§ 141.61 - Maximum contaminant levels for organic contaminants.

§ 141.61 Maximum contaminant levels for organic contaminants.

Cross Reference

Link to an amendment published at 89 FR 32744, Apr. 26, 2024.

(a) The following maximum contaminant levels for organic contaminants apply to community and non-transient, non-community water systems.

CAS No.	Contaminant	MCL (mg/l)
(1) 75-01-4	Vinyl chloride	0.002
(2) 71-43-2	Benzene	0.005
(3) 56-23-5	Carbon tetrachloride	0.005
(4) 107-06-2	1,2-Dichloroethane	0.005
(5) 79-01-6	Trichloroethylene	0.005
(6) 106-46-7	para-Dichlorobenzene	0.075
(7) 75-35-4	1,1-Dichloroethylene	0.007
(8) 71-55-6	1,1,1-Trichloroethane	0.2
(9) 156-59-2	cis-1,2-Dichloroethylene	0.07
(10) 78-87-5	1,2-Dichloropropane	0.005
(11) 100-41-4	Ethylbenzene	0.7
(12) 108-90-7	Monochlorobenzene	0.1
(13) 95-50-1	o-Dichlorobenzene	0.6
(14) 100-42-5	Styrene	0.1
(15) 127-18-4	Tetrachloroethylene	0.005
(16) 108-88-3	Toluene	1
(17) 156-60-5	trans-1,2-Dichloroethylene	0.1
(18) 1330-20-7	Xylenes (total)	10
(19) 75-09-2	Dichloromethane	0.005
(20) 120-82-1	1,2,4-Trichloro- benzene	.07
(21) 79-00-5	1,1,2-Trichloro- ethane	.005

(b) The Administrator, pursuant to section 1412 of the Act, hereby identifies as indicated in the Table below granular activated carbon (GAC), packed tower aeration (PTA), or oxidation (OX) as the best technology treatment technique, or other means available for achieving compliance with the maximum contaminant level for organic contaminants identified in paragraphs (a) and (c) of this section:

BAT for Organic Contaminants Listed in § 141.61 (a) and (c)

CAS No.	Contaminant	GAC	PTA	OX
15972-60-8	Alachlor	X
116-06-3	Aldicarb	X
1646-88-4	Aldicarb sulfone	X
1646-87-3	Aldicarb sulfoxide	X
1912-24-9	Atrazine	X
71-43-2	Benzene	X	X
50-32-8	Benzo[a]pyrene	X
1563-66-2	Carbofuran	X
56-23-5	Carbon tetrachloride	X	X
57-74-9	Chlordane	X
75-99-0	Dalapon	X
94-75-7	2,4-D	X
103-23-1	Di (2-ethylhexyl) adipate	X	X
117-81-7	Di (2-ethylhexyl) phthalate	X
96-12-8	Dibromochloropropane (DBCP)	X	X
95-50-1	o-Dichlorobenzene	X	X
106-46-7	para-Dichlorobenzene	X	X
107-06-2	1,2-Dichloroethane	X	X
75-35-4	1,1-Dichloroethylene	X	X
156-59-2	cis-1,2-Dichloroethylene	X	X
156-60-5	trans-1,2-Dichloroethylene	X	X
75-09-2	Dichloromethane		X
78-87-5	1,2-Dichloropropane	X	X
88-85-7	Dinoseb	X
85-00-7	Diquat	X
145-73-3	Endothall	X
72-20-8	Endrin	X
100-41-4	Ethylbenzene	X	X
106-93-4	Ethylene Dibromide (EDB)	X	X
1071-83-6	Gylphosate			X
76-44-8	Heptachlor	X
1024-57-3	Heptachlor epoxide	X
118-74-1	Hexachlorobenzene	X
77-47-3	Hexachlorocyclopentadiene	X	X
58-89-9	Lindane	X
72-43-5	Methoxychlor	X
108-90-7	Monochlorobenzene	X	X
23135-22-0	Oxamyl (Vydate)	X
87-86-5	Pentachlorophenol	X
1918-02-1	Picloram	X
1336-36-3	Polychlorinated biphenyls (PCB)	X
122-34-9	Simazine	X
100-42-5	Styrene	X	X
1746-01-6	2,3,7,8-TCDD (Dioxin)	X
127-18-4	Tetrachloroethylene	X	X
108-88-3	Toluene	X	X
8001-35-2	Toxaphene	X
93-72-1	2,4,5-TP (Silvex)	X
120-82-1	1,2,4-Trichlorobenzene	X	X
71-55-6	1,1,1-Trichloroethane	X	X
79-00-5	1,1,2-Trichloroethane	X	X
79-01-6	Trichloroethylene	X	X
75-01-4	Vinyl chloride		X
1330-20-7	Xylene	X	X

(c) The following maximum contaminant levels for synthetic organic contaminants apply to community water systems and non-transient, non-community water systems:

CAS No.	Contaminant	MCL (mg/l)
(1) 15972-60-8	Alachlor	0.002
(2) 116-06-3	Aldicarb	0.003
(3) 1646-87-3	Aldicarb sulfoxide	0.004
(4) 1646-87-4	Aldicarb sulfone	0.002
(5) 1912-24-9	Atrazine	0.003
(6) 1563-66-2	Carbofuran	0.04
(7) 57-74-9	Chlordane	0.002
(8) 96-12-8	Dibromochloropropane	0.0002
(9) 94-75-7	2,4-D	0.07
(10) 106-93-4	Ethylene dibromide	0.00005
(11) 76-44-8	Heptachlor	0.0004
(12) 1024-57-3	Heptachlor epoxide	0.0002
(13) 58-89-9	Lindane	0.0002
(14) 72-43-5	Methoxychlor	0.04
(15) 1336-36-3	Polychlorinated biphenyls	0.0005
(16) 87-86-5	Pentachlorophenol	0.001
(17) 8001-35-2	Toxaphene	0.003
(18) 93-72-1	2,4,5-TP	0.05
(19) 50-32-8	Benzo[a]pyrene	0.0002
(20) 75-99-0	Dalapon	0.2
(21) 103-23-1	Di(2-ethylhexyl) adipate	0.4
(22) 117-81-7	Di(2-ethylhexyl) phthalate	0.006
(23) 88-85-7	Dinoseb	0.007
(24) 85-00-7	Diquat	0.02
(25) 145-73-3	Endothall	0.1
(26) 72-20-8	Endrin	0.002
(27) 1071-53-6	Glyphosate	0.7
(28) 118-74-1	Hexacholorbenzene	0.001
(29) 77-47-4	Hexachlorocyclopentadiene	0.05
(30) 23135-22-0	Oxamyl (Vydate)	0.2
(31) 1918-02-1	Picloram	0.5
(32) 122-34-9	Simazine	0.004
(33) 1746-01-6	2,3,7,8-TCDD (Dioxin)	3 × 10−8

[56 FR 3593, Jan. 30, 1991, as amended at 56 FR 30280, July 1, 1991; 57 FR 31846, July 17, 1992; 59 FR 34324, July 1, 1994]