Source: https://www.revisor.mn.gov/rules/7050.0220/
Timestamp: 2019-07-17 23:10:19
Document Index: 672024281

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﻿ 7050.0220 - MN Rules Part
Part 7050.0220
7050.0219 7050.0221
7050.0220 SPECIFIC WATER QUALITY STANDARDS BY ASSOCIATED USE CLASSES.
The numeric and narrative water quality standards in this chapter prescribe the qualities or properties of the waters of the state that are necessary for the designated public uses and benefits. If the standards in this chapter are exceeded, it is considered indicative of a polluted condition which is actually or potentially deleterious, harmful, detrimental, or injurious with respect to designated uses or established classes of the waters of the state.
All surface waters are protected for multiple beneficial uses. Numeric water quality standards are tabulated in this part for all uses applicable to four common categories of surface waters, so that all applicable standards for each category are listed together in subparts 3a to 6a. The four categories are:
cold water aquatic life and habitat, also protected for drinking water: classes 1B; 2A, 2Ae, or 2Ag; 3A or 3B; 4A and 4B; and 5 (subpart 3a);
cool and warm water aquatic life and habitat, also protected for drinking water: classes 1B or 1C; 2Bd, 2Bde, 2Bdg, or 2Bdm; 3A or 3B; 4A and 4B; and 5 (subpart 4a);
cool and warm water aquatic life and habitat and wetlands: classes 2B, 2Be, 2Bg, 2Bm, or 2D; 3A, 3B, 3C, or 3D; 4A and 4B or 4C; and 5 (subpart 5a); and
limited resource value waters: classes 3C; 4A and 4B; 5; and 7 (subpart 6a).
Class 1 domestic consumption (DC) standards are the United States Environmental Protection Agency primary (maximum contaminant levels) and secondary drinking water standards, as contained in Code of Federal Regulations, title 40, parts 141 and 143, as amended through July 1, 2006. The DC standards are listed in subparts 3a and 4a, except that individual pollutants, substances, or organisms in the treatment technological, disinfectants, microbiological, and radiological categories are not listed unless they are listed because a secondary drinking water standard or a standard for another use class exists.
Certain drinking water standards are not applicable to class 1 waters. The following are not applicable to class 1 surface waters: the primary drinking water standards for acrylamide, epichlorohydrin, copper, lead, and turbidity (treatment technique standards) and the standards in the disinfectants and microbiological organisms categories. The drinking water standards not applicable to class 1 groundwaters are listed in part 7050.0221.
Class 2 standards for metals are expressed as total metal in subparts 3a to 5a, but must be converted to dissolved metal standards for application to surface waters. Conversion factors for converting total metal standards to dissolved metal standards are listed in part 7050.0222, subpart 9. The conversion factor for metals not listed in part 7050.0222, subpart 9, is one. The dissolved metal standard equals the total metal standard times the conversion factor. Water quality-based effluent limits for metals are expressed as total metal.
The tables of standards in subparts 3a to 6a include the following abbreviations and acronyms:
AN means aesthetic enjoyment and navigation, class 5 waters
* an asterisk following the FAV and MS values or double dashes (–) means part 7050.0222, subpart 7, item G, applies
DC means domestic consumption (drinking water), class 1 waters
– double dashes means there is no standard
exp. () means the natural antilogarithm (base e) of the expression in parenthesis
IC means industrial consumption, class 3 waters
IR means agriculture irrigation use, class 4A waters
LS means agriculture livestock and wildlife use, class 4B waters
(S) means the associated value is a secondary drinking water standard
TH means total hardness in mg/L, which is the sum of the calcium and magnesium concentrations expressed as CaCO3
TON means threshold odor number
When two or more use classes have standards for the same pollutant, the most stringent standard applies pursuant to part 7050.0450. All surface waters are protected for class 6, but this class has no numeric standards so it is not included in the tables.
[Repealed, 24 SR 1105]
Cold water aquatic life and habitat, drinking water, and associated use classes.
Water quality standards applicable to use classes 1B; 2A, 2Ae, or 2Ag; 3A or 3B; 4A and 4B; and 5 surface waters. The water quality standards in part 7050.0222, subpart 2, that apply to class 2A also apply to classes 2Ae and 2Ag. In addition to the water quality standards in part 7050.0222, subpart 2, the biological criteria defined in part 7050.0222, subpart 2d, apply to classes 2Ae and 2Ag.
A. MISCELLANEOUS SUBSTANCE, CHARACTERISTIC, OR POLLUTANT
FAV 1B
DC 3A/3B
IR 4B
(1) Ammonia, un-ionized as N, μg/L
(2) Asbestos, >10 μm (c), fibers/L
-- -- -- 7.0e+06 -- -- -- --
(3) Bicarbonates (HCO3), meq/L
-- -- -- -- -- 5 -- --
(4) Bromate, μg/L
-- -- -- 10 -- -- -- --
(5) Chloride, mg/L
230 860 1,720 250(S) 50/100 -- -- --
(6) Chlorine, total residual, μg/L
11 19 38 -- -- -- -- --
(7) Chlorite, μg/L
-- -- -- 1,000 -- -- -- --
(8) Color, Pt-Co
30 -- -- 15(S) -- -- -- --
(9) Cyanide, free, μg/L
5.2 22 45 200 -- -- -- --
(10) Escherichia (E.) coli bacteria, organisms/100 mL
item D -- -- -- -- -- -- --
(11) Eutrophication standards for lakes and reservoirs (phosphorus, total, μg/L; chlorophyll-a, μg/L; Secchi disk transparency, meters)
See part 7050.0222, subparts 2 and 2a -- -- -- -- -- -- --
(12) Eutrophication standards for rivers, streams, and navigational pools (phosphorus, total μg/L; chlorophyll-a (seston), μg/L; five-day biochemical oxygen demand (BOD5), mg/L; diel dissolved oxygen flux, mg/L; chlorophyll-a (periphyton), mg/m2)
See part 7050.0222, subparts 2 and 2b -- -- -- -- -- -- --
(13) Fluoride, mg/L
-- -- -- 4 -- -- -- --
(14) Fluoride, mg/L
-- -- -- 2(S) -- -- -- --
(15) Foaming agents, μg/L
-- -- -- 500(S) -- -- -- --
(16) Hardness, Ca+Mg as CaCO3, mg/L
-- -- -- -- 50/250 -- -- --
(17) Hydrogen sulfide, mg/L
-- -- -- -- -- -- -- 0.02
(18) Nitrate as N, mg/L
(19) Nitrite as N, mg/L
(20) Nitrate + Nitrite as N, mg/L
(21) Odor, TON
-- -- -- 3(S) -- -- -- --
(22) Oil, μg/L
500 5,000 10,000 -- -- -- -- --
(23) Oxygen, dissolved, mg/L
7, as a
minimum -- -- -- -- -- -- --
(24) pH minimum, su
6.5 -- -- 6.5(S) 6.5/6.0 6.0 6.0 6.0
(25) pH maximum, su
8.5 -- -- 8.5(S) 8.5/9.0 8.5 9.0 9.0
(26) Radioactive materials
item E -- -- See
item E -- See
item E See
item E --
(27) Salinity, total, mg/L
-- -- -- -- -- -- 1,000 --
(28) Sodium, meq/L
-- -- -- -- -- 60% of
cations -- --
(29) Specific conductance at 25°C, μmhos/cm
-- -- -- -- -- 1,000 -- --
(30) Sulfate, mg/L
-- -- -- 250(S) -- -- -- --
(31) Sulfates, wild rice present, mg/L
-- -- -- -- -- 10 -- --
(32) Temperature, °F
increase -- -- -- -- -- -- --
(33) Total dissolved salts, mg/L
-- -- -- -- -- 700 -- --
(34) Total dissolved solids, mg/L
(35) Total suspended solids (TSS), mg/L
See part 7050.0222, subpart 2 -- -- -- -- -- -- --
B. METALS AND ELEMENTS
(1) Aluminum, total, μg/L
87 748 1,496 50-
200(S) -- -- -- --
(2) Antimony, total, μg/L
5.5 90 180 6 -- -- -- --
(3) Arsenic, total, μg/L
2.0 360 720 10 -- -- -- --
(4) Barium, total, μg/L
-- -- -- 2,000 -- -- -- --
(5) Beryllium, total, μg/L
-- -- -- 4.0 -- -- -- --
(6) Boron, total, μg/L
-- -- -- -- -- 500 -- --
(7) Cadmium, total, μg/L
1.1 3.9 7.8 5 -- -- -- --
Class 2A cadmium standards are hardness dependent. Cadmium values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 2, for examples at other hardness values and equations to calculate cadmium standards for any hardness value not to exceed 400 mg/L.
(8) Chromium +3, total, μg/L
207 1,737 3,469 -- -- -- -- --
Class 2A trivalent chromium standards are hardness dependent. Chromium +3 values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 2, for examples at other hardness values and equations to calculate trivalent chromium standards for any hardness value not to exceed 400 mg/L.
(9) Chromium +6, total, μg/L
11 16 32 -- -- -- -- --
(10) Chromium, total, μg/L
-- -- -- 100 -- -- -- --
(11) Cobalt, total, μg/L
2.8 436 872 -- -- -- -- --
(12) Copper, total, μg/L
9.8 18 35 1,000
(S) -- -- -- --
Class 2A copper standards are hardness dependent. Copper values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 2, for examples at other hardness values and equations to calculate copper standards for any hardness value not to exceed 400 mg/L.
(13) Iron, total, μg/L
-- -- -- 300(S) -- -- -- --
(14) Lead, total, μg/L
3.2 82 164 NA -- -- -- --
Class 2A lead standards are hardness dependent. Lead values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 2, for examples at other hardness values and equations to calculate lead standards for any hardness value not to exceed 400 mg/L.
(15) Manganese, total, μg/L
-- -- -- 50(S) -- -- -- --
(16) Mercury, total, in water, ng/L
6.9 2,400* 4,900* 2,000 -- -- -- --
(17) Mercury, total in edible fish tissue, mg/kg or parts per million
0.2 -- -- -- -- -- -- --
(18) Nickel, total, μg/L
158 1,418 2,836 -- -- -- -- --
Class 2A nickel standards are hardness dependent. Nickel values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 2, for examples at other hardness values and equations to calculate nickel standards for any hardness value not to exceed 400 mg/L.
(19) Selenium, total, μg/L
5.0 20 40 50 -- -- -- --
(20) Silver, total, μg/L
0.12 2.0 4.1 100(S) -- -- -- --
Class 2A silver MS and FAV are hardness dependent. Silver values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 2, for examples at other hardness values and equations to calculate silver standards for any hardness value not to exceed 400 mg/L.
(21) Thallium, total, μg/L
0.28 64 128 2 -- -- -- --
(22) Zinc, total, μg/L
106 117 234 5,000
Class 2A zinc standards are hardness dependent. Zinc values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 2, for examples at other hardness values and equations to calculate zinc standards for any hardness value not to exceed 400 mg/L.
C. ORGANIC POLLUTANTS OR CHARACTERISTICS
(1) Acenaphthene, μg/L
20 56 112 -- -- -- -- --
(2) Acetochlor, μg/L
3.6 86 173 -- -- -- -- --
(3) Acrylonitrile (c), μg/L
0.38 1,140* 2,281* -- -- -- -- --
(4) Alachlor (c), μg/L
3.8 800* 1,600* 2 -- -- -- --
(5) Aldicarb, μg/L
-- -- -- 3 -- -- -- --
(6) Aldicarb sulfone, μg/L
-- -- -- 2 -- -- -- --
(7) Aldicarb sulfoxide, μg/L
(8) Anthracene, μg/L
0.035 0.32 0.63 -- -- -- -- --
(9) Atrazine (c), μg/L
3.4 323 645 3 -- -- -- --
(10) Benzene (c), μg/L
5.1 4,487* 8,974* 5 -- -- -- --
(11) Benzo(a)pyrene, μg/L
-- -- -- 0.2 -- -- -- --
(12) Bromoform, μg/L
33 2,900 5,800 See sub-
item (73) -- -- -- --
(13) Carbofuran, μg/L
-- -- -- 40 -- -- -- --
(14) Carbon tetrachloride (c), μg/L
1.9 1,750* 3,500* 5 -- -- -- --
(15) Chlordane (c), ng/L
0.073 1,200* 2,400* 2,000 -- -- -- --
(16) Chlorobenzene, μg/L (Monochlorobenzene)
20 423 846 100 -- -- -- --
(17) Chloroform (c), μg/L
53 1,392 2,784 See sub-
(18) Chlorpyrifos, μg/L
0.041 0.083 0.17 -- -- -- -- --
(19) Dalapon, μg/L
-- -- -- 200 -- -- -- --
(20) DDT (c), ng/L
0.11 550* 1,100* -- -- -- -- --
(21) 1,2-Dibromo-3-chloropropane (c), μg/L
(22) Dichlorobenzene (ortho), μg/L
-- -- -- 600 -- -- -- --
(23) 1,4-Dichlorobenzene (para) (c), μg/L
-- -- -- 75 -- -- -- --
(24) 1,2-Dichloroethane (c), μg/L
3.5 45,050* 90,100* 5 -- -- -- --
(25) 1,1-Dichloroethylene, μg/L
-- -- -- 7 -- -- -- --
(26) 1,2-Dichloroethylene (cis), μg/L
-- -- -- 70 -- -- -- --
(27) 1,2-Dichloroethylene (trans), μg/L
(28) 2,4-Dichlorophenoxyacetic acid (2,4-D), μg/L
(29) 1,2-Dichloropropane (c), μg/L
-- -- -- 5 -- -- -- --
(30) Dieldrin (c), ng/L
0.0065 1,300* 2,500* -- -- -- -- --
(31) Di-2-ethylhexyl adipate, μg/L
-- -- -- 400 -- -- -- --
(32) Di-2-ethylhexyl phthalate (c), μg/L
1.9 --* --* 6 -- -- -- --
(33) Di-n-Octyl phthalate, μg/L
30 825 1,650 -- -- -- -- --
(34) Dinoseb, μg/L
(35) Diquat, μg/L
-- -- -- 20 -- -- -- --
(36) Endosulfan, μg/L
0.0076 0.084 0.17 -- -- -- -- --
(37) Endothall, μg/L
(38) Endrin, μg/L
0.0039 0.090 0.18 2 -- -- -- --
(39) Ethylbenzene (c), μg/L
68 1,859 3,717 700 -- -- -- --
(40) Ethylene dibromide, μg/L
-- -- -- 0.05 -- -- -- --
(41) Fluoranthene, μg/L
1.9 3.5 6.9 -- -- -- -- --
(42) Glyphosate, μg/L
-- -- -- 700 -- -- -- --
(43) Haloacetic acids (c), μg/L (Bromoacetic acid, Dibromoacetic acid, Dichloroacetic acid, Monochloroacetic acid, and Trichloroacetic acid)
-- -- -- 60 -- -- -- --
(44) Heptachlor (c), ng/L
0.10 260* 520* 400 -- -- -- --
(45) Heptachlor epoxide (c), ng/L
0.12 270* 530* 200 -- -- -- --
(46) Hexachlorobenzene (c), ng/L
0.061 --* --* 1,000 -- -- -- --
(47) Hexachlorocyclopentadiene, μg/L
-- -- -- 50 -- -- -- --
(48) Lindane (c), μg/L (Hexachlorocyclohexane, gamma-)
0.0087 1.0* 2.0* 0.2 -- -- -- --
(49) Methoxychlor, μg/L
(50) Methylene chloride (c), μg/L (Dichloromethane)
45 13,875* 27,749* 5 -- -- -- --
(51) Metolachlor
23 271 543 -- -- -- -- --
(52) Naphthalene, μg/L
65 409 818 -- -- -- -- --
(53) Oxamyl, μg/L (Vydate)
(54) Parathion, μg/L
0.013 0.07 0.13 -- -- -- -- --
(55) Pentachlorophenol, μg/L
0.93 15 30 1 -- -- -- --
Class 2A MS and FAV are pH dependent. Pentachlorophenol values shown are for a pH of 7.5 only. See part 7050.0222, subpart 2, for examples at other pH values and equations to calculate pentachlorophenol standards for any pH value.
(56) Phenanthrene, μg/L
3.6 32 64 -- -- -- -- --
(57) Phenol, μg/L
123 2,214 4,428 -- -- -- -- --
(58) Picloram, μg/L
-- -- -- 500 -- -- -- --
(59) Polychlorinated biphenyls (c), ng/L (PCBs, total)
0.014 1,000* 2,000* 500 -- -- -- --
(60) Simazine, μg/L
(61) Styrene (c), μg/L
(62) 2,3,7,8-Tetrachlorodibenzo-p-dioxin, ng/L (TCDD-dioxin)
-- -- -- 0.03 -- -- -- --
(63) 1,1,2,2-Tetrachloroethane (c), μg/L
1.1 1,127* 2,253* -- -- -- -- --
(64) Tetrachloroethylene (c), μg/L
3.8 428* 857* 5 -- -- -- --
(65) Toluene, μg/L
253 1,352 2,703 1,000 -- -- -- --
(66) Toxaphene (c), ng/L
0.31 730* 1,500* 3,000 -- -- -- --
(67) 2,4,5-TP, μg/L (Silvex)
(68) 1,2,4-Trichlorobenzene, μg/L
(69) 1,1,1-Trichloroethane, μg/L
329 2,957 5,913 200 -- -- -- --
(70) 1,1,2-Trichloroethane, μg/L
(71) 1,1,2-Trichloroethylene (c), μg/L
25 6,988 13,976* 5 -- -- -- --
(72) 2,4,6-Trichlorophenol, μg/L
2.0 102 203 -- -- -- -- --
(73) Trihalomethanes, total (c), μg/L (Bromodichloromethane, Bromoform, Chlorodibromomethane, and Chloroform)
-- -- -- 80 -- -- -- --
(74) Vinyl chloride (c), μg/L
0.17 --* --* 2 -- -- -- --
(75) Xylenes, total, μg/L
166 1,407 2,814 10,000 -- -- -- --
Escherichia (E.) coli bacteria shall not exceed 126 organisms per 100 milliliters as a geometric mean of not less than five samples representative of conditions within any calendar month, nor shall more than ten percent of all samples taken during any calendar month individually exceed 1,260 organisms per 100 milliliters. The standard applies only between April 1 and October 31.
For radioactive materials, see parts 7050.0221, subpart 2; 7050.0222, subpart 2; and 7050.0224, subparts 2 and 3.
Cool and warm water aquatic life and habitat, drinking water, and associated use classes.
Water quality standards applicable to use classes 1B or 1C; 2Bd, 2Bde, 2Bdg, or 2Bdm; 3A or 3B; 4A and 4B; and 5 surface waters. The water quality standards in part 7050.0222, subpart 3, that apply to class 2Bd also apply to classes 2Bde, 2Bdg, and 2Bdm. In addition to the water quality standards in part 7050.0222, subpart 3, the biological criteria defined in part 7050.0222, subpart 3d, apply to classes 2Bde, 2Bdg, and 2Bdm.
CS 2Bd
MS 2Bd
FAV 1B/1C
-- -- -- 15(S) -- -- -- --
(11) Eutrophication standards for lakes, shallow lakes, and reservoirs (phosphorus, total, μg/L; chlorophyll-a, μg/L; Secchi disk transparency, meters)
7050.0222,
3 and 3a -- -- -- -- -- -- --
See part 7050.0222, subparts 3 and 3b -- -- -- -- -- -- --
See part 7050.0222, subpart 3 -- -- -- -- -- -- --
9.0 -- -- 8.5(S) 8.5/9.0 8.5 9.0 9.0
item F -- -- -- -- -- -- --
See part 7050.0222, subpart 3 -- --
125 1,072 2,145 50-
1.1 33 67 5 -- -- -- --
Class 2Bd cadmium standards are hardness dependent. Cadmium values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 3, for examples at other hardness values and equations to calculate cadmium standards for any hardness value not to exceed 400 mg/L.
Class 2Bd trivalent chromium standards are hardness dependent. Chromium +3 values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 3, for examples at other hardness values and equations to calculate trivalent chromium standards for any hardness value not to exceed 400 mg/L.
Class 2Bd copper standards are hardness dependent. Copper values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 3, for examples at other hardness values and equations to calculate copper standards for any hardness value not to exceed 400 mg/L.
Class 2Bd lead standards are hardness dependent. Lead values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 3, for examples at other hardness values and equations to calculate lead standards for any hardness value not to exceed 400 mg/L.
(16) Mercury, total in water, ng/L
Class 2Bd nickel standards are hardness dependent. Nickel values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 3, for examples at other hardness values and equations to calculate nickel standards for any hardness value not to exceed 400 mg/L.
1.0 2.0 4.1 100(S) -- -- -- --
Class 2Bd silver MS and FAV are hardness dependent. Silver values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 3, for examples at other hardness values and equations to calculate silver standards for any hardness value not to exceed 400 mg/L.
Class 2Bd zinc standards are hardness dependent. Zinc values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 3, for examples at other hardness values and equations to calculate zinc standards for any hardness value not to exceed 400 mg/L.
IC IC 4A
4.2 800* 1,600* 2 -- -- -- --
6.0 4,487* 8,974* 5 -- -- -- --
41 2,900 5,800 See
(73) -- -- -- --
0.29 1,200* 2,400* 2,000 -- -- -- --
53 1,392 2,784 See
1.7 550* 1,100* -- -- -- -- --
3.8 45,050* 90,100* 5 -- -- -- --
0.026 1,300* 2,500* -- -- -- -- --
0.029 0.28 0.56 -- -- -- -- --
0.016 0.090 0.18 2 -- -- -- --
0.39 260* 520* 400 -- -- -- --
0.48 270* 530* 200 -- -- -- --
0.24 --* --* 1,000 -- -- -- --
0.032 4.4* 8.8* 0.2 -- -- -- --
46 13,875* 27,749* 5 -- -- -- --
81 409 818 -- -- -- -- --
1.9 15 30 1 -- -- -- --
Class 2Bd MS and FAV are pH dependent. Pentachlorophenol values shown are for a pH of 7.5 only. See part 7050.0222, subpart 3, for examples at other pH values and equations to calculate pentachlorophenol standards for any pH value.
0.029 1,000* 2,000* 500 -- -- -- --
1.5 1,127* 2,253* -- -- -- -- --
1.3 730* 1,500* 3,000 -- -- -- --
25 6,988* 13,976* 5 -- -- -- --
0.18 --* --* 2 -- -- -- --
For radioactive materials, see parts 7050.0221, subpart 3; 7050.0222, subpart 3; and 7050.0224, subparts 2 and 3.
Temperature must not exceed five degrees Fahrenheit above natural in streams and three degrees Fahrenheit above natural in lakes, based on monthly average of maximum daily temperature, except in no case shall it exceed the daily average temperature of 86 degrees Fahrenheit.
Cool and warm water aquatic life and habitat and associated use classes.
Water quality standards applicable to use classes 2B, 2Be, 2Bg, 2Bm, or 2D; 3A, 3B, or 3C; 4A and 4B; and 5 surface waters. See parts 7050.0223, subpart 5; 7050.0224, subpart 4; and 7050.0225, subpart 2, for class 3D, 4C, and 5 standards applicable to wetlands, respectively. The water quality standards in part 7050.0222, subpart 4, that apply to class 2B also apply to classes 2Be, 2Bg, and 2Bm. In addition to the water quality standards in part 7050.0222, subpart 4, the biological criteria defined in part 7050.0222, subpart 4d, apply to classes 2Be, 2Bg, and 2Bm.
2B&D
CS 2B&D
MS 2B&D
FAV 3A/3B/3C
(2) Bicarbonates (HCO3), meq/L
(3) Chloride, mg/L
230 860 1,720 50/100/250 -- -- --
(4) Chlorine, total residual, μg/L
11 19 38 -- -- -- --
(5) Cyanide, free, μg/L
5.2 22 45 -- -- -- --
(6) Escherichia (E.) coli bacteria, organisms/100 mL
item D -- -- -- -- -- --
(7) Eutrophication standards for lakes, shallow lakes, and reservoirs (phosphorus, total, μg/L; chlorophyll-a, μg/L; Secchi disk transparency, meters)
4 and 4a -- -- -- -- -- --
(8) Eutrophication standards for rivers, streams, and navigational pools (phosphorus, total μg/L; chlorophyll-a (seston), μg/L; five-day biochemical oxygen demand (BOD5), mg/L; diel dissolved oxygen flux, mg/L; chlorophyll-a (periphyton), mg/m2)
See part 7050.0222, subparts 4 and 4b -- -- -- -- -- -- --
(9) Hardness, Ca+Mg as CaCO3, mg/L
-- -- -- 50/250/500 -- -- --
(10) Hydrogen sulfide, mg/L
-- -- -- -- -- -- 0.02
(11) Oil, μg/L
500 5,000 10,000 -- -- -- --
(12) Oxygen, dissolved, mg/L
4 and 6 -- -- -- -- -- --
(13) pH minimum, su
item E -- -- 6.5/6.0/6.0 6.0 6.0 6.0
(14) pH maximum, su
item E -- -- 8.5/9.0/9.0 8.5 9.0 9.0
(15) Radioactive materials
item F -- -- -- See
item F See
item F --
(16) Salinity, total, mg/L
-- -- -- -- -- 1,000 --
(17) Sodium, meq/L
-- -- -- -- 60% of
(18) Specific conductance at 25°C, μ mhos/cm
-- -- -- -- 1,000 -- --
(19) Sulfates, wild rice present, mg/L
(20) Temperature, °F
item G -- -- -- -- -- --
(21) Total dissolved salts, mg/L
-- -- -- -- 700 -- --
(22) Total suspended solids (TSS), mg/L
See part 7050.0222, subpart 4 -- -- -- -- -- --
125 1,072 2,145 -- -- -- --
31 90 180 -- -- -- --
53 360 720 -- -- -- --
(4) Boron, total, μg/L
-- -- -- -- 500 -- --
(5) Cadmium, total, μg/L
1.1 33 67 -- -- -- --
Class 2B and 2D cadmium standards are hardness dependent. Cadmium values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 4, for examples at other hardness values and equations to calculate cadmium standards for any hardness value not to exceed 400 mg/L.
(6) Chromium +3, total, μg/L
207 1,737 3,469 -- -- -- --
Class 2B and 2D trivalent chromium standards are hardness dependent. Chromium +3 values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 4, for examples at other hardness values and equations to calculate trivalent chromium standards for any hardness value not to exceed 400 mg/L.
(7) Chromium +6, total, μg/L
11 16 32 -- -- -- --
(8) Cobalt, total, μg/L
5.0 436 872 -- -- -- --
(9) Copper, total, μg/L
9.8 18 35 -- -- -- --
Class 2B and 2D copper standards are hardness dependent. Copper values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 4, for examples at other hardness values and equations to calculate copper standards for any hardness value not to exceed 400 mg/L.
(10) Lead, total, μg/L
3.2 82 164 -- -- -- --
Class 2B and 2D lead standards are hardness dependent. Lead values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 4, for examples at other hardness values and equations to calculate lead standards for any hardness value not to exceed 400 mg/L.
(11) Mercury, total in water, ng/L
6.9 2,400* 4,900* -- -- -- --
(12) Mercury, total in edible fish tissue, mg/kg or parts per million
0.2 -- -- -- -- -- --
(13) Nickel, total, μg/L
158 1,418 2,836 -- -- -- --
Class 2B and 2D nickel standards are hardness dependent. Nickel values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 4, for examples at other hardness values and equations to calculate nickel standards for any hardness value not to exceed 400 mg/L.
(14) Selenium, total, μg/L
5.0 20 40 -- -- -- --
(15) Silver, total, μg/L
1.0 2.0 4.1 -- -- -- --
Class 2B and 2D silver MS and FAV are hardness dependent. Silver values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 4, for examples at other hardness values and equations to calculate silver standards for any hardness value not to exceed 400 mg/L.
(16) Thallium, total, μg/L
0.56 64 128 -- -- -- --
(17) Zinc, total, μg/L
106 117 234 -- -- -- --
Class 2B and 2D zinc standards are hardness dependent. Zinc values shown are for a total hardness of 100 mg/L only. See part 7050.0222, subpart 4, for examples at other hardness values and equations to calculate zinc standards for any hardness value not to exceed 400 mg/L.
20 56 112 -- -- -- --
3.6 86 173 -- -- -- --
0.89 1,140* 2,281* -- -- -- --
59 800 1,600 -- -- -- --
(5) Anthracene, μg/L
0.035 0.32 0.63 -- -- -- --
(6) Atrazine (c), μg/L
10 323 645 -- -- -- --
(7) Benzene (c), μg/L
98 4,487 8,974 -- -- -- --
(8) Bromoform, μg/L
466 2,900 5,800 -- -- -- --
(9) Carbon tetrachloride (c), μg/L
5.9 1,750* 3,500* -- -- -- --
(10) Chlordane (c), ng/L
0.29 1,200* 2,400* -- -- -- --
(11) Chlorobenzene, μg/L (Monochlorobenzene)
20 423 846 -- -- -- --
(12) Chloroform (c), μg/L
155 1,392 2,78 -- -- -- --
(13) Chlorpyrifos, μg/L
0.041 0.083 0.17 -- -- -- --
(14) DDT (c), ng/L
1.7 550* 1,100* -- -- -- --
(15) 1,2-Dichloroethane (c), μg/L
190 45,050* 90,100* -- -- -- --
(16) Dieldrin (c), ng/L
0.026 1,300* 2,500* -- -- -- --
(17) Di-2-ethylhexyl phthalate (c), μg/L
2.1 --* --* -- -- -- --
(18) Di-n-Octyl phthalate, μg/L
30 825 1,650 -- -- -- --
(19) Endosulfan, μg/L
0.031 0.28 0.56 -- -- -- --
(20) Endrin, μg/L
0.016 0.090 0.18 -- -- -- --
(21) Ethylbenzene (c), μg/L
68 1,859 3,717 -- -- -- --
(22) Fluoranthene, μg/L
1.9 3.5 6.9 -- -- -- --
(23) Heptachlor (c), ng/L
0.39 260* 520* -- -- -- --
(24) Heptachlor epoxide (c), ng/L
0.48 270* 530* -- -- -- --
(25) Hexachlorobenzene (c), ng/L
0.24 --* --* -- -- -- --
(26) Lindane (c), μg/L (Hexachlorocyclohexane, gamma-)
0.036 4.4* 8.8* -- -- -- --
(27) Methylene chloride (c), μg/L (Dichloromethane)
1,940 13,875 27,749 -- -- -- --
(28) Metolachlor
23 271 543 -- -- -- --
(29) Naphthalene, μg/L
81 409 818 -- -- -- --
(30) Parathion, μg/L
0.013 0.07 0.13 -- -- -- --
(31) Pentachlorophenol, μg/L
5.5 15 30 -- -- -- --
Class 2B and 2D standards are pH dependent, except that the CS will not exceed 5.5 μg/L. Pentachlorophenol values shown are for a pH of 7.5 only. See part 7050.0222, subpart 4, for examples at other pH values and equations to calculate pentachlorophenol standards for any pH value.
(32) Phenanthrene, μg/L
3.6 32 64 -- -- -- --
(33) Phenol, μg/L
123 2,214 4,428 -- -- -- --
(34) Polychlorinated biphenyls (c), ng/L (PCBs, total)
0.029 1,000* 2,000* -- -- -- --
(35) 1,1,2,2-Tetrachloroethane (c), μg/L
13 1,127 2,253 -- -- -- --
(36) Tetrachloroethylene (c), μg/L
8.9 428 857 -- -- -- --
(37) Toluene, μg/L
253 1,352 2,703 -- -- -- --
(38) Toxaphene (c), ng/L
1.3 730* 1,500* -- -- -- --
(39) 1,1,1-Trichloroethane, μg/L
329 2,957 5,913 -- -- -- --
(40) 1,1,2-Trichloroethylene (c), μg/L
120 6,988 13,976 -- -- -- --
(41) 2,4,6-Trichlorophenol, μg/L
2.0 102 203 -- -- -- --
(42) Vinyl chloride (c), μg/L
9.2 --* --* -- -- -- --
(43) Xylenes, total, μg/L
166 1,407 2,814 -- -- -- --
For pH, maintain background. See part 7050.0222, subpart 6.
For radioactive materials, see parts 7050.0222, subpart 4; and 7050.0224, subparts 2 and 3.
Temperature must not exceed:
Class 2B standard: five degrees Fahrenheit above natural in streams and three degrees Fahrenheit above natural in lakes, based on monthly average of maximum daily temperature, except in no case shall it exceed the daily average temperature of 86 degrees Fahrenheit; and
Class 2D standard: maintain background as defined in part 7050.0222, subpart 6.
Limited resource value waters and associated use classes.
A. WATER QUALITY STANDARDS APPLICABLE TO USE CLASSES 3C, 4A, 4B, 5, AND 7 SURFACE WATERS
1R 4B
(1) Bicarbonates (HCO3), meq/L
-- -- 5 -- --
(2) Boron, μg/L
-- -- 500 -- --
-- 250 -- -- --
(4) Escherichia (E.) coli bacteria, organisms/100 mL
See item B -- -- -- --
(5) Hardness, Ca+Mg as CaCO3, mg/L
-- 500 -- -- --
(6) Hydrogen sulfide, mg/L
-- -- -- -- 0.02
(7) Oxygen, dissolved, mg/L
(8) pH minimum, su
(9) pH maximum, su
9.0 9.0 8.5 9.0 9.0
(10) Radioactive materials
-- -- See item D See item D --
(11) Salinity, total, mg/L
-- -- -- 1,000 --
(12) Sodium, meq/L
-- -- 60% of
(13) Specific conductance at 25°C, μmhos/cm
-- -- 1,000 -- --
(14) Sulfates, wild rice present, mg/L
-- -- 10 -- --
(15) Total dissolved salts, mg/L
-- -- 700 -- --
(16) Toxic pollutants
See item E -- -- -- --
Escherichia (E.) coli bacteria shall not exceed 630 organisms per 100 milliliters as a geometric mean of not less than five samples representative of conditions within any calendar month, nor shall more than ten percent of all samples taken during any calendar month individually exceed 1,260 organisms per 100 milliliters. The standard applies only between May 1 and October 31.
The level of dissolved oxygen must be maintained at concentrations:
that will avoid odors or putrid conditions in the receiving water;
at not less than one milligram per liter (daily average); and
above zero milligrams per liter at all times.
For radioactive materials, see part 7050.0224, subparts 2 and 3.
Toxic pollutants shall not be allowed in such quantities or concentrations that will impair the specified uses.
Site-specific modifications of standards.
The standards in this part and in parts 7050.0221 to 7050.0227 are subject to review and modification as applied to a specific surface water body, reach, or segment. If site-specific information is available that shows that a site-specific modification is more appropriate than the statewide or ecoregion standard for a particular water body, reach, or segment, the site-specific information shall be applied.
The information supporting a site-specific modification can be provided by the commissioner or by any person outside the agency. The commissioner shall evaluate all relevant data in support of a modified standard and determine whether a change in the standard for a specific water body or reach is justified.
Any effluent limit determined to be necessary based on a modified standard shall only be required after the discharger has been given notice of the specific proposed effluent limits and an opportunity to request a hearing as provided in part 7000.1800.
Through the procedures established in items A to C, the following site-specific reservoir eutrophication standards apply to Lake Pepin (25-0001-00) in lieu of the water quality standards listed in this part and part 7050.0222:
(1) Phosphorus, total μg/L less than or equal to 100
(2) Chlorophyll-a (seston) μg/L less than or equal to 28
9 SR 913; 12 SR 1810; 15 SR 1057; 18 SR 2195; 24 SR 1105; 24 SR 1133; 32 SR 1699; 39 SR 154; 42 SR 441