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Maximum Contaminant Levels for Drinking Water

Maximum Contaminant Levels for Drinking Water
Inorganic Chemicals (IOCs)Antimony0.006 mg/l
Arsenic0.01 mg/l
Barium2 mg/l
Beryllium0.004 mg/l
Cadmium0.005 mg/l
Chromium0.1 mg/l
Cyanide (free)0.2 mg/l
Fluoride (Adjusted)*2 mg/l
Fluoride (Natural)*4 mg/l
Mercury0.002 mg/l
Selenium0.05 mg/l
Thallium0.002 mg/l
Nitrate10 mg/l
Nitrite1 mg/l
Total Nitrate & Nitrite10 mg/l
Sodium*No MCL
AsbestosAsbestos7 MFL**
Lead & CopperLead Action Level0.015 mg/l
Copper Action Level1.3 mg/l
Radionuclides*Gross Alpha15 PCi/l
Gross Alpha Action Level5 PCi/l
Radium-226 Action Level3 PCi/l
Radium-226 & Radium-228 (combined)5 PCi/l
Volatile Organic Compounds (VOCs)1,1-Dichloroethylene7 μg/l
1,1,1-Trichloroethane200 μg/l
1,1,2-Trichloroethane5 μg/l
1,2-Dichloroethane5 μg/l
1,2-Dichloropropane5 μg/l
1,2,4-Trichlorobenzene70 μg/l
Benzene5 μg/l
Carbon Tetrachloride5 μg/l
Cis-1,2-Dichloroethylene70 μg/l
Dichloromethane5 μg/l
Ethylbenzene700 μg/l
Monochlorobenzene100 μg/l
o-Dichlorobenzene600 μg/l
p-Dichlorobenzene75 μg/l
Styrene100 μg/l
Tetrachloroethylene5 μg/l
Toluene1000 μg/l
Trans-1,2-Dichloroethylene100 μg/l
Trichloroethylene5 μg/l
Vinyl Chloride2 μg/l
Xylenes (total)104 μg/l
Disinfection ByproductsTotal Trihalomethanes****80 μg/l
Haloacetic Acids 5*****60 μg/l
Synthetic Organic Compounds (SOCs)2,4-D70 μg/l
2,4,5-TP (Silvex)50 μg/l
Alachlor2 μg/l
Atrazine3 μg/l
Benzo(a)pyrene0.2 μg/l
Carbofuran40 μg/l
Chlordane2 μg/l
Dalapon200 μg/l
Di(2-ethylhexyl)adipate400 μg/l
Di(2-ethylhexyl)phthalate6 μg/l
Dibromochloropropane (DBCP)0.2 μg/l
Dinoseb7 μg/l
Dioxin (2,3,7,8-TCDD)3x10-5 μg/l
Diquat20 μg/l
Endothall100 μg/l
Endrin2 μg/l
Ethylene Dibromide (EDB)0.05 μg/l
Glyphosate700 μg/l
Heptachlor0.4 μg/l
Heptachlor epoxide0.2 μg/l
Hexachlorobenzene1 μg/l
Hexachlorocyclopentadiene50 μg/l
Lindane0.2 μg/l
Methoxychlor40 μg/l
Oxamyl (Vydate)200 μg/l
PCBs0.5 μg/l
Pentachlorophenol1 μg/l
Picloram500 μg/l
Simazine4 μg/l
Toxaphene3 μg/l

* Community Water Systems Only

** MFL=million fibers/liter > 10 micron

*** The average annual concentration of beta particle and photon radioactivity from manmade radionuclides in drinking water shall not produce an annual dose equivalent to the total body or any internal organ greater than four (4) millirem per year.

**** The sum of the concentrations of bromodichlormethane, dibromochloromethane, tribromomethane (bromoform), and trichloromethane (chloroform).

***** The sum of the concentrations of monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, bromoacetic acid, and dibromoacetic acid.

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