LONGNY LES VILLAGES SIAEP · Cour-Maugis sur Huisne
STGS SARL
Water safety
Water safety
Parameter
Unfiltered tap water
Allowed range
Filtered
Free Chlorinemg CL2/l
0.06 ● (Near the limit)
0.2 – 1
0.001 ▲
Total Chlorinemg CL2/l
0.15
No limit
0.03
General
General
Parameter
Unfiltered tap water
Allowed range
Filtered
TemperatureC
24
No limit
24
Hardnessmg CaCO3/l
277
80 – 459
277
Hardness fF
27.7
No limit
27.7
pH
7.7
6.5 – 9.5
7.7
TurbidityNTU
0.2
≤ 4
0.02
ConductivityμS / cm
500
≤ 2,500
500
TDSmg/l
320estimated
0 – 1,199
320
Alkalinitymg CaCO3/l
222
No limit
222
Bicarbonatemg HCO3/l
281Sampled May 2026
No limit
281
Pathogens
Pathogens
Parameter
Unfiltered tap water
Allowed range
Filtered
ClostridiumUFC/100ml
0Sampled Oct 2025
≤ 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 May 2026
≤ 50
0.5
Fluoridemg F/l
0.085Sampled May 2026
≤ 1.5
0.026
Mercuryμg Hg/l
0.05Sampled May 2026
≤ 1
0.005
Nitritesmg NO2/l
0.01
≤ 0.5
0.004
Nitratesmg NO3/l
0.5
≤ 50
0.15
Minerals
Minerals
Parameter
Unfiltered tap water
Allowed range
Filtered
Magnesiummg/l
6Sampled May 2026
No limit
6
Calciummg/l
92Sampled May 2026
No limit
92
Potassiummg/l
3.3Sampled May 2026
No limit
3.3
Chloridemg/l
13
≤ 250
13
Metals
Metals
Parameter
Unfiltered tap water
Allowed range
Filtered
Aluminiumμg/l
2Sampled May 2026
≤ 200
2
Antimonyμg/l
0.5Sampled May 2026
≤ 5
0.5
Arsenicμg/l
2.2Sampled May 2026
≤ 10
1.1
Bariumμg/l
2.1Sampled May 2026
≤ 1,000
2.1
Cadmiumμg/l
0.025Sampled May 2026
≤ 5
0.025
Chromiumμg/l
1Sampled May 2026
≤ 50
1
Ironμg/l
11.4
≤ 200
11.4
Manganeseμg/l
1Sampled May 2026
≤ 50
1
Leadμg/l
Not reported
≤ 10
—
Seleniumμg/l
0.5Sampled May 2026
≤ 10
0.5
Sodiummg/l
5.2Sampled May 2026
≤ 200
5.2
Chlorine by-products
Chlorine by-products
Parameter
Unfiltered tap water
Allowed range
Filtered
Trichloroethyleneμg/l
0.05Sampled May 2026
No limit
0.003
Total Trihalomethanesμg/l
13.3Sampled May 2026
≤ 100
0.67
Haloacetic acids
Haloacetic acids
Parameter
Unfiltered tap water
Allowed range
Filtered
Total haloacetic acidsμg/l
0.95Sampled May 2026
≤ 60
0.048
Pesticides
Pesticides
Parameter
Unfiltered tap water
Allowed range
Filtered
Heptachlorug/L
0.005Sampled May 2026
≤ 0.4
0.005
Total pesticidesug/L
0Sampled May 2026
≤ 0.5
0
Herbicides
Herbicides
Parameter
Unfiltered tap water
Allowed range
Filtered
D 2 4ug/L
0.02Sampled May 2026
≤ 70
0.02
Atrazineug/L
0.01Sampled May 2026
≤ 3
0.01
Perfluorinated chemicals
Perfluorinated chemicals
Parameter
Unfiltered tap water
Allowed range
Filtered
PFOAug/L
0.001Sampled May 2026
No limit
0.001
PFOSug/L
0.001Sampled May 2026
No limit
0.001
PFNAug/L
0.001Sampled May 2026
No limit
0.001
Total PFASug/L
0.011Sampled May 2026
≤ 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
0.05
No limit
0.015
Sulfatemg/l
24
No limit
24
Uraniumug/L
0.1Sampled May 2026
No limit
0.1
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.
