Ill. Admin. Code tit. 35, § 620.410 - Groundwater Quality Standards for Class I: Potable Resource Groundwater
Except due to natural causes or as provided in Section 620.450, concentrations of the following chemical constituents must not be exceeded in Class I groundwater:
Constituent |
Units |
Standard |
Antimony |
mg/L |
0.006 |
Arsenic* |
mg/L |
0.010 |
Barium |
mg/L |
2.0 |
Beryllium |
mg/L |
0.004 |
Boron |
mg/L |
2.0 |
Cadmium |
mg/L |
0.005 |
Chloride |
mg/L |
200.0 |
Chromium |
mg/L |
0.1 |
Cobalt |
mg/L |
1.0 |
Copper |
mg/L |
0.65 |
Cyanide |
mg/L |
0.2 |
Fluoride |
mg/L |
4.0 |
Iron |
mg/L |
5.0 |
Lead |
mg/L |
0.0075 |
Manganese |
mg/L |
0.15 |
Mercury |
mg/L |
0.002 |
Nickel |
mg/L |
0.1 |
Nitrate as N |
mg/L |
10.0 |
Perchlorate |
mg/L |
0.0049 |
Radium-226 |
pCi/l |
20.0 |
Radium-228 |
pCi/l |
20.0 |
Selenium |
mg/L |
0.05 |
Silver |
mg/L |
0.05 |
Sulfate |
mg/L |
400.0 |
Thallium |
mg/L |
0.002 |
Total Dissolved |
||
Solids (TDS) |
mg/L |
1,200 |
Vanadium |
mg/L |
0.049 |
Zinc |
mg/L |
5.0 |
*Denotes a carcinogen.
Except due to natural causes or as provided in Section 620.450 or subsection (d), concentrations of the following organic chemical constituents shall not be exceeded in Class I groundwater:
Constituent |
Standard (mg/L) |
Acenaphthene |
0.42 |
Acetone |
6.3 |
Alachlor* |
0.002 |
Aldicarb |
0.003 |
Anthracene |
2.1 |
Atrazine |
0.003 |
Benzene* |
0.005 |
Benzo(a)anthracene* |
0.00013 |
Benzo(b)fluoranthene* |
0.00018 |
Benzo(k)fluoranthene* |
0.00017 |
Benzo(a)pyrene* |
0.0002 |
Benzoic acid |
28.0 |
2-Butanone (MEK) |
4.2 |
Carbofuran |
0.04 |
Carbon Disulfide |
0.7 |
Carbon Tetrachloride* |
0.005 |
Chlordane* |
0.002 |
Chloroform* |
0.07 |
Chrysene* |
0.012 |
Dalapon |
0.2 |
Dibenzo(a,h)anthracene* |
0.0003 |
Dicamba |
0.21 |
Dichlorodifluoromethane |
1.4 |
1,1-Dichloroethane |
1.4 |
Dichloromethane* |
0.005 |
Di(2-ethylhexyl)phthalate* |
0.006 |
Diethyl Phthalate |
5.6 |
Di-n-butyl Phthalate |
0.7 |
Dinoseb |
0.007 |
Endothall |
0.1 |
Endrin |
0.002 |
Ethylene Dibromide* |
0.00005 |
Fluoranthene |
0.28 |
Fluorene |
0.28 |
Heptachlor* |
0.0004 |
Heptachlor Epoxide* |
0.0002 |
Hexachlorocyclopentadiene |
0.05 |
Indeno(1,2,3-cd)pyrene* |
0.00043 |
Isopropylbenzene (Cumene) |
0.7 |
Lindane (Gamma-Hexachlorocyclohexane) |
0.0002 |
2,4-D |
0.07 |
ortho-Dichlorobenzene |
0.6 |
para-Dichlorobenzene |
0.075 |
1,2-Dibromo-3-Chloropropane* |
0.0002 |
1,2-Dichloroethane* |
0.005 |
1,1-Dichloroethylene |
0.007 |
cis-1,2-Dichloroethylene |
0.07 |
trans-1,2-Dichloroethylene |
0.1 |
1,2-Dichloropropane* |
0.005 |
Ethylbenzene |
0.7 |
MCPP (Mecoprop) |
0.007 |
Methoxychlor |
0.04 |
2-Methylnaphthalene |
0.028 |
2-Methylphenol |
0.35 |
Methyl Tertiary-Butyl Ether (MTBE) |
0.07 |
Monochlorobenzene |
0.1 |
Naphthalene |
0.14 |
P-Dioxane* |
0.0077 |
Pentachlorophenol* |
0.001 |
Phenols |
0.1 |
Picloram |
0.5 |
Pyrene |
0.21 |
Polychlorinated |
|
Biphenyls (PCBs) (as decachloro-biphenyl)* |
0.0005 |
alpha-BHC (alpha-Benzene hexachloride)* |
0.00011 |
Simazine |
0.004 |
Styrene |
0.1 |
2,4,5-TP (Silvex) |
0.05 |
Tetrachloroethylene* |
0.005 |
Toluene |
1.0 |
Toxaphene* |
0.003 |
1,1,1-Trichloroethane |
0.2 |
1,1,2-Trichloroethane |
0.005 |
1,2,4-Trichlorobenzene |
0.07 |
Trichloroethylene* |
0.005 |
Trichlorofluoromethane |
2.1 |
Vinyl Chloride* |
0.002 |
Xylenes |
10.0 |
*Denotes a carcinogen. |
Concentrations of the following explosive constituents must not exceed the Class I groundwater standard:
Constituent |
Standard (mg/L) |
1,3-Dinitrobenzene |
0.0007 |
2,4-Dinitrotoluene* |
0.0001 |
2,6-Dinitrotoluene* |
0.00031 |
HMX (High Melting Explosive, Octogen) |
1.4 |
Nitrobenzene |
0.014 |
RDX (Royal Demolition Explosive, Cyclonite) |
0.084 |
1,3,5-Trinitrobenzene |
0.84 |
2,4,6-Trinitrotoluene (TNT) |
0.014 |
*Denotes a carcinogen. |
Concentrations of the following chemical constituents of gasoline, diesel fuel, or heating fuel must not be exceeded in Class I groundwater:
Constituent |
Standard (mg/L) |
Benzene* |
0.005 |
BETX |
11.705 |
*Denotes a carcinogen. |
Except due to natural causes, a pH range of 6.5 - 9.0 units must not be exceeded in Class I groundwater.
Critical |
Standard |
||
Constituent |
Organ |
(pCi/L) |
|
Tritium |
Total body |
20,000.0 |
|
Strontium-90 |
Bone marrow |
8.0 |
|
Notes
Amended at 36 Ill. Reg. 15206, effective October 5, 2012
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.