ST LAURENT DU PONT PRINCIPALE · Saint-Pierre-de-Chartreuse
MAIRIE DE SAINT-LAURENT-DU-PONT
Water safety
Water safety
Parameter
Unfiltered tap water
Allowed range
Filtered
Free Chlorinemg CL2/l
0.05 ● (Near the limit)
0.2 – 1
0.001 ▲
Total Chlorinemg CL2/l
0.05
No limit
0.01
General
General
Parameter
Unfiltered tap water
Allowed range
Filtered
TemperatureC
10.5
No limit
10.5
Hardnessmg CaCO3/l
266.3
80 – 459
266.3
Hardness fF
26.6
No limit
26.6
pH
7.1
6.5 – 9.5
7.1
TurbidityNTU
0.11
≤ 4
0.011
ColorColor Units
5
≤ 15
5
ConductivityμS / cm
507
≤ 2,500
507
TDSmg/l
324.5estimated
0 – 1,199
324.5
Alkalinitymg CaCO3/l
273.5
No limit
273.5
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 Sept 2025
≤ 50
0.5
Fluoridemg F/l
0.05Sampled Sept 2025
≤ 1.5
0.015
Mercuryμg Hg/l
0.01Sampled Sept 2025
≤ 1
0.001
Nitritesmg NO2/l
0.01
≤ 0.5
0.004
Nitratesmg NO3/l
6.6
≤ 50
1.98
Minerals
Minerals
Parameter
Unfiltered tap water
Allowed range
Filtered
Magnesiummg/l
2.6Sampled Sept 2025
No limit
2.6
Calciummg/l
94.9Sampled Sept 2025
No limit
94.9
Potassiummg/l
1.1Sampled Sept 2025
No limit
1.1
Chloridemg/l
6.1
≤ 250
6.1
Metals
Metals
Parameter
Unfiltered tap water
Allowed range
Filtered
Aluminiumμg/l
10Sampled Sept 2025
≤ 200
10
Arsenicμg/l
2Sampled Sept 2025
≤ 10
1
Bariumμg/l
10Sampled Sept 2025
≤ 1,000
10
Ironμg/l
10Sampled Sept 2025
≤ 200
10
Manganeseμg/l
10Sampled Sept 2025
≤ 50
10
Leadμg/l
Not reported
≤ 10
—
Seleniumμg/l
2Sampled Sept 2025
≤ 10
2
Sodiummg/l
4.6Sampled Sept 2025
≤ 200
4.6
Chlorine by-products
Chlorine by-products
Parameter
Unfiltered tap water
Allowed range
Filtered
Trichloroethyleneμg/l
0.1Sampled Sept 2025
No limit
0.005
Total Trihalomethanesμg/l
0.5Sampled Sept 2025
≤ 100
0.025
Pesticides
Pesticides
Parameter
Unfiltered tap water
Allowed range
Filtered
Heptachlorug/L
0.005Sampled Sept 2025
≤ 0.4
0.005
Total pesticidesug/L
0.5 ● (Near the limit)Sampled Sept 2025
≤ 0.5
0.5 ●
Herbicides
Herbicides
Parameter
Unfiltered tap water
Allowed range
Filtered
D 2 4ug/L
0.02Sampled Sept 2025
≤ 70
0.02
Atrazineug/L
0.005Sampled Sept 2025
≤ 3
0.005
Perfluorinated chemicals
Perfluorinated chemicals
Parameter
Unfiltered tap water
Allowed range
Filtered
PFOAug/L
0.001Sampled Sept 2025
No limit
0.001
PFOSug/L
0.001Sampled Sept 2025
No limit
0.001
PFNAug/L
0.001Sampled Sept 2025
No limit
0.001
Total PFASug/L
0.029Sampled Sept 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
0.05
No limit
0.015
Sulfatemg/l
7.3
No limit
7.3
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.
