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Title 40

Displaying title 40, up to date as of 9/22/2021. Title 40 was last amended 9/22/2021.

Title 40

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§ 141.61 Maximum contaminant levels for organic contaminants.

(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]