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PRIVATE WELL TESTING ACT PROGRAM - page 33 / 75

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Table 2: Regulated Volatile Organics Compounds, MCLs and Sources

Volatile Organic Compounds

MCL* (in µg/l)

Benzene

1

Carbon Tetrachloride

2

Chlorobenzene

50

1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene 1,1-Dichloroethane

600 600 75 50

1,2-Dichloroethane 1,1-Dichloroethylene cis-1,2-Dichloroethylene trans-1,2-Dichloroethylene 1,2-Dichloropropane Ethylbenzene Methyl-tertiary Butyl Ether

2 2 70 100 5 700 70

Methylene Chloride Naphthalene

3 300

Styrene

100

1,1,2,2-Tetrachloroethane Tetrachloroethylene Toluene

1 1 1000

1,2,4-Trichlorobenzene 1,1,1-Trichloroethane

9 30

1,1,2-Trichloroethane Trichloroethylene

3 1

Vinyl Chloride

2

Xylenes

1000

Sources of Contaminants in Ground Water

Discharge from factories; leaching from gas storage tanks and landfills Discharge from chemical plants and other industrial activities Discharge from chemical and agricultural chemical factories Discharge from industrial chemical factories

Discharge from industrial chemical factories Discharge from industrial chemical factories

Discharge from metal degreasing sites and other factories Discharge from industrial chemical factories

Discharge from industrial chemical factories Discharge from industrial chemical factories Discharge from industrial chemical factories Discharge from industrial chemical factories Discharge from petroleum refineries

Leaking underground gasoline and fuel oil tanks; Gasoline and fuel oil spills. Discharge from drug and chemical factories

Discharge from industrial chemical factories; exposure to mothballs Discharge from rubber and plastic factories; leaching from landfills Discharge from industrial chemical factories

Discharge from factories and dry cleaners

Discharge from petroleum factories and underground storage tanks. Discharge from textile finishing factories

Discharge from metal degreasing sites and other factories Discharge from industrial chemical factories

Discharge from metal degreasing sites and other factories Leaching from PVC pipes; discharge from plastic factories Discharge from petroleum factories; discharge from chemical factories and underground storage tanks.

*MCL= Maximum Contaminant Level Units of Measure= µg/l = micrograms/liter (parts per billion)

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