Wisconsin Administrative Code › Department of Natural Resources › NR 100-199 - Environmental Protection - General › Chapter NR 105 - Surface Water Quality Criteria And Secondary Values For Toxic Substances › Section NR 105.08 - Human threshold criteria

Current through June 24, 2024
(1) The human
				threshold criterion (HTC) is the maximum concentration of a substance
				established to protect humans from adverse effects resulting from contact with
				or ingestion of surface waters of the state and from ingestion of aquatic
				organisms taken from surface waters of the state. Human threshold criteria are
				derived for those toxic substances for which a threshold dosage or
				concentration can be estimated below which no adverse effect or response is
				likely to occur.
(2) For
				noncarcinogenic components of mixtures in effluents, interactions among
				substances may be additive, antagonistic or synergistic and may be accounted
				for by a model that is supported by credible scientific evidence. The risks are
				assumed to be additive when substances are members of the same structural class
				and cause potential adverse effects via the same mechanism of action,
				influencing the same kind of endpoint, and shall be accounted for by a model
				that is supported by credible scientific evidence.
(3) Human threshold criteria are listed in
				Table 8. Criteria for the same substance may be different depending on the
				surface water classification, due to the lipid value of representative fish, a
				component of the BAF, and whether or not the water may be a source of drinking
				water. Further application of these criteria to protect drinking water and
				downstream uses in the Great Lakes system shall be according to s.
				NR
				106.06(1)
(4) To derive human threshold criteria for
				substances not included in Table 8 the following methods shall be used:
(a) The human threshold criterion shall be
				calculated as follows:
HTC = ADE x 70 kg x RSC / WH +
				  (FHx BAF)
Where:
HTC = Human threshold criterion in milligrams per liter
				  (mg/L).
ADE = Acceptable daily exposure in milligrams toxicant per
				  kilogram body weight per day (mg/kg-d) as specified in sub. (5).
70 kg = Average weight of an adult male in kilograms (kg).
				  RSC = Relative source contribution factor used to account for routes of
				  exposure other than consumption of contaminated water and aquatic organisms. In
				  the absence of sufficient data on alternate sources of exposure, including but
				  not limited to non- fish diet and inhalation, the relative source contribution
				  factor shall be set equal to 0.8.
WH = Average per capita daily water
				  consumption of 2 liters per day (L/d) for surface waters classified as public
				  water supplies or, for all other surface waters, 0.01 liters per day (L/d) for
				  exposure through body contact or ingestion of small volumes of water during
				  swimming or other recreational activities.
FH = Average per capita daily
				  consumption of sport-caught fish by Wisconsin anglers equal to 0.02 kilograms
				  per day (kg/d).
BAF = Aquatic organism bioaccumulation factor with units of
				  liter per kilogram (L/kg) as derived in s.
				  NR
				  105.10.
Table 8
Human Threshold Criteria
(ug/L unless specified otherwise)
Public Water Supply
Non-Public Water Supply
Substance
Warm Water Sport Fish Communities
Cold Water4
								  Communities
Warm Water Forage, Limited Forage, and Warm Water
								Sport Fish Communities
Cold Water Communities
Limited Aquatic Life
1. Acrolein
7.2
3.4
15
4.4
2,800
2. Antimony
5.6
5.6
373
373
1,120
3. Benzene2
5
5
610
260
4,000
4. Bis(2-chloroisopropyl) ether
1,100
1,100
55,000
34,000
220,000
5. Cadmium
4.4
4.4
370
370
880
6. *Chlordane (ng/L)
2.4
0.70
2.4
0.70
310,000
7. Chlorobenzene2
100
100
1,210
400
28,000
8. Chromium,
								total2
100
100
9. Chromium (+3)
41,750
41,750
3,818,000
3,818,000
8,400,000
10. Chromium (+6)
83.5
83.5
7,636
7,636
16,800
11. Cyanide,
								Total2
138.6
138.6
9,300
9,300
28,000
12. *4.4'-DDT (ng/L)
3.0
0.88
3.0
0.88
2800000
13.
								1,2-Dichlorobenzene2
446
273
1,509
481
126,000
14. 1,3-Dichlorobenzene
1,400
710
3,300
1,000
500,000
15.
								cis-1,2-Dichloroethene2
70
70
14,000
9,000
56,000
16.
								trans-1,2-Dichloroethene2
100
100
24,000
13,000
110,000
17.
								Dichloromethane2
(methylene chloride)
5
5
95,000
72,000
328,000
18. 2,4-Dichlorophenol
74
58
580
180
17,000
19.
								Dichloropropenes3
(1,3-Dichloropropene)
8.3
8.2
420
260
1,700
20. *Dieldrin (ng/L)
0.59
0.17
0.59
0.17
280,000
21. 2,4-Dimethylphenol
450
430
11,000
4,500
94,000
22. Diethyl
								phthalate2
5,000
5,000
68,000
21,000
4,500,000
23. Dimethyl phthalate (mg/L)
241
184
1,680
530
56,000
24. 4,6-Dinitro-o-cresol
100
96
1,800
640
22,000
25.
								Dinitrophenols3
(2,4-Dinitrophenol)
55
55
2,800
1,800
11,000
26. 2,4-Dinitrotoluene
0.51
0.48
13
5.3
110
27. Endosulfan
87
41
181
54
33,600
28. Ethylbenzene2
567
401
2,920
931
140,000
29. Fluoranthene
890
610
4,300
1,300
220,000
30. *Hexachlorobenzene
0.075
0.022
0.075
0.022
4,500
31. Hexachlorocyclopentadiene
34.7
25.6
195
65.3
8,400
32. Hexachloroethane
8.7
3.3
13
3.7
5,600
33. *gamma-BHC
								(lindane)2
0.20
0.20
0.84
0.25
1,900
34. Isophorone
5,500
5,300
180,000
80,000
1,100,000
35. Lead
10
10
140
140
2,240
36. *Mercury5
0.0015
0.0015
0.0015
0.0015
336
37. Nickel2
100
100
43,000
43,000
110,000
38. *Pentachlorobenzene
0.46
0.14
0.47
0.14
4,500
39. Selenium2
50
50
2,600
2,600
28,000
40. Silver
140
140
28,000
28,000
28,000
41. *2,3,7,8-TCDD (pg/L)
0.11
0.032
0.11
0.032
7,300
42. *1,2,4,5-Tetrachlorobenzene
0.54
0.17
0.58
0.17
1,700
44. Toluene2
1,000
1,000
15,359
5,201
280,000
45.
								1,1,1-Trichloroethane2
200
200
270,000
110,000
2,000,000
46. 2,4,5-Trichlorophenol
1,600
830
3,900
1,200
560,000
* Indicates substances that are BCCs.
1 A human threshold criterion expressed in micrograms per
				  liter (ug/L) can be converted to milligrams per liter (mg/L) by dividing the
				  criterion by 1000.
2 For this substance the human threshold criteria for public
				  water supply receiving water classifications equal the maximum contaminant
				  level pursuant to s. NR 105.08(4) (b).
3 The human threshold criteria for this chemical class are
				  applicable to each isomer.
4 For BCCs, these criteria apply to all water of the Great
				  Lakes system.
5 The mercury criteria were calculated using 20 g/day fish
				  consumption and the human non-cancer criteria derivation procedure in 40 CFR
				  Part 132, Appendix C. For these criteria, 40 CFR Part 132, Appendix C as stated
				  on September 1, 1997 is incorporated by reference.
(b) For surface waters classified as public
				water supplies, if the human threshold criterion for a toxic substance as
				calculated in par. (a) exceeds the maximum contaminant level (MCL) for that
				substance as specified in ch. NR 809 or the July 8, 1987 Federal Register (52
				FR 25690), the MCL shall be used as the human threshold criterion.