Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 611 - PRIMARY DRINKING WATER STANDARDS › Subpart F - MAXIMUM CONTAMINANT LEVELS (MCLs) AND MAXIMUM RESIDUAL DISINFECTANT LEVELS (MRDLs) › Section 611.311 - Revised MCLs for Organic Chemical Contaminants

Current through Register Vol. 48, No. 28, July 12, 2024
a) Volatile Organic Chemical Contaminants.
				The MCLs for VOCs apply to CWS suppliers and NTNCWS suppliers:
CAS No.
Contaminant
MCL (mg/L)
71-43-2
Benzene
0.005
56-23-5
Carbon tetrachloride
0.005
95-50-1
o-Dichlorobenzene
0.6
106-46-7
p-Dichlorobenzene
0.075
107-06-2
1,2-Dichloroethane
0.005
75-35-4
1,1-Dichloroethylene
0.007
156-59-2
cis-1,2-Dichloroethylene
0.07
156-60-5
trans-1,2-Dichloroethylene
0.1
75-09-2
Dichloromethane (methylene chloride)
0.005
78-87-5
1,2-Dichloropropane
0.005
100-41-4
Ethylbenzene
0.7
108-90-7
Monochlorobenzene
0.1
100-42-5
Styrene
0.1
127-18-4
Tetrachloroethylene
0.005
108-88-3
Toluene
1
120-82-1
1,2,4-Trichlorobenzene
0.07
71-55-6
1,1,1-Trichloroethane
0.2
79-00-5
1,1,2-Trichloroethane
0.005
79-01-6
Trichloroethylene
0.005
75-01-4
Vinyl chloride
0.002
1330-20-7
Xylenes (total)
10
b)
				USEPA identifies granular activated carbon (GAC), packed tower aeration (PTA),
				or oxidation (OX) as BAT for achieving compliance with the MCLs for VOCs and
				SOCs in subsections (a) and (c), as indicated:
CAS No.
Contaminant
MCL (mg/L)
15972-60-8
Alachlor
GAC
116-06-3
Aldicarb*
GAC
1646-87-4
Aldicarb sulfone*
GAC
1646-87-3
Aldicarb sulfoxide*
GAC
1912-24-9
Atrazine
GAC
71-43-2
Benzene
GAC, PTA
50-32-8
Benzo(a)pyrene
GAC
1563-66-2
Carbofuran
GAC
56-23-5
Carbon tetrachloride
GAC, PTA
57-74-9
Chlordane
GAC
94-75-7
2,4-D
GAC
75-99-0
Dalapon
GAC
96-12-8
Dibromochloropropane
GAC, PTA
95-50-1
o-Dichlorobenzene
GAC, PTA
106-46-7
p-Dichlorobenzene
GAC, PTA
107-06-2
1,2-Dichloroethane
GAC, PTA
156-59-2
cis-1,2-Dichloroethylene
GAC, PTA
156-60-5
trans-1,2-Dichoroethylene
GAC, PTA
75-35-4
1,1-Dichloroethylene
GAC, PTA
75-09-2
Dichloromethane
PTA
78-87-5
1,2-Dichloropropane
GAC, PTA
103-23-1
Di(2-ethylhexyl)adipate
GAC, PTA
117-81-7
Di(2-ethylhexyl)phthalate
GAC
88-85-7
Dinoseb
GAC
85-00-7
Diquat
GAC
145-73-3
Endothall
GAC
72-20-8
Endrin
GAC
106-93-4
Ethylene dibromide (EDB)
GAC, PTA
100-41-4
Ethylbenzene
GAC, PTA
1071-53-6
Glyphosate
OX
76-44-8
Heptachlor
GAC
1024-57-3
Heptachlor epoxide
GAC
118-74-1
Hexachlorobenzene
GAC
77-47-3
Hexachlorocyclopentadiene
GAC, PTA
58-89-9
Lindane
GAC
72-43-5
Methoxychlor
GAC
108-90-7
Monochlorobenzene
GAC, PTA
23135-22-0
Oxamyl
GAC
87-86-5
Pentachlorophenol
GAC
1918-02-1
Picloram
GAC
1336-36-3
Polychlorinated biphenyls (PCB)
GAC
122-34-9
Simazine
GAC
100-42-5
Styrene
GAC, PTA
1746-01-6
2,3,7,8-TCDD
GAC
127-18-4
Tetrachloroethylene
GAC, PTA
108-88-3
Toluene
GAC
8001-35-2
Toxaphene
GAC
120-82-1
1,2,4-trichlorobenzene
GAC, PTA
71-55-6
1,1,1-Trichloroethane
GAC, PTA
79-00-5
1,1,2-trichloroethane
GAC, PTA
79-01-6
Trichloroethylene
GAC, PTA
93-72-1
2,4,5-TP
GAC
75-01-4
Vinyl chloride
PTA
1330-20-7
Xylene
GAC, PTA
*See the Board note at the end of this Section.
c) Synthetic Organic Chemical
				Contaminants. MCLs for SOCs apply to CWS and NTNCWS suppliers:
CAS Number
Contaminant
MCL (mg/L)
15972-60-8
Alachlor
0.002
116-06-3
Aldicarb*
0.002
1646-87-4
Aldicarb sulfone*
0.002
1646-87-3
Aldicarb sulfoxide*
0.004
1912-24-9
Atrazine
0.003
50-32-8
Benzo(a)pyrene
0.0002
1563-66-2
Carbofuran
0.04
57-74-9
Chlordane
0.002
94-75-7
2,4-D
0.07
75-99-0
Dalapon
0.2
96-12-8
Dibromochloropropane
0.0002
103-23-1
Di(2-ethylhexyl)adipate
0.4
117-81-7
Di(2-ethylhexyl)phthalate
0.006
88-85-7
Dinoseb
0.007
85-00-7
Diquat
0.02
145-73-3
Endothall
0.1
72-20-8
Endrin
0.002
106-93-4
Ethylene dibromide
0.00005
1071-53-6
Glyphosate
0.7
76-44-8
Heptachlor
0.0004
1024-57-3
Heptachlor epoxide
0.0002
118-74-1
Hexachlorobenzene
0.001
77-47-4
Hexachlorocyclopentadiene
0.05
58-89-9
Lindane
0.0002
72-43-5
Methoxychlor
0.04
23135-22-0
Oxamyl (Vydate)
0.2
87-86-5
Pentachlorophenol
0.001
1918-02-1
Picloram
0.5
1336-36-3
Polychlorinated biphenyls (PCBs)
0.0005
122-34-9
Simazine
0.004
1746-01-6
2,3,7,8-TCDD (Dioxin)
0.00000003
8001-35-2
Toxaphene
0.003
93-72-1
2,4,5-TP
0.05
* See the Board note at the end of this Section.
BOARD NOTE: This Section derives from
					 40 CFR
					 141.61. More stringent state MCLs for 2,4-D,
					 heptachlor, and heptachlor epoxide appear at Section
					 611.310. In
					 40 CFR
					 141.6(g), USEPA postponed
					 the effectiveness of the MCLs for aldicarb, aldicarb sulfone, and aldicarb
					 sulfoxide until it took further action on those MCLs. See
					 40 CFR
					 141.6(g) and
					 57 Fed. Reg. 22178 (May 27, 1992).
					 USEPA later stated that it anticipated taking no action until 2005 on a federal
					 national primary drinking water regulation (NPDWR) applicable to the aldicarbs.
					 68 Fed. Reg. 31108 (May 27, 2003). In 2005, USEPA indicated no projected date
					 for final action on the aldicarbs. See 70 Fed. Reg. 27501, 671 (May 16, 2005).
					 An entry for the aldicarbs last appeared in USEPA's Spring 2007 semiannual
					 regulatory agenda, indicating no projected dates for further action. See 72
					 Fed. Reg. 23156, 97 (Apr. 30, 2007); see also 72 Fed. Reg. 70118, 23 (Dec. 10,
					 2007) (the first USEPA regulatory agenda that included no entry for the
					 aldicarbs). As of early 2022, USEPA did not include the aldicarbs among the
					 NPDWRs on its webpage. USEPA, Ground Water and Drinking Water, National Primary
					 Drinking Water Regulations (
www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations
;
					 accessed February 16, 2022). While the Board must maintain entries for
					 aldicarb, aldicarb sulfoxide, and aldicarb sulfone to maintain consistency with
					 the literal text of the federal rules (see Sections
					 7.2 and
					 17.5 of the Act;
					 42 U.S.C.
					 300g-2;
					 40 CFR
					 142.10), the Board intends that no aldicarb
					 requirements apply in Illinois until after USEPA adopts such requirements, and
					 the Board removes this statement.