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Indiana Department of Environmental Management

IDEM > Compliance > Water Compliance > Drinking Water Compliance Evaluation > Maximum Contaminant Levels for Drinking Water Maximum Contaminant Levels for Drinking Water

Type Contaminant MCL
Inorganic Chemicals (IOCs) Antimony 0.006 mg/l
Arsenic 0.01 mg/l
Barium 2 mg/l
Beryllium 0.004 mg/l
Cadmium 0.005 mg/l
Chromium 0.1 mg/l
Cyanide (free) 0.2 mg/l
Fluoride (Adjusted)* 2 mg/l
Fluoride (Natural)* 4 mg/l
Mercury 0.002 mg/l
Nickel ---
Selenium 0.05 mg/l
Thallium 0.002 mg/l
Nitrate 10 mg/l
Nitrite 1 mg/l
Total Nitrate & Nitrite 10 mg/l
Sodium* No MCL
Asbestos Asbestos 7 MFL**
Lead & Copper Lead Action Level 0.015 mg/l
Copper Action Level 1.3 mg/l
Radionuclides* Gross Alpha 15 PCi/l
Gross Alpha Action Level 5 PCi/l
Radium-226 Action Level 3 PCi/l
Radium-226 & Radium-228 (combined) 5 PCi/l
Manmade ***
Volatile Organic Compounds (VOCs) 1,1-Dichloroethylene 7 μg/l
1,1,1-Trichloroethane 200 μg/l
1,1,2-Trichloroethane 5 μg/l
1,2-Dichloroethane 5 μg/l
1,2-Dichloropropane 5 μg/l
1,2,4-Trichlorobenzene 70 μg/l
Benzene 5 μg/l
Carbon Tetrachloride 5 μg/l
Cis-1,2-Dichloroethylene 70 μg/l
Dichloromethane 5 μg/l
Ethylbenzene 700 μg/l
Monochlorobenzene 100 μg/l
o-Dichlorobenzene 600 μg/l
p-Dichlorobenzene 75 μg/l
Styrene 100 μg/l
Tetrachloroethylene 5 μg/l
Toluene 1000 μg/l
Trans-1,2-Dichloroethylene 100 μg/l
Trichloroethylene 5 μg/l
Vinyl Chloride 2 μg/l
Xylenes (total) 104 μg/l
Disinfection Byproducts Total Trihalomethanes**** 80 μg/l
Haloacetic Acids 5***** 60 μg/l
Synthetic Organic Compounds (SOCs) 2,4-D 70 μg/l
2,4,5-TP (Silvex) 50 μg/l
Alachlor 2 μg/l
Atrazine 3 μg/l
Benzo(a)pyrene 0.2 μg/l
Carbofuran 40 μg/l
Chlordane 2 μg/l
Dalapon 200 μg/l
Di(2-ethylhexyl)adipate 400 μg/l
Di(2-ethylhexyl)phthalate 6 μg/l
Dibromochloropropane (DBCP) 0.2 μg/l
Dinoseb 7 μg/l
Dioxin (2,3,7,8-TCDD) 3x10-5 μg/l
Diquat 20 μg/l
Endothall 100 μg/l
Endrin 2 μg/l
Ethylene Dibromide (EDB) 0.05 μg/l
Glyphosate 700 μg/l
Heptachlor 0.4 μg/l
Heptachlor epoxide 0.2 μg/l
Hexachlorobenzene 1 μg/l
Hexachlorocyclopentadiene 50 μg/l
Lindane 0.2 μg/l
Methoxychlor 40 μg/l
Oxamyl (Vydate) 200 μg/l
PCBs 0.5 μg/l
Pentachlorophenol 1 μg/l
Picloram 500 μg/l
Simazine 4 μg/l
Toxaphene 3 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.