Idaho Administrative Code
Title IDAPA 58 - Environmental Quality, Department of
Rule 58.01.02 - WATER QUALITY STANDARDS
Section 58.01.02.210 - NUMERIC CRITERIA FOR TOXIC SUBSTANCES FOR WATERS DESIGNATED FOR AQUATIC LIFE, RECREATION, OR DOMESTIC WATER SUPPLY USE
Current through August 31, 2023
01. Criteria for Toxic Substances. The criteria of Section 210 apply to surface waters of the state as provided in Tables 1 and 2. (3-31-22)
Subsections 210.01 and 210.01.a. are effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. |
01. Criteria for Toxic Substances. The criteria of Section 210 apply to surface waters of the state as provided in Tables 1 and 2 Criteria for metals (arsenic through zinc) listed in Tables 1 and 2 are expressed as a dissolved fraction (i.e., passes through a forty-five hundredths (0.45) micron filter) unless otherwise noted. (4-6-23)
Subsections 210.01 and 210.01.a. are not effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. |
Table 1. Criteria for Protection of Aquatic Life |
|||||
Compound |
a CAS Number |
b CMC (µg/L) |
b CCC (µg/L) |
||
Inorganic Compounds/Metals |
|||||
Arsenic |
7440382 |
340 |
c |
150 |
c |
Cadmium |
7440439 |
1.3 |
f |
0.6 |
f |
Chromium III |
16065831 |
570 |
f |
74 |
f |
Chromium VI |
18540299 |
16 |
c |
11 |
c |
Copper |
7440508 |
12.3 |
k |
7.6 |
k |
Lead |
7439921 |
65 |
f |
2.5 |
f |
Mercury |
7439976 |
e |
e |
||
Note: In 2005, Idaho adopted EPA's recommended methylmercury fish tissue criterion for protection of human health (docket 58-0102-0302). The decision was made to remove the old tissue-based aquatic life criteria and rely on the fish tissue criterion to provide protection for aquatic life as well as human health. Thus, current Idaho water quality stan-dards do not have mercury water column criteria for the protection of aquatic life. While EPA approved Idaho's adop-tion of the fish tissue criterion in September 2005, it had withheld judgment on Idaho's removal of aquatic life criteria. On December 12, 2008, EPA disapproved Idaho's removal of the old aquatic life criteria. The water column criteria for total recoverable mercury published in 2004 Idaho Administrative Code continue to apply and are effective for CWA purposes. For more information go to http://www.deq.idaho.gov/epa-actions-on-proposed-standards. |
|||||
Nickel |
7440020 |
470 |
f |
52 |
f |
Selenium |
7782492 |
m |
l |
||
Silver |
7440224 |
3.4 |
f |
||
Zinc |
7440666 |
120 |
f |
120 |
f |
Inorganic Compounds/Non-Metals |
|||||
Chlorine |
19 |
h |
11 |
h |
|
Cyanide |
57125 |
22 |
g |
5.2 |
g |
Organic Compounds |
|||||
Acrolein |
107028 |
--1 -------------- 32 |
--1 -------------- 32 |
||
1Effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-1802 have been approved. 2Not effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-1802 have been approved. |
|||||
Aldrin |
39002 |
3 |
|||
gamma-BHC (Lindane) |
58899 |
2 |
0.08 |
||
Carbaryl |
63252 |
--1 -------------- 2.12 |
--1 -------------- 2.12 |
||
1Effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-1802 have been approved. 2Not effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-1802 have been approved. |
|||||
Chlordane |
57749 |
2.4 |
0.0043 |
||
4,4'-DDT |
50293 |
1.1 |
0.001 |
||
Diazinon |
333415 |
--1 -------------- 0.172 |
--1 -------------- 0.172 |
||
1Effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-1802 have been approved. 2Not effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-1802 have been approved. |
|||||
Dieldrin |
60571 |
2.5 |
0.0019 |
||
alpha-Endosulfan |
959988 |
0.22 |
0.056 |
||
beta-Endosulfan |
33213659 |
0.22 |
0.056 |
||
Endrin |
72208 |
0.18 |
0.0023 |
||
Heptachlor |
76448 |
0.52 |
0.0038 |
||
Heptachlor Epoxide |
1024573 |
0.52 |
0.0038 |
||
Pentachlorophenol |
87865 |
20 |
i |
13 |
i |
Polychlorinated Biphenyls PCBs |
j |
0.014 |
|||
Toxaphene |
8001352 |
0.73 |
0.0002 |
||
Footnotes for Table 1. Criteria for Protection of Aquatic Life |
|||||
a. Chemical Abstracts Service (CAS) registry numbers which provide a unique identification for each chemical. |
|||||
b. See definitions of Acute Criteria (CMC) and Chronic Criteria (CCC), Section 010 of these rules. |
|||||
c. Criteria for these metals are expressed as a function of the water effect ratio, WER, as defined in Subsection 210.03.c.iii. CMC = CMC column value X WER. CCC = CCC column value X WER. |
|||||
d. Criterion expressed as total recoverable (unfiltered) concentrations. |
|||||
e. No aquatic life criterion is adopted for inorganic mercury. However, the narrative criteria for toxics in Section 200 of these rules applies. The Department believes application of the human health criterion for methylmercury will be protective of aquatic life in most situations. |
|||||
f. Aquatic life criteria for these metals are a function of total hardness (mg/L as calcium carbonate), the pollutant's water effect ratio (WER) as defined in Subsection 210.03.c.iii. and multiplied by an appropriate dissolved conversion factor as defined in Subsection 210.02. For comparative purposes only, the example values displayed in this table are shown as dissolved metal and correspond to a total hardness of one hundred (100) mg/L and a water effect ratio of one (1.0). |
|||||
g. Criteria are expressed as weak acid dissociable (WAD) cyanide. |
|||||
h. Total chlorine residual concentrations. |
|||||
i. Aquatic life criteria for pentachlorophenol are expressed as a function of pH, and are calculated as follows. Values displayed above in the table correspond to a pH of seven and eight tenths (7.8). CMC = exp(1.005(pH)-4.830) CCC = exp(1.005(pH)-5.290) |
|||||
j. PCBs are a class of chemicals which include Aroclors, 1242, 1254, 1221, 1232, 1248, 1260, and 1016, CAS numbers 53469219, 11097691, 11104282, 11141165, 12672296, 11096825 and 12674112 respectively. The aquatic life criteria apply to this set of PCBs. |
|||||
k. Aquatic life criteria for copper shall be derived in accordance with Subsection 210.03.c.v. For comparative pur-poses only, the example values displayed in this table correspond to the Biotic Ligand Model output based on the fol-lowing inputs: temperature = 14.9°C, pH = 8.16, dissolved organic carbon = 1.4 mg/L, humic acid fraction = 10%, calcium = 44.6 mg/L, magnesium = 11.0 mg/L, sodium = 11.7 mg/L, potassium = 2.12 mg/L, sulfate = 46.2 mg/L, chlo-ride = 12.7 mg/L, alkalinity = 123 mg/L CaCO3, and sulfide = 1.00 x 10-8 mg/L. |
|||||
l. Chronic |
Short-term |
||||
Egg-Ovary (mg/kg dw) |
Fish Tissue (mg/kg dw) |
Water Column (µg/L) |
Water Column (µg/L) |
||
Egg-Ovary |
Whole-Body |
Muscle |
Water Lentic |
Water Lotic |
Water |
15.11 |
8.52 |
11. 32 |
1.5 (30 day average)3 |
3.1 (30 day average)3 |
Intermittent Exposure Equation3.4 |
mg/kg dw - milligrams per kilogram dry weight, µg/L - micrograms per liter |
|||||
1. Egg-ovary supersedes any whole-body, muscle, or water column element when fish egg-ovary concentrations are measured. Single measurement of an average or composite sample of at least five (5) individuals of the same species. Not to be exceeded; DEQ will evaluate all representative egg-ovary data to determine compliance with this criterion element. 2. Fish whole-body or muscle tissue supersedes water column element when both fish tissue and water concen-trations are measured. Single measurement of an average or composite sample of at least five (5) individuals of the same species where the smallest individual is no less than seventy-five percent (75%) of the total length (size) of the largest individual. Not to be exceeded; DEQ will evaluate all representative whole body or muscle data to determine compliance with this criterion element. 3. Water column values are based on dissolved total selenium in water and are derived from fish tissue values via bioaccumulation modeling. Water column values are the applicable criterion element in the absence of steady-state condition fish tissue data. In fishless waters, selenium concentrations in fish from the nearest downstream waters may be used to assess compliance using methods provided in Aquatic Life Ambient Water Quality Criterion for Selenium - Freshwater, EPA-822-R-16-006, Appendix K: Translation of a Selenium Fish Tissue Criterion Element to a Site-Specific Water Column Value (June 2016). |
|||||
4. Intermittent Exposure Equation= where WQC is the applicable water column element, for either lentic or lotic waters; Cbkgrnd is the average back-ground selenium concentration, and fint is the fraction of any 30-day period during which elevated selenium concentra-tions occur, with fint assigned a value [GREATER THAN EQUAL TOO] 0.033 (corresponding to one day). |
|||||
m. There is no specific acute criterion for aquatic life; however, the aquatic life criterion is based on chronic effects of the selenium on aquatic life and is expected to adequately protect against acute effects. |
(3-31-22)
Table 2. Criteria for Protection of Human Health (based on consumption of:) |
||||||
Compound |
a CAS Number |
Carcinogen? |
Water & Fish (µg/L unless otherwise specified) |
Fish Only (µg/L unless otherwise specified) |
||
Inorganic Compounds/Metals |
||||||
Antimony |
7440360 |
5.2 |
b |
190 |
b |
|
Arsenic1 |
7440382 |
Y |
10 |
cdj |
10 |
cdj |
Note: In 2008, Idaho adopted 10 µg/L as its CWA arsenic criterion for both exposure through fish consumption only and exposure through drinking water+fish consumption, choosing the SDWA MCL due to concerns about background levels that exceed EPA's 304(a) criteria (docket 58-0102-0801). EPA approved this action in 2010. In June 2015, Northwest Environmental Advocates challenged EPA's 2010 approval. Court remanded action back to EPA. On September 15, 2016, EPA disapproved Idaho's adoption of 10 µg/L. Neither EPA nor the state of Idaho has promulgated replacement criteria. For more information, go to http://www.deq.idaho.gov/epa-actions-on-proposed-standards. |
||||||
1Effective for CWA purposes. Water & Fish value, Fish Only value, and footnotes continue to be effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. See Arsenic2 immediately below. |
||||||
Arsenic2 |
7440382 |
Y |
10 |
cdj |
4.3; 8.0 µg/kg fish tissue |
ck |
2Not yet effective for CWA purposes. Fish Only value and footnote k are not effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. |
||||||
Beryllium |
7440417 |
e |
e |
|||
Cadmium |
7440439 |
e |
e |
|||
Chromium III |
16065831 |
e |
e |
|||
Chromium VI |
18540299 |
e |
e |
|||
Copper |
7440508 |
1300 |
j |
|||
Lead |
7439921 |
e |
e |
|||
Methylmercury |
22967926 |
0.3mg/kg |
i |
|||
Nickel |
7440020 |
58 |
b |
100 |
b |
|
Selenium |
7782492 |
29 |
b |
250 |
b |
|
Thallium |
7440280 |
0.017 |
b |
0.023 |
b |
|
Zinc |
7440666 |
870 |
b |
1,500 |
b |
|
Inorganic Compounds/Non-Metals |
||||||
Cyanide |
57125 |
3.9 |
b |
140 |
b |
|
Asbestos |
1332214 |
7,000,000 Fibers/L |
j |
|||
Organic Compounds |
||||||
Acenaphthene |
83329 |
26 |
b |
28 |
b |
|
Acenaphthylene |
208968 |
e |
e |
|||
Acrolein |
107028 |
3.2 |
b |
120 |
b |
|
Acrylonitrile |
107131 |
Y |
0.60 |
bf |
22 |
bf |
Aldrin |
309002 |
Y |
2.5E-06 |
bf |
2.5E-06 |
bf |
Anthracene |
120127 |
110 |
b |
120 |
b |
|
alpha-BHC |
319846 |
Y |
0.0012 |
bf |
0.0013 |
bf |
beta-BHC |
319857 |
Y |
0.036 |
bf |
0.045 |
bf |
gamma-BHC (Lindane) |
58899 |
1.4 |
b |
1.4 |
b |
|
delta-BHC |
319868 |
e |
e |
|||
Benzene |
71432 |
3.0 |
bf |
28 |
b |
|
Benzidine |
92875 |
Y |
0.0014 |
bf |
0.033 |
bf |
Benzo(a)Anthracene |
56553 |
Y |
0.0042 |
bf |
0.0042 |
bf |
Benzo(b)Fluoranthene |
205992 |
Y |
0.0042 |
bf |
0.0042 |
bf |
Benzo(k)Fluoranthene |
207089 |
Y |
0.042 |
bf |
0.042 |
bf |
Benzo(ghi)Perylene |
191242 |
e |
e |
|||
Benzo(a)Pyrene |
50328 |
Y |
0.00042 |
bf |
0.00042 |
bf |
Bis(2-Chloroethoxy) Methane |
111911 |
e |
e |
|||
Bis(2-Chloroethyl) Ether |
111444 |
Y |
0.29 |
bf |
6.8 |
bf |
Bis(2-Chloroisopropyl) Ether |
108601 |
220 |
b |
1,200 |
b |
|
Bis(Chloromethyl) Ether |
542881 |
Y |
0.0015 |
bf |
0.055 |
bf |
Bis(2-Ethylhexyl) Phthalate |
117817 |
Y |
1.2 |
bf |
1.2 |
bf |
Bromoform |
75252 |
Y |
62 |
bf |
380 |
bf |
4-Bromophenyl Phenyl Ether |
101553 |
e |
e |
|||
Butylbenzyl Phthalate |
85687 |
0.33 |
b |
0.33 |
b |
|
Carbon Tetrachloride |
56235 |
Y |
3.6 |
bf |
15 |
bf |
Chlorobenzene |
108907 |
89 |
b |
270 |
b |
|
Chlordane |
57749 |
Y |
0.0010 |
bf |
0.0010 |
bf |
Chlorodibromomethane |
124481 |
Y |
7.4 |
bf |
67 |
bf |
Chloroethane |
75003 |
e |
e |
|||
2-Chloroethylvinyl Ether |
110758 |
e |
e |
|||
Chloroform |
67663 |
61 |
b |
730 |
b |
|
2-Chloronaphthalene |
91587 |
330 |
b |
380 |
b |
|
2-Chlorophenol |
95578 |
30 |
b |
260 |
b |
|
Chlorophenoxy Herbicide (2,4-D) |
94757 |
1,000 |
b |
3,900 |
b |
|
Chlorophenoxy Herbicide (2,4,5-TP) [Silvex] |
93721 |
82 |
b |
130 |
b |
|
4-Chlorophenyl Phenyl Ether |
7005723 |
e |
e |
|||
Chrysene |
218019 |
Y |
0.42 |
bf |
0.42 |
bf |
4,4'-DDD |
72548 |
Y |
0.00042 |
bf |
0.00042 |
bf |
4,4'-DDE |
72559 |
Y |
5.5E-05 |
bf |
5.5E-05 |
bf |
4,4'-DDT |
50293 |
Y |
9.8E-05 |
bf |
9.8E-05 |
bf |
Di-n-Butyl Phthalate |
84742 |
8.2 |
b |
8.3 |
b |
|
Di-n-Octyl Phthalate |
117840 |
e |
e |
|||
Dibenzo (a,h) Anthracene |
53703 |
Y |
0.00042 |
bf |
0.00042 |
bf |
1,2-Dichlorobenzene |
95501 |
700 |
b |
1,100 |
b |
|
1,3-Dichlorobenzene |
541731 |
3.5 |
b |
4.8 |
b |
|
1,4-Dichlorobenzene |
106467 |
180 |
b |
300 |
b |
|
3,3'-Dichlorobenzidine |
91941 |
Y |
0.29 |
bf |
0.48 |
bf |
Dichlorobromomethane |
75274 |
Y |
8.8 |
bf |
86 |
bf |
1,1-Dichloroethane |
75343 |
e |
e |
|||
1,2-Dichloroethane |
107062 |
Y |
96 |
bf |
2,000 |
bf |
1,1-Dichloroethylene |
75354 |
310 |
b |
5,200 |
b |
|
2,4-Dichlorophenol |
120832 |
9.6 |
b |
19 |
b |
|
1,2-Dichloropropane |
78875 |
Y |
8.5 |
bf |
98 |
bf |
1,3-Dichloropropene |
542756 |
Y |
2.5 |
bf |
38 |
bf |
Dieldrin |
60571 |
Y |
4.2E-06 |
bf |
4.2E-06 |
bf |
Diethyl Phthalate |
84662 |
200 |
b |
210 |
b |
|
2,4-Dimethylphenol |
105679 |
110 |
b |
820 |
b |
|
Dimethyl Phthalate |
131113 |
600 |
b |
600 |
b |
|
Dinitrophenols |
25550587 |
13 |
b |
320 |
b |
|
2,4-Dinitrophenol |
51285 |
12 |
b |
110 |
b |
|
2,4-Dinitrotoluene |
121142 |
Y |
0.46 |
bf |
5.5 |
bf |
2,6-Dinitrotoluene |
606202 |
e |
e |
|||
1,2-Diphenylhydrazine |
122667 |
Y |
0.25 |
bf |
0.65 |
bf |
2, 3, 7, 8-TCDD Dioxin |
1746016 |
Y |
1.8E-08 |
bf |
1.9E-08 |
bf |
alpha-Endosulfan |
959988 |
7.0 |
b |
8.5 |
b |
|
beta-Endosulfan |
33213659 |
11 |
b |
14 |
b |
|
Endosulfan Sulfate |
1031078 |
9.9 |
b |
13 |
b |
|
Endrin |
72208 |
0.011 |
b |
0.011 |
b |
|
Endrin Aldehyde |
7421934 |
0.38 |
b |
0.40 |
b |
|
Ethylbenzene |
100414 |
32 |
b |
41 |
b |
|
Fluoranthene |
206440 |
6.3 |
b |
6.4 |
b |
|
Fluorene |
86737 |
21 |
b |
22 |
b |
|
Heptachlor |
76448 |
Y |
2.0E-05 |
bf |
2.0E-05 |
bf |
Heptachlor Epoxide |
1024573 |
Y |
0.00010 |
bf |
0.00010 |
bf |
Hexachlorobenzene |
118741 |
Y |
0.00026 |
bf |
0.00026 |
bf |
Hexachlorobutadiene |
87683 |
Y |
0.031 |
bf |
0.031 |
bf |
Hexachlorocyclohexane (HCH)-Technical |
608731 |
Y |
0.027 |
bf |
0.032 |
bf |
Hexachloro-cyclopentadiene |
77474 |
1.3 |
b |
1.3 |
b |
|
Hexachloroethane |
67721 |
0.23 |
b |
0.24 |
b |
|
Ideno (1,2,3-cd) Pyrene |
193395 |
Y |
0.0042 |
bf |
0.0042 |
bf |
Isophorone |
78591 |
Y |
330 |
bf |
6,000 |
bf |
Methoxychlor |
72435 |
0.0054 |
b |
0.0055 |
b |
|
Methyl Bromide |
74839 |
130 |
b |
3,700 |
b |
|
Methyl Chloride |
74873 |
e |
e |
|||
3-Methyl-4-Chlorophenol |
59507 |
350 |
b |
750 |
b |
|
2-Methyl-4,6-Dinitrophenol |
534521 |
1.6 |
b |
8.6 |
b |
|
Methylene Chloride |
75092 |
38 |
b |
960 |
b |
|
Naphthalene |
91203 |
e |
e |
|||
Nitrobenzene |
98953 |
12 |
b |
180 |
b |
|
2-Nitrophenol |
88755 |
e |
e |
|||
4-Nitrophenol |
100027 |
e |
e |
|||
N-Nitrosodimethylamine |
62759 |
Y |
0.0065 |
bf |
9.1 |
bf |
N-Nitrosodi-n-Propylamine |
621647 |
Y |
0.046 |
bf |
1.5 |
bf |
N-Nitrosodiphenylamine |
86306 |
Y |
3.14 |
bf |
18 |
bf |
Pentachlorobenzene |
608935 |
0.035 |
b |
0.036 |
b |
|
Pentachlorophenol |
87865 |
Y |
0.11 |
bf |
0.12 |
bf |
Phenanthrene |
85018 |
e |
e |
|||
Phenol |
108952 |
3,800 |
b |
85,000 |
b |
|
Polychlorinated Biphenyls PCBs |
g |
Y |
0.00019 |
bfh |
0.00019 |
bfh |
Pyrene |
129000 |
8.1 |
b |
8.4 |
b |
|
1,2,4,5-Tetrachlorobenzene |
95943 |
0.0093 |
b |
0.0094 |
b |
|
1,1,2,2-Tetrachloroethane |
79345 |
Y |
1.4 |
bf |
8.6 |
bf |
Tetrachloroethylene |
127184 |
15 |
b |
23 |
b |
|
Toluene |
108883 |
47 |
b |
170 |
b |
|
Toxaphene |
8001352 |
Y |
0.0023 |
bf |
0.0023 |
bf |
1,2-Trans-Dichloroethylene |
156605 |
120 |
b |
1,200 |
b |
|
1,2,4-Trichlorobenzene |
120821 |
0.24 |
b |
0.24 |
b |
|
1,1,1-Trichloroethane |
71556 |
11,000 |
b |
56,000 |
b |
|
1,1,2-Trichloroethane |
79005 |
Y |
4.9 |
bf |
29 |
bf |
Trichloroethylene |
79016 |
2.6 |
b |
11 |
b |
|
2,4,5-Trichlorophenol |
95954 |
140 |
b |
190 |
b |
|
2,4,6-Trichlorophenol |
88062 |
1.5 |
b |
2.0 |
b |
|
Vinyl Chloride |
75014 |
Y |
0.21 |
bf |
5.0 |
bf |
Footnotes for Table 2. Criteria for Protection of Human Health |
||||||
a. Chemical Abstracts Service (CAS) registry numbers which provide a unique identification for each chemical. |
||||||
b. This criterion is based on input values to human health criteria calculation specified in Idaho's Technical Sup-port Document (TSD) for Human Health Criteria Calculations - 2015. Criteria for non-carcinogens are calculated using the formula: and criteria for carcinogens are calculated using the formula: Where: AWQC = Ambient water quality criterion (mg/L) BW = Human Body Weight (kg), 80 is used in these criteria DI = Drinking Water Intake, (L/day), 2.4 is used in these criteria FI = Fish Intake, (kg/day), 0.0665 is used in these criteria BAF = Bioaccumualtion Factor, L/kg, chemical specific value, see TSD RfD = Reference dose (mg/kg-day), chemical specific value, see TSD RSC = Relative Source Contribution, chemical specific value, see TSD |
||||||
c. Inorganic forms only. |
||||||
d. Criterion expressed as total recoverable (unfiltered) concentrations. |
||||||
e. No numeric human health criteria has been established for this contaminant. However, permit authorities should address this contaminant in NPDES permit actions using the narrative criteria for toxics from Section 200 of these rules. |
||||||
f. EPA guidance allows states to choose from a range of 10-4 to 10-6 for the incremental increase in cancer risk used in human health criteria calculation. Idaho has chosen to base this criterion on carcinogenicity of 10-5 risk. |
||||||
g. PCBs are a class of chemicals which include Aroclors, 1242, 1254, 1221, 1232, 1248, 1260, and 1016, CAS numbers 53469219, 11097691, 11104282, 11141165, 12672296, 11096825 and 12674112 respectively. The aquatic life criteria apply to this set of PCBs. |
||||||
h. This criterion applies to total PCBs, (e.g. the sum of all congener, isomer, or Aroclor analyses). |
||||||
i. This fish tissue residue criterion (TRC) for methylmercury is based on a human health reference dose (RfD) of 0.0001 mg/kg body weight-day; a relative source contribution (RSC) estimated to be 27% of the RfD; a human body weight (BW) of 70 kg (for adults); and a total fish consumption rate of 0.0175 kg/day for the general population, summed from trophic level (TL) breakdown of TL2 = 0.0038 kg fish/day + TL3 = 0.0080 kg fish/day + TL4 = 0.0057 kg fish/day. This is a criterion that is protective of the general population. A site-specific criterion or a criterion for a par- ticular subpopulation may be calculated by using local or regional data, rather than the above default values, in the formula: TRC = [BW x {RfD - (RSCxRfD)}] / [SIGMA]TL. In waters inhabited by species listed as threatened or endangered under the Endangered Species Act or designated as their critical habitat, the Department will apply the human health fish tissue residue criterion for methylmercury to the highest trophic level available for sampling and analysis. |
||||||
j. This criterion is based on the drinking water Maximum Contaminant Level (MCL). |
||||||
k. For Fish Only exposure to inorganic arsenic, the human health criterion is: |
||||||
Fish Tissue (µg/kg wet-weight) |
Water Column (µg/L) |
|||||
8.01 |
4.32 |
|||||
1Fish tissue element is based on total recoverable inorganic arsenic in muscle or fillet. The fish tissue element super-sedes the water column element provided at least ninety (90) days have passed since any new activity or discharge has occurred within the water body. Fish tissue element will be applied in accordance with Subsection 210.03.e. 2Water column element is based on dissolved inorganic arsenic in water. |
||||||
Footnote k is not effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. |
(4-6-23)
02. Factors for Calculating Hardness Dependent Metals Criteria. Hardness dependent metals criteria are calculated using values from the following table in the equations: (3-31-22)
Metal |
mA |
bA |
mc |
bc |
aAcute Conversion Factor |
aChronic Conversion Factor |
Arsenic |
b |
b |
b |
b |
1.0 |
1.0 |
Cadmium |
0.8367 |
-3.560 |
0.6247 |
-3.344 |
0.944 see footnote a |
0.909 |
Chromium (III) |
0.819 |
3.7256 |
0.8190 |
0.6848 |
0.316 |
0.860 |
Chromium (VI) |
b |
b |
b |
b |
0.982 |
0.962 |
Lead |
1.273 |
-1.460 |
1.273 |
-4.705 |
0.791 |
0.791 |
Mercury |
b |
b |
b |
b |
0.85 |
0.85 |
Nickel |
0.846 |
2.255 |
0.8460 |
0.0584 |
0.998 |
0.997 |
Silver |
1.72 |
-6.52 |
c |
c |
0.85 |
c |
Zinc |
0.8473 |
0.884 |
0.8473 |
0.884 |
0.978 |
0.986 |
Note to table: The term "exp" represents the base e exponential function. Footnotes to table: a. Conversion factors (CF) are from "Stephan, C. E. 1995. Derivation of conversion factors for the calculation of dissolved freshwater aquatic life criteria for metals. U.S. Environmental Protection Agency, Environmental Research Laboratory - Duluth." The conversion factors for cadmium and lead are hardness-dependent and can be calculated for any hardness (see limitations in Subsection 210.03.b.i.) using the following equations. For comparative purposes, the conversion factors for a total hardness of one hundred (100) mg/L are shown in the table. The conversion factor shall not exceed one (1). Cadmium Acute: CF=1.136672-[(ln hardness)(0.041838)] NOTE: The cadmium acute criterion equation was derived from dissolved metals toxicity data and thus requires no conversion; this conversion factor may be used to back calculate an equivalent total recoverable concentration. Chronic: CF=1.101672-[(ln hardness)(0.041838)] Lead (Acute and Chronic): CF=1.46203-[(ln hardness)(0.145712) b. Not applicable c. No chronic criteria are available for silver. |
(3-31-22)
03. Applicability. The criteria established in Section 210 are subject to the general rules of applicability in the same way and to the same extent as are the other numeric chemical criteria when applied to the same use classifications. Mixing zones may be applied to toxic substance criteria subject to the limitations set forth in Section 060 and set out below. (3-31-22)
Aquatic Life |
Human Health |
||
CMC ("acute" criteria) |
1Q10 or 1B3 |
Non-carcinogens |
Harmonic mean flow |
CCC ("chronic" criteria) |
7Q10 or 4B3 |
Carcinogens |
Harmonic mean flow |
(3-31-22)
Effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. |
Not effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. |
Where:
WCT (µg/L) is the translated water column value; and
BAFSS L/kg is the site specific BAF calculated consistent with 210.03.e.v.
In fishless waters, surface water and fish tissue from the immediate downstream waters may be used for bioaccumulation modeling. In the absence of sufficient fish tissue data, the water column element is the applicable criterion element in fishless waters. (4-6-23)
Subsection 210.03.e. is not effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. |
04. National Pollutant Discharge Elimination System Permitting. For the purposes of NPDES permitting, interpretation and implementation of metals criteria listed in Subsection 210.02 should be governed by the following standards, that are hereby incorporated by reference, in addition to other scientifically defensible methods deemed appropriate by the Department; provided, however, any identified conversion factors within these documents are not incorporated by reference. Metals criteria conversion factors are identified in Subsection 210.02 of this rule. (3-31-22)
05. Development of Toxic Substance Criteria. (3-31-22)
Effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. |
Not effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. |
Not effective for CWA purposes until the date EPA issues written notification that the revisions in Docket No. 58-0102-2201 have been approved. |