800R80902
NITROGEN - AMMONIA/NITRATE/NITRITE
Water Quality Standards
Criteria Summaries
A Compilation of State/Federal Criteria
September 1980
U. S. Environmental Protection Agency
Office of Water Regulations and Standards
Washington, D. C. 20460
* * .'
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NATIONAL SUMMARY
OF
STATE WATER QUALITY STANDARDS
NITRATES/NITRITES/AMMONIA
SEPTEMBER, 1980
PREPARED FOR
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
CRITERIA AND STANDARDS DIVISION
401 M STREET, S. W.
WASHINGTON, D. C. 20460
PREPARED BY
NALESNIK ASSOCIATES INCORPORATED
505 ELEVENTH STREET, S. E.
WASHINGTON, D. C. 20003
Contract Number 68-01-6058
Project Number WA-80-A055
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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.
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 publication Quality Criteria for Water (QCW),
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.
Criteria for ammonia, nitrate or nitrite nitrogen in State water quality standards
are the subject of this digest. Ammonia in most waters is a biological degradation
product of nitrogenous organic matter. When dissolved in water, ammonia will
react with the water to form ammonium ions. Ammonium can also be released
from proteinaceous organic matter and urea, or synthesized from nitrogen fixation.
Nitrate is formed from the complete oxidation of ammonium by certain micro
organisms in which nitrite is an intermediate product. In well oxygenated waters
nitrite is readily oxidized to nitrate. The rationale for establishing water quality
criteria for these three common molecular forms of nitrogen are:
(1) ammonia toxicity to aquatic life is well documented and its
toxicity is directly dependent on the pH of the water in which it is
dissolved;
(2) growing plants assimilate nitrate and ammonium ions into plant
proteins; and
(3) both nitrate and nitrite nitrogen are toxic to aquatic life where
specific concentrations of either are reached in a waterbody.
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To prevent the nuisance and toxic effects of any of the nitrogen forms, the
1976 Quality Criteria for Water recommends the following criteria:
0.02 mg/1 (as un-ionized ammonia) for freshwater aquatic life.
Concentrations of total ammonia (NH, + NtL ) which contair
ionized ammonia concentration of 0.020 mg/1 l?Ho(mg/l)
160.
110.
73.
50.
35.
51.
34.
23.
16.
11.
16.
11.
7.3
5.1
3.5
5.1
3.4
2.3
1.6
1.1
1.6
1.1
0.75
0.52
0.37
0.53
0.36
0.25
0.18
0.13
0.18
0.13
0.093
0.070
0.055
0.071
0.054
0.043
0.036
0.031
0.036
0.031
0.027
0.025
0.024
Temper- pH Value
ature
(°C) 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0
10...
15...
20...
25...
30... 25. 7.9 2.5 0.81 0.27 0.099 0.045 0.028 0.022
10 mg/1 nitrate nitrogen (N) for domestic water supply (health).
Since water quality standards experience revisions and upgrading from time to
time, following procedures set forth in the Clean Water Act, individual entries in
this digest may be superseded. As these revisions are accomplished and allowing
for the States to revise their standards accordingly, this digest will be updated and
reissued. Because this publication is not intended for use other than as a general
information resource, to obtain the latest information and for special purposes and
applications, the reader needs to refer to the current approved water quality
standards. These can be obtained from the State water pollution control agencies
or the EPA or Regional Offices.
Individual State-adopted criteria follow:
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REFERENCES
A
California Water Quality Standards by River Basins, c.a. 1975
For more detailed information on selected basins, sub-basins
and stretches of streams and coastal areas refer to California
State Water Quality Standards.
B Delaware Water Quality Standards, March 25, 1979
r>
Idaho Water Quality Standards, c.a. September, 1979
Missouri Water Quality Standards, c.a. February, 1978
g
American Samoa Water Quality Standards,
Revised July, 1973
F Territory of Guam Water Quality Standards, Sept. 1975
Trust Territory of the Pacific Islands Water Quality
Standards, October 21, 1973
H Virgin Islands Water Quality Standards, Aug. 1973
ENVIRONMENT REPORTER, The Bureau of National Affairs, Inc.
Washington, D. C. 20037
1 Pages 701:0501-0509, February 16, 1979
2 Pages 706:1004-1008, July 20, 1979
3 Pages 711:0542-0544, August 5, 1977
4 Pages 716:0603, March 26, 1976
5 Pages 726:1005, 1011-1013, March 7, 1980
Basic Water Quality Standards adopted May 22, 1979,
have not yet been submitted to EPA for formal approval.
6 Pages 731:1002-1009, September 8, 1978
7 Pages 746:1008-1014, October 19, 1979
8 Pages 751:0504-0505, January 25, 1980
9 Pages 765:0512-0515, January 30, 1976
10 Page 761:0503-0504, 1973
111
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11 Page 766:0504-0509, October 5, 1979
12 Pages 771:0502-0504, September 29, 1978
13 Pages 776:0504-0506, April 10, 1979
14 Pages 781:0501-0502, May 18, 1979
15 Pages 786:0501-0502, August 29, 1975
16 Page 791:0583, May 26, 1978
17 Pages 796:0103-0108, February 16, 1979
i p
Pages 801:1001-1002, Sept. 29, 1978
19
Page 806:1003, March 30, 1979
Of)
Page 811:1043, 1974
21 Pages 816:0602-0607, 0642-0648, 1974
99
Pages 821:0502-0505, June 30, 1978
0-3
Pages 831:0501-0510, February 21, 1975
04.
Page 836:0502, June 30, 1978
OK
Pages 841:0507-0537, December 7, 1979
26 Pages 846:0501-0508, November 17, 1978
97
Pages 851:1001-1023, December 15, 1978
OQ
Pages 856:1001-1002, July 18, 1978
on
Pages 861:1002-1007, August 11, 1979
•jfi
Pages 866:1004-1009, December 28, 1979
31 Pages 871:0501-0506, November 25, 1977
•JO
Pages 876:1001-1043, May 26, 1978
QQ
Pages 881:1001-1007, September 21, 1979
•>A
Pages 886:0513-0524, August 29, 1975
•JC
Pages 891:1001-1129, November 16, 1979
iv
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36 Pages 901:0501-0505, November 3, 1978
37 Pages 906:0501-0506, October 13, 1978
38 Pages 911:0501-0507, June 22, 1979
39 Pages 916:0541-0544, April 14, 1978
40 Pages 921:1001-1003, August 13, 1976
41 Pages 926:0541-0563, January 26, 1979
42 Pages 931:0501-0508, May 26, 1978
43 Pages 936:1001-1003, June 27, 1975
44 Pages 941:1001-1005, May 26, 1978
45 Pages 946:0501-0520, July 14, 1978
46 Pages 951:1002-1003, April 28, 1978
47 Pages 956:1001-1007, January 11, 1980
48 Page 741:1002, November 23, 1979
49 Pages 896:0301-0310, March 31, 1978
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NITRATES/NITRITES/AMMONIA
State
Alabama
Alaska2
Arizona"*
1
Criteria Values in mg/1
Not specified
Not specified
A. The mean annual total nitrate concen-
trations of the following waters shall not
exceed the values given below nor shall
the total nitrate concentrations of more
than 10 percent of the samples in any
year exceed the 90 percent values given
below. Unless otherwise specified, indi-
cated values also apply to tributaries to
the named waters.
Total nitrates as NO3 mg/1
4 Mean annual
7 90 pet-value
5 Mean annual
5 Mean annual
7 90 pet-value
5 Mean annual
7 90 pet-value
B. The above standards are intended to
protect the beneficial uses of the named
waters. Because regulation of nitrates
and phosphates alone may not be adequate
to protect waters from eutrophication, no
substance shall be added to any surface
water which produces aquatic growth to
the extent that such growths create a
public nuisance or interference with bene-
ficial uses of the water defined and desig-
nated in Reg. 6-2-6.5.
Designated Stream Use
All
All
Colorado River from Utah
border to Willow Beach
(main stem)
Colorado River from
Willow Beach to Parker
Dam (main stem)
Colorado River from
Parker Dam to Imperial
Dam (main stem)
Colorado River from
Imperial Dam to Morelos
Dam (main stem)
-1-
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State
Arkansas
Criteria Values in mg/1
Not specified
Nutrients - The naturally occurring nitro-
gen/phosphorus ratio shall not be signifi-
cantly altered due to municipal, indus-
trial, agricultural or other waste dis-
charges, nor shall total phosphorus exceed
100 ug/1 in streams or 50 ug/1 in lakes and
reservoirs due to any such discharges.
Designated Stream Use
All
CaliforniaA
Colorado"
Nitrates + total nitrites
10
100
Ammonia - not specified
Un-ionized ammonia - some basins
Note: See California State Water
Standards for specific rivers, basins and
coastal waters.
Ammonia (as N)
0.02 (un-ionized)
0.06 (un-ionized)
0.5
Nitrate (as N)
1001
10
Nitrite (as N)
0.05
0.5
101
1.0
In order to provide a reasonable margin
of safety to allow for unusual situations
such as extremely high water ingestion or
nitrite formation in slurries, the NO«-N
plus NOn-N content in drinking waters for
livestock and poultry should be limited to
100 ppm or less, and the NO«-N content
alone be limited to 10 ppm or less.
All
Livestock watering
(Basin 3)
All
Cold water biota
Warm water biota
Domestic water supply
Agriculture
Domestic water supply
Cold water biota
Warm water biota
Agriculture
Domestic water supply
-2-
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State
Connecticut
D
Delaware
Florida7
a
Georgia
q
Hawaii
Idaho10
Illinois
Criteria Values in mg/1
Not specified
Ammonia - N 0.4
Total nitrogen 3.0
Nitrate - 10.0 as N or that concentration
determined in Nutrients below
Nitrite - Not specified
Ammonia (un-ionized) 0.02
Nutrients - In no case shall nutrient con-
centrations of a body of water be altered
so as to cause an imbalance in natural
populations of aquatic flora and fauna.
Not specified
Total nitrogen, not greater than
0.10 mg/1
Total nitrogen, not greater than
0.15 mg/1
Total nitrogen, not greater than
0.20 mg/1
Not specified
Ammonia (as N) 1.5 mg/
Ammonia Nitrogen as N. (Storet No.
00610). No effluent from any source
which discharges to the Illinois River, The
DesPlaines River downstream of its con-
fluence with the Chicago River System,
or the Calumet River System, and whose
untreated waste load is 50,000 or more
population equivalents shall contain more
than 2.5 mg/1 of ammonia nitrogen as N -
Designated Stream Use
All
Public water supply
Public water supply
Public water supply
All
Public water supply, shell-
fish, recreation
Public water supply, shell-
fish, recreation
Class AA
Class A
Class B
All
All waters except
secondary contact and
indigenous aquatic life and
Lake Michigan
Secondary contact and
indigenous aquatic life
waters
-3-
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State
Criteria Values in mg/1
Designated Stream Use
Illinois
(con't)
Indiana1^
during the months of April through
October, or 4 mg/1 at other times, after
December 31, 1977. Sources discharging
to any of the above waters and whose
untreated waste load cannot be computed
on a population equivalent basis compar-
able to that used for municipal waste
treatment plants and whose ammonia nit-
rogen discharge exceeds 100 pounds per
day shall not discharge an efffluent of
more than 3.0 mg/1 of ammonia nitrogen
after December 31, 1974.
0.02 mg/1
10.0 mg/1 Nitrate-Nitrogen
1.0 mg/1 Nitrite-Nitrogen
The bioassay criterion for toxic sub-
stances of 1/10 x 96 hr TLM applies to
ammonia in all waters except those listed
in the specific standards as follows:
Unionized Ammonia
0.03 mg/1 - Monthly Ave.
0.1 mg/1 - Daily Max.
0.02 mg/1 Monthly Ave.
0,05 mg/1 - Daily Max.
1.5 mg/1 total Ammonia Nitrogen
0.02 mg/1 Unionized Ammonia
All Lake Michigan Waters
Public and Food Processing
water supply
Public and Food Processing
water supply
Inner Harbor, Gary Harbor,
Burns Harbor
Lake Michigan
Grand Calumet River and
Indiana Harbor Ship Canal
Wolf Lake and Wolf Lake
Harbor
Ammonia
Toxic Substances: The concentration of
toxic substances shall not exceed those
values listed in the United States Environ-
mental Protection Agency Administrator's
Quality Criteria for Water 1976 for the
protection of sensitive aquatic life.
(For Ammonia this value is 0.02 mg/1
NH3)
Toxic Substances: Not to exceed one-
tenth of the 96-hour median tolerance
limit of salmonid fishes or the natural
Natural Spawning and
Rearing or Imprinting
Areas for Salmonid Fishes
Migration Routes for
Salmonid Fishes
-4-
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State
Criteria Values in mg/1
Designated Stream Use
Indiana
(con't)
Iowa
13
biota obtained from continuous flow bio-
assays where the dilution water and toxi-
cant are continuously renewed, except
that other lower application factors may
be used in specific cases when justified on
the basis of available evidence.
Nitrates and Nitrites:
Plant Nutrients: Free from substances
attributable to municipal, industrial, agri-
cultural or other sources in concen-
trations or combinations which will cause
or contribute to the growth of aquatic
plants or algae in such degree as to create
a nuisance, be unsightly or deleterious, or
be harmful to salmonid fishes or the
natural biota. (Stream Pollution Control
Board of the State of Indiana; SPC 12R,
Sec.B; filed May 26, 1978, 3:30 PM 1 IR
100)
Plant Nutrients: Free from substances
attributable to municipal, industrial, agri-
cultural or other sources in concen-
trations or combinations which will cause
or contribute to the growth of aquatic
plants or algae in such degree as to create
a nuisance, be unsightly or deleterious, or
be harmful to salmonid fishes or the
natural biota.
Ammonia (N)
5 (Nov 1 - March 31)
2 (April 1 - Oct. 31)
2.5 (Nov.] - March 31)
1.0 (April 1 - Oct. 31)
Nitrate (NO,.) 45
Nitrite - Not specified
Natural Spawning and
Rearing or Imprinting
Areas for Salmonid Fishes
Migration Routes for
Salmonid Fishes
Warm water fish and aqua-
tic life, secondary recrea-
tion
Cold water fish and aqua-
tic life, secondary recrea-
tion.
Public water supply
All
Kansas
14
Ammonia: Man-made sources shall not
cause the undissociated ammonium hydro-
xide concentration of waters of the state
to exceed 0.15 mg/1 as N.
All
-5-
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State
Kansas
(con't)
Kentucky
15
Louisiana
16
17
Maine
Maryland
18
Massachusetts
19
Criteria Values in mg/1
Nitrites - Not specified
Ammonia 0.05
Not specified
Nutrients - the naturally occurring nitro-
gen phosphorous ratio shall be maintained.
Not specified
Not specified
The state recognizes that certain waters
of the State are eutrophic or are
approaching eutrophic conditions. All dis-
charges to waters which are eutrophic or
potentially eutrophic, when so identified
by the State, shall be treated as necessary
to reduce eutrophic effects. The State
shall require that wastewaters, containing
nutrients which cause or may cause eutro-
phication be given advanced waste treat-
ment prior to discharge, or be disposed of
by spray irrigation on land, or by other
practicable procedures which will avoid
direct discharge to surface waters.
Nitrate: 10
The discharge of nutrients, primarily
phosphorus or nitrogen, to waters of the
Commonwealth will be limited or prohi-
bited by the Division as necessary to
prevent excessive eutrophication of such
waters. There shall be no new or
increased discharges of nutrients into
lakes and ponds, or tributaries thereto.
Existing discharges containing nutrients
which encourage eutrophication or growth
of weeds or algae shall be treated. Acti-
vities which may result in non-point dis-
charges of nutrients shall be conducted in
Designated Stream Use
All
All
All
All
All
Public water supply
-6-
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State
Criteria Values in mg/1
Designated Stream Use
Massachusetts
(con't)
accordance with the best management
practices reasonably determined by the
Division to be necessary to preclude or
minimize such discharges of nutrients.
Michigan
20
Not specified
Nutrients originating from domestic,
industrial, municipal or domestic animal
sources shall be limited to the extent
necessary to prevent stimulation of
growths of aquatic rooted, attached and
floating plants, fungi or bacteria which
are or may become injurious to the desig-
nated uses of the waters of the state.
(1) Toxicity of undefined toxic substances
am specifically included in subrules (2)
vid (3) shall be determined by develop-
ment of 96-hour TLM's or other appro-
priate effect and points obtained by
continuous flow or in situ bioassays using
suitable test organisms. Concentrations
of undefined toxic substances in the
waters of the State shall not exceed safe
concentrations as determined by applying
an application factor, based on knowledge
of the behavior of the toxic substances
and the organisms to be protected in the
environment, to the TLM or other appro-
priate effect end point.
(2) For all waters of the State, unless on
the basis of recent information, a more
restrictive limitation is required to
protect a designated use, concentrations
of defined toxic substances, including
heavy metals, shall be limited by
application of the toxic substances,
recommendations contained in the
chapter on Freshwater Organisms,
"Report of the National Technical
Advisory Committee to the Secretary of
the Interior, Water Quality Criteria,
1968," or by application of any toxic
effluent standard, limitation or prohi-
bition promulgated by the Administrator
of the United States Environmental
Protection Agency pursuant to section
307(a) of the United States Public Law
92-500, whichever is more restrictive.
All
All
-7-
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State
Criteria Values in mg/1
Designated Stream Use
Michigan
(con't)
(3) In addition to the standards prescribed
in subrules (1) and (2), waters of the State
used for public water supply shall, at the
point of water intake, not exceed the
permissible inorganic and organic
chemicals criteria for raw public water
supply in "Report of the National
Technical Advisory Committee to the
Secretary of the Interior, Water Quality
Criteria, 1968," except that chlorides
shall be limited to the same extent as
prescribed by rule ] 051(2).
Minnesota
21
Nitrates (NOJ 45.0
0.2 Ammonia (N)
1.0
Domestic water supply
Classes A, B, and C
Fisheries and recreation
(Class A)
Fisheries and recreation
(Class B)
1.5
Unspecified toxic substances - none at
levels harnful either directly or indirectly.
Fisheries and recreation
(Class C)
Agriculture and wildlife
(Class B)
22
Mississippi
Not specified
All
Missouri
.D
0.1 Ammonia nitrogen
0.02
10.0 Nitrate nitrogen
Aquatic life
Coldwater fishery
Drinking water supply
Montana
23
Not specified
All
Nebraska
24
Ammonia as N- Seasonal limits assigned
to each designated stream segment with
limits ranging from 1 to 6 mg/L.
All
Nevada
25
Nitrates (NO~)
0.8-7.66 Single Value
.07-5.0 Annual average
Variable
Variable
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State
Criteria Values in mg/1
Designated Stream Use
Nevada
(con't)
26
Nitrates (NOJ
1.0 - 5.0 Single Value
.09-1.5 Annual Average
Single value and annual average varies for
each basin. See Water Pollution Rules,
Table 1 thru 55 for specific rivers, lakes,
and streams.
New Hampshire Not specified
Variable
Variable
All
New Jersey
27
Ammonia or ammonium compounds:
None, either alone or in combination with
other substances, in such concentrations
as to affect humans or be detrimental to
the natural aquatic biota, produce
undesirable aquatic life, or which would
render the waters unsuitable for the desi-
gnated uses. Where sources of public
water supply is potential use, none which
would cause standards for drinking water
to be exceeded after appropriate
treatment.
Nitrate Nitrogen 2.0
3.0
All
All uses in FW-central Pine
Barrens
All uses in FW-lower
Mullica and Wading Rivers
Central Pine Barrens.
New Mexico
28
Not specified
Surface waters shall be free of nitrogen
and other dissolved gasses at levels above
110% saturation when supersaturation is
attributable to municipal, industrial or
other discharges.
All
New York
29
Nitrates: Not specified
Nitrites: Not specified
Ammonia or ammonium compounds: 2.0
as NHL at pH of 8.0 or above
O
All
All
Water supply source for
drinking, culinary or food
processing; fish life
-9-
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State
North Carolina
30
Criteria Values in mg/1
10.0 Nitrate nitrogen
Designated Stream Use
Drinking water supply
(treatment plus disin-
fection)
North Dakota
31
Ohio32
Nitrates: 1.0 - 1.5 (depending upon type of
drinking water treatment process utilized)
NO3 as N: 0.375 (goal)
Ammonia: 0.1 - 13.0 depending upon tem-
perature and pH
The concentration of un-ionized ammonia
(NHJ shall not exceed 0.05 mg/1, un-
ionized ammonia shall be determined for
values for total ammonia N, pH and tem-
perature and the following equation:
Un-ionized ammonia = 1.3^|total ammo-
nia-N)/ 1 + 10 ^p a " p ; where pk =
0.0902 + 2730/273.2 + T) and T = Templ-
rature in degrees C
Nitrate-N plus Nitrite-N: 10.0
Nitrite-N: 1.0
Nitrate-N: 10.0
Nitrates plus nitrites: 100.0
Ammonia as Nitrogen
0.2 - 13.0 mg/1 depending on temperature
and pH
0.1 - 6.5 mg/1 depending on temperature
and pH
1.5 - 12.8 mg/1 depending on temperature
and pH
0.2 - 13.0 mg/1 depending on temperature
and pH except as indicated for specific
streams
Nitrate - N; 10.0 mg/1
Nitrates plus nitrites: 100.0 mg/1
All
All lake uses
All except Ohio River uses
All Ohio River uses
All Ohio River uses
All Ohio River uses
Public water supply
Agricultural water supply
Warm water habitat
Lake Erie, exceptional
warm water and cold water
habitat
Seasonal
habitat
limited
habitat
warm water
warm
water
Lake Erie and public water
supply
Lake Erie and agricultural
water supply
-10-
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State
Ohio
(con't)
Criteria Values in mg/1
Ammonia not greater than 12.0 mg/1 from
12/1/74 to 6/30/76; nor greater than 8.0
mg/1 from 7/1/76 to 1/1/79
Toxic substances less than 1/10 x 96 hr
TLM
(Applies to Ammonia)
Designated Stream Use
Lower Cuyahoga River
Mahoning River
Oklahoma
33
Nitrates as N: 10.0
Drinking water supply
Oregon
34
Not specified
All
35
Pennsylvania
Nitrite plus Nitrate:
10.0 (as nitrogen)
Ammonia nitrogen:
0.5 - 1.5
Note: See Drainage lists A through E of
Pennsylvania Water Quality Standards for
applicable uses and streams
All
Rhode Island
36
37
South Carolina
Not specified
Chemical constituents narrative: bio-
assays shall be performed as required-
Chemical constituents narrative: the
limit prescribed by the USEPA will be
used where not superseded by more strin-
gent state requirements.
Not specified
All
Fisheries (fresh water)
Public drinking water
supplies (fresh water)
All
South Dakota
38
10.0 Nitrates
50.0
0.02 un-ionized Ammonia (as N)
0.04 un-ionized ammonia (as N)
0.05
Domestic water supply
Wildlife propagation
Domestic water supply,
cold water fish
Warm water fish (perma-
nent and semi-permanent)
Warm water fish (marginal)
-11-
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State
South Dakota
(con't)
Tennessee
Texas40
Utah41
39
Criteria Values in mg/1
Nitrites: Not specified
Not specified
Not specified
NH3 as N 0.02 (un-ionized)
NO3 as N 0.02
Designated Stream Use
All
All
All
Aquatic life
Aquatic life, recreation
and aesthetics
Vermont
42
There shall be no discharge of wastes to
Class A waters that do not meet or
exceed the technical and other require-
ments for such waters nor shall there be
any discharge of wastes containing any
form of nutrients which would encourage
eutrophication or growth of weeds or
algae.
There shall be no new or increased dis-
charge of wastes after May 27, 1971
containing any form of nutrients which
would encourage eutrophication or growth
of weeds and algae in any lake, pond or
reservoir. Any discharge of wastes
existing prior to May 27, 1971 containing
soluble or other nutrients which would
encourage eutrophication or growth of
weeds and algae in any lake, pond, or
reservoir shall receive the highest
practical degree of treatment currently
available to remove such nutrients.
All
Virginia
44
Washington
45
West Virginia
Wisconsin***
Nitrates plus nitrites: 10.0 (as N)
Not specified
45.0 Nitrates
NII3-N
3.0 mg/1 during warm temperature
6.0 mg/1 during cold temperatures
Public water supply
All
All
Intermediate aquatic life
waters
-12-
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State
.47
Wyoming
American Samoa
District of
Columbia
Guam
Puerto Rico
49
Criteria Values in mg/1
0.02 Ammonia as (N)
The naturally occurring atomic ratio of
NO,-N to PCL-P in a body of water will
be maintained. Similarly, the ratio of
inorganic phosphorus (orthophosphate) to
total phosphorus (the sum of inorganic
phosphorus, dissolved organic phosphorus,
and particulate (phosphorus) will be main-
tained in the ratio and amount as it
occurs in the receiving waters naturally.
Ammonia - 0.02 mg/1 as unionized
ammonia
Nitrates/Nitrites - 10 mg/1 max. as
nitrate (N)
Total nitrogen shall not exceed
0.40 mg/1
Total nitrogen shall not exceed
0.75 mg/1
Total nitrogen shall not exceed
1.5 mg/1
10.0 N rate plus Nitrite (as N)
5.0 Nitrogen (NO2,
G
Trust Territories 0.01 Ammonia (N)
Virgin Islands
H
The naturally occurring ratio of the
concentrations of nitrogen to phosphorus
will be maintained in all waters.
Not specified
Designated Stream Use
All cold water fisheries
All
All waters
Domestic water supply
AA
A, 2b-I, 2b-II, C
2a-I, 2a-II
All surface waters
All coastal waters
Drinking water supply
All
All
-13-
O-U.S. GOVERNMENT PRINTING OFFICE: 1980- 341-082/107
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