
Chlorine by-products
Chlorine by-products
Parameter
Unfiltered tap water
Allowed range
Filtered
Trichloroethyleneμg/l
0.1Sampled Mar 2025
No limit
0.005
Total Trihalomethanesμg/l
47Sampled Mar 2025
≤ 100
2.35
Pesticides
Pesticides
Parameter
Unfiltered tap water
Allowed range
Filtered
Heptachlorug/L
0.005Sampled Mar 2025
≤ 0.4
0.005
Total pesticidesug/L
0.5 ● (Near the limit)Sampled Mar 2025
≤ 0.5
0.5 ●
Herbicides
Herbicides
Parameter
Unfiltered tap water
Allowed range
Filtered
D 2 4ug/L
0.02Sampled Mar 2025
≤ 70
0.02
Atrazineug/L
0.005Sampled Mar 2025
≤ 3
0.005
Perfluorinated chemicals
Perfluorinated chemicals
Parameter
Unfiltered tap water
Allowed range
Filtered
PFOAug/L
0.001Sampled Mar 2025
No limit
0.001
PFOSug/L
0.001Sampled Mar 2025
No limit
0.001
PFNAug/L
0.001Sampled Mar 2025
No limit
0.001
Total PFASug/L
0.018Sampled Mar 2025
≤ 0.1
0.002
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
0.01Sampled Mar 2026
No limit
0.003
Sulfatemg/l
7.4Sampled Mar 2026
No limit
7.4
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.
