United States
Environmental Protection
Agency
Office of Water
Regulations and Standards
Washington, DC 20460
Water
>EPA Dissolved Oxygen
EPA 4*0/538/024
September 1988
Q/
s:
cy
O/
Water Quality Standards
Criteria Summaries:
A Compilation
of State/Federal Criteria
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DISCLAIMEF
th. I?1** P"*11"*10" was prepared by Battelle under contract to
£?„ 2 Environmental Protection Agency (Contract 68-03-3534)
oecondarv i nf «»i»ia+-i«»» _x>..__^_ .. .«_ .. . * / •
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n tH lnformation "ources were used to compile data presented
and £i do,cu«<«nt. Each State was given an opportunity to review
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no event shall either the United States or Battelle have anv
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ne aes or Battelle have anv
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consult the wate^ quality standards of a
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Agency or
Additional information may also be obtained from the:
Standards Branch
Criteria and Standards Division (WH-585)
Office of Water Regulations and Standards
U.S. Environmental Protection Agency
Washington, D.C. 20460
202-475-7315
This document may be obtained only from the National Technical
Information Service (NTIS) at the following address:
National Technical Information Service
5285 Front Royal Road
Springfield, Virginia 22161
703-487-4650
The NTIS order number is:
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INTRODUCTION
This digest is compiled to provide general information to the public as well
as to Federal, State, and local officials. It contains excerpts from the
individual Federal-State water quality standards establishing pollutant
specific criteria for interstate surface waters. The water quality standards
program is implemented by the U. S. Environmental Protection Agency where
responsibility for providing water quality recommendations, approving
State-adopted standards for interstate waters, evaluating adherence to the
standards, and overseeing enforcement of standards compliance, has been
mandated by Congress.
Standards, a nationwide strategy for surface water quality management, contain
three major elements: the use (recreation, drinking water, fish and wildlife
propagation, industrial, or agricultural) to be made of the navigable water;
criteria to protect these uses; and an antidegradation statement to protect
existing high quality waters, from degradation by the addition of pollutants.
Guidance for the development of standards by individual States is contained in
two EPA documents entitled Water Quality Standards Handbook (1983) and Quality
Criteria for Water (1986).
Waters classified for the protection and propagation of fish and wildlife must
contain sufficient dissolved oxygen to support aquatic life. Dissolved oxygen
water quality criteria, the subject of this digest, are established so as to
maintain a desirable, or good, fish population at all life-development stages.
This is achieved by assuring that the dissolved oxygen concentrations do not
fall below a certain minimum level which must be maintained throughout the
range of varying natural conditions.
Reduced concentrations of dissolved oxygen can lead to detrimental effects
such as taste and odors in waters, and limit the kinds of numbers of fish and
other aquatic life present. To prevent these conditions the 1986 Quality
Criteria for Water recommends the following aerobic conditions in the water
column and, except as affected by natural phenomena, at the sediment-water
interface.
Coldwater Criteria Warmwater Criteria
Early Life Other Life Early Life Other Life
Stages ' Stages Stages Stages
30 Day Mean
7 Day Mean
7 Day Mean
minimum
NA3
9.5 (6.5)
NA
6.5
NA
5.0
NA
6.0
NA
5.5
NA
4.0
1 Day Mean4'5 8.0 (5.0) 4.0 5.0 3.0
minimum
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1 These are vater column concentrations recommended to achieve the required
intergravel dissolved oxygen concentrations shown in parentheses, the 3
mg/L differential is discussed in the criteria document. For species that
have early life stages exposed directly to the vater column, the figures in
parentheses apply.
2 Includes all embryonic and larval stages and all juvenile forms to 30-days
following hatching.
3 NA (not applicable).
4 For highly manipulatable discharges, further restrictions apply (see page
37)
5 All minima should be considered as instantaneous concentrations to be
achieved at all times.
Since water quality standards are revised from time to time, following
procedures set forth in the Clean Vater Act, individual entries in this digest
may be superseded. This digest will be updated periodically.' Because this
publication is intended for use only as a general information reference, the
reader needs to refer to the current approved water quality standards to
obtain the latest information for special purposes and applications. These
can be obtained from the State vater pollution control agencies or the EPA
Regional Offices.
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REFERENCES
5 California Water Quality Standards by River Basins, ca. 1975.
9 Florida Administrative Code, Chapter 17-4, 1987 and Florida Administrative
Code, Chapter 17-3, 1988.
13 Illinois Pollution Control Board, Board Order R87-27, 1988
19 Maine Vater Classification Program, Maine Revised Statutes Annotated,
Title 38, Article 4-A, State of Maine Department of Environmental
Protection, May 1987.
27 Nebraska Water Quality Standards, Title 117, Chapter 1, Nebraska
Department of Envronmental Control.
31 Water Quality Standards for Interstate and Intrastate Streams in New
Mexico, State of Nev Mexico Water Quality Control Commission, 1988.
35 Ohio Water Quality Standards, Chapter 3745-1 of the Administrative Code,
Ohio Environmental Protection Agency, 1985.
42 Tennessee's Water Quality Criteria and Stream Use Classifications for
Interstate and Intrastate Streams, Tennessee Water Quality Control Board:
Department of Health and Environment, 1987.
43 Texas Surface Water Quality Standards, Texas Water Commission, Rule
Change, 1988.
44 Utah Standards of Quality for Waters of the State, Wastewater Disposal
Regulations: Part II, State of Utah Department of Health: Division of
Environmental Health, 1988.
45 Vermont Water Quality Standards, State of Vermont Water Resource Board,
1987.
48 Water Quality Standards, West Virginia Legislative Rules, State Water
Resources Board, 1985.
51 Water Quality Standards for American Samoa, 1984, pp. 20, 24-25.
52 Department of Consumer and Regulatory Affairs, Chapter 42-Water Quality
Standards of the District of Columbia, Section 4206.1.
53 Revised Guam Water Quality Standards, Guam Environmental Protection
Agency, 1984, p. 9.
54 Commonwealth of Northern Mariana Islands Marine and Fresh Vater Quality
Standards, Commonwealth Register, Vol. 8 No. 5, 1Q86, p.
56 Trust Territories, Title 63, Chapter 13, Subchapter VII, Marine and Fresh
Water Quality Standard Regulations, 1986, pp. 6-7.
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57 Water Quality Standards for Coastal Waters of the Virgin Islands, Title
12, Chapter 7. Subchapter 186, 1985, pp. 263-265.
ENVIRONMENT REPORTER. The Bureau of National Affairs, Inc. Washington, D.C.
20037
1 Pages 701:1003-1010, September 5, 1980
2 Page 706:1003, November 7, 1986
3 Page 711:1018, February 7, 1986
4 Pages 716:1004-1005, August 30, 1985
6 Page 726:1009, August 22, 1986
7 Pages 731:1004-1008, May 14, 1986
8 Pages 736:1007-1010, March 28, 1986
9 Pages 746:1010.2--1014, September 5, 1986
11 Pages 756:1003-1008, September 20, 1985
12 Pages 761:1026-1027, January 23, 1987
14 Pages 771:1003-1004, August 10, 1984
15 Page 776:1005, February 13, 1987
16 Page 781:1011, March 27, 1987
17 Pages 786-1008-1009, November 29, 1985
18 Page 791:1007, January 18, 1985
20 Pages 801:1002-1003, April 19, 1985
21 Pages 806:1002-1003, June 21, 1985
22 Pages 811:1004-1006, February 13, 1987
23 Pages 816:1006-1008, June 25, 1982
24 Pages 821:1002-1004, October 25, 1985
25 Pages 826:1009-1010, June 21, 1985
26 Pages 831:1004-1009, April 19, 1985
28 Pages 841:1001-1011, February 22, 1985
29 Page 846:1004, October 5, 1984
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30 Page 851:1012, April 11, 1986
32 Pages 861:1008-1012, November 29, 1985
33 Page 866:1009, August 29, 1986
34 Pages 871:1003-1004, June 7, 1985
36 Page 881:1004, September 26, 1986
37 Page 886:1005, May 9, 1986
38 Page 891:1006, August 9, 1985
39 Pages 901:1002-1004, August 9, 1985
40 Pages 906:1006-1009, November 29, 1985
41 Pages 911:1005-1006, March 22, 1985
46 Page 936:1002, February 28, 1986
47 Pages 941:1003-1005, October 21, 1983
49 Page 951:1002, December 19, 1986
50 Page 956:1005, July 5, 1985
55 Pages 896:1003-1004, December 23, 1983
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State Designated Use and Criteria Value
Alabama Public Water Supply, Swimming and Other Whole Body
Water-Contact Sports, Shellfish Harvesting, and Pish
and Wildlife. For a diversified warm vater biota,
including game fish, daily dissolved oxygen
concentrations shall not be less than 5 mg/1 at all
tines; except under extreme conditions due to natural
causes, it may range between 5 mg/1 and 4 mg/1,
provided that the vater quality is favorable in all
other parameters. The normal seasonal and daily
fluctuations shall be maintained above these levels.
In no event shall the DO level be less than 4 mg/1 due
to discharges from existing impoundments. All new
impoundments shall be designed so that the discharge
will contain at least 5 mg/1 DO where practicable and
technologically possible. The EPA, in cooperation
with the State of Alabama and parties responsible for
impoundments, shall develop a program to improve the
design of existing facilities.
In coastal waters surface DO concentrations shall not
be less than 5 mg/1, except where natural phenomena
cause the value to be depressed.
In estuaries and tidal tributaries, DO concentrations
shall not be less than 5- mg/1, except in dystrophic
waters or where natural conditions cause the value to
be depressed.
In the application of DO criteria referred to above,
DO shall be measured at a depth of 5 feet in waters 10
feet or greater in depth; and for those waters less
than 10 feet in depth, DO criteria will be applied at
mid-depth.
Agricultural and Industrial Vater Supply, Industrial
Operations. Sewage, industrial wastes, or other
wastes shall not cause the DO to be less than 3.0 ppm.
In the application of DO criteria referred to above,
DO concentration shall be measured at a depth of 5
feet in waters 10 feet or greater in depth; and for
those waters less than 10 feet in depth, DO criteria
will be applied at mid-depth.
Navigation. Sewage, industrial wastes, or other
wastes shall not cause the DO to be less than 2.0 ppm.
In the application of DO criteria referred to above,
DO concentration shall be measured at a depth of 5
feet in waters 10 feet or greater in depth: and for
those waters less than 10 feet in depth, DO criteria
will be applied at mid-depth.
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Designated Use and Criteria Value
California (1) Kla»ath Rive*Basin, North Coastal Basin.
Dissolved oxygen concentrations shall not be reduced
belov the following minimum levels at any time:
Waters designated WARM, MAR, or SAL .. 5.0 mg/1
Waters designated COLD ; g Q mg/1
Waters designated SPWN 7.0 mg/i
Waters designated SPWN during critical spawning and
egg incubation periods 9.0 mg/1
(2) San Francisco Bay Basin
For all tidal waters, the following minimums shall
apply:
In the Bay downstream of Carquinez Bridge 5.0 mg/1
Upstream from Carquinez Bridge 7.0 mg/1
For nontidal waters, the following minimums shall
apply:
Waters designated as cold water habitat 7.0 mg/1
Waters designated as warm water habitat 5.0 mg/1
(3) Central Coastal Basin
Objectives for inland surface waters, enclosed bays
and estuaries.
The dissolved oxygen concentration shall not be
reduced below the following minimum values at any time:
Water designated AGR, excluding GWR 2.0 mg/1
WARM 5.0 mg/1
SPWN, MAR, or COLD 7.0 mg/1
(4a) Santa Clara tdver Basin
The mean annual dissolved oxygen concentration shall
be greater than 7 parts per million (pom), provided
that no single determination shall be less than 5.0
ppm, except vhen natural conditions cause lesser
concentrations. Additionally. for cold surface
streams and cold water spawning streams the dissolved
1 oxygen content shall not fall belov 6.0 and 7.0 mg/1
respectively, as the result of waste discharges.
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State Designated Use and Criteria Value
(4b) Los Angeles River Basin
Objectives for inland surface waters, enclosed bays
and estuaries.
Dissolved oxygen shall not fall below 5.0 mg/1 at any
time as the result of waste discharges; when natural
factors cause lesser concentrations, then controllable
water quality factors shall not cause further
reduction.
For that area known as the outer harbor area of the
Los Angeles-Long Beach Harbors, the mean annual
dissolved oxygen concentrations shall be 6.0 mg/1 or
greater, provided that no single determination shall
be less than 5.0 mg/1. When natural conditions cause
lesser concentrations, then controllable water quality
factors shall not cause further reduction.
Additionally, fpr cold surface streams and cold water
spawning streams the dissolved oxygen content shall
not fall below 6.0 and 7.0 mg/1, respectively.
(5a,b,c) Sacramento-San Joaquin Delta
This includes water quality objectives that apply to
all inland surface waters (excluding the Delta) of the
basins, and objectives that apply only to specific
surface water bodies.
The monthly median of the" mean daily dissolved oxygen
concentration shall not fall below 85 percent of the
saturation in the main water mass and the 95
percentile concentration shall not fall below 75
percent of saturation. The dissolved oxygen
concentrations shall not be reduced below the
following minimum levels at any time:
- Waters designated WARM 5.0 mg/1
- Waters designated COLD 7.0 mg/1
- Vaters designated SPVN 7.0 mg/1
The following objectives apply to the water bodies
specified. To the extent of any conflict vith the
above, the more stringent objective applies. The
dissolved oxygen concentrations:
Sacramento River, Shasta Dam to Eye Street
Bridge. Shall be maintained at or near established
seasonal levels from Kesvick Dam to Eye Dam to Eye
Street Bridge Street Bridge.
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Designated Use and Criteria Value
Sacramento River, Shasta Dam to Colusa Basin
Drain. Shall be greater than or equal to 9.0 mg/1 from
Keswick Dam to Hamilton City from 1 June to 31 August.
When natural conditions lower the dissolved oxygen
below this level, the concentration shall be
maintained at or above 95 percent of the saturation.
Sacramento River, Shasta Dam to Eye Street
Bridge. Shall be greater than or equal to 7.0 mg/1
from Hamilton City to Eye Street Bridge Dam to Eye
Street Bridge from 1 June to 31 August.
Lake Natoma. Shall be greater than or equal to
7.0 mg/1 all year.
Feather River, Fish Barrier Dam to Sacramento
River. Shall be greater than or equal to 8.0 mg/1 from
Oroville Fish Barrier to Honcut Creek from 1 September
to 31 May.
Merced River, Source to McClure Lake. Shall be
greater than or equal to 8.0 mg/1 from Cressey to New
Exchequer Dam at all times.
Tuolumne River, Don Pedro Dam to San Joaquin
River. Shall be greater than or equal to 8.0 mg/1
from Waterford to La Grange from 15 October to 15
June.
The following specific numeric objectives apply to the
waters of the Sacramento-San Joaquin Delta. All
waters lying within the legal boundaries of the Delta
are covered by these objectives unless otherwise
specified.
The following objectives apply to indicated Delta
waters: The dissolved oxygen concentration shall not
be reduced below the following levels:
- 7.0 mg/1 in the Sacramento River and in all
Delta waters west of the Antioch Bridge.
- 5.0 mg/1 in all other Delta waters with the
following exception: In certain bodies of water which
are constructed for special purposes and from which
fish have been excluded on the fishery is not
important as a beneficial use.
(5D) Tulare Lake Basin
The dissolved oxygen content in all surface waters of
the Basin, as a result of controllable water quality
factors, shall not be reduced, at any time, below the
following minimum concentrations:
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State Designated Use and Criteria Value
Waters designated VARM ' 5.0 mg/1
Waters designated COLD or SPWN 7.0 mg/1
Waste discharges shall not cause median dissolved
oxygen concentrations in the main water mass (at
centroid of flow) of streams and above the thermocline
in lakes to fall below 85 percent of saturation
concentration, and the 95 percentile concentration to
fall below 75 percent of saturation concentration.
Additionally, dissolved oxygen at any location shall
not fall below 5 mg/1 or the minimum value shown in
Table 4-2, whichever is greater.
(6A) North Lahontan Basin
The dissolved oxygen concentration, in terms of
percent saturation, shall not be depressed by more
than 10 percent, nor shall the minimum dissolved
oxygen concentration at any time be less than the
following limits, whichever is more restrictive.
Waters designated WARM 5.0 nig/1
Waters designated COLD 7.0 mg/1
(6B) South Lahontan Basin •
The dissolved oxygen .concentrations, in terms of
percent saturation, shall not be depressed by more
than 10 percent, nor shall the minimum, dissolved
oxygen concentration at any time be less than 80
percent of saturation of less than the following
limits, whichever is more restrictive:
Waters designated WARM 5.0 mg/1
Waters designated COLD 7.0 mg/1
(7A) West Colorado River Basin
As a result of controllable water quality factors, the
dissolved oxygen concentration shall not be reduced
below the following minimum levels at any time:
Waters designated WARM or SAL 5.0 mg/1
Waters designated COLD 7.0 mg/1
When natural factors cause lesser concentrations,
controllable water quality factors shall not cause
further reduction.
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State Designated Use and Criteria Value
(7B) East Colorado River Basin
As a result of controllable water quality factors, the
dissolved oxygen concentration shall not be reduced
belov the following minimum levels at any time:
Colorado River (entire reach) 6.0 mg/1
Other waters designated WARM 5.0 mg/1
Other waters designated COLD 7.0 mg/1
Where natural factors cause lesser concentrations,
controllable water quality factors shall not cause
further reduction.
(8) Santa Ana River River Basin
(1) Within Bay water in general, tidal prisms of San
Gabriel River, and flood control channels:
As a result of waste discharges, the mean annual
dissolved oxygen concentration shall not be less than
5.0 mg/1 nor shall the minimum dissolved oxygen
concentration be below 5.0 mg/1 at any time.
(2) Within dead-end channels in Newport Bay (channels
west of Newport Boulevard and channel west of Lido
Peninsula)," tidal prism of Santa Ana River, and
Newport Shores Marina:
The dissolved oxygen concentration shall be greater
than 4 mg/1 provided that not more than 20Z of the
samples collected at any station during any quarter
shall be less than 4 mg/1 and provided further that no
single sample shall be less than 3 mg/1.
(3) Inland surface water (including rivers, streams,
lakes and reservoirs):
The median dissolved oxygen concentration shall not
fall below 85% of saturation in main water mass and
the 95 percentile concentration shall not fall belov
75-» of saturation; dissolved oxygen at any location
shall not fall below 5 mg/1 for waters designated WARM
or 6 mg/1 for waters designated COLD.
(9) San Diego Basin
Dissolved oxygen levels shall not be less than 5.0
mg/1 in inland surface waters vith designated MAR or
WARM beneficial uses or less than 6.0 mg/1 in waters
vith designated COLD beneficial uses. The annual mean
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State
Designated Use and Criteria Value
dissolved oxygen concentration shall not be less than
7 fflg/1 more than 102 of the time.
Estuarine vaters - a min. of 5 mg/1 for most waters,
minimum of 6 and 7 mg/1 for other vaters.
Coastal vaters - a min. of 5 mg/1 vith additional
limits on the annual mean average which ranges from 6
to 7 mg/1.
Colorado
Recreational Classes 1 and 2, and Agriculture.
3.0 mg/1
Drinking Water Supply. 3.0 mg/1. Aerobic
(2)
(2)
Aquatic Life Class 1, Cold Water Biota. 6.0 mg/1
7.0 mg/1 (spawning)
Aquatic Life Class 1, Warm Water Biota. 5.0 mg/1
Aquatic Life Class 2. Established on a case-by-case
basis.
(1) Standards for dissolved oxygen are 1-day minima,
unless specified otherwise. For the purposes of
permitting, dissolved oxygen may be modeled for
average conditions of temperature and flow'for the
vorst case time period. Where dissolved oxygen levels
less than these levels occur naturally, a discharge
shall not cause a further reduction in dissolved
oxygen in receiving water.
(2) A 7.0 mg/1 standard (minimum), during periods of
spawning of cold water fish, shall be set on a
case-by-case basis as defined in the NPDES permit for
those dischargers whose effluent would affect fish
spawning.
Connecticut
Inland Waters:
Classes AA, A, B. Not less than 5.0 mg/1 at any time.
Class C. Not less than 4.0 mg/1 at ainy time.
Coastal and Marine Waters:
Class SA. Not less than 6.0 mg/1 at any time.
Class SB. Not less than 5.0 mg/1 at any time.
Class SC. Not less than 4.0 mg/1 at any time.
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State
Delaware*
8
Designated Use and Criteria Value
General criteria for freshwater streams. Average 00
shall be 5.5 mg/1 with minimum of 4.0 mg/1.*
Cold Water Fisheries. Average DO shall be 6.5 mg/1
vith a minimum of 4.0 mg/1.
General criteria for saltwater streams. Average DO
shall .be 5.0 mg/1 vith minimum of 4.0 mg/1.*
Delaware River (PA-DE line, RM 78.8 to Liston Point,
RM 48.2). During 4/1 - 6/1, and 9/16 - 12/31,
seasonal average concentration shall not be less than
6.5 mg/1 in the entire zone. At no time shall the
daily average concentration be less than 3.5 mg/1 at
RM 78.8, 4.5 mg/1 at RM 70.0, and 6.0 mg/1 at RM 59.5.
Lewes-Rehoboth Canal. Shall not be less than an
average value of 3.0 mg/1, nor go below a minimum of
2.0 mg/1 at any time.
Waters of Exceptional Recreational or Ecological
Significance (ERES Vaters). In cases where natural
conditions preclude attainment of dissolved oxygen
criteria, reduction in dissolved oxygen levels as a
result of human activities shall be prohibited.
* In cases where natural conditions preclude
attainment of these criteria, allowable reduction in
DO levels as a result of human activities shall be
determined through application of the requirements of
Section 2 of these Standards.
Florida5
Class I, Potable Water Supply.
5 mg/1. *
Shall not be less than
Class II, Shellfish Propagation or Harvesting. The
concentration in -all waters shall not average less
than 5 mg/1 in a 24-hour period and shall never be
less than 4 mg/1. *
Class III, Recreation, Fish and Wildlife. In
predominantly fresh waters, the concentration shall
not be less than 5 mg/1. In predominantly marine
waters, the concentration shall not average less than
5 mg/1 in a 24-hour period and never less than 4 mg/1.*
Class IV, Agricultural Supplies. Shall not average
less than 4.0 mg/1 in a 24-hour period and shall never
be depressed below 3-0 mg/1.
Class V, Navigation, Utility and Industrial Use.
Shall not be less than 0.3 mg/L 50 % of the time on an
annual basis for flows >§250 cfs and shall never be
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State
Designated Use and Criteria Value
less than 0.1 mg/L.*
* Normal daily and seasonal fluctuations above this
level shall be maintained.
Georgia
10
Drinking Water Supplies, Recreation, Fishing:
Trout streams. Daily average of 6.0 mg/1 and no less
than 5.0 mg/1 at all times.
Var» vater fisheries. Daily average of 5.0 mg/1 and
no less than 4.0 mg/1 at all times.
Agricultural, Industrial, Navigational, and Urban
Streaa Uses. No less than 3.0 mg/1 at any time.
Hawaii
11
Streams. Not less than 80Z saturation.
Estuaries:
All except Pearl Harbor. Not less than 75X saturation.
Pearl Harbor. Not less than 60* saturation.
BBbavaents, Open Coastal and Oceanic Waters. Not less
than 75X saturation.
Idaho
12
Van Vater Biota.
at all times. *
DO concentrations exceeding 5 mg/1
Cold Vater Biota. DC concentrations exceeding 6 mg/1
at all times. *
Salaonid Spawning. DO concentrations exceeding 6 mg/1
or 90% of saturation, whichever is greater.
* In .lakes and reservoirs this standard does not
apply to (i) the bottom 20Z of water depth in natural
lakes and reservoirs where depths are 35 meters or
less. (ii) the bottom 7 meters of water depth in
natural lakes and reservoirs where depths are greater
than 35 meters, (iii) those waters of the hypolimnion
in stratified lakes and reservoirs.
Illinois
13
General Use. DO (STORE! number 00300) shall not be
less than 6.0 mg/1 during at least 16 hours of any 24
hour period, nor less than 5.0 mg/1 at any time.
Secondary Contact and Indigenous Aquatic Life. DO
fSTORET number 00300) shall not be less than 4.0 mg/1
at any time except that the Calumet-sag channel shall
not be less than 3.0 mg/L at any time.
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State
Designated Use and Criteria Value
Lake Michigan.
less than 90*
causes.
DO (STORE! number 00300) shall not be
of saturation except due to natural
Indiana
14
lova
15
Warm Water Pish.
calendar day and
any time.
Shall average at least 5.0 mg/1 per
shall not be less than 4.0 mg/1 at
Cold Water Fish.
(a) In those waters designated by the Indiana
Department of Natural Resources for put-and-take trout
fishing, DO concentration shall not be less than 6.0
mg/1 at any time or place.
(b) Spawning Areas (during the spawning season) shall
be protected during the spawning by a minimum DO
concentration of 7.0 mg/1.
Class B.
(1) DO shall not be less than 5.0 mg/1 during at least
16 hours of any 24-hour period and not less than 4.0
mg/1 at any time during the 24-hour period.
(2) Cold Water Fisheries. DO shall not be less than
7.0 mg/1 during at least 16 hours of any 24-hour
period and not less-than 5.0 mg/1 at any time during
the 24-hour period.
Kansas
16
Kentucky
17
Aquatic Life Use. DO shall not be lowered belov 5.0
mg/1 by the influence of artificial sources.
Varwater Aquatic Habitat.
(1) DO shall be maintained at a minimum concentration
of 5 mg/1 daily average and at no time should the
instantaneous minimum be less than 4 mg/1.
(2) The DO concentration shall be measured at
mid-depth in waters having a total depth of 10 feet or
less and at representative depths in other waters.
Coldwater Aquatic Habitat.
(1) A minimum concentration of 6 mg/1 as a daily
average and 5 mg/1 as an instantaneous minimum shall
be maintained at all times.
(2) In impoundments vhich support trout. the
concentration of dissolved oxygen in waters belov the
epilimnion shall be kept consistent with natural water
quality.
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Designated Use and Criteria Value
Louisiana111 The following dissolved oxygen (DO) values represent
minimum values for the type of water specified. For
short periods of time in freshwater, a nocturnal
(nightly) variation below the standard specified may
occur. This accommodates the natural reduction in
photosynthetic activity and oxygen production by
plants that occurs during hours of darkness. However,
no waste discharge or activity of man shall lower the
dissolved oxygen concentration to the point where the
variation falls below the specified minimum.
Fresh Vater. For a diversified population of
warmwater biota including sport fish, the daily
(daytime) DO concentration shall be at/or above 5
mg/1 assuming normal seasonal and daily variations are
above this concentration. Individual measurements may
range between 5 and 4 mg/1 for short nocturnal
(nighttime) periods, not to exceed eight hours. These
values shall apply except where the Office determines
that dystrophic waters exist or where otherwise
provided for in these standards.
Estuaries and Tidal Tributaries. DO.concentrations
shall not be less than 4 mg/1 at any time except where
natural conditions cause levels to be lower or where
otherwise provided for in these standards.
Coastal Marine Waters (Nearshore Gulf of Mexico). DO
concentrations in surface coastal waters shall not be
less than 5 mg/1 except when upwellings and other
natural phenomena cause this value to be lower.
For criteria specific segments, see SNA Environment
Reporter pages 791:1021 - 1056.
Maine19 Class AA, SA. The DO content shall be as naturally
occurs.
Class A. The DO content shall be not less than 7
parts per million (mg/1) or 752 of saturation,
whichever is higher.
Class B. The DO content shall be not less than 7
parts per million or 752 of saturation, whichever is
higher, except that for the period from October 1st to
May 14th, in order to ensure spawning and egg
incubation of indigenous fish species, the 7-day mean
DO concentration shall not be less than 9.5 ppm and
the 1-day minimum shall not be less than 8.0 ppm in
identified fish spawning areas.
-18-
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State
Designated Use and Criteria Value
Class C. The Dp content shall be not less than 5 ppm
or 60% of saturation, whichever is higher, except that
in identified salmonid spawning areas where water
quality is sufficient to ensure spawning, egg
incubation and survival of early life stages, that
water quality sufficient for these purposes shall be
maintained.
Class SB. The DO content shall be not less than 85*
of saturation.
Class SC. The DO content shall be not less than 70%
of saturation.
Maryland
20
Classes I, II, IV. The dissolved oxygen concentration
may not be less than 5.0 mg/1 at any time.
Class III. The dissolved oxygen concentration may not
be less than 5.0 mg/1 at any time, with a minimum
daily average of not less than 6.0 mg/1.
Massachusetts
21
Classes A, B, C. Shall be a minimum of 5.0 mg/1 in
warm water fisheries and a minimum of 6.0 mg/1 in cold
water.fisheries.
Class SA, SB, SC.
saturation
shall be a minimum of 6.0 mg/1 at water temperatures
Shall be a minimum of 85 percent of
at water temperatures above 77°F (25°C) and
of 77°F (25°C) and below.
Michigan
22
R 323.1064. Great Lakes, connecting waters, and inland
streams. Rule 64.
(1) A minimum of 7 mg/1 of dissolved oxygen (DO) in
all Great Lakes and connecting waterways shall be
maintained, and, except for inland lakes as prescribed
in R 323.1065, a minimum of 7 mg/1 of DO shall be
maintained at all times in all inland waters
designated by these rules to be protected for
coldwater fish. In all other waters, except for
inland lakes as prescribed by R 323.1065, a minimum of
5 mg/1 of DO shall be maintained. These standards do
not apply for a limited warmwater fishery use
subcategory established pursuant to R 323.1100(10) or
during those periods when the standards specified in
subrule (2) of this rule apply.
(2) Waters of the state vhich do not meet the
standards set forth in subrule (1) of this rule shall
be upgraded to meet those standards. For existing
point source discharges to these vaters, the
commission may issue permits pursuant to R 323.2145
-19-
-------
State Designated Use and Criteria Value
which establish schedules to achieve the standards set
forth in subrule (1) of this rule. If existing point
source dischargers demonstrate to the commission that
the dissolved oxygen standards specified in subrule
(1) of this rule are not attainable through further
feasible and prudent reductions in their discharges or
that the diurnal variation between the daily averages
and daily minimum DO concentrations in those waters
exceeds 1 mg/1, further reductions in oxygen-consuming
substances from such discharges will not be required,
except as necessary to meet the interim standards
specified in this subrule, until comprehensive plans
to upgrade these waters to the standards specified in
subrule (1) of this rule have been approved by the
commission and orders, permits, or other actions
necessary to implement the approved plans have been
issued by the commission. In the interim, all of the
following standards apply:
(a) For waters of the state designated for use
for coldwater fish, except for inland lakes, the
dissolved oxygen shall not be lowered below a minimum
of 6 mg/1 at the design flow during the warm weather
season in accordance with R 323.1090(3) and (4). At
the design flows during other seasonal periods, as
provided in R 323.1090<4), a minimum of 7 mg/1 shall
be maintained. At flows greater than the design
flows, DO shall be higher than the respective minimum
values specified in this subdivision.
(b) For waters of the state designated for use
for varmwater fish and other aquatic life, except for
inland lakes as prescribed in R 323.1065, the DO shall
not be lowered below a minimum of 4 mg/1, or below 5
mg/1 as a daily average, at the design flow during the
warm weather season in accordance with R 323.1090(3)
and (4). At the design flows during other seasonal
periods as provided in R 323.1090(4), a minimum of 5
mg/1 shall be maintained. At flows greater than the
design flows, DO shall be higher than the respective
minimum values specified in this subdivision.
(c) For waters of the state designated for use
for warmwater fish and other aquatic life, but also
designated as principal migratory routes for
anadromous salmonids, except for inland lakes as
prescribed in R 323.1065, the DO shall not be lowered
below 5 mg/1 as a minimum during periods of migration.
R 323.1065. Dissolved oxygen; inland lakes. Rule 65.
(1) The following standards for dissolved oxygen shall
apply to lakes designated as trout lakes by the
natural resources commission or lakes listed in the
publication entitled "Coldwater Lakes of Michigan":
-20-
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State
Designated Use and Criteria Value
Minnesota'
23
(a),. In stratified coldwater lakes which have DO
concentrations leSs than 7 mg/1 in the upper half of
the hypolimnion, a minimum of 7 mg/1 DO shall be
maintained throughout the epilimnion and upper 1/3 of
the thermocline during stratification.*
(b) Except for lakes described in subdivision (c)
of this subrule, in stratified coldwater lakes which
have DO concentrations greater than 7 mg/1 in the
upper half of the hypolimnion, a minimum of 7 mg/1 of
DO shall be maintained in the epilimnion, thermocline,
and upper half of the hypolimnion.*
(c) In stratified coldwater lakes which have DO
concentrations greater than 7 mg/1 throughout the
hypolimnion, a minimum of 7 mg/1 shall be maintained
throughout the lake.
(d) In unstratified coldwater lakes, a minimum of
7 mg/1 of DO shall be maintained throughout the lake.
(2) For all other inland lakes- not specified in
subrule (1) of this rule, during stratification, a
minimum DO concentration of 5 mg/1 shall be maintained
throughout the epilimnion. At all other times, DO
concentrations greater than 5 mg/1 shall be maintained.
* Lakes capable of sustaining oxygen throughout the
hypolimnion shall maintain oxygen throughout the
hypolimnion. At all other times, DO concentrations
greater than 7 mg/1 shall be maintained.
Fisheries and Recreation.
Class 2A. Not less than 7 rag/J at all times
(instantaneous minimum concentration).
Class 2B. Not less than 5 mg/J at all times
(instantaneous minimum concentration).
Class 2C. Not less than 5 mg/J at all times
(instantaneous minimum concentration).
* This dissolved oxygen standard shall be construed to
require compliance with the standard 50 percent of the
days at which the flow of the receiving water is equal
to the lowest flow with a once in ten year recurrence
interval (7Q10).
Mississippi
24
All Classes. Dissolved oxygen concentrations shall be
maintained at a daily average of not less than 5.0
instantaneous minimum of not less than
mg/1 with an
-21-
-------
State
Designated Use and Criteria Value
4.0 mg/1 in streams; shall be maintained at a daily
average of not less than 5.0 mg/1 with an
instantaneous minimum of not less than 4.0 mg/1 in
estuaries and in the tidally affected portions of
streams; and shall be maintained at a daily average of
not less than 5.0 mg/1 with an instantaneous minimum
of not less than 4.0 mg/1 in the epilimnion (i.e. the
surface layer of lakes and impoundments that are
thermally stratified, or five feet from the water's
surface . (mid-depth if the lake or impoundment is less
than 10 feet deep at the point of sampling)) for lakes
and impoundments that are not stratified.
Epilimnion samples may be collected at the approximate
mid-point of that zone (i.e., the mid-point of the
distance or if the epilimnion is more than five feet
in depth, then at five feet from the water's surface).
Epheaeral Streams. The dissolved oxygen shall be
maintained at an appropriate level to avoid nuisance
conditions.
Missouri
25
Montana
26
Nebraska
27
Vater contaminants shall not cause the dissolved
oxygen to be lower than the levels described below:
Protection of Aquatic Life. 5 mg/1.
Coldvater Fishery. 6 mg/1.
A-l/B-1, C-l Classification. Not below 7.0 mg/1.
B-2, C-2 Classification. Not below 7.0 mg/1 from
10/1-6/1, nor below 6.0 mg/1 from 6/2-9/30.
B-3, C-3 Classification. Not below 5.0 mg/1.
E Classification. Not below 3.0 mg/1.
Coldvater Habitat:
Class A.
One day minimum, of not less than 8 mg/L for salmonid
early life stages. This criterion applies form
October 1 through May 31.
One day minimum of not less than 4.0 mg/L for all life
stages other than salmonid early life stages. This
criterion applies from June 1 through September 30.
Seven day mean minimum of not less than 5.0 mg/L.
This criterion applies from June 1 though September 30.
-22-
-------
State Designated Use and Criteria Value
Seven day mean of not less than 9.5 mg/L for salmonid
early life stages. This criterion applies from
October 1 through May 31.
Thirty day mean of not less than 6.5 mg/L. This
criterion applies from June 1 through September 30.
Class B.
One day minimum of not less than 5 mg/L for coldvater
fish early life stages. This criterion applies from
April 1 through June 30.
One day minimum of not less than 4-.fr mg/L for all life
stages other than coldwater fish early life stages.
This criterion applies from July 1 through March 31.
Seven day mean minimum of not less than 5.0 mg/L.
This criterion applies from July 1 though March 31.
Seven day mean of not less than 6.5 mg/L for coldvater
fish early life stages. This criterion applies from
April 1 through June 30.
Thirty day mean -of not less than 6.5 mg/L. This
criterion applies from July 1 through March 31
Un-ionized Ammonia (as N) is not to exceed 0.04 mg/L.
Varmvater Habitat:
Class A.
One day minimum of not less than 5.0 mg/L for early
life stages of identified key species. This criterion
applies from April 1 through September 30.
One day minimum of not less than 3.0 mg/L for all life
stages other than early life stages of identified key
species. This criterion applies from October 1
through March 31.
Seven day mean minimum of not less than 4.0 mg/L.
This criterion applies from October 1 through March 31.
Seven day mean of not less than 6.0 mg/L for early
life stages of identified key species. This criterion
applies from April 1 through September 30.
Thirty day mean of not less than 5.5 mg/L. This
criterion applies from October 1 through March 31.
Un-ionized Ammonia (as N) is not to exceed 0.06 mg/L.
-23-
-------
State
Nevada
28
Nev Hampshire
29
New Jersey
30
Designated Use and Criteria Value
Class B.
One day minimum of not less than 3.0 mg/L.
Seven day mean minimum of not less than 4.0 mg/L.
Thirty day mean of not less than 5.5 mg/L.
Un-ionized Ammonia (as N) is not to exceed 0.10 mg/L.
Class A. Must not be less than 6.0 mg/1.
Class B and C. For trout vaters, not less than 6.0
mg/1; for non-trout vaters, not less than 5.0 mg/1.
Class 0. Not less than 3.0 og/1.
For DO concentrations of specific regions, see
Class A. . Not less than 75* of saturation, nor less
than 6 ppm in cold water fisheries.
Class B. ^Not less than 75X of saturation, nor less
.than 6 ppn in cold water fisheries unless naturally
occurring..
Class C. Not less than 5
fisheries, nor less than 6 ppm
fisheries unless naturally occurring.
ppm. in warm water
less than 6 ppm in cold water
1. ppm » parts per million « mg/1.
(i) FW2-TP. Not less than 7.0 mg/1 at any time.
(ii) FV2-TM. 24 hour average not less than 6.0 mg/1.
Not less than 5.0 mg/1 at any time, (see paragraph
viii below)
(iii) Fff2-NT. 24 hour average not less than 5.0 mg/1,
but not less than 4.0 mg/1 at anytime, (see paragraph
viii below)
(iv) Tidal portions of FTO-NT tributaries to the
Delaware River, between Rancocas Greek and Big Timber
Creek inclusive. Not less than 4.0 mg/1 at any time.
(v) SC. Not less than 5.0 mg/1 at any time.
(vi) SE2. Not less than 4.0 mg/1 at any time.
(vii) SE3. Not less than 3.0 mg/1 at any time.
-24-
-------
State
Designated Use and Criteria Value
(viii) m-TM, FTC-NT, SB1. Supersaturated dissolved
oxygen values shall be expressed as their
corresponding 100 percent saturation values for
purposes of calculating 24 hour averages.
Nev Mexico
31
Coldwater Fishery 6.0 mg/L
Limited Warmwater Fishery 4.0 mg/L
Marginal Coldwater Fishery 5.0 mg/L
Varmwater Fishery 5.0 mg/L
Nev York
32
Classes AA, A, B, C:
Cold water trout spawning waters. Not less than 7.0
mg/1 from other than natural conditions.
Trout waters. Minimum daily average shall not be less
than 6.0 mg/1. At no time shall DO concentration be
less than 5.0 mg/1.
Nontrout waters. Minimum daily average not less than
5.0 ng/1. At no time shall DO concentration be less
than 4.0 mg/1.
Class D. Shall not be less than 3 mg/1 at any time.
Class SAf SB, SC. Shall not be less than 5 mg/1 at
any time.
Class SD. Shall not be less than 3 mg/1 at any time.
Class A Special.
than 6.0 mg/1.
(Great Lakes epilimnion) Not less
Class AA Special:
Class I. Shall not be less than 4 mg/1 at any
time. y
Class II. Average not less than 30 percent saturation
during any week of the year, provided such saturation
levels insure adequate oxygen to support fish and
shellfish life at all times.
North Carolina
33
Trout waters. Not less than 6 mg/1.
Non-trout waters. Not less than a daily average of 5
mg/1 with a minimum instantaneous value of not less
than 4 mg/1.
Swamp waters. May have lover values if caused by
natural conditions.
-25-
-------
State
North Dakota3
Designated Use and Criteria Value
All streams. Not less than 5.0 mg/1.
Ohio
35
Vanvater Aquatic Life Habitat. 4.0 mg/1 minimum at
any time, 5.0 mg/1 minimum 24-hour average.
Exceptional Vanvater, and Coldvater Aquatic Life
Habitat. 6.0 mg/1 minimum at any time.
Nuisance Prevention. 2.0 mg/1 minimum at any time,
3.0 mg/1 minimum 24-hour average.
Public and Agricultural Supply. This criterion is
determined by the Aquatic Life Habitat or the Nuisance
Prevention use designation assigned to the stream
segment.
Ohio River. 4.0 mg/L minimum at any time, 5.0 mg/L
minimum average. 5.0 mg/L minimum at any time during
April 15 - June 15.
Lake Erie. 6.0 mg/L minimum at any time.
0 Idaho**
36
Secondary ¥an Water Fishery.
(April 1 - June 15) Not less than 4.0 mg/1.
(June 16 - March 31) Not less than 3.0 mg/1.
Primary Van Water Fishery.
(April 1 - June 15) Not less than 6.0 mg/1..^
(June 16 - October 15) Not less than 5.0
(October 16 - March 31) Not less than 5.0 mg/1.
SaallBouth Bass/Trout.
(March 1 - May 30) Not less than 7.0 mg/l.j
(June 1 - October 15) Not less than 6.0 mg/1..^
(October 16 - February 28) Not less than" 6.0
mg/1.
1. Because of natural diurnal dissolved oxygen
fluctuation, a 1.0 mg/1 dissolved oxygen concentration
deficit shall be allowed for not more than eight (8)
hours during any tventy-four (24) hour period.
Oregon
37
Fresh vaters. DO concentrations not less than 90
percent of saturation at the seeisonal low, or less
than1 95 percent of saturation in spawning areas during
-26-
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State
Designated Use and Criteria Value
spawning, incubation, hatching and fry stages of
salmonid fishes.
Marine and Bstuarine waters. (Outside of zones of
upwelled marine waters naturally deficient in DO): DO
concentrations shall not be less than 6 mg/1 for
estuarine waters, or less than saturation
concentrations for marine waters.
Pennsylvania
38
Rhode Island
39
DOj. Minimum daily average 6.0 mg/1; no value less
than 5.0 mg/1. For lakes, ponds and impoundments
only, no value less than 5.0 mg/1 at any point.
-D02« Minimum daily average 5.0 mg/1; no value less
than 4.0 mg/1. For the epilimnion of lakes, ponds and
impoundments, minimum daily average of 5.0 mg/1, no
value less than 4.0 mg/1.
D0~. Minimum daily average not less than 5.0 mg/1;
during periods 4/1 - 6/15 and 9/16 - 12/31 not less
than 6.5 mg/1 as a seasonal average.
DO^. Minimum daily average not less than 3.5 mg/1;
during periods 4/1 - 6/15 and 9/16 - 12/31, not less
than 6.5 mg/1 as a seasonal average.
DOj. For the period 2/15 - 7/31 of any year, minimum
daily average of 6.0 mg/1, no value less than 5.0
mg/1. For the remainder of the year, minimum daily
average of 5.0 mg/1, no value less than 4.0 mg/1.
D06. No value less than 7.0 mg/1.
Class A. 75Z saturation, 16 hours/day, but not less
than 5 mg/1 at any time.
Class B. 75Z saturation, 16 hours/day, but not less
than 5 mg/1 at any time.
Class C. Minimum 5 mg/1 any time. Normal seasonal
and diurnal variations above 5 mg/1 will be maintained.
Class D. A minimum of 2 mg/1 at any time.
Class SA. Not less than 6.0 rag/1 at any time.
Class SB. Not less than 5.0 mg/1 at any time.
Class SC. Not less than 5 mg/1 during at least 16
hours of any 24-hour period not less than 4 mg/1 at
any time.
-27-
-------
State
Designated Use and Criteria Value
South Carolina
40
Class AA, SAA. Natural conditions, will be maintained
and protected as feasible, within the Department's
statutory authority.
Class A-Trout, B-Trout. Not less than 6 mg/1.
Class A, B, SA, SB. Daily average not less than 5
mg/1 with a low of 4 ng/1.
Class SC. Not less than 4 mg/1.
South Dakota
41
Coldwater permanent fish life propagation waters.
Shall be greater than 6.0 mg/1 with a variation
allowed under subdivision 74:03:02:32(1).
In spawning areas during the spawning season shall be
greater than 7.0 mg/1 with a variation allowed under
subdivision 74:04:02:32(1).
Warmvater semipermanent fish life propagation waters.
Shall be greater than 5.0 mg/1 with a variation
allowed under subdivision 74:03:02:32(1).
Warmvater marginal fish life propagation waters.
Shall be greater than 4.0 mg/1 with a variation
allowed under subdivision 74:03:02:32(1).
Immersion recreation waters, and limited contact
recreation waters. Shall be greater than 5.0 mg/1
vith a variation allowed under subdivision
74:03:02:32(1).
Tennessee'
42
Domestic Vater Supply, Industrial Water Supply,
Recreation, Irrigation, and Livestock Watering and
Wildlife. There shall always be sufficient dissolved
oxygen present to prevent odors of decomposition and
other offensive conditions.
Pish and Aquatic Life. The dissolved oxygen shall be
a minimum of 5.0 mg/1 except in limited sections of
streams where it can be clearly demonstrated that (i)
the existing quality of the water due to irretrievable
man-induced conditions cannot be restored to the
desired minimum of 5.0 mg/1 dissolved oxygen; (ii) the
cost for application of effluent limitations more
stringent than those defined through Section 301(b) of
the Federal Water Pollution Control Act (PL 92-500) is
economically prohibitive when compared with the
benefits to be obtained; or (iii) the natural
qualities of the vater are less than the desired
minimum of 5.0 mg/1. Such exceptions shall be
-28-
-------
State Designated Use and Criteria Value
determined on an individual basis but in no instance
shall the dissolved oxygen concentration be less than
3.0 mg/1. The dissolved oxygen concentration shall be
measured at mid-depth in waters having a total depth
of ten (10) feet or less and at a depth of five (5)
;J6t ,in> V3terS £aVi1?? a t0tal depth of Beater than
ten (10) feet. The dissolved oxygen concentration of
recognized trout screams shall not be less than 6.0
mg/1. The above criteria are applicable to
tailwaters.
43
Tcxas A11 values are presented as Mean/Minimum in mg/1
Exceptional Aquatic Life
Freshwater - 6.0/4.0
Freshwater in Spring - 6.0/5.0
High Aquatic Life
Freshwater - 5.0/3.0
Freshwater in Spring - 5.5/4.5.
Intermediate Aquatic Life
Freshwater - 4.0/3.0
Freshwater in Spring - 5.0/4.0
Limited Aquatic Life
Freshwater - 3.0/2.0
. Freshwater in Spring - 4.0/3.0
Dissolved oxygen for unclassified waters.
Unclassified waters which are perennial or support
perennial aquatic life uses are designated for the
specific uses that are existing or characteristic of
those waters. In instances where the executive
director of the commission determines that little or
no information is available to assess those uses, the
waters will be preliminarily assumed to have a limited
anUa«™7 i , US!, "^ associat*<* criteria, as defined
in §307.7 of this title (relating to Site-specific
Uses and Criteria). Upon administrative or regulatory
action by the commission which affects a particular
unclassified water body, the characteristics of the
affected water body will be reviewed to determine
which aquatic life uses are appropriate. Additional
uses so determined shall be indicated in public
notices for discharge applications. Uses which are
not applicable throughout the year in a particular
unclassified water body will be assigned and protected
tor the seasons in which such uses occur. Initial
determinations of use shall be considered preliminary.
and in no way preclude redetermihations of use in
public hearings conducted by the commission under the
provisions of the Texas Water Code.
-29-
-------
Stat*
Designated Use and Criteria Value
Utah
44
Domestic Source Class 1C, Recreation and Aesthetics
Classes 2A, 2B. Not less than 5.5 mg/1.
Aquatic Wildlife Class 3A^ Not less than 6.5 mg/1 for
30 day average, 9.5/5.0 mg/1 for 7 day average, or
8.0/4.0 for 1 day average.
Aquatic Wildlife Class 3B^ Not less than 5.5 mg/1 for
30 day average, 6.0/4.0 mg/1 for 7 day average, or
5.0/3.0 for 1 day average.
Aquatic Wildlife Class 3C fc 3D. Not less than 5.0
mg/1 for 30 day average or 3.0 for 1 day average.
*lst number for when early life stages are present.
2nd number for all other life stages.
45
Vermont
Cold Water Fish
Habitat
Warm Water Fish
Habitat
Not less than 7 mg/1 or 75 percent saturation at all
times, nor less than 95 percent saturation during late
egg maturation and larval development of salmonids in
areas which the Secretary determines are salmonid
spawning or nursery areas important to the
establishment or .maintenance of the fishery resource.
Not less than 6 mg/1 or 70 percent saturation at all
times in all other waters designated as a cold water
fish habitat.
Not less than 5 mg/1 or 60 percent saturation at all
times.
Virgin!)
46
Class I—Open Ocean. Minimum of 5.0 mg/1.
Class II—Estuarine Waters.
Daily average of 5.0 mg/1.
Minimum of 4.0 mg/1.
Class III—Non-tidal Waters. Same as Class II.
Class IV—Mountainous Zone Waters. Same as Class II.
Class V—Put and Take Trout Waters. Minimum of 5.0
mg/1. Daily average of 6.0 mg/1.
Class VI—Natural Trout Waters. Minimum of 6.0 mg/1.
Daily average of 7.0 mg/1.
Class VTI—Swamp Water. The natural quality of swamp
water may fall outside of the ranges for DO set forth
above; therefore, on a case-by-case basis, standards
-30-
-------
State
Designated Use and Criteria Value
for specific swamp vaters can
reflect what natiiral quality is.
be developed that
Washington
47
Class AA (Extraordinary). Freshwater shall exceed 9.5
rag/1. Marine water shall exceed 7.0 mg/1 when natural
conditions, such as upwelling occur, causing the
dissolved oxygen to be depressed near or below 7.0
mg/1, natural dissolved oxygen levels can be degraded
by up to 0.2 mg/1 by man-caused activities.
Class A (Excellent). Freshwater shall exceed 8.0
mg/1. Marine water shall exceed 6.0 mg/1, except when
the natural phenomenon of upwelling occurs, natural
dissolved oxygen levels can be degraded by up to 0.2
mg/1 by man-caused activities.
Class B (Good). Freshwater shall exceed 6.5 mg/1.
Marine water shall exceed 5.0 mg/1. When natural
conditions such as upwelling occur, causing the
dissolved oxygen to be depressed near or below 5.0
mg/1, natural dissolved oxygen levels can be degraded
by up to 0.2 mg/1 by man-caused activities.
Class C (Fair). Shall exceed 4.0 mg/1. When natural
conditions such as upwelling occur, causing the
dissolved oxygen to be depressed near or below 4.0
mg/1, natural dissolved oxygen levels can be degraded
by up to 0.2 mg/1 by man-caused activities.
Lake Class.
conditions.
No measurable decrease from natural
Vest Virginia
48
Kanavha River Basin.
time.
Not less than 4.0 mg/1 at any
Ohio River Basin. Concentration shall average 5.0
mg/1 per calendar day and shall not be less than 4.0
mg/1 at any time or place outside the mixing zone.
Trout Vaters. Not less than 7.0 mg/1 in spawning
areas, 'and in no case less than 6.0 mg/1 at any time.
Categories A, B, and C. Not less than 5.0 mg/1 at any
time.
Wisconsin
49
Fish and Aquatic Life. Except for vaters classified
as trout streams in Wisconsin Trout Streams.
Publication 213-72, the dissolved oxygen content in
surface vaters shall not be lovered to less than 5
mg/1 at any time.
-31-
-------
State Designated Use and Criteria Value
Dissolved oxygen in classified trout streams shall not
be artificially lowered to less than 6.0 mg/1 at any
time, nor shall the dissolved oxygen be lowered to
less than 7.0 mg/1 during the spawning season.
The dissolved oxygen in great lakes tributaries used
by stocked salmonids for spawning runs shall not be
lowered below natural background during the period of
habitation.
Intermediate Aquatic Life. DO shall not be less than
3 mg/1.
Marginal Surface Waters. DO shall not be less than 1
mg/1.
Wy°"lns In a11 Class I and II waters, wastes attributable to
or influenced by the activities of man shall not be
present in amounts which will result in death or
injury to existing aquatic life or which will result
in a dissolved oxygen content of less than 6 mg/1 at
any time.
In all Class III waters, wastes attributable to or
influenced by the activities of man shall not be
present in amounts which, will result in injury or
death to existing aquatic-life or which will result in
a dissolved oxygen content of less than 5 mg/1 at any
time.
Over spawning areas, wastes attributable to or
influenced by the activities of man shall not be
present in amounts which will cause reduction in the
natural dissolved oxygen content, unless such
reduction is the result of a thermal discharge allowed
under the provisions contained in Section 25 of these
regulations.
American Samo*51 All Fresh Surface Waters. Not less than 15%
saturation or less than 6.0 mg/1. If the natural
level of DO is less than 6.0 mg/1, the natural level
shall become the standard.
Open Coastal Nearshore Waters, Oceanic Waters. Not
less than BOX of saturation or less than 5.5 mg/1. If
the natural level of DO is less than 5.5 mg/1, the
natural level shall become the standard.
For DO standards of specific embayments, see p. 21-23
of Vater Quality Standards for American Samoa.
-32-
-------
State
District of Columbia
52
Guam
53
Designated Use and Criteria Value
Class C. Minimum daily average of 5.0 mg/1 (3 samples
per 24 hours once per 8 hours), vith an instantaneous
minimum of 4.0 mg/1.
All vaters. Shall not be decreased belov 75 percent
saturation at any time, as influenced by salinity of
naturally occurring temperature variations. Where
natural conditions cause lower DO levels, controllable
water quality factors shall not cause further
reductions.
Northern Mariana
Islands
Puerto Rico
55
Trust Territory
.56
Except from natural causes, the following standards
apply:
Class AAfl — Not less than 6.0 mg/1.
Class A — Not less than 5.0 mg/1.
Class SA.
causes.
Shall not be altered except by natural
Class SB. Shall contain not less than "5 mg/1, except
when natural phenomena cause this value to be
depressed.
Class SC. Shall contain not less than 4 mg/1, except
when natural phenomena cause this value to be
depressed.
Class SD. Shall contain not less than 5.0 mg/1 except
during not more than 4 hours within any 24 hour period
when it can contain no less than 4.0 mg/1, except when
natural conditions cause this value to be depressed.
All waters. Shall not vary by more than 25% from
natural conditions.
Except for natural causes, DO concentration for the
following classes shall not be less than:
Class AA, 1 — 6.0 mg/1 or 15% of saturation,
whichever is greater.
Class A, 2 — 5.0 mg/1.
Class B — 4.5 mg/1.
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State Designated Use and Criteria Value • •
Virgin IslandsS? Class A. .Existing natural conditions shall not be
changed.
Class B. Not less than 5.5 mg/1 from other than
natural conditions.
Class C. Not less than 5.0 mg/1 from other than
natural conditions. •
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