40 C.F.R. § 141.50
Maximum contaminant level goals for organic contaminants
(a) MCLGs are zero for the following contaminants:
(1) Benzene.
(2) Vinyl chloride.
(3) Carbon tetrachloride.
(4) 1,2-dichloroethane.
(5) Trichloroethylene.
(6) Acrylamide.
(7) Alachlor.
(8) Chlordane.
(9) Dibromochloropropane.
(10) 1,2-Dichloropropane.
(11) Epichlorohydrin.
(12) Ethylene dibromide.
(13) Heptachlor.
(14) Heptachlor epoxide.
(15) Pentachlorophenol.
(16) Polychlorinated biphenyls (PCBs).
(17) Tetrachloroethylene.
(18) Toxaphene.
(19) Benzo[a]pyrene.
(20) Dichloromethane (methylene chloride).
(21) Di(2-ethylhexyl)phthalate.
(22) Hexachlorobenzene.
(23) 2,3,7,8-TCDD (Dioxin).
(24) PFOA.
(25) PFOS.
(b) MCLGs for the following contaminants are as indicated:
| Contaminant | MCLG in mg/l (unless otherwise noted) |
|---|---|
| (1) 1,1-Dichloroethylene | 0.007 |
| (2) 1,1,1-Trichloroethane | 0.20 |
| (3) para-Dichlorobenzene | 0.075 |
| (4) Aldicarb | 0.001 |
| (5) Aldicarb sulfoxide | 0.001 |
| (6) Aldicarb sulfone | 0.001 |
| (7) Atrazine | 0.003 |
| (8) Carbofuran | 0.04 |
| (9) o-Dichlorobenzene | 0.6 |
| (10) cis-1,2-Dichloroethylene | 0.07 |
| (11) trans-1,2-Dichloroethylene | 0.1 |
| (12) 2,4-D | 0.07 |
| (13) Ethylbenzene | 0.7 |
| (14) Lindane | 0.0002 |
| (15) Methoxychlor | 0.04 |
| (16) Monochlorobenzene | 0.1 |
| (17) Styrene | 0.1 |
| (18) Toluene | 1 |
| (19) 2,4,5-TP | 0.05 |
| (20) Xylenes (total) | 10 |
| (21) Dalapon | 0.2 |
| (22) Di(2-ethylhexyl)adipate | .4 |
| (23) Dinoseb | .007 |
| (24) Diquat | .02 |
| (25) Endothall | .1 |
| (26) Endrin | .002 |
| (27) Glyphosate | .7 |
| (28) Hexachlorocyclopentadiene | .05 |
| (29) Oxamyl (Vydate) | .2 |
| (30) Picloram | .5 |
| (31) Simazine | .004 |
| (32) 1,2,4-Trichlorobenzene | .07 |
| (33) 1,1,2-Trichloroethane | .003 |
| (34) Hazard Index PFAS (HFPO-DA, PFBS, PFHxS, and PFNA) | 1 (unitless).1 |
| (35) HFPO-DA | 0.00001. |
| (36) PFHxS | 0.00001. |
| (37) PFNA | 0.00001. |
| 1 The PFAS Mixture Hazard Index (HI) is the sum of component hazard quotients (HQs), which are calculated by dividing the measured component PFAS concentration in water by the corresponding contaminant's health-based water concentration (HBWC) when expressed in the same units (shown in ng/l). The HBWC for PFHxS is 10 ng/l; the HBWC for HFPO-DA is 10 ng/l; the HBWC for PFNA is 10 ng/l; and the HBWC for PFBS is 2000 ng/l. A PFAS Mixture Hazard Index greater than 1 (unitless) indicates an exceedance of the health protective level and indicates potential human health risk from the PFAS mixture in drinking water. | |
Notes of Decisions
Cited in 3
cases (1 in the last 5 years), 1996–2025 · leading case: City of Greenville v. Syngenta Crop Prot., Inc., 756 F. Supp. 2d 1001 (S.D. Ill. 2010).
City of Greenville v. Syngenta Crop Prot., Inc., 756 F. Supp. 2d 1001 (S.D. Ill. 2010). “See 40 C.F.R. § 141.50 (b). The best available technology to remove atrazine from raw water is a granular activated carbon (“GAC”) filtration system.”
Davis v. Sun Oil Co., 929 F. Supp. 1077 (S.D. Ohio 1996). “40 C.F.R. § 141.50 (a)(1). However, this Court notes that the term “maximum containment level goal” is defined as “the maximum level of a contaminant in drinking water at which no known or anticipated adverse effect on the health of persons would occur, and which allows an…”
Lazy S Ranch Props., LLC v. Valero Terminaling & Distrib. (E.D. Okla. 2025). “See 40 C.F.R. § 141.50 (1994). Moreover, this borehole is located to the west of the Wynnewood Pipeline, immediately adjacent to the former Blue Knight Pipeline, and almost half the distance between the Wynnewood Pipeline and Tulip Springs.”
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