Home
gpo.gov
govinfo.gov

e-CFR Navigation Aids

Browse

Simple Search

Advanced Search

 — Boolean

 — Proximity

 

Search History

Search Tips

Corrections

Latest Updates

User Info

FAQs

Agency List

Incorporation By Reference

eCFR logo

Related Resources

Electronic Code of Federal Regulations

We invite you to try out our new beta eCFR site at https://ecfr.federalregister.gov. We have made big changes to make the eCFR easier to use. Be sure to leave feedback using the Feedback button on the bottom right of each page!

e-CFR data is current as of January 14, 2021

Title 40Chapter ISubchapter DPart 141Subpart G → §141.61


Title 40: Protection of Environment
PART 141—NATIONAL PRIMARY DRINKING WATER REGULATIONS
Subpart G—National Primary Drinking Water Regulations: Maximum Contaminant Levels and Maximum Residual Disinfectant Levels


§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.ContaminantMCL (mg/l)
  (1)  75-01-4Vinyl chloride0.002
  (2)  71-43-2Benzene0.005
  (3)  56-23-5Carbon tetrachloride0.005
  (4)  107-06-21,2-Dichloroethane0.005
  (5)  79-01-6Trichloroethylene0.005
  (6)  106-46-7para-Dichlorobenzene0.075
  (7)  75-35-41,1-Dichloroethylene0.007
  (8)  71-55-61,1,1-Trichloroethane0.2
  (9)  156-59-2cis-1,2-Dichloroethylene0.07
  (10)  78-87-51,2-Dichloropropane0.005
  (11)  100-41-4Ethylbenzene0.7
  (12)  108-90-7Monochlorobenzene0.1
  (13)  95-50-1o-Dichlorobenzene0.6
  (14)  100-42-5Styrene0.1
  (15)  127-18-4Tetrachloroethylene0.005
  (16)  108-88-3Toluene1
  (17)  156-60-5trans-1,2-Dichloroethylene0.1
  (18)  1330-20-7Xylenes (total)10
  (19)  75-09-2Dichloromethane0.005
  (20)  120-82-11,2,4-Trichloro- benzene.07
  (21)  79-00-51,1,2-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.ContaminantGACPTAOX
15972-60-8AlachlorX
116-06-3AldicarbX
1646-88-4Aldicarb sulfoneX
1646-87-3Aldicarb sulfoxideX
1912-24-9AtrazineX
71-43-2BenzeneXX
50-32-8Benzo[a]pyreneX
1563-66-2CarbofuranX
56-23-5Carbon tetrachlorideXX
57-74-9ChlordaneX
75-99-0DalaponX
94-75-72,4-DX
103-23-1Di (2-ethylhexyl) adipateXX
117-81-7Di (2-ethylhexyl) phthalateX
96-12-8Dibromochloropropane (DBCP)XX
95-50-1o-DichlorobenzeneXX
106-46-7para-DichlorobenzeneXX
107-06-21,2-DichloroethaneXX
75-35-41,1-DichloroethyleneXX
156-59-2cis-1,2-DichloroethyleneXX
156-60-5trans-1,2-DichloroethyleneXX
75-09-2DichloromethaneX
78-87-51,2-DichloropropaneXX
88-85-7DinosebX
85-00-7DiquatX
145-73-3EndothallX
72-20-8EndrinX
100-41-4EthylbenzeneXX
106-93-4Ethylene Dibromide (EDB)XX
1071-83-6GylphosateX
76-44-8HeptachlorX
1024-57-3Heptachlor epoxideX
118-74-1HexachlorobenzeneX
77-47-3HexachlorocyclopentadieneXX
58-89-9LindaneX
72-43-5MethoxychlorX
108-90-7MonochlorobenzeneXX
23135-22-0Oxamyl (Vydate)X
87-86-5PentachlorophenolX
1918-02-1PicloramX
1336-36-3Polychlorinated biphenyls (PCB)X
122-34-9SimazineX
100-42-5StyreneXX
1746-01-62,3,7,8-TCDD (Dioxin)X
127-18-4TetrachloroethyleneXX
108-88-3TolueneXX
8001-35-2ToxapheneX
93-72-12,4,5-TP (Silvex)X
120-82-11,2,4-TrichlorobenzeneXX
71-55-61,1,1-TrichloroethaneXX
79-00-51,1,2-TrichloroethaneXX
79-01-6TrichloroethyleneXX
75-01-4Vinyl chlorideX
1330-20-7XyleneXX

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

CAS No.ContaminantMCL (mg/l)
  (1)  15972-60-8Alachlor0.002
  (2) 116-06-3Aldicarb0.003
  (3) 1646-87-3Aldicarb sulfoxide0.004
  (4) 1646-87-4Aldicarb sulfone0.002
  (5)  1912-24-9Atrazine0.003
  (6)  1563-66-2Carbofuran0.04
  (7)  57-74-9Chlordane0.002
  (8)  96-12-8Dibromochloropropane0.0002
  (9)  94-75-72,4-D0.07
(10)  106-93-4Ethylene dibromide0.00005
(11)  76-44-8Heptachlor0.0004
(12)  1024-57-3Heptachlor epoxide0.0002
(13)  58-89-9Lindane0.0002
(14)  72-43-5Methoxychlor0.04
(15)  1336-36-3Polychlorinated biphenyls0.0005
(16)  87-86-5Pentachlorophenol0.001
(17)  8001-35-2Toxaphene0.003
(18)  93-72-12,4,5-TP0.05
(19)  50-32-8Benzo[a]pyrene0.0002
(20)  75-99-0Dalapon0.2
(21)  103-23-1Di(2-ethylhexyl) adipate0.4
(22)  117-81-7Di(2-ethylhexyl) phthalate0.006
(23)  88-85-7Dinoseb0.007
(24)  85-00-7Diquat0.02
(25)  145-73-3Endothall0.1
(26)  72-20-8Endrin0.002
(27)  1071-53-6Glyphosate0.7
(28)  118-74-1Hexacholorbenzene0.001
(29)  77-47-4Hexachlorocyclopentadiene0.05
(30)  23135-22-0Oxamyl (Vydate)0.2
(31)  1918-02-1Picloram0.5
(32)  122-34-9Simazine0.004
(33)  1746-01-62,3,7,8-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]

Need assistance?