United States
Environmental Protection
Age t icv
Qffict* of Water
Planning and Standard
Washington DC 20460
December 1979
810R79104
Water
Dissolved Oxygen
Water Quality Standards
Criteria Digest
A Compilation
of State/Federal Criteria

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ENVIRONMENTAL PROTECTION AGENCY
WATER QUALITY STANDARDS
CRITERIA DIGEST - CORRECTIONS
In December 1979, EPA published four documents containing the
summaries of State Water Quality Standards. In those four documents
a number of errors appeared which need correction. These corrections
are listed below.
ACIDITY-ALKALINITY (pH)
1.	Idaho. Page 7: add as the first phrase the following general
statement - Values for all waters are to be within the range of
6.5 - 9.0.
2.	Mississippi. Page 11: delete the criteria and uses for
agriculture, industrial, and navigation.
BACTERIA
1.	Alabama. Page 1: for F & WL, change the geometric mean of
100/100 to 1,000/100.
2.	Florida. Page 9: for PWS change 1,000/100 fecal col 1forms to
1,000/100 total fecal col 1 forms.
3.	Nevada. Page 19: (a) second paragraph, change intrastate to
interstate, (b) under the more stringent criteria, change
interstate to intrastate and add Class B with Class A.
4.	Tennessee. Page 29: for PWS, change total to fecal, and for F &
WL replace "no criteria" with "same as Class 1."
5.	Utah. Page 31: Continues as:
Utah (cont'd) Class C (PWS after treatment; recreation, excepting swimming
unless natural purification action results in quality
consistent with class "CR" standard and swimming is
specifically approved by State board of health): Monthly
arithmetic mean total coliforms not to exceed 5,000/100,
except 20% of samples may exceed this if no more than 5%
exceed 20,000/100, and monthly arithmetic mean coliforms
shall not exceed 2,000/100.
Class CR (swimming): Monthly arithmetic mean col iforms not
exceed 1,000/100; no more than 20% exceed this and no more
than 5% exceed 4,000/100; and monthly arithmetic mean fecal
coliforms exceed 200/100, provided no more than 10% exceed
400/100.

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Class D (limited irrigation, not including lawns, rec.
areas, dairy pastures, root crops or low growing crops for
human consumption): Monthly arithmetic mean coliforms not
exceed 5,000/100, except 20% of samples may exceed this if
no more than 5% exceed 20,000/100.
Vermont	Class A (PWS with disinfection): Total coliforms not exceed
100/100. Fecal coliform: none attributable to discharge of
domestic or industrial wastes.
Class B (PWS with treatment; bathing): Total coliforms not
exceed 500/100. Fecal coliform not exceed 200/100.
Class C (secondary contact recreation): Fecal coliforms not
to exceed 1,000/100.
Virginia	In all surface waters, except those areas where public or
leased private shellfish beds are present, the fecal
coliform bacteria shall not exceed a log mean of 200/100 ml
with not more than 10% of total samples during any 30-dcty
period exceeding 400/100 ml. Evaluation should be
determined by either multi-tube fermentation for marine
waters or membrane filtration method for freshwaters and
should be based upon not less than 10% of samples taken over
not more than a 30-day period.
Shellfish - In all open ocean or estuarine waters capable of
propagating shellfish or in specific areas where public or
leased private shellfish beds are present, and including
those waters on which condemnation or restricted
classifications are established by State Department of
Health, the following standard will aply: the median fecal
coliform value for a sampling station shall not exceed an
MPN of 14/100 of samples and not more than 10% of the
samples shall exceed 43 for a 5-tube, 3-dilution test or 49
for a 3-tube, 3-dilution test.
DISSOLVED OXYGEN
1. Idaho. Page 8: substitute the given criteria with the
following:
Cold Water Fishery - exceed 6 mg/1 at all times, minimum daily
average will be 7 mg/1.
Warm Water Fishery - exceed 5 mg/1 at all times, minimum daily
average will be 6 mg/1.
Miscellaneous - Salmonid Spawning; exceed 90% of saturation or 6
mg/1, whichever is greater.

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2.	Mississippi. Page 13: Substitute the given criteria with the
following:
Dissolved oxygen concentrations shall be maintained at a daily
average of not less than 5. mg/1 with an instantaneous nimimum of
not less than 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 impounments that are thermally stratified, or 5 feet frcm
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 5 feet in depth, then at 5 feet from the water's
surface.
(Applicable to all classes).
%
3.	Oregon. Page 17: Replace the Cold Water Fishery criteria of 75%
with 90% and delete the phrase "or 5-7 mg/l.M
HISSOLVED SOLIDS
1.	Arizona. Page 1: Delete the phrase for no requirements. Also,
in the last sentence of paragraph change "goals" to "standards."
2.	Kentucky. Page 10: Delete the use and criteria for industrial
water supply.
3.	North Carolina. Page 16: Replace the phrase for no requirements
with Class A-II: total dissolved solids - 500 mg/1; sulfates -
250 mg/1.

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United Slates
Environmental Protection
Agency
Office of Water
Planning and Standard
Washington DC 20460
December 1979
Water
Dissolved Oxygen
Water Quality Standards
Criteria Digest
A Compilation
of State/Federal Criteria

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INTRODUCTION
This digest was compiled to provide general information to the public
as well as to Federal, State, and local officials. It contains
excerpts from the individual State-Federal water quality standards
establishing pollutant specific criteria for navigable 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 navigable waters, evaluating adherence to the
standards, and overseeing enforcement of standards compliance, has
been mandated by Congress.
The standards program, a nationwide strategy for surface water
quality management, contains two major elements: the use (recreation,
drinking water, fish and wildlife propagation, industrial, or
agricultural) to be made of the navigable water; and criteria to
protect these uses.
Water quality criteria (numerical or narrative specifications) for
physical, chemical, temperature, and biological constituents are
stated in the July 1976 U.S. Environmental Protection Agency publi-
cation _QuaJJJt^_Crrtj?r^	(QCW), order # 055-001-01049-4,
price $3.50, available from the Government Printing Office,
Washington, D.C. The 1976 QCW, commonly referred to as the "Red
Book," is the most current compilation of scientific information used
by the Agency as a basis for assessing water quality. This
publication is subject to periodic updating and revisions in light of
new scientific and technical information.
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 1 ife-developtnent 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 1976 Quality Criteria for Water recommends that
water should contain sufficient dissolved oxygen to maintain
aerobic conditions in the water column and, except as affected by
natural phenomena, at the sediment-water interface. A minimum
concentration of dissolved oxygen to maintain good fish populations
is 5.0 mg/1. The criterion for salmonid spawning beds is a minimum
of 5.0 mg/1 in the waters present around stream basin gravel.
I

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Since water quality standards are revised from time to time,
following procedures set forth in the Clean Water 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 water pollution control agencies or the EPA
Regional Offices.
II

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Individual State-adopted criteria follow:
KEY
PWS
Pub! ic Water Suppl y
Rec.
Recreation
F&WL
Fish and Wildlife
Ind.
Industrial
Agric.
Agricul tural
Mg/1
Milligrams per Liter
SAR
Sodium Absorption Ratio
(For explanation of use classifications, see EPA publication,
General Stream Use Designations.)

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DISSOLVED OXYGEN CRITERIA (Minimum Level)
Cold Water
State
AT abama
AT aska
Fresh: 7 mg/1
>5 mg/1 in spawn-
ing gravel
Warm Water
Fishery
5 mg/1*
Miscellaneous
Shel 1 fish-5 mg/1 *
>5 mg/1 for waters
not used by ana-
dromous or resi-
dent fish. Total
dissolved gas not
to exceed 110% of
saturation.
American Samoa
Arizona
Arkansas
Cal iform'a
The concentration of dissolved oxygen shall not be 1 ess
than 10% below the level which would occur naturally or
5.0 milligrams per litter, whichever is greater. If
concentrations of dissolved oxygen which would occur
naturally are less than 5.0 milligrams per liter, the
dissolved oxygen shall not deviate due to the activities
of man from the concentrations which would occur
naturally.
6 mg/1
6 mg/1
Dissolved Oxygen - The dissolved oxygen in the waters
shall not be less than 5 milligrams per liter (mg/1), and
in streams this shall be the critical deficit point of
the dissolved oxygen profile. The only exceptions will
be when periodic lower values are of natural origin and
therefore beyond control of the water user. For trout
and small mouth bass waters the minimum dissolved oxygen
content shall not be less than 6 mg/1. The dissolved
oxygen sample in streams shall be taken at mid-depth or 5
feet, whichever is less, and at mid-stream in smaller
streams. On the larger ri vers the dissolved oxygen shall
be determined by the average of concentrations in samples
collected at quarter points across the river.
(la) Klamath River Basin
Dissolved oxygen concentrations shall not be reduced
below the following minimum levels at any time:
Waters designated WARM, MAR, or SAL 	 5.0 mg/1
Waters designated COLD 				 6.0 mg/1
Waters designated SPUN			 7.0 mg/1
Waters designated SPWN during critical
spawning and egg incubation periods		 9.0 mg/1
(lb) North Coastal Basin (Same as (la)).
Except under extreme conditions may range between 5 mg/1 and 4 mg/1 if
due to natural causes.
1

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(2) San Francisco Bay Basin
For all tidal waters, the following objectives shall apply:
In the Bay downstream of Carquinez Bridge	5.0 mg/1 minimum
Upstream from Carquinez Bridge	7.0 mg/1 minimum
For nontidal waters, the following objectives shall apply:
Waters designated as cold water habitat	7.0 mg/1 minimum
Waters designated as warm water habitat	5.0 mg/1 minimum
(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:
Minimum DO, mg/1
Water designated AGR, excluding GWR	2.0
WARM	5.0
SPWN, MAR, or COLD	7.0
(4a) Santa Clara River Basin
The mean annual dissolved oxygen concentration shall be greater than 7
parts per million (ppm), provided that no single determination shall be
less than 5.0 ppm, except when natural conditions cause lesser
concentrations. Additionally, for cold surface streams and cold water
spawning streams the dissolved oxygen content shall not fall below 6.0
and 7.0 mg/1, respectively, as the result of waste discharges.
(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 concentra-
tions, then controllable water quality factors shall not cause further
reduction.
Additionally, for cold surface streams and cold water spawning streams
the dissolved oxygen content shall not fall below 6.0 and 7.0 mg/1,
respecti vely.
(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.
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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 % percentile concentration shall not fall below 75
percent of saturation. The dissolved oxygen concentrations shall
be reduced below the following minimum levels at any time:
not
Waters designated WARM
Waters designated COLD
Waters designated SPWN
5.0 mg/1
7.0 mg/1
7.0 mg/1
The following objectives apply to the water bodies specified. To the
extent of any conflict with the above, the more stringent objective
applies. The dissolved oxygen concentrations:
(1) Shall be maintained at or near established
seasonal levels from Keswick Dam to Fye
Street Bridge
(?) 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
saturat i on.
(3)	Shall be greater than or equal to 7.0 mg/1
from Hamilton City to Eye Street Bridge
from I June to 31 August.
(4)	Shall be greater than or equal to
all year.
(5)	Shall be greater than or equal to
from Oroville Fish Barrier Dam to
Creek from 1 September to 31 May.
(6)	Shall be greater than or equal to
from Cressey to New Exchequer Dam
times.
(7)	Shall be greater than or equal to
from Waterford to La Grange from
October to 15 June.
Applicable Water Body
Sacramento River, Shasta
Dam to Eye Street Bridge
Sacramento River, Shasta
Dam to Colusa Basin
Drain
Sacramento River, Shasta
Dam to Eye Street Bridge
7.0 mg/1 Lake Natoma
8.0 mg/1
Honcut
8.0 mg/1
at al 1
8.0
15
mg/1
Feather River, Fish
Barrier Dam to Sacramen-
to River
Merced River, Source to
McClure Lake
Tuolumne Ri ver, Don
Pedro Dam to San Joaquin
Ri ver
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
fol 1 owing level s:
-	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.
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(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:
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 mg/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.
(7B) East 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
Waters designated COLD or SPWN
5.0 mg/1
7.0 mg/1
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Colorado River (entire reach)
Other waters designated WARM
Other waters designated COLD
6.0 mg/1
5.0 mg/1
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 Ray (channels west of
Newport Boulevard and channel west of Lido Peninsula), tidal
prism of Santa Ana Rver, and Newport Shores Marina:
The dissolved oxygen concentration shall be greater than 4
mg/1 provided that not more than 20% of the samples collected
at any statioh'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
reservoi rs):
The median dissolved oxygen concentration shall not fall
below 85% of saturation in main water mass and the 95
percentile concentration shall not fall below 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 Hiego Rasin
Dissolved oxygen levels shall not be less than 5.0 mg/1 in inland
surface waters with designated MAR or WARM beneficial uses or less
than 6.0 mg/1 in waters with designated COLD beneficial uses. The
annual mean dissolved oxygen concentration shall not be less than 7
mg/1 more than 10% of the time.
5

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State
Col d Water
Fishery
Warm Water
Fi shery
Mi seel 1aneous
California(Cont.) Estuarine waters - a min. of 5 mg/1 for most waters, min.
of 6 and 7 mg/1 for other waters.
Coastal waters - a min. of 5 mg/1 with additional limits
on the annual mean ave. which ranges from 6 to 7 mg/1.
Colorado
Connecticut
6 mg/1
5 mg/1
PWS - 4 mg/1
Industrial - 3 mg/1
nelaware
**Class A and AA - 75% of saturation, 16 hours a day;
5 mg/1 at any time.
Class B - Same as Class A.
Class C - Not less than 5 mg/1 for more than 6 hours
during any 24-hour period, at no time less
than 4 mg/1. For cold water fishery, not
less than 5 mg/1 at any time.
SA	Not less than 6.0 mg/1
SB	Not less than 5.0 mg/1
SC	Same as C
9A. General criteria for all non-tidal portions of
stream basins (segments). Daily average con-
centrations shall not be less than 5.0 mg/1
nor less than 4.0 mg/1 at any time except when
natural phenomena cause this value to be depressed
further. Specific criteria for all tidal portions
of basins except Delaware River and Chesapeake and
Del aware Canal, but including Atlantic Ocean and
Delaware Bay below RM 48.2 in addition to general
criteria in 9A. Any repeated indicator/criterion
found here supersedes that of 9A. The dissolved
oxygen levels shall not be less than a daily
average of 6 mg/1 nor go bel ow 5 mg/1 at any
time. Specific criteria for Delaware River (from
PA-DE line, RM 78.8 to Liston Point RM 48.2) in
addition to the general criteria of 9A. Repeated
indicator/criteria here supersede that of 9A.
During April 1-June 15 and Sept. 16-Dec. 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
Mile 78.8, 4.5 mg/1 at Mile 70.0 and 6.0 mg/1 at
Mile 59.5.
**For explanation of use classifications, see-EPA publication, "General
Stream Use Designations."
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State
District of
Columbia
F1 orida
Georgia
Guam
Hawai i
Col d Water
F i shery
Warm Water
Mi seel 1 aneous
4.0 mg/1 min.
5.0 mg/1 daily
ave.
PWS - 5 mg/1
Shellfish - 24 hr. aver. 5 mg/1; min. 4 mg/1.
Recreation -
fresh: 5 mg/1
marine: 24 hr. aver. 5 mg/1; min. 4 mg/1.
Agriculture - 24 hr. aver. 4 mg/1; min, 3 mg/1.
Navigation - 2.0 mg/1
5 mg/1
Avg. 6
(Daily
mg/1)
4 mg/1 (Daily
Avg. 5 mg/1)
Industry, Agri-
culture, Naviga-
tion, Urban
streams - 3.0 mg/1
Concentrations of dissolved oxygen shall not be decreased
from natural conditions at any time.
decreased
natural
Concentrations of dissolved oxygen shall not be
below 75 percent saturation at any time. Where
conditions cause lower dissolved oxygen levels,
controllable water quality factors shall not cause
further reductions.
Coastal Waters -
**Class AA - 6 mg/1
Class A - 5 mg/1
CI ass B - 4.5 mg/1
limited to docking
areas. Fresh waters
used for fish prop-
agation - 5 mg/1.
**For explanation of use classifications, see EPA publication, "General
Stream Use Designations."
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State
Cold Water	Warm Water
Fishery	Fishery	Mi seel 1aneous
Idaho	75% saturation at
seasonal low; 100%
of saturation in
spawning areas
during spawning,
hatching & fry states
of salmonid fishes.
Illinois	General Standards. Dissolved oxygen (STORET Number -
00300) shall not be less than 6.0 mg/1 during at least
16 hours of any 24 hour period, not less than 5.0 mg/1
at any time.
Lake Michigan. Dissolved oxygen (STORET Number - 00300)
except due to natural causes shall not be less than 90%
of saturation.
Secondary Contact & Indigenous Aquatic Life. Dissolved
oxygen (STORET Number - 00300) shall not be less than
3.0 mg/1 during at least 16 hours in any 24-hour period,
nor less than 2.0 mg/1 at any time, and after December
1 3, 1 977 , shall not be less than 4.0 mg/1 at any time.
Indiana	SPC 1R-4 General Standards.
Warmwater Fish - Concentrations of dissolved oxygen shall
average at least 5.0 mg/1 per calendar day and shall not
be less than 4.0 mg/1 at any time (not approved by
USEPA).
Coldwater Fish - (aa) In those waters designated by the
Indiana Department of Natural Resources for put-and-take
trout fishing, dissolved oxygen concentrations shall not
be less than 6.0 mg/1 at any time or place.
(bb)Spawning areas (during the spawning
season) shall be protected by a minimum dissolved oxygen
concentration of 7.0 mg/1.
SPC 4R-2 Lake Michigan and Contiguous Harbor Areas.
Parameter	Inner Harbor, Lake Michigan
Gary Harbor and
Burns Harbor
Dissolved Oxygen
(mg/1)	7.0	7.0
SPC 7R-3 Grand Calumet River & Indiana Harbor Ship Canal.
(Dissolved Oxygen) Concentrations of dissolved oxygen
shall not be less than 4.0 mg/1 at any time.
SPC 10 R-2 Wolf Lake.
(Dissolved Oxygen) Concentrations of dissolved oxygen
shall average at least 5.0 milligrams per liter per cal-
endar day and shall not be less than 4.0 milligrams per
liter at any time, except at lower values associated with
depth may be tolerated or caused by natural conditions.
8

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State
In(1iana(Cont'd) Rearing or Imprinting Areas
1.	Trail Creek and tributaries upstream of U.S. Highway
35.
2.	Little Calumet River and tributaries upstream
(easterly) of the Wagner Road Rridge. The Wagner Road
Bridge is located downstream of Chesterton at the
southeast corner of the southwest quarter, Section 26, T
37 N, R 6 W, Porter County, Indiana.
3.	Kintzele Ditch (Rlack Ditch) from Beverly Drive
downstream to Lake Michigan.
4.	Salt Creek above its confluence with the Little
Calumet Ri ver.
Dissolved Oxygen: Concentrations shall not be less than
6.0 mg/1 at any time or place. During the spawning
season or during periods of rearing or imprinting, the
dissolved oxygen shall not fall below 7.0 mg/1 at any
time or any place.
Migration Routes
The criteria listed below are for evaluation of the
following streams used by salmonid fishes to migrate to
and from natural spawning or rearing or imprinting areas.
In those waters within migration routes where
put-and-take trout fishing exists, the requirements of
SPC 1R-4 shall apply.
Existing Migration Routes
Trail Creek from Highway 35 downstream to Lake Michigan.
Little Calumet River from Wagner Road Bridge downstream
to Lake Michigan via Burns Ditch.
Dissolved Oxygen: Concentrations shall average at least
6.0 mg/1 during any 24-hour period and shall not be less
than 5.0 mg/1 at any time. During periods of migration,
the dissolved oxygen shall not fall below 6.0 mg/1 at any
time or any place.
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State
Col d Water
Fishery
Warm Water
Fishery	Mi seel 1 aneous
Iowa
Kansas
Kentucky
Louisiana
7 mg/1-16 hrs.
5 mg/l-any time.
6.0 mg/1 mi n.
7.0 mg/1 min.
during spawning.
5 mg/1-16 hrs.
4	mg/l-any time.
5	mg/1
5 mg/1 -daily ave,
4 mg/l-min.
The following dissolved oxygen values represent minimum
values for the type of water specified. These values
shall apply at all times except in naturally dystrophic
waters or where natural conditions cause the dissolved
oxygen to be depressed. For short periods of time,
diurnal variations below the standard specified may
occur. However, no waste discharge or activity of man
shall lower the dissolved oxygen concentration to the
point where the diurnal variation falls below the
specified minimum.
FRESH WATER-
For a diversified warm water biota including game fish,
the daily D.D. concentrations shall be above 5 mg/1
assuming normal seasonal and dai iy variations are above
this concentration. However, they may range between 5
and 4 mg/1 for short periods of time during a 24-hour
period, provided the water quality is favorable in all
other respects.
FSTUARINF WATER-
Dissolved oxygen concentrations in estuaries and tidal
tributaries shall not be less than 4 mg/1 at any time or
place except in naturally dystrophic waters, or where
natural conditions cause D.O. to be depressed.
COASTAL WATER-
Dissolved Oxygen concentration in surface coastal waters
shall be greater than 5 mg/1 except when the upwellings
and other natural phenomena may cause this value to be
depressed.
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Cold Water	Warm Water
State	F i shery	F i shery	Mi seel 1aneous
Maine	**Class A - Not less than 75% saturation.
Class R] - Not less than 75% saturation, and not less
than 5 ppm at any time.
Class B2 - Mot less than 60% saturation, and not less
than 5 ppm at any time.
Class C - Not less than 5 ppm at any time.
Class D - Not less than 2 ppm.
Tidal or Marine Waters:
SA - Not 1 ess than 6 ppm.
SBj - Not less than 6 ppm.
SB2 - Not less than 6 ppm.
SC - Mot less than 5 ppm.
SO - Mot less than 3 ppm.
Maryland	4.0 mg/1 min.	5.0 mg/1 min.
5.0 mg/1 daily .ave.	6.0 mg/1 daily
(all except natural	ave. (NTW).
trout waters - NTW)
Massachusetts	6 mg/1	5 mg/1	Coastal-not less
than 6.0 mg/1.
Michigan	R 323.1064. Dissolved oxygen; Gre.it Lakes, connecting
waterways and inland streams.
Rule 1064. A minimum of 6 mi" 1igrams per liter of
dissolved oxygen in all Great Lakes and connecting
waterways shall be maintained and, except for inland
lakes as prescribed in rule 1065, 3 minimum of 6
milligrams per liter of dissolved oxyg-=n shall be
maintained at all times in all inland streams designated
by these rules to be protected for coldwater fish. In
all other waters, except for inland akes as prescribed
by rule 1065, a minimum of 5 milligrams per liter of
dissolved oxygen shall be maintained as a daily average
and no single value shall be less than 4 milligrams, per
liter in waters naturally capable of supporting warmwater
fish.
R 323.1065. Dissolved oxygen; inland -akes.
Rule 1 065. (1 ) The ¦Following standards for
dissolved oxygen shall apply to inland lakes capable of
supporting coldwater fish:
** For explanation of use classifications, see F^A publication,
"General Stream Use Designations."
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Michigan (Cont'd)	(a) In warmwater inland lakes with little water
exchange which are capable of sustaining a cold stratum
of wel1-oxygenated water throughout the summer above a
hypolimnion with very little oxygen, a minimum of 6
milligrams per liter of dissolved oxygen shall be
maintained throughout the epilimnion and the upper
one-third of the thermocline during the entire summer
stagnation period. At all other times, the dissolved
oxygen concentration shall be maintained at natural
1 evel s.
(b)	In inland lakes capable of sustaining high
oxygen values throughout the hypolimnion during periods
of stagnation, dissolved oxygen concentrations greater
than 6 milligrams per liter shall be maintained
throughout the entire lake.
(c)	In inland lakes which serve as principal
anadromous fish migration routes, dissolved oxygen
concentrations greater than 5 milligrams per liter shall
be maintained throughout the epilimnion and the upper
one-third of the thermocline in stratified lakes
throughout periods of fish migration. In unstratified
lakes, dissolved oxygen concentrations greater than 5
milligrams per liter shall be maintained throughout the
entire lake during periods of fish migration.
(d)	In shallow, unstratified coldwater inland
lakes, dissolved oxygen concentrations greater than 6
milligrams per liter shall be maintained throughout the
entire lake.
(2) The following standards for dissolved oxygen
shall apply to inland lakes capable of supporting
warmwater fish.
(a)	In warmwater lakes with little water exchange,
dissolved oxygen concentrations greater than 5 milligrams
per liter shall be maintained throughout the epilimnion
and the upper one-third of the thermocline during the
entire summer stagnation period. At all other times,
dissolved oxygen concentrations shall be maintained at
natural levels.
(b)	In warmwater lakes with a high rate of water
exchange, dissolved oxygen concentrations greater than 5
milligrams per liter shall be maintained throughout the
epilimnion and the upper one-third of the thermocline
during the summer stagnation period. At all other times,
dissolved oxygen concentrations greater than 5 milligrams
per liter shall be maintained except in areas where
natural oxygen depressions occur.
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Cold Water	Warm Water
Fish'ery	Fishery	Mi seel 1 aneous
Fisheries arid Recreation
Class A
Dissolved Oxygen - Mot less than 7 mg/1 from
Oct, 1 and continuing through
May 31, and
not less than 6 mg/1 at other
t i mes.
Class B
Hi ssolved Oxygen - Not less than 6 mg/1 from April
1 through May 13, and
not less than 5 mg/1 at other
times.
Class C
Oissolved Oxygen - Not less than 5 mg/1 from April
1 through Nov. 30 and not less
than ^ mg/1 at other times.
Minimum dissolved oxygen concentration of 5.0 mg/1 at all
flows greater than the 7-day, once in ten year low flow
(7Q10) with an allowance of a minimum of 4.0 mg/1 at the
7Q10 flow.
6	mg/1	5 mg/1
7	mg/1 (0-1 )	5 mg/1 (D-3)
6 mg/1 (D-2)
4.0 to 7.0 mg/1
depending on use and
value of each classified
stream segment
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State
Nevada
Col d Mater
F i shery
5.0-8.0 mg/1,
varies with
stream and
season.
Warm Water
F i shery
Mi seel 1aneous
New Hampshire
6 mg/1
5 mg/1
Mew Jersey Class FW-l-Natural conditions
FW-2,FW-3,TW-1 Trout Production Trout Maintenance Non-trout
7.0 mg/1 min. 6.0 mg/1	24hr.ave. 5.0 mg/1	24 hr ave
5.0 mg/1	min. 4.0 mg/1	min.
TW-2	4.0 mg/1	min.
TW-3	3.0 mg/1	min.
CW-1 , CVi-2	5.0 mg/1	min.
Pel aware Ri ver
Zone 1 (Non-tidal) 5.0 mg/1	24 hr. ave.
4.0 mg/1	min.
Zone 2 (Tidal-PWS) 5.0 mg/1	24 hr. ave.
6.5 mg/1	seasonal ave. 4/1-6/15 and 9/6-12/31
3.5 mg/1	24 hr. ave.
6.5 mg/1	seasonal ave.4/1-6/15 and 9/16-12/31
Zone 5	6.5 mg/1	seasonal ave.4/1-6/15 and 9/16-12/31
3.5 mg/1	24 hr. ave. at R.M. 78.8
4.5 mg/1	24 hr. ave. at R.M. 70.0
6.0 mg/1	24 hr. ave. at R.M. 59.5
Zone 6	6.0 mg/1	24 hr. ave.
5.0 mg/1	min.
Central Pine Barrens
Class FW - Central Pine Barrens -	85% sat. min.
Class Lower Mullica and Wading Rivers - 85% sat. min.
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Cold Water	Warm Water
State	Fishery	Fishery	Mi seel 1aneous
Hew Mexico	4-6 mg/1 by segment
(see State std.)
Mew York Class N - Natural Conditions
AA,A,R,C	Trout Spawning Trout Maintenance Non-trout
7.0 mg/1 Min. 6.0	mg/1 MDA 5.0 mg/1	MDA
5.0	mg/1 min. 4.0 mg/1	min
D	3.0 mg/1	min
SA,SR,SC	5.0 mg/1	min.
SD	3.0 mg/1	min.
A Special (Great lakes-epilimnion) - 6.0 mg/1 Min.
AA Special - Natural Conditions
I (NY Harbor)	4.0 mg/1 Min
II (NY Harbor-Most now Class SP or I)	30%
North Carolina
6 mg/1 miri.
trout waters.
) mg/1 daily
ave.
4 mg/1 min.
4.0 mg/1, salt
swamp waters.
5.0 mg/1, tidal
salt waters.
Fresh swamp water
may be lower if
caused naturally.
North Hakota	Criteria based on Mot less than
"fish species	than 5.0 mg/1.
native to the
area"-5 mg/1, or
5 mg/1 -16 hrs.
per day and 3 mg/1
any time, by stream.
Ohio	Warmwater Habitat - Mot 1 ess than 5.0 mg/1 during at
least 16 hours of any 24-hour period. It may be less
than 5 mg/1 for a period not to exceed 8 hours within
?4-hour period, but at no time shall the oxygen content
he less than 4.0 mg/1. (Not approved by USEPA)
Exceptional Warmwater Habitat - 6 mg/1 as a minimum a
all times.
Coldwater Habitat - 6 mg/1 as a minimum at all times.
Seasonal Warmwater Habitat - 3.0 mg/1 as a minimum at
times. (Not approved by USEPA for designated waters)
Limited Warmwater Habitat - Same as warmwater habitat
except for specific lower limits assigned on a case by
case basis. (Not approved by USEPA for designated
waters)
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Ohio (Cont.)	Lake Frie outside excepted areas - 6 mg/1 as a minimum at
all times.
Lake Erie in excepted areas - Same as warmwater habitat.
Ohio Piver - Concentration shall average at least 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. (Not
approved by USEPA)
Mahoning River Basin for Aquatic Life (Warmwater
Fishery) - Not less than an average of 5.0 mg/1 per
calendar day and not less than 4.0 mg/1 at any time.
Lower Cuyahoga River - Dissolved Oxygen shall not be less
than a daily average of 5.0 mg/1 nor less than 4.0 mg/1
at any time. The dissolved oxygen standard need not be
met during the months of July, August, Sept., and Oct.
for that portion of the Cuyahoga River from the
confluence of the Cuyahoga River and Big Creek to the
mouth of the Cuyahoga River.
Oklahoma	The dissolved oxygen concentration shall not be less than
5.0 mg/1 for all warm waters and 6.0 mg/1 for those
waters designated as smallmouth bass or trout fisheries.
It is recognized that diurnal fluctuations of dissolved
oxygen occur in natural aquatic systems due to production
and respiration processes. Due to these natural
fluctuations, a 1.0 mg/1 dissolved oxygen concentration
deficit shall be allowed for not more than eight (8)
hours during any twenty-four (24) hour period.
The numerical and descriptive (i.e. bioassay related)
limits shall be maintained at all times and apply to all
perennial streams of the State with the exception of when
the flow is less than the seven-day, two-year low flow
value. For intermittent streams, the numerical and
descriptive limits shall be maintained except when the
flow is 1 ess than 1.0 cfs. All other general standards
shall be maintained at all times and apply to all
perennial and intermittent streams of the State except
when conditions are attributable to natural phenomena.
Furthermore, at times when the numerical and descriptive
limits do not apply, the instream dissolved oxygen
concentration shall be maintained to prevent nuisance
conditions caused by man's activities.
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State
Oregon
Col d Water
Fishery
75% saturation
at seasonal low
or 5-7 mg/1, by
stream; 95% sat.
in spawning areas
during spawning,
hatching and fry
devel opment.
Warm Water
Fishery
Miscel1aneous
Marine-not less
than saturation
Estuarine-6 mg/1
Pennsylvania	b] - Minimum daily average 6.0 mg/1; no value less than
5.0 mg/1.
b2 - Minimum daily average 5.0 mg/1; no value less than
4.0 mg/1.
b3 - 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.
b4 - 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.
b5 - For the period 2/15 to 7/31 of any year minimum
daily average of 6.0 mg;l, 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.
bfi - No value 1 ess than 7.0 mg/1.
b7 - For the epilimnion of lakes, ponds, and
impoundments, minimum daily average of 5.0 mg;l, no value
1 ess than 4.0 mg/1.
b$ - For lakes, ponds and impoundments only, no value
less than 5.0 mg/1 at any point.
bg - Minimum daily average 7.0 mg/1, no value less than
6.0 mg/1.
Puerto Rico	Class SA,SR 5.0 mg/1 min.
Class SC - 4.0 mg/1 min.
CI ass SD (PWS)5.0 mg/1 Min. except for 4 hours within any
24 hour period when it can be no less than 4.0 mg/1.
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State
Cold Water	Warm Water
Fishery	F i shery	Mi seel 1aneous
Rhode Island
South Carolina
**Class A S< R: 75% saturation, 16 hours/day 5 mg/1 at
any time.
Class C:	Minimum 5 mg/1 at any time, minimum 4 mg/1
sluggish eutrophic waters.
Class D:	Minimum of 2 mg/1 at any time.
SA:	Not less than 6.0 mg/1 at any time.
SR:	Mot less than 5.0 mg/1 at any time.
SC:	Not less than 5 mg/1 during at least 16
hours of any 24-hour period nor less than
4 mg/1 at any time.
**Class A (swimming) - 5.0 mg/1 minimum, 4.0 mg/1 average
iri swamp waters. Class B - 5.0 mg/1 daily average with a
low of 4.0 mq/1, 4.0 mg/1 average in swamp waters. Tidal
salt waters - 5.0 mg/1 minimum, classes SA and SB, 4.0
mg/1 minimum, Class SC.
AA - average of 6 mg/1 unless natural conditions can be
shown to contribute to values below this.
AA - T rout - maintained at
mg/1; daily ave. of 7 mg/1
their natural condition or 6
South Dakota
Tennessee
SAA - 5.0 mg/1 .
6 mg/1 or 5 mg/1
by stream
5 mg/1
Big Stone and
Trauryse Lakes
Min. 6 mg/1
April and May.
PWS_j_ Industrial
Water S., Recreation, Irrigation,
Livestock Watering & Wildlife & Navigation:
There shall always be sufficient dissolved oxygen present
to prevent odors of decomposition and other offensive
conditions.
Fish & Aquatic Life: The dissolved oxygen shall be
maintained at 5.0 mg/1 except in limited sections of the
stream where (i) existing quality due to irretrievable
man-induced conditions cannot be restored to 5.0 mg/1 DO;
(ii) the cost for application of effluent limitations
more stringent than defined through §301 of FWPCAA is
economically prohibitive when compared with the benefits
to be obtained; or (iii) the natural background quality
of the water is less than the desired minimum of 5.0
mg/1. In these limited sections, a minimum of 3.0
** For explanation of use classifications, see EPA publication, "General
Stream Use Designations."
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State
Cold Water	Warm Water
Fi shery	Fishery	Mi seel 1aneous
Tennessee (cont.) mg/1 dissolved oxygen will be allowed. The DO concentra-
tion shall be measured at mid-depth in waters having a
total depth of ten (10) feet or less and at a depth of 5
feet of water having a total depth of greater than 10
feet. A minimum dissolved oxygen content of 6.0 mg/1
shall be maintained in recognized trout streams.
Dissolved oxygen shall be greater than 6.0 mg/1 unless
reduced by natural causes (FWL).
Dissolved oxygen in surface waters shall not be reduced
from natural conditions (PWS).
Dissolved oxygen shall not be less than 6 mg/1 in all
saline surface waters from other than natural causes.
Texas
Trust Territories
Utah
6 mg/1
4-6 mg/1 by
segment tied to
7 day 2 year
1ow f1ow.
5.5 mg/1
Houston Ship
Channel 2 mg/1 .
Tidal 3 to 5 mg/1 ,
by stream.
PWS - B.O.D. - not
more than 5 mg/1
20% of the time -
not more than 10
mg/1 10% of the
time.
Vermont	**Type I Waters
Streams and rivers sustaining natural populations of
brook trout, salmon, rainbow trout and brown trout.
Dissolved oxygen content of these waters at near spawning
areas not less than 7 mg/1; not less than 6 mg/1 in
non-spawning areas.
Type II Waters
Streams and rivers sustaining mixed populations of trout
and bass not less than 6 mg/1.
Type III Waters
Warm water streams not less than 5 mg/1.
Type IV Waters
Oligotrophic lakes, ponds and reservoirs sustaining
natural populations of trout and salmon not less than 6
mg/1.
Type V Waters
Other lakes and ponds not less than 5 mg/1.
** For explanation of use classifications, see EPA publication, "General
Stream Use Designations."
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Cold Water	Warm Water
State	Fishery	Fi shery	Miscellaneous
Virginia	Major CI ass I	Mi nimum	Daily Average
Open Ocean (Seaside
of the Land Mass) 5.0	None
Major CI ass 11
Estuarine (Tidal
Water - Coastal
Zone to Fall Line)
4.0	5.0
Major Class III
Free Flowing Streams
(Coastal Zone and
Piedmont Zone to the
Crest of the Moun-
tains)	4.0	5.0
Major CI ass IV
Mountainous Zone 4.0	5.0
Major CI ass V
Put and Take Trout
Waters
5.0
6.0
Virgin Islands
Washington
Major CI ass VI
Natural Trout Waters 6.0
Class A - Natural conditions
CI ass R - 5.5 mg/1 min.
CI ass C - 5.0 mg/1 min.
**C1ass AA - 9.5 mg/1
Class A - 8.0 mg/1
Class ^ - 6.5 mg/1 or 70?,
saturation, whichever is
greater.
Class C -
7.0
Marine Water -
CI ass AA-7.0 mg/1
CI ass A-6.0 mg/1
CI ass 8-5.0 mg/1
or 70% saturation,
whichever is
greater.
CI ass C-4.0 mg/1
or 50% saturation,
whichever is
greater.
Lake Class - No measurable decrease from natural.
West Virginia
Not less than 5 mg/1 at any time except in Knawha River
and Ohio River where it is 5 mg/1 ave. , 4 mg/1 min.
** For explanation of use classifications, see EPA publication, "General
Stream Use Designations."
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Cold Water	Warm Water
State	Fi shery	Fi shery	Mi seel 1aneous
Wisconsin	Standards for Fish and Aquatic Life
Fxcept for waters classified as trout streams in
Wisconsin Trout Streams, Publication 213-72, the
dissolved oxygen content in surface waters shall not be
lowered to less than 5 mg/1 at any time.
Streams classified as trout waters by the Department of
Natural Resources (Wisconsin Trout Streams, Publicatior
213-72) shall not be altered from natural background by
effluents that influence the stream environment to sucr.
an extent that trout populations are adversely affected.
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 the 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
Dissolved oxygen shall not be less than 3 mg/1.
Marginal Surface Waters
Dissolved oxygen shall not be less than 2 mg/1.
Wyoming	6 mg/1	6 mg/1
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United States
Environmental Protection
Agency
Washington DC 20460
Postage and Fees Paid
Environmental Protection Agency
EPA-335
Official Business
Penalty for Private Use $300
Third-Class

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