DISCLAIMER
This publication was prepared by Battelle under contract to
the U.S. Environmental Protection Agency (Contract 68-03-3534).
Secondary information sources were used to compile data presented
in this document. Each State was given an opportunity to review
and provide comments on a draft of this information document. In
no event shall either the United States or Battelle have any
responsibility or liability for any use, misuse, or reliance upon
the information contained herein, nor does either warrant or
otherwise represent in any way the accuracy, adequacy, efficacy,
or applicability of the contents hereof.
The reader should consult the water quality standards of a
particular State for exact regulatory language applicable to that
State. Copies of State water quality standards may be obtained
from the State's Water Pollution Control Agency or its
equivalent.
Additional information may also be obtained from the:
Standards Branch
Criteria and Standards Division (WH-S85)
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: PB89-141618
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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
responsiblity 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
propogation, 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).
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 for 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.
To prevent the nuisance and toxic effects of any of the nitrogen forms, the
1986 Quality Criteria for Water recommends the following criteria:
Ammonia - Except where a locally important species is very sensitive,
freshwater aquatic organisms and their uses should not be affected
unacceptably is:
(1) the 1-hour average concentration of un-ionized ammonia (in mg/L NH-)
does not exceed, more often than once every 3 years on the average, tne
numerical value given by 0.52/FT/FPH/2, where:
FT = 10 - 0.03(20 - TCAP); TCAP < T < 30
-2-
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10 - 0.03(20 - T); 0 < T < TCAP
FPH - 1; 8 < pH < 9
1 + 10 - 7.4 - pH
1.25
; 6.5 < pH < 8
TCAP m 20 C; Salmonids or other sensitive coldvater species present
TCAP » 25°C; Salmonids and other sensitive coldvater species absent
An average period of 1 hour may not be appropriate if excursions of
concentrations to greater than 1.5 times the average occur during the hour; in
such cases, a shorter averaging period may be needed.
(2) The 4-day average concentration of un-ionized ammonia (in mg/L NH-) does.
not exceed, more often than once every 3 years on the average, the average
numerical value given by 0.80/FT/FPH/RATIO, where FT and FPH are as above and:
RATIO = 16; 7.7 < pB < 9
=24; 10 - 7.7 - pH
•; 6.5 < pH < 7.7
1 + 10 - 7.4pH
TCAP - 15°C; Salmonids or other sensitive coldwater species present
= 20°C; Salmonids or other sensitive coldwater species absent
Because these formulas are non linear in pH and temperature, the criterion
should be the average of separate evaluations of the formulas reflective of
the fluctuations of flow, pH, and temperature within the averaging period; it
is not appropriate in general to simply apply the formula to average pH,
temperature, and flow.
Nitrates/Nitrites
10 mg/L 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 of the EPA or Regional Offices.
-3-
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REFERENCES
3 Water Quality Boundaries and Standards (Arizona), Article 2. Surface Water
Quality Standards, A.R.S R18.ll, 1987.
5 California Water Quality Standards by River Basins, ca. 1975
For more detailed information on selected basins, sub-basins and stretches
of streams and coastal areas refer to California State Water Quality
Standards.
9 Florida Administrative Code, Chapter 17-4, 1987 and Florida Administrative
Code, Chapter 17-3, 1988.
11 Hawaii Administative Rules, Title II, Hawaii Department of Health, Chapter
54: Water Quality Standards, 1988.
12 Idaho Department of Health and Welfare Rules and Regulations, Title 1,
Chapter 2, "Water Quality Standards and Wastewater Treatment Requirements",
1980.
13 Illinois Pollution Control Board, Board Order R87-27, 1988
25 Missouri Water Quality Standards, 10 CSR 20-7.031, Rule of Department of
Natural Resources: Division 20 - Clean Water Commission.
27 Nebraska Water Quality Standards, Title 117, Chapter 1, Nebraska Department
of Envronmental Control.
35 Ohio Water Quality Standards, Chapter 3745-1 of the Administrative Code,
Ohio Environmental Protection Agency, 1985.
38 Pennsylvania Water Quality Standards, Department of Environmental
Resources, Title 25. Part 1. Subpart C. Article II. Chapter 93 of
Pennsylvania Code.
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.
48 Water Quality Standards, West Virginia Legislative Rules, State Water
Resources Board, 1985.
51 Water Quality Standards for American Samoa, 1984, pp. 20-25.
53 Revised Guam Water Quality Standards, Guam Environmental Protection Agency,
1984, p. 9.
-4-
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54 Commonwealth of Northern Mariana Islands Marine and Fresh Water Quality
Standards, Commonwealth Register, Vol. 8 No. 5, 1986, p. 4465.
55 Puerto Rico Water Quality Standards Regulation, Environmental Quality
Board, 1983.
56 Marine and Fresh Water Quality Standard Regulations, Trust Territory, 1986,
p. 6.
ENVIRONMENT REPORTER, The Bureau of National Affairs, Inc. Washington, D.C.
20037
4 Pages 716:1005, August 30, 1985
6 Page 726:1011, August 22, 1986
8 Pages 736:1002, :1010, March 28, 1986
9 Pages 746:1010.3 - 1014, December 27, 1985
14 Pages 771:1006, :1008 - :1018, November 29, 1985
15 Pages 776:1005 - 1006, December 26, 1986
16 Page 781:1011 - 1012, March 27, 1987
17 Page 786:1008 - 1010, November 29, 1985
18 Page 791:1006, January 18, 1985
21 Pages 806:1003 - 1004, June 21, 1985
22 Page 811:1004, February 13, 1987
23 Page 816:1006 - 1008, June 25, 1982
28 Page 841:1013, February 22, 1985
30 Pages 851:1006, :1010, April 11, 1986
31 Pages 856:1010 - 1011, June 11, 1982
32 Pages 861:1015, :1024 - :1025, November 29, 1985
33 Page 866:1011, August 29, 1986
34 Pages 871:1003 - 1006, June 7, 1985
36 Pages 881:1003, :1008, September 26, 1986
39 Pages 901:1002 - 1005, August 9, 1985
-5-
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40 Pages 906:1006, :1008, November 29, 1985
41 Pages 911:1004 - 1007, March 22, 1985
45 Page 931:1005, March 22, 1985
46 Page 936:1006.4, February 28, 1986
49 Page 951:1007, December 14, 1984
50 Page 956:1005, July 5, 1985
-6-
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State and Water Use
Criteria Values
Alabama
All
Not specified
Alaska'
All
Not specified
Arizona"
Numeric nutrient standards for total nitrogen (mg/L)
for certain surface vater segments as adopted by the
Council are as follows:
annual mean
90 percentile
single sample maximum
annual mean
90 percentile
single sample maximum
0.60 - annual mean
90 percentile
single sample maximum
20
,00
Verde River and 1.00
Tributaries to 1.50
Bartlett Lake 3.00
White River, Black 0.50
River, Tonto Creek 1.00
and Tributaries 2.00
Salt River and
Tributaries, except
Final Creek and
Tributaries, from
confluence of White and
Black Rivers to Theodore
Roosevelt Lake
Apache, Canyon, Saguaro 0.30 - Annual mean of representative
and Theodore Roosevelt composite samples (taken from
Lakes surface and 2 and 5 meter depths).
1.00 - Maximum for any set of representative composite
samples (taken from surface and 2 and 5 meter depths).
Salt River below
Steward Mountain Dam
to above mouth of
Verde River
Little Colorado River
and Tributaries above
River Reservior in
Greer, South Fork of
Little Colorado above
South Fork Campground;
Water Canyon Creek
above Apache-Sitgreaves
National Forest boundry
0.60 - annual mean
3.00 - single sample maximum
0.60 - annual mean
0.75 - 90 percentile
1.10 - single sample maximum
-7-
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State and Water Use
Criteria Values
Little Colorado River
at Apache County Road
No. 124 crossing
1.80 - single sample maximum
Little Colorado River 0.70 -
above Lyman Lake to 1.20 -
above Amity Ditch 1.50 -
diversion near Arizona
Highway 273 crossing
(applies only when in-
stream turbidity is less
than 50 Nephelometric
Turbidity Units).
Oak Creek Canyon and
the West Fork
1.00
1.50
2.50
annual mean
90 percentile
single sample maximum
annual mean
90 percentile
single sample maximum
Arkansas
All
Not specified
Nutrients - Materials stimulating algal growth shall
not be present in concentrations sufficient to cause
objectionable algal densities or other nuisance
aquatic.vegetation.
CaliforniaJ
All
Livestock Watering
(Basin 3)
All
All
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.
Colorado
Aquatic Life Class 1
Cold Water Biota
Un-ionized Ammonia (mg/1 as N)
Chronic * 0.02 .
Acute = 0.43/FT/FPH/2W
Nitrite^ - established on case-by-case basis.
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State and Water Use
Criteria Values
Life Class 1
Varm Vater Biota
Un-ionized Ammonia (mg/1 as N)
Chronic = 0.06 ,,,
Acute = 0.62/FT/FPB/2^ '
Nitrite^ ' - established on case-by-case basis.
Aquatic Life Class 2
Drinking Water Supply
Agriculture
Un-ionized Ammonia (mg/1 as N)
Acute = see note (1)
Chronic = 0.02 (cold water)
water)
Un-ionized Ammonia (mg/1 as N)
0.5U; 30-day avg.
Nitrite - 1.0^)(6) 1-day avg.
Nitrate - KPb; 1-day avg.
0.06 - 0.10(1) (warm
Nitrite -
Nitrate -
avg.
(1) For class 2 warm water aquatic life segments,
where table value standards are to be applied, a
specific chronic standard in the 0.06 to 0.10 mg/1
range for un-ionized ammonia shall be selected based
upon the aquatic life present or to be protected and
whether the waters have been adversely impacted by
factors other than ammonia. The Commission may
consider a standard higher than 0.08 mg/1 un-ionized
ammonia where a higher risk of sublethal effects is
justified by habitat limitations or other water
quality factors. Where a site-specific study has been
conducted, the Commission may apply appropriate
alternative chronic standards in accordance with
section 3.1.7(l)(b)(iii). Acute standards for cold
and warm water class 2 segments generally shall be
established at the respective levels listed in table
II for class 1 segments, except where site-specific
information submitted justifies an alternative acute
standard.
(2) To be applied at the point of water supply intake.
(3) 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 NO^-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.
FT = 10
FT = 10C'"V~~ •'; OCTCTCAP
TCAP = 20°C cold water aquatic life species present
TCAP = 25°C cold water aquatic life species absent
-9-
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State and Vater Use
Criteria Values
FPH
FPH
6.5
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State and Water Use
Criteria Values
Shellfish Propogation
or Harvesting,
Surface Waters
of a body of vater be altered so as to cause an
imbalance in natural populations of aquatic flora and
fauna.
Ammonia(unionized) - shall not exceed 0.02 mg/L.
Nutrients - In no case shall nutrient
concetrations of a body of water be
altered so as to cause an imbalance
populations of aquatic flora and fauna.
in natural
Recreation, Surface
Waters
Ammonia(unionized) - shall not exceed
0.02 mg/L in predominantly fresh waters.
Nutrients - In no case shall nutrient concentrations
of a body of vater be altered so as to cause an
imbalance in natural populations of aquatic flora and
fauna.
Georgia
Hawaii11
Streams
10
Estuaries
(except Pearl Harbor)
Not specified
Total Nitrogen (N/L):
Geometric Mean should not exceed 0.25 mg/L in the wet
season (Nov. 1 to Apr. 30) and 0.18 mg/L in the dry
season (May 1 to Oct. 31).
value not to exceed 0.52 mg/L in the wet season
mg/L in the dry season more than 10% of the
Single
and 0.38
time.
Single
season
value not to exceed 0.80 mg/L in the wet
and 0.06 mg/L in the dry season more than 2% of
the time.
Nitrate + Nitrite ([N03 + N02] - N/L):
Geometric Mean should not exceed 0.07 mg/L.
Single value not to exceed 0.18 mg/L more than 10% of
the time.
Single value not to exceed 0.30 mg/L more than 2% of
the time.
Total Nitrogen (N/L):
Geometric Mean should not exceed 0.20 mg/L.
Single value not to exceed 0.35 mg/L more than 10% of
the time.
Single value not to exceed 0.50 mg/L more than 2% of
the time.
Nitrate + Nitrite ([N03 + N02] - N/L):
Geometric Mean should not exceed 0.008 mg/L.
Single value not to exceed 0.025 mg/L more than 10% of
-11-
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State and Water Use
Pearl Harbor Estuary
Embayments
Criteria Values
the time.
Single value
the time.
not to exceed 0.035 mg/L more than 2% of
Ammonia Nitrogen (NH.-N/L):
Geometric Mean should not exceed 0.006 mg/L.
Single value not to exceed 0.010 mg/L more than 10% of
the time.
Single value not to exceed 0.020 mg/L more than 2% of
the time.
Total Nitrogen (N/L):
Geometric Mean should not exceed 0.30 mg/L.
Single value not to exceed 0.55 mg/L more than 10% of
the time.
Single value not to exceed 0.75 mg/L more than 2% "of
the time.
Nitrate + Nitrite ([N03 + N02] - N/L):
Geometric Mean should not exceed 0.015 mg/L.
Single value not to exceed 0.040 mg/L more than 10% of
the time.
Single value not to exceed 0.070 mg/L more than 2% of
the time.
Ammonia Nitrogen (NH.-N/L):
Geometric Mean should not exceed 0.010 mg/L.
Single value not to exceed 0.020 mg/L more than 10% of
the time.
Single value not to exceed 0.030 mg/L more than 2% of
the time.
Total Nitrogen (N/L):
Geometric Mean should not exceed 0.20 mg/L in the vet
season* and 0.15 mg/L in the dry season**.
Single value not to exceed 0.35 mg/L in the wet
season* and 0.25 rag/L in the dry season** more than
10% of the time.
Single value not to exceed 0.50 mg/L in the wet
season* and 0.35 mg/L in the dry season** more than 2%
of the time.
Ammonia Nitrogen (NH.-N/L):
Geometric Mean should not exceed 0.006 mg/L in the wet
season* and 0.0035 mg/L in the dry season**.
Single value not to exceed 0.013 mg/L in the wet
season* and 0.0085 mg/L in the dry season** more than
10% of the time.
Single value not to exceed 0.020 mg/L in the wet
season* and 0.015 mg/L in the dry season** more than
2% of the time.
Nitrate + Nitrite ([N03 + N02] - N/L):
Geometric Mean should not exceed 0.008 mg/L in the wet
-12-
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State and Water Use Criteria Values
season* and 0.005 mg/L in the dry season**.
Single value not to exceed 0.02 mg/L in the wet
season* and 0.014 mg/L in the dry season** more than
10* of the time.
Single value not to exceed 0.035 mg/L in the vet
season* and 0.025 mg/L in the dry season** more than
2% of the time.
* "Wet" criteria apply when the average fresh water
inflov from the land equals or exceeds 1% of the
embayment volume per day.
** "Dry" criteria apply when the average fresh water
inflow from the land is less than 1% of the embayment
volume per day.
Applicable to both "wet" and "dry" conditions:
pH Units shall not deviate more than 0.5 units from a
value of 8.1.
Temperature - Shall not vary more than 1°C from
ambient conditions.
Salinity (ppm) - Shall not vary more than 102 from
natural or seasonal changes considering hydrologic
input and oceanographic factors.
Open Coastal Waters Total Nitrogen (N/L):
Geometric Mean should not exceed 0.15 mg/L in the wet
season* and 0.11 mg/L in the dry season**.
Single value not to exceed 0.25 mg/L in the wet
season* and 0.18 mg/L in the dry season** more than
102 of the time.
Single value not to exceed 0.35 mg/L in the wet
season* and 0.25 mg/L in the dry season** more than 2%
of the time.
Ammonia Nitrogen (NH.-N/L):
Geometric Mean should not exceed 0.0035 mg/L in the
wet season* and 0.002 mg/L in the dry season**.
Single value not to exceed 0.0085 mg/L in the wet
season* and 0.005 mg/L in the dry season** more than
102 of the time.
Single value not to exceed 0.015 mg/L in the wet
season* and 0.009 mg/L in the dry season** more than
2% of the time.
Nitrate + Nitrite ([N03 + N02] - N/L):
Geometric Mean should not exceed 0.005 mg/L in the wet
season* and 0.0035 mg/L in the dry season**.
Single value not to exceed 0.014 mg/L in the wet
season* and 0.010 mg/L in the dry season** more than
102 of the time.
-13-
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State and Water Use Criteria Values
Single value not to exceed 0.025 mg/L in the vet
season* and 0.020 mg/L in the dry season** more than
2% of the time.
* "Wet" criteria apply when the open coastal waters
receive more than three million gallons per day of
fresh water discharge per shoreline mile.
** "Dry" criteria apply when the open coastal waters
receive less than three million gallons per day of
fresh water discharge per shoreline mile.
Applicable to both "wet" and "dry" conditions:
pH Units shall not deviate more than 0.5 units from a
value of 8.1.
Temperature - shall not vary more than 1°C from
ambient conditions.
Salinity (ppm) - shall not vary more than 102 from
natural or seasonal changes considering hydrologic
input and oceanographic factors.
Oceanic Waters Total Nitrogen (N/L):
Geometric Mean should not exceed 0.050 mg/L.
Single value not to exceed 0.080 mg/L more than 10% of
the time.
Single value not to exceed 0.100 mg/L more than 2% of
the time.
Nitrate + Nitrite ([N03 + N02] - N/L):
Geometric Mean should not exceed 0.0015 mg/L.
Single value not to exceed 0.0025 mg/L more than 10%
of the time.
Single value not to exceed 0.0035 mg/L.
Ammonia Nitrogen (NH,-N/L):
Geometric Mean should not exceed 0.001 mg/L.
Single value not to exceed 0.00175 mg/L more than 10%
of the time.
Single value not to exceed 0.0025 mg/L more than 27,
of the time.
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State and Water Use Criteria Values
12
Idaho Warm Water Biota Concentrations of Total Ammonia Not
to Exceed: (3-3-87)
The following daily maximum concentrations for the
specific temperature and pH conditions indicated:
pH/Temp. 5°C 10°C 15°C 20°C
7.00
7.25
7.50
7.75
8.00
26
22
16.3
11.4
7.5
25
20
15.5
• 10.9
;7.i
24
19.7
14.9
10.5
6.9
23
19.2
14.6
10.3
6.8
Maximum allowable Concentrations of Total Ammonia
(mg/1 NH3) (3-3-87)
ii. The following weekly average concentrations for
the specific conditions indicated:
pH/Temp. 5°C 10°C 15°C 20°C
7.00
7.25
7.50
7.75
8.00
2.4
2.4
2.4
2.2
1.44
2.2
2.2
2.2
2.1
1.37
2.2
2.2
2.2
2.0
1.33
2.1
2.1
2.1
1.98
1.31
Maximum allowable Concentrations of Total Ammonia
(mg/1 NH3) (3-3-87)
iii. Where pH and temperature conditions fall outside
the pH and temperature ranges listed in Idaho
Department of Health and Welfare Rules and
Regulations Sections 01.2250,03.6.1. and ii., the
allowable daily maximum and weekly average
concentrations of total ammonia shall be those
values specified for other specific pH and
temperature conditions in EPA's "Ambient Water
Quality Criteria for Ammonia - 1984", EPA document
number 440/5-85-001 dated January 1985. Copies of
EPA's "Ambient Water Quality Criteria for Ammonia
- 1984" may be obtained by requesting document
number PB85-227114 from the National Technical
-15-
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State and Vater Use
Criteria Values
Information Service, 5285
Springfield, Virginia 22161.
Port Royal Road,
(3-3-87)
Cold Vater Biota and Salmonid Spawning Weekly Average
Concentrations of Total Ammonia Not to Exceed:
(3-3-87)
ii. The following weekly average concentrations for
the specific pH and temperature conditions
indicated:
pH/Temp.
5°C
10°C
(3-3-87)
15 °C
20°C
00
25
50
75
8.00
2.4
2.4
2.4
2.2
1.44
2.2
2.2
2.2
2.1
1.37
2.2
2.2
2.2
2.0
1.33
1.49
1.50
1.50
1.40
0.93
Maximum allowable Concentrations of Total Ammonia
(mg/1 NH3) (3-3-87)
Illinois13
General Use Vater
Ammonia Nitrogen and Un-ionized Ammonia:
a) Ammonia nitrogen (as N: Storet Number 31616) shall
in no case exceed 15 mg/L.
b) If ammonia nitrogen is less than 15 mg/L and
greater than or equal to 1.5 mg/L, then un-ionized
ammonia (as N) shall not exceed 0.04 mg/L.
c) Ammonia nitrogen concentrations of less than 1.5
mg/L are lawful regardless of un-ionized ammonia
concentration.
d) For purposes of this section the concentration of
un-ionized ammonia shall be computed according to the
following equation:
U
1.0013 N
;i + 10*)
where:
-16-
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State and Water Use
Criteria Values
0.09018 + 2729.92
Public and Food
Processing
Secondary Contact and
Indigenous Aquatic
Life
Lake Michigan
pH
(T + 273)
U = Concentration of un-ionized ammonia as N in mg/L
N = Concentration of ammonia nitrogen as N in mg/L
T = Temperature in degrees Celcius
e) The following table indicates the maximum ammonia
nitrogen concentrations allowable for certain
combinations of pH and temperature:
Temp
AMMONIA NITROGEN
WATER QUALITY STANDARD (mg/L)
PH
2c(0F)
5 (41)
10 (50)
15 (59)
20 (68)
25 (77)
30 (86)
35 (95)
6.0
15
15
15
15
15
15
15
6.5
15
15
15
15
15
14.9
10.7
7.0
15
15
13.9
9.6
6.7
4.7
3.4
7.5
9.6
6.5
4.4
3.1
2.1
1.5
1.5
8.0
3.1
2.1
1.5
1.5
1.5
1.5
1.5
8.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
9.0
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Nitrate-Nitrogen - 10.0 mg/L (storet number 00620)-
Ammonia, unionized (as N) (storet number 00619):
0.1 mg/L
Ammonia Nitrogen - 0.02 mg/L (storet number 00610)
Indiana14
Ohio River Main Stem Ammonia (un-ionized) - 0.05 mg/L
and Interstate Portion Nitrite-N - 1.0 mg/L
of the Wabash River Nitrate-N + Nitrite-N - 10.0 mg/L
Inner Harbor, Gary
Harbor and Burns
Harbor
Lake Michigan
Un-ionized Ammonia:
Monthly Average - 0.03 mg/L
Daily Max. - 0.10 mg/L
Un-ionized Ammonia:
Monthly Average - 0.02 mg/L
Daily Maximum - 0.05 mg/L
-17-
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State and Water Use
Grand Calumet River
West Branch
East Branch including
Indiana Harbor Ship
Canal
Natural Spawning,
Rearing or Imprinting
Areas; Migration
Routes for Salmonid
Fishes
Criteria Values
Ammonia (un-ionized as NH--N) - 0.05 mg/L
- 0.02 mg/L
Toxic Substances - The concentration of toxic and/or
bioconcentrating substances shall not exceed the
values listed in the following table:
Maximum Ammonia Concentrations
(Un-ionized Ammonia as N)***
(mg/L) n
Temperature ( C)
10 15 20
25
30
6.5
6.6
6.7
6.8
6.9
7.0
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
8.0
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
9.0
.0075
.0092
.0112
.0135
.0161
.0191
.0244
.0260
.0297
.0336
.0374
.0411
.0447
.0480
.0510
.0536
.0537
.0537
.0537
.0537
.0537
.0537
.0537
.0537
.0537
.0537
00106
.0130
.0158
.0190
.0228
.0270
.0316
.0367
.0420
.0474
.0528
.0581
.0631
.0678
.0720
.0758
.0758
.0758
.0758
.0758
.0758
.0758
.0758
.0758
.0758
.0758
.0105
.0183
.0223
.0269
.0322
.0381
.0447
.0518
.0593
.0669
.0746
.0821
.0892
.0958
.1017
.1070
.1071
.1071
.1071
.1071
.1071
.1071
.1071
.1071
.1071
.1071
.0211
.0259
.0315
.0380
.0454
.0539
.0631
.0732
.0837
.0946
.1054
.1160
.1260
.1353
.1437
.1512
.1513
.1513
.1513
.1513
.1513
.1513
.1513
.1513
.1513
.1513
.0299
.0365
.0444
.0536
.0642
.0761
.0892
.1034
.1183
.1336
.1489
.1638
.1780
.1911
.2030
.2135
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.0299
.0365
.0444
.0536
.0642
.0761
.0892
.1034
.1183
.1336
.1489
.1638
.1780
.1911
.2030
.2135
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.0299
.0365
.0444
.0536
.0642
.0761
.0892
.1034
.1183
.1336
.1489
.1638
.1780
.1911
.2030
.2135
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.2137
.2137
*** To calculate total ammonia, divide the number in the
table by the value determined by:
1/(10pka-pH+1)
-18-
-------
State and Water Use Criteria Values
leva15
Class B
Where: pka = 0.09018 + (2729.92/(T + 273.2))
pH = pH of water
T = °C
24 Hour Average Ammonia Concentrations
(Un-ionized Ammonia as N)***
(mg/L)
Temperature ( C)
pH 0 5 10 15 20 25 30
6.5
6.6
6.7
6.8
6.9
7.0
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
8.0
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
9.0
.0005
.0007
.0009
.0011
.0014
.0017
.0022
.0027
.0034
.0043
.0054
.0068
.0086
.0092
.0098
.0103
.0103
.0103
.0103
.0103
.0103
.0103
.0103
.0103
.0103
.0103
.0008
.0010
.0012
.0015
.0019
.0024
.0031
.0038
.0048
.0061
.0077
.0097
.0122
.0130
.0138
.0146
.0146
.0146
.0146
.0146
.0146
.0146
.0146
.0146
.0146
.0146
.0011
.0014
.0017
.0022
.0027
.0034
.0043
.0054
.0068
.0086
.0108
.0136
.0172
.0184
.0196
.0206
.0206
.0206
.0206
.0206
.0206
.0206
.0206
.0206
.0206
.0206
.0015
.0019
.0024
.0031
.0038
.0048
.0061
.0077
.0097
.0122
.0153
.0193
.0242
.0260
.0276
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0015
.0019
.0024
.0031
.0038
.0048
.0061
.0077
.0097
.0122
.0153
.0193
.0242
.0260
.0276
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0015
.0019
.0024
.0031
.0038
.0048
.0061
.0077
.0097
.0122
.0153
.0193
.0242
.0260
.0276
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0015
.0019
.0024
.0031
.0038
.0048
.0061
.0077
.0097
.0122
.0153
.0193
.0242
.0260
.0276
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
.0294
Ammonia Nitrogen (N):
November 1 to March 31
April 1 to October 31
Water
B(W)
5 mg/L
2 mg/L
Uses
B(C)
2.5 mg/L
1.0 mg/L
Class C Nitrate (as N03) - 45 mg/L
-19-
-------
State and Vater Use
Criteria Values
Kansas
Aquatic Life
Un-ionized Ammonia - Artificial sources shall not
cause the un-ionized ammonia concentrations of surface
waters to exceed 0.07 mg/L as NH~-N.
Domestic Water Supply 10.0 mg/L Nitrate (as N)
Kentucky
Varmwater Aquatic
Habitat, Coldwater
Aquatic Habitat
Ammonia - The concentration of the un-ionized form
shall not be greater than 0.05 mg/L at any time in
stream after mixing as illustrated in the table
entitled "Instream Ammonia-N Concentrations," filed
herein by reference. Copies may be obtained from the
Division of Water, Fort Boone Plaza, 18 Reilly Road,
Frankfort, Kentucky 40601.
Domestic Water Supply Nitrate (N03-N, as Total) - 10 mg/L
Louisiana
18
Not specified
Nutrients - The naturally occuring nitrogen-phosphorus
ratio shall be maintained. Because regulation of
nitrates and phosphates alone may not be adequate to
protect waters form 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 interfere with designated water uses.
Detailed studies of the naturally occuring levels of
the various macro- and micronutrients will be utilized
by the state to establish numerical limits for
nutrients. This shall not apply to those waterbodies
determined to be intermittent or man-made as defined
in the Standards.
Maine
19
Maryland
20
Not specified
Not specified
Massachusetts
Class A
21
Nitrate shall not exceed 10 mg/L as nitrogen.
The discharge of nutrients, primarily phosphorus or
nitrogen to surface waters will be limited or
prohibited by the Division (Massachusetts Division of
Water Pollution Control) as necessary to prevent
excessive eutrophication of such waters. There shall
-20-
-------
State and Water Use
Criteria Values
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. Activities which may result in non-point
discharges of nutrients shall be conducted in
accordance with the best management practices
reasonably determined by the Division to be necessary
to preclude or minimize such discharges of nutrients.
Michigan
22
Not specified
Nutrients shall be
prevent stimulation
attached, suspended,
bacteria which are
limited to the extent neessary to
of growths of aquatic rooted,
and floating plants, fungi or
or may become injurious to the
designated uses of the waters of the state.
23
Minnesota
Domestic Water Supply
Classes A, B, and C
Fisheries and Recr.
Class A
Nitrates (NO-) - 45.0 mg/L
Ammonia (unionized as N) - 0.016 mg/L
The percent un-ionized ammonic can be calculated for
any temperature and pH by using the following formula
taken from Thurston, R.V., R.C. Russo, and K. Emerson,
1974. Aqueous ammonia equilibrium calculations.
Technical Report Number 74-1, Fisheries Bioassay
Laboratory, Montana State University, Bozeman, MT. 18
P-
f = --r __ x 100
10
-------
State and Water Use
Criteria Values
Missouri25
Coldvater and Warm
Water Fisheries
Drinking Water Supply
Whole-Body Contact
Recreation
Montana
26
Function of Temperature and pH
Water Quality Standards page 7
Nitrate-Nitrogen - 10 mg/L
Nitrate-Nitrogen - 10 mg/L
Not specified
see Missouri
8.
Nebraska27
Public Drinking Water
Agricultural Class A
Cold Water Habitat
Class A
Class B
Warm Water Habitat
Class A
Class B
Nitrate-nitrogen (as N) - 10 mg/L
Nitrate and Nitrite (as N) - 100 mg/L
Nitrite (as N) - 10 mg/L
Un-ionized Ammonia (as N) - 0.02 mg/L
Un-ionized Ammonia (as N) - 0.04 mg/L
Un-ionized Ammonia (as N) - 0.06 mg/L
Un-ionized Ammonia (as N) - 0.10 mg/L
Nevada28
Various Control Point
Locations
Total Kjeldahl Nitrogen (as N)
Annual Average - 0.29 to 1.25 mg/L
Single Value - 0.36 to 2.67 mg/L
Total Nitrate (as NO-)
Annual Average - 0.4 to 5.0 mg/L
Single Value - 0.6 to 7.1 mg/L
Total Nitrite (as N02)
Annual Average - 0.011 to 0.090 mg/L
Single Value - 0.017 to 0.220 mg/L
Ammonia Nitrogen (unionized)
Single Value - 0.016 mg/L
Single values and annual average values shown here
represent the range of criteria presented for all
control points (sampling sites) in Nevada. Please
refer to tables in section 445.134
Nev Hampshire
29
Not specified
-22-
-------
State and Water Use
Criteria Values
New Jersey
Ftf
30
Nutrients - Except as due to natural conditions,
nutrients shall not be allowed in concentrations that
cause objectionable algal densities, nuisance aquatic
vegetation, or otherwise render the waters unsuitable
for the designated uses.
PL
For Nitrate-Nitrogen a level of 2 mg/L shall be
maintained in the surface waters unless it is shown
that a lower level must be maintained to protect the
existing surface water quality.
The criteria for Nitrate-Nitrogen and pH promulgated
in N.J.A.C. 7:9-4.14(b)l for PL waters apply instead
of the 1981 criteria.
New Mexico31
Coldwater Fishery
Coldwater Fishery
(High Quality)
Un-ionized ammonia (as N) shall not exceed 0.03 mg/L.
Un-ionized ammonia (as N) shall not exceed 0.2 mg/L.
Total
mg/L.
inorganic nitrogen (as N) shall not exceed 1.0
As the need arises, the State shall determine, for
specified stream segments or relevant portions
thereof, whether the limiting nutrient for the growth
of aquatic plants is nitrogen or phosphorus. Upon
such a determination, the waters in question shall be
exempt from the standard for the nutrient found to be
not limiting. Until such a determination is made,
standards for both nutrients shall apply. If
co-limitation is found, the waters in question shall
be exempt from the total inorganic nitrogen standard.
The State shall make available, upon request, a list
of those waters for which the limiting nutrient has
been determined.
New York32
AA, AA-s, A, A-s
(Human)
Ammonia (NH3 + NH4 as N) - 2 mg/L
Nitrate (as N) - 10 mg/L
-23-
-------
State and Water Use
Criteria Values
AA, AA-S, A, A-s
B, C
(Aquatic)
AA, AA-s, A, A-s,
B, C
33
North Carolina
Class VS-II
North Dakota34
Class I, IA, II
Nitrite - 0.10 mg/L in warm water
fishery waters
Nitrite - 0.02 mg/L in cold water fishery waters
AWQC (mg/L) = 0.031[f(T)/g(pH)]
T = temperature in °C
g(pH) - 1 5 if pH > 7.7
g(PH) = lot0'74'7'7 -
f(T) = 1 ; if T > 10°C
1 + 10(9.73 - pH)
------- 7-_ ---- -=T --- ;if
1 + 10(pKT - pH)
0.090 + 2730/(T + 273.2)
AWQC (mg/L) =. 0.15 [f(T) / g(pH)]
g(PH) - 1 + lo'
f(T) as above
f(T)
; if pH < 7.7
10°C
Nitrate nitrogen - 10.0 mg/L
Ammonia (unionized) as N (diss):
0.01 mg/L for no more than 5 days per 30 day period
after acclimation. No concentrations greater that .02
mg/L will be permitted until the department has
nonitored chemical and physical parameters in the
receiving water and its aquatic biota to ensure
sensitive aquatic species are allowed to acclimate to
increased un-ionized ammonia concentrations.
0.05 mg/L for no more than 20 days per 30 day period.
0.02 mg/L for any discharge continuing beyond 20 days.
Nitrates (N) (diss) - 1.0 mg/L
The standards for nitrates (N) and phosphates (P) are
intended as interim guideline limits. Since each
stream or lake has unique characteristics which
determine the levels of these constituents that will
-24-
-------
State and Water Use
Criteria Values
Class III Streams
All Lakes
cause excessive plant growth (eutrophication), the
department reserves the right to review these
standards after additional study and to set specific
limitations on any waters of the state. However, in
no case shall the standard for nitrates (N) exceed ten
mg/L for any waters used as a municipal or domestic
drinking water supply.
Same as above except:
Ammonia (un-ionized) as N - 0.10 mg/L
More restrictive criteria than specified may be
necessary to protect fish and aquatic biota. These
criteria will be developed according to the procedures
in subdivision B of subsection 2 of section
33-16-02-07 (Misc. Provisions).
Generally, the parameter limitations designated for
Class I streams shall apply to all classified lakes.
NO- as N - 0.375 mg/L
Ohio
35
Warmwater and
Exceptional Warmwater
Aquatic Life Habitat
Coldwater Aquatic
Life Habitat
Nuisance Prevention
Public Water Supply
Agricultural Water
Supply
Lake Erie
30-day average Total Ammonia-Nitrogen Criteria:
varies depending on pH and Temperature (See Table 4 in
Ohio Water Quality Standards).
30-day average Total Ammonia-Nitrogen Criteria:
varies depending on pH and Temperature (See Table 5
Ohio Water Quality Standards).
in
Maximum Total Ammonia-Nitrogen Criteria: varies
depending on pH and Temperature (See Table 6 in Ohio
Water Quality Standards).
Nitrate-N: 10 mg/1 maximum
Nitrates + Nitrites: 100 mg/1 maximum
Ammonia; The concentration of un-ionized ammonia
shall not exceed 0.025 mg/1; un-ionized ammonia shall
be determined for values of total ammonia-N, pH and
temperature using the following equation:
zed ammonia
(total ammonia-N)/(l + 10
Where pKa = 0.0902 + 2730/(273.2 +
temperature in degrees C.
T) and T =
-25-
-------
State and Water Use
Ohio River
Criteria Values
At no time shall ammonia-N concentrations exceed 6.5
mg/1.
Nitrate-N; 10.0 mg/1
Nitrate and Nitrite; 100.0 mg/1
Ammonia:
The concentration of un-ionized ammonia
(NBL) shall not exceed 0.05 mg/1; un-ionized ammonia
shall be determined for values of total ammonia-N, pH
and temperature using the following equation:
Un-ionized ammonia =
1.2 (total ammonia-N)(1 +
Where pKa = 0.0902 + 2730/(273.2 + T) and T
temperature in degrees C.
Nitrate-N + Nitrite-N; 10 mg/1
Nitrite-N; 1.0 mg/1
Oklahoma36
Drinking Water
Fish and Wildlife
Nitrates as N - 10.0 mg/L
Total and Un-ionized Ammonia:
Concentrations of ammonia nitrogen containing
un-ionized ammonia levels which are toxic to any
species in the natural climax fish community in
surface waters of hte State shall not be allowed.
Niether shall the concentration of ammonia nitrogen be
allowed to deplete the concentration of dissolved
oxygen below the appropriate standard. In cases where
ammonia toxicity is suspected, the in-situ test
described in subsection 7.3(i) (Toxicity to Aquatic
Organisms) will be initiated with a sensitive
indigenuous species of fish.
Nitrites - Concentrations of nitrites which are toxic
to any species in the natural climax fish community in
suface waters of the State shall not be allowed.
Neither shall the concentrations of nitrites be
allowed to deplete the concentration of dissolved
oxygen below the appropriate standard. In cases where
nitrite toxicity is suspected, the testing procedures
described under 7.3(i) shall apply.
Oregon
37
Not specified
-26-
-------
State and Water Use Criteria Values
38
Pennsylvania
All Ammonia Nitrogen - The maximum total ammonia nitrogen
concentration at all times shall be less than or equal
to the numerical value given by:
un-ionized ammonia nitrogen (NH--N) x (log" [pK_-pH] +
1) where: ^
0.12 x f(T)
un-ionized ammonia nitrogen = ----------
f(pH)
f(PH) = 1 + i0l'03(7.32-pH)
f(T) .1, T > 10°C
i + io<9-73-PH>
f(T) = ------- 7W— --- » T < 10°C
2730
pK«, = 0.090 + -----------
(T + 273.2)
The dissociation constant for ammonia in water.
The average total ammonia nitrogen concentration over
30 consecutive days shall be less than or equal to the
numberical value given by:
Un-ionized ammonia nitrogen (NH--N) x (log-l[pK_-pH] +
1), where:
un-ionized ammonia nitrogen = 0.025 x f(T)/f(pH)
f(pH) = 1, pH > 7.7
f(PH) = io°-74<7-7-PH>, pH < 7.7
f(T) = 1, T > 10°C
f(T) = ------- , T < 10°C
The pH and temperature used to derive the appropriate
ammonia criteria shall be determined by one of the
following methods:
1) Instream measurements, representative of median pH
and temperature - July through September.
2) Estimates of median pH and temperature - July
-27-
-------
State and Water Use Criteria Values
through September - based upon available data or
values determined by the Department.
For purposes of calculating effluent limitations based
on this value the accepted design stream flow shall be
the actual or estimated lowest 30 consecutive day
average flow that occurs once in 10 years.
Nitrite plus Nitrate - not to exceed 10 mg/L as
nitrogen.
39
Rhode Island Not specified
Fresh Water Chemical constituents narrative - Waters shall be free
All from chemical constituents in concentrations or
combinations which could be harmful to human, animal,
or aquatic life for the appropriate most sensitive and
governing water class use or unfavorably alter the
biota.
If an aquatic toxicity value has not been established
in the R.I, DEM Ambient Water Quality Guidelines (see
Appendix B), then the level of any "priority
pollutant" (see Appendix B) shall not exceed the
"detection limits" in the ambient water unless the
discharger demonstrates to the satisfaction of the
Director that a higher concentration will not
adversely effect the most sensitive use of the water
body.
Class A Chemical constituents - The limits prescribed by the
United States Environmental Protection Agency will be
used where not superseded by more stringent State
requirements.
Class B and C Chemical constituents - The ambient concentration of a
pollutant in a water body designated as suitable for
fish and/or wildlife habitat shall not exceed the
Ambient Water Quality Guidelines, (see Appendix B) for
the protection of aquatic organisms from chronic
effects, unless the chronic guideline is modified by
the Director based on results of bioassay tests
conducted in accordance with the terms and conditions
provided in Appendix C.
Class D Chemical constituents - The ambient concentration of a
pollutant in a water body designated as suitable for
fish migration shall not exceed the R.I. DEM Ambient
Water Quality Guidelines (see Appendix B) for the
protection of aquatic organisms from acute effects,
unless the acute guideline is modified by the Director
-28-
-------
State and Water Use Criteria Values
based on results of bioassay tests conducted in
accordance vith the terms and conditions provided in
Appendix C.
Sea Water If an aquatic toxicity value has not been established
in the R.I. DEM Ambient Water Quality Guidelines (see
Appendix B), then the level of any "priority
pollutant" (see Appendix B) shall not exceed the
"detection limits" in the ambient water unless the
discharger demonstrates to the satisfaction of the
Director that a higher concentration will not
adversely effect the most sensitive use of the water
body.
Class SA Chemical constituents - None in concentrations or
combinations which would be harmful to human, animal
or aquatic life or which would make the waters unsafe
or unsuitable for fish or shellfish or their
propagation, impair the palatability of same, or
impair the waters for any other uses.
Class SB Chemical constituents - None in concentrations or
combinations which would be harmful to human, animal
or aquatic life or which would make the waters unsafe
or unsuitable for fish and shellfish or their
propagation, or impair the water for any other usage
assigned to this Class.
Class SC Chemical constituents - None in concentrations or
combinations which would be harmful to human, animal
or aquatic life or which would make the waters unsafe
or unsuitable for fish or shellfish or their
propagation, or impair the water for any other usage
assigned to this Class. The ambient concentration of
a pollutant in a water body designated as suitable for
fish and/or wildlife habitat shall not exceed the R.I.
DEM Ambient Water Quality Guidelines (see Appendix B)
for the protection of aquatic organisms from chronic
effects, unless the chronic guideline is modified by
the Director based on results of bioassay tests
conducted in accordance with the terms and conditions
provided in Appendix C.
40
South Carolina
Class AA and SAA Standards narrative - Natural conditions will be
maintained and protected as feasible, within the
Departments statutory authority.
-29-
-------
State and Vater Use
Criteria Values
South Dakota41
Domestic Vater Supply
Coldvater Permanent
and Marginal Fish
Life Propogation
Warmvater Permanent
and Semipermanent
Fish Life Propagation
Nitrates (as N) may not exceed 10 mg/L with
variation allowed under subdivision 74:03:02:32(1).
Un-ionized ammonia nitrogen may not exceed 0.02 mg/L
(as N) with a variation allowed under subdivision
74:03:02:32(2).
Un-ionized ammonia nitrogen may not exceed 0.04 mg/L
(as N) with a variation allowed under subdivision
74:03:02:32(2).
Varmwater Marginal
Fish Life Propagation
Wildlife Propagation
and Stock Watering
Un-ionized ammonia nitrogen may not exceed 0.04 mg/L
(as N) with a variation allowed under subdivision
74:03:02:32(2).
Nitrates may not exceed 50 mg/L (as N) with a
variation allowed under subdivision 74:03:02:32(2).
Tennessee
42
Not specified
Texas
43
Nutrient Parameters. Generally applicable criteria
for nitrogen, phosphorus, carbon, and trace elements
cannot be established because sufficient information
on nutrient cycling in Texas waters and cause-effect
relationships between nutrient concentrations and
water quality is not presently available.
Site-specific nutrient criteria and/or permit
limitation, where appropriate, will be established as
information becomes available and after public
participation and proper hearing. Nutrients form
permitted discharges or other controllable sources
shall not cause excessive growth of aquatic vegetation
which impairs an existing of designated use.
Utah44
Domestic Water
Class 1C
Aquatic Wildlife
Class 3A and 3B
Class 3C and 3D
N03 as N - 10 mg/L
NH3 as N (un-ionized) - 4 day average and 1 hour
average as national criteria.
1 hour average as warm water national criterion.
-30-
-------
State and Vater Use
Criteria Values
Vermont
All
45
Not specified
Nutrients - No increase vhich would accelerate
eutrophication or result in concentrations that may
stimulate the growth of aquatic plants, fungi or
bacteria, in a manner which has an undue adverse
effect on any beneficial values or uses.
Virginia46
Public Vater Supply
Nitrate as N - 10.0 mg/L
Washington
47
Not specified
Vest Virginia
A, Bl, & B3
48
Category A
Bl & B3
Trout Waters (B2)
The concentration of un-ionized ammonia (NH,) shall
not exceed 0.05 mg/L. Un-ionized ammonia shall be
determined from values of total ammonia-N, pH and
temperature according to the following equation:
NH3
1.2 (total ammonia-N/[1+10(pKa~pH)]
where:
pKa = 0.0902 + 2730/(273.2 + T)
T * temperature in °C
Nitrate (as N) - 10 mg/L
Nitrite (as N) - 1.0 mg/L
Un-ionized Ammonia - 0.02 mg/L
Nitrite (as N) - 0.06 mg/L
49
Wisconsin
Intermediate Aquatic
Life
NH--N - not to exceed weekly average of 3 mg/L
from May through October and 6 mg/L from November
through April.
Wyoming
Class I, II and III
In all Class I, II and III waters vhich are designated
as cold water fisheries, the concentration of
un-ionized ammonia (as N) shall not exceed 0.02 mg/L.
-31-
-------
State and Water Use
Criteria Values
American Samoa
All
51
Total Nitrogen
Median not to exceed 0.30 mg/L
Not to exceed 0.65 mg/L IQ% of the time
Not to exceed 1.0 mg.l 2% of the time
Criteria values for specific water bodies can be found
in Vater Quality Standards for American Samoa.
52
District of Columbia Not specified
Guam53
M-l
M-2, S-l
M-3, S-2, S-3
N. Mariana Islands
AA
A, 1
2
AA, A, 1, 2
55
54
Nitrate-nitrogen (NO,-N) shall not exceed:
0.10 mg/L
0.20 mg/L
0.50 mg/L
Total nitrogen shall not exceed:
0.4 mg/L
0.75 mg/L
1.50 mg/L
Ammonia (un-ionized) shall not exceed 0.02 mg/L
Puerto Rico"
SD (Surface Waters) Nitrate as N - 10 mg/L
SB, SC (Coastal Waters) Nitrogen (N03, N02, NH-j) - 5 mg/L
Trust Territory
AA, A
B
1
2
56
Virgin Islands
57
Total Nitrogen as N shall not exceed:
0.400 mg/L
0.800 mg/L
0.750 mg/L
1.500 mg/L
Not specified
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