(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.
|
(a) [Reserved]
(b) MCLGs for the following contaminants are as indicated:
| Contaminant
| MCLG (mg/l)
|
|---|
| Antimony | 0.006
|
| Arsenic | zero
1
|
| Asbestos | 7 Million fibers/liter (longer than 10 µm).
|
| Barium | 2
|
| Beryllium | .004
|
| Cadmium | 0.005
|
| Chromium | 0.1
|
| Copper | 1.3
|
| Cyanide (as free Cyanide) | .2
|
| Fluoride | 4.0
|
| Lead | zero
|
| Mercury | 0.002
|
| Nitrate | 10 (as Nitrogen).
|
| Nitrite | 1 (as Nitrogen).
|
| Total Nitrate + Nitrite | 10 (as Nitrogen).
|
| Selenium | 0.05
|
| Thallium | .0005
|
(a) MCLGs for the following contaminants are as indicated:
| Contaminant
| MCLG
|
|---|
| (1) Giardia lamblia | zero
|
| (2) Viruses | zero
|
| (3) Legionella | zero
|
| (4) Total coliforms (including fecal) | zero
|
| coliforms and Escherichia coli
| |
| (5) Cryptosporidium | zero
|
| (6) Escherichia coli (E. coli) | zero |
(b) The MCLG identified in paragraph (a)(4) of this section is applicable until March 31, 2016. The MCLG identified in paragraph (a)(6) of this section is applicable beginning April 1, 2016.
[78 FR 10347, Feb. 13, 2013]
MCLGs for the following disinfection byproducts are as indicated:
| Disinfection byproduct
| MCLG
(mg/L)
|
|---|
| Bromodichloromethane | zero
|
| Bromoform | zero
|
| Bromate | zero
|
| Chlorite | 0.8
|
| Chloroform | 0.07
|
| Dibromochloromethane | 0.06
|
| Dichloroacetic acid | zero
|
| Monochloroacetic acid | 0.07
|
| Trichloroacetic acid | 0.02 |
MRDLGs for disinfectants are as follows:
| Disinfectant residual
| MRDLG(mg/L)
|
|---|
| Chlorine | 4 (as Cl 2).
|
| Chloramines | 4 (as Cl 2).
|
| Chlorine dioxide | 0.8 (as ClO2) |
MCLGs for radionuclides are as indicated in the following table:
| Contaminant
| MCLG
|
|---|
| 1. Combined radium-226 and radium-228 | Zero.
|
| 2. Gross alpha particle activity (excluding radon and uranium) | Zero.
|
| 3. Beta particle and photon radioactivity | Zero.
|
| 4. Uranium | Zero. |