Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 620 - GROUNDWATER QUALITY › Subpart D - GROUNDWATER QUALITY STANDARDS › Section 620.410 - Groundwater Quality Standards for Class I: Potable Resource Groundwater

Current through Register Vol. 48, No. 28, July 12, 2024
a) Inorganic
				Chemical Constituents
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.
b) Organic Chemical Constituents
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.
c)
				Explosive Constituents
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.
d)
				Complex Organic Chemical Mixtures
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.
e)
				pH
Except due to natural causes, a pH range of 6.5 - 9.0 units
				  must not be exceeded in Class I groundwater.
f) Beta Particle and Photon Radioactivity
1) Except due to natural causes, the average
				annual concentration of beta particle and photon radioactivity from man-made
				radionuclides shall not exceed a dose equivalent to the total body organ
				greater than 4 mrem/year in Class I groundwater. If two or more radionuclides
				are present, the sum of their dose equivalent to the total body, or to any
				internal organ shall not exceed 4 mrem/year in Class I groundwater except due
				to natural causes.
2) Except for
				the radionuclides listed in subsection (f)(3), the concentration of man-made
				radionuclides causing 4 mrem total body or organ dose equivalent must be
				calculated on the basis of a 2 liter per day drinking water intake using the
				168-hour data in accordance with the procedure set forth in NCRP Report Number
				22, incorporated by reference at Section
				620.125(a).
3) Except due to natural causes, the average
				annual concentration assumed to produce a total body or organ dose of 4
				mrem/year of the following chemical constituents shall 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