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Westchester County Private Well Testing Law (PWT) Analysis

We are a NELAC Certified Environmental Testing Laboratory

Westchester County Private Well Testing Law Required Testing Parameters and Maximum Contaminant Levels

Volatile Organic Compounds1 Standard Units MCL*, AL, Guideline or Optimal Range
  • Benzene
  • Bromobenzene
  • Bromochloromethane
  • Bromomethane
  • N-Butylbenzene
  • Sec-Butylbenzene
  • Tert-Butylbenzene
  • Carbon Tetrachloride
  • Chlorobenzene
  • Chloroethane
  • Chloromethane
  • 2-Chlorotoluene
  • 4-Chlorotoluene
  • Dibromomethane
  • 1,2-Dichlorobenzene
  • 1,3- Dichlorobenzene
  • 1,4- Dichlorobenzene
  • Dichlorodifluoromethane
  • 1,1-Dichloroethane
  • 1,2-Dichloroethane
  • 1,1-Dichloroethene
  • cis-1,2-Dichloroethene
  • trans-1,2-Dichloroethene
  • 1,2-Dichloropropane
  • 1,3-Dichloropropane
  • 2,2-Dichloropropane
  • 1,1-Dichloropropene
  • cis-1,3-Dichloropropene
  • trans-1,3-Dichloropropene
  • Ethylbenzene
  • Isopropylbenzene
  • p-Isopropyltoluene
  • Methylene Chloride
  • n-Propylbenzene
  • Styrene
  • 1,1,1,2-Tetrachloroethane
  • 1,1,2,2-Tetrachloroethane
  • Tetrachloroethene
  • Toluene
  • 1,2,3-Trichlorobenzene
  • 1,2,4-Trichlorobenzene
  • 1,1,1-Trichloroethane
  • 1,1,2-Trichloroethan
  • Trichloroethene
  • Trichlorofluoromethane
  • 1,2,3-Trichloropropane
  • 1,2,4-Trimethylbenzene
  • 1,3,5-Trimethylbenzene
  • m-Xylene
  • o-Xylene
  • p-Xylene
  • methyl-tertiary-butyl-ether
  • Vinyl Chloride
 5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
10
2		 ug/L
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ug/L
ug/L		 MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL
MCL

Inorganic Compounds
  • Arsenic
  • Nitrates
  • Lead (First Draw)
  • Lead (Flashed)
 0.010
10
0.0150.015		 mg/L
mg/L
mg/L		 MCL
MCL
AL**AL**

Microbiological Parameters
  • Total Coliform
  • E-Coli
 zero
zero		 presence/absence
presence/absence		 MCL
MCL

Secondary Drinking Water Contaminants
  • pH
  • Iron
  • Manganese
  • Sodium
  • Chloride
 6.5 to 8.0
0.3
0.3
No designated limits3
250		 unitless
mg/L
mg/L
mg/L
mg/L		 Optimal Range
Guideline
Guideline
Guideline
MCL
Notes
1VOCs from NYSDOH Subpart 5-1 Table 9D (POCs) plus MTBE, Vinyl Chloride.
2Water containing more than 270 mg/L sodium should not be used for drinking by persons on moderately sodium restricted diets.
3Water containing more than 270 mg/L sodium should not be used for drinking by persons on moderately sodium restricted diets.
*Maximum Contaminant Level (MCL) – Maximum permissible level of a contaminant in drinking water as established in Part 5 of the New York State Sanitary Code.
**AL=”Action Level” means the concentration of lead that when exceeded triggers the need for treatment or remedial action.