Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 1 - WYOMING SURFACE WATER QUALITY STANDARDS › Appendix B - Water Quality Criteria[1]

Current through July 13, 2024
(a) Priority Pollutants.
Aquatic Life
Human Health Consumption of
Priority Pollutant
Acute Value (µg/L)
Chronic Value (µg/L)
Fish and Drinking Water(2)
							 (µg/L)
Fish(8)
							 (µg/L)
Acenaphthene
20(7)
990
Acrolein
3
3
6
9
Acrylonitrile
0.051(3)
0.25(3)
Benzene
2.2(3)
(3)
51
Benzidine
0.000086(3)
0.00020(3)
Carbon tetrachloride (Tetrachloromethane)
0.23(3)
1.6(3)
Chlorobenzene (Monochlorobenzene)
20(7)
1,600
1,2,4-Trichlorobenzene
35
70
Hexachlorobenzene
0.00028(3)
0.00029(3)
1,2-Dichloroethane
0.38(3)
37(3)
1,1,1-Trichloroethane
200(9)
Hexachloroethane
1.4(3)
3.3(3)
1,1,2-Trichloroethane
0.59(3)
(3)
16
1,1,2,2-Tetrachloroethane
0.17(3)
4(3)
Bis(2-chloroethyl) ether
0.030(3)
0.53(3)
2-Chloronaphthalene
1,000
1,600
2,4,6-Trichlorophenol
1.4(3)
2.4(3)
4-Chloro-3-methylphenol (3-Methyl-4-chlorophenol)
							 (p-Chloro-m-cresol)
3,000(7)
Chloroform
(Trichloromethane)
5.7(3)
470(3)
2-Chlorophenol
0.1(7)
150
1,2-Dichlorobenzene
420
1,300
1,3-Dichlorobenzene
320
960
1,4-Dichlorobenzene
63
190
3,3'-Dichlorobenzidine
0.021(3)
0.028(3)
1,1-Dichloroethylene
7(9)
7,100
1,2-trans-Dichloroethylene
100(9)
10,000
2,4-Dichlorophenol
0.3(7)
290
1,2-Dichloropropane
0.50(3)
15(3)
1,3-Dichloropropene
(1,3-Dichloropropylene) (cis and trans
							 isomers)
0.34(3)
21(3)
2,4-Dimethylphenol
380
850
2,4-Dinitrotoluene
0.11(3)
3.4(3)
1,2-Diphenylhydrazine
0.036(3)
0.20(3)
Ethylbenzene
530
2,100
Fluoranthene
130
140
Bis(2-chloroisopropyl) ether
1,400
65,000
Methylene chloride (Dichloromethane)
4.6(3)
590(3)
Methyl bromide
(Bromomethane)
47
1,500
Bromoform
(Tribromomethane)
4.3(3)
140(3)
Dichlorobromomethane
0.55(3)
17(3)
Chlorodibromomethane
0.40(3)
13(3)
Hexachlorobutadiene
0.44(3)
18(3)
Hexachlorocyclopentadiene
1(7)
1,100
Isophorone
35(3)
960(3)
Nitrobenzene
17
690
2,4-Dinitrophenol
69
5,300
4,6-Dinitro-2-methylphenol
							 (2-Methyl-4,6-dinitrophenol) (4,6-Dinitro-o-cresol)
13
280
N-Nitrosodimethylamine
0.00069(3)
3(3)
N-Nitrosodiphenylamine
3.3(3)
6(3)
N-Nitrosodi-n-propylamine
0.005(3)
0.51(3)
Pentachlorophenol
19(5)
15(5)
0. 27(3)
3(3)
Phenol
300(7)
860,000
Bis(2-ethylhexyl) phthalate
1.2(3)
2.2(3)
Butylbenzyl phthalate
1,500
1,900
Di-n-butyl phthalate
2,000
4,500
Diethyl phthalate
17,000
44,000
Dimethyl phthalate
270,000
1,100,000
Benzo(a)anthracene(1,2-Benzanthracene)
0.0038(3)
0.018(3)
Benzo(a)pyrene (3,4-Benzopyrene)
0.0038(3)
0.018(3)
Benzo(b)fluoranthene
(3,4-Benzofluoranthene)
0.0038(3)
0.018(3)
Benzo(k)fluoranthene
(11,1 2-Benzofluoranthene)
0.0038(3)
0.018(3)
Chrysene
0.0038(3)
0.018(3)
Anthracene
8,300
40,000
Fluorene
1,100
5,300
Dibenzo(a,h)anthracene(1,2
							 ,5,6-Dibenzanthracene)
0.0038(3)
0.018(3)
Indeno(1,2,3-cd)pyrene
0.0038(3)
0.018(3)
Pyrene
830
4,000
Tetrachloroethylene
0.69(3)
3.3(3)
Toluene
1,000(9)
15,000
Trichloroethylene
2.5(3)
30(3)
Vinyl chloride
(Chloroethylene)
0.025(3)
2.4(3)
Aldrin
1.5(16)
0.000049(3)
0.000050(3)
Dieldrin
0.24
0.056
0.000052(3)
0.000054(3)
Chlordane
1.2(16)
0.0043
0.00080(3)
0.00081(3)
4,4'-DDT
0.55(16)
0.001
0.00022(3)
0.00022(3)
4,4'-DDE
0.00022(3)
0.00022(3)
4,4'-DDD
0.00031(3)
0.00031(3)
alpha-Endosulfan
0.11(16)
0.056
62
89
beta-Endosulfan
0.11(16)
0.056
62
89
Endosulfan sulfate
62
89
Endrin
0.086
0.036
0.059
0.060
Endrin aldehyde
0.29
0.30
Heptachlor
0.26(16)
0.0038
0.000079(3)
0.000079(3)
Heptachlor epoxide
0.26(16)
0.0038
0.000039(3)
0.000039(3)
alpha-BHC
(Hexachlorocyclohexane-alpha)
0.0026(3)
0.0049(3)
beta-BHC
(Hexachlorocyclohexane-beta)
0.0091(3)
0.017(3)
gamma-BHC (Lindane)
(Hexachlorocyclohexane-gamma)
0.95
0.2(9)
1.8
Polychlorinated biphenyls (PCBs)
0.014(13)
0.000064(3)(13)
0.000064(3)(13)
Toxaphene
0.73
0.0002
0.00028(3)
0.00028(3)
Antimony
5.6
640
Arsenic
340
150
10(3)(9)
10(3)(9)
Asbestos
7,000,000
fibers/L(9)
Beryllium
4(9)
Cadmium
2.0(4)
0.25(4)
5(9)
Chromium (III)
569.8(4)
74.1(4)
100(9) (total)
Chromium (VI)
16
11
100(9) (total)
Copper
13.4(4)
9(4)
1000(7)
Cyanide (free)
22
5.2
140(6)
140(6)
Lead
64.6(4)
2.5(4)
15(9)
Mercury
1.4
0.77
0.050
0.051
Nickel
468.2(4)
52.0(4)
610
4,600
Selenium
20(10)
5(10)
50(9)
4,200
Silver
1.7(4)(16)
100(11)
Thallium
0.24
0.47
Zinc
117.2(4)
118.1(4)
5,000(7)
26,000
Dioxin (2,3,7,8-TCDD)
0.000000005(3)
0.000000005(3)
(b) Non-Priority Pollutants.
Aquatic Life
Human Health Consumption of
Non-Priority Pollutant
Acute Value (µg/L)
Chronic Value (µg/L)
Fish and Drinking Water(2)
							 (µg/L)
Fish(8)
							 (µg/L)
Alachlor
2(9)
Aluminum (pH 6.5-9.0 only)
750
87(14)
Ammonia
See Appendix C
Atrazine
3(9)
Barium
2,000(9)
Bis(chloromethyl) ether
0.00010(3)
0.00029(3)
Bromate
10(9)
Carbofuran
40(9)
Chloride
860,000(15)
230,000(15)
Chlorine (total residual)
19
11
Chlorite
1,000(9)
Chlorophenoxy herbicide (2,4,5-TP)
10
Chlorpyrifos
0.083
0.041
Chlorophenoxy herbicide (2,4-D)
70(9)
Dalapon
200(9)
Demeton
0.1
Di(2-ethylhexyl) adipate
400(9)
Diazinon
0.17
0.17
Dibromochloropropane (DBCP)
0.2(9)
cis-1,2-Dichloroethylene
70(9)
Dinoseb
7(9)
Dinitrophenols
69
5,300
Dissolved Gases
100% Sat.
Dissolved Oxygen
See Appendix D
E. coli
See Section
							 27
Diquat
20(9)
Endothall
100(9)
Ethylene dibromide (EDB)
0.05(9)
Fluoride
2000(11)
Glyphosate
700(9)
Guthion
0.01
Haloacetic acids
60(9)
Hexachlorocyclo-hexane -technical
0.0123(3)
0.0414(3)
Iron
1000(12)
300(11)
Malathion
0.1
Manganese
3110(4)(12)
1462(4)(12)
50(11)
Methoxychlor
0.03
40(9)
Mirex
0.001
Nitrite (as N)
1000(9)
Nitrates (as N)
10000(9)
Nitrite+Nitrate (both as N)
10000(9)
Nitrosamines
0.0008
1.24
Nitrosodibutylamine, N
0.0063(3)
0.22(3)
Nitrosodiethylamine, N
0.0008(3)
1.24(3)
Nitrosopyrrolidine, N
0.016(3)
34(3)
Nonylphenol
28
6.6
Oxamyl (Vydate)
200(9)
Parathion
0.065
0.013
Pentachlorobenzene
1.4
1.5
pH
6.5-9.0
Picloram
500(9)
Simazine
4(9)
Styrene
100(9)
Hydrogen Sulfide (H2S;
							 Undissociated)
2
1,2,4,5-Tetrachlorobenzene
0.97
1.1
Tributyltin (TBT)
0.46
0.072
2,4,5-Trichlorophenol
1.0(7)
3,600
Total trihalomethanes (TTHM)
80(9)
2,4,5-TP (2,4,5-trichlorophenoxy) Propionic
							 acid
50(9)
Xylenes
10,000(9)
(1)Except for the aquatic life values
				  for metals and where otherwise indicated, the values given in Appendix B refer
				  to the total recoverable (dissolved plus suspended) amount of each substance.
				  For the aquatic life values for metals, the values refer to dissolved
				  amount.
(2)Except where otherwise indicated,
				  these values are based on EPA Section 304(a) criteria recommendations assuming
				  consumption of 2 liters of water and 17.5 grams of aquatic organisms per
				  day.
(3)Except for arsenic, the substance
				  is classified as a carcinogen with the value based on an incremental risk of
				  one additional instance of cancer in one million persons. Arsenic is classified
				  as a carcinogen, however, the value is not based on an additional 1:1,000,000
				  cancer risk.
(4)Hardness dependent criterion. Value
				  given is an example only and is based on a CaCO3
				  hardness of 100 mg/L. Criteria for hardness concentrations other
				  than 100 mg/L as CaCO3 must be calculated using the
				  formulas in Appendix F.
(5)pH dependent criterion. Value given
				  is an example only and is based on a pH of 7.8. Criteria for pH values other
				  than 7.8 must be calculated using the formulas in Appendix G.
(6)Criterion expressed as total
				  cyanide, even though the method used to derive the criterion is based on free
				  cyanide. If a substantial fraction of the cyanide present in a water body is
				  present in a complexed form (e.g.
				  Fe4[Fe(CN)6]3),
				  this criterion may be overly conservative.
(7)Criterion is based on organoleptic
				  (taste and odor) effects and is more stringent than if based solely on toxic or
				  carcinogenic effects.
(8)EPA Section 304(a) human health
				  criteria recommendation assuming consumption of contaminated aquatic organisms
				  at a rate of 17.5 grams per day.
(9)Criterion is based on an EPA
				  drinking water standard (maximum contaminant level or MCL).
(10)This value is expressed in terms
				  of total recoverable metal in the water column. It is scientifically acceptable
				  to use a conversion factor (0.996 for the acute and 0.922 for the chronic) to
				  convert this number to a value that is expressed in terms of a dissolved metal.
				  Using these conversion factors, the aquatic life acute value for selenium is
				  19.92 µg/L as a dissolved metal and the aquatic life chronic value for
				  selenium is 4.61 µg/L as a dissolved metal.
(11) Criterion is based on Safe
				  Drinking Water Act secondary standards and is intended to prevent undesirable
				  cosmetic or aesthetic effects. Value represents the dissolved amount of each
				  substance rather than the total amount. Criterion only applies where drinking
				  water is an actual use.
(12)Value is based on the dissolved
				  amount which is the amount that will pass through a 0.45 µm membrane
				  filter prior to acidification to pH 1.5-2.0 with nitric acid.
(13)This criterion applies to
				  total PCBs (i.e. the sum of all congener or all isomer or homolog or Aroclor
				  analyses).
(14)The 87 µg/L chronic
				  criterion for aluminum is based on information showing chronic effects on brook
				  trout and striped bass. The studies underlying the 87 µg/L chronic value,
				  however, were conducted at low pH (6.5-6.6) and low hardness (< 10 mg/L
				  CaCO3), conditions uncommon in Wyoming surface waters. A
				  water effect ratio toxicity study in West Virginia indicated that aluminum is
				  substantially less toxic at higher pH and hardness (although the relationship
				  is not well quantified at this time). EPA is also aware of field data
				  indicating that many high quality waters in the U.S. contain more than 87
				  µg/L when either total recoverable or dissolved aluminum is measured.
				  Based on this information and considering the available toxicological
				  information in Tables 1 and 2 of EPAs Aluminum Criteria Document (EPA
				  440/5-86-008 ), the department will implement the 87 µg/L chronic
				  criterion for aluminum as follows: the 87 µg/L chronic criterion will
				  apply except where the receiving water after mixing has a pH greater than or
				  equal to 7.0 and a hardness (as CaCO3) greater than or
				  equal to 50 mg/L. Where the receiving stream after mixing has a pH greater than
				  or equal to 7.0 and a hardness (as CaCO3) greater than
				  or equal to 50 mg/L, the 750 µg/L acute criterion will apply. In
				  situations where the 87 µg/L chronic criterion applies, a discharger may
				  request development of and provide the basis for a site-specific chronic
				  criterion based on a water-effect ratio.
(15)Criterion applies on Class 1,
				  2AB, 2B and 2C waters only.
(16)Criterion has been divided by
				  two to be comparable with other acute values derived using an averaging period.
				  Value can be multiplied by two if criterion is to be used as an instantaneous
				  maximum or end of pipe value, as the original criterion was derived using EPA's
				  1980 guidelines as a not to be exceeded instantaneous maximum.
(c) Site-Specific Criteria. The criteria in this section are
				  applicable only to the waters and/or locations specified and replaces similar
				  criteria expressed elsewhere in these regulations.
(i) Belle Fourche Drainage
(A) The numeric human health criteria for iron and manganese
				  shall not apply to Class 2 waters in the Belle Fourche River Drainage above the
				  confluence of Donkey Creek and the main stem of the Belle Fourche River;
(B) The numeric human health criteria for iron and manganese
				  shall not apply to main stem of the Belle Fourche River below the confluence of
				  Donkey Creek.
(ii) Big Horn River Drainage
(A) Cottonwood Creek (near Hamilton Dome): The aquatic life
				  criterion for chloride shall be 860 mg/L and the aquatic life criterion for
				  selenium shall be 43 µg/L. These values represent instantaneous maximum
				  values, not to be exceeded at any time.
(iii) Cheyenne River Drainage
(A) The numeric human health criteria for iron and manganese
				  shall not apply to Class 2 tributaries of Antelope Creek;
(B) The numeric human health criteria for iron and manganese
				  shall not apply to Little Thunder Creek and all of its Class 2 tributaries
				  below the confluence of North Prong.
(iv) Little Powder River Drainage
(A) The numeric human health criteria for iron and manganese
				  shall not apply to Class 2 waters in the Little Powder River Drainage.
(v) North Platte River Drainage
(A) Poison Spider Creek: The aquatic life criterion for
				  chloride shall be 531 mg/L. This value represents an instantaneous maximum
				  value, not to be exceeded at any time.
(vi) Powder River Drainage
(A) The numeric human health criteria for iron and manganese
				  shall not apply to Class 2 waters in the Powder River Drainage except on the
				  following waters:
(I) The main stem of Clear Creek and its Class 2 tributaries
				  upstream of Clearmont, Wyoming;
(II) The main stem of Crazy Woman Creek and its Class 2
				  tributaries;
(III) The North Fork of the Powder River and all its Class 2
				  tributaries; and
(IV) The Middle Fork of the Powder River and all its Class 2
				  tributaries.
(B) Salt Creek: The aquatic life criterion for chloride shall
				  be 1600 mg/L. This value represents an instantaneous maximum value, not to be
				  exceeded at any time.
(C) Meadow Creek (tributary to Salt Creek): The aquatic life
				  criterion for chloride shall be 1600 mg/L. This value represents an
				  instantaneous maximum value, not to be exceeded at any time.
(D) Powder River below Salt Creek: The aquatic life criterion
				  for chloride shall be 984 mg/L. This value represents an instantaneous maximum
				  value, not to be exceeded at any time.