Un tt\i	December 1979
"Ml Pf«>i..flit>n	F'.cinnnv.] ,1111! Standard	AP%«AJ
A.		Wi.sMin.no. DC ^0160	O10R79105
W.ili-i

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United States	Office of Water	December 1979
Environmental Protection	Planning and Standard
Agencv	Washington DC 20460
Water
cvEPA Acidity-Alkalinity (pH)
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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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 QuaVi_ty_Criter^	(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.
This digest deals with pH and its use in State water quality
criteria. The pH is an indication of the degree of hydrogen ion
concentration and hydrogen ion activity. In natural conditions, pH
is determined by weak and strong acids and bases, and their salts.
Toxicologically, pH can have certain adverse effects on the
physiology and development on many aquatic life forms. It can also
effect the degree of toxicity of many chemicals by altering their
solubility and association with the hydrogen ions or other elements
in water. The 1976 Quality Criteria for Water recommends a criteria
range of pH which will provide protection from adverse effects for
specific water uses.
Range
5-9 Domestic water supplies (welfare).
6.5-9.0 Freshwater aquatic life.
6.5-8.5 Marine aquatic life.
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.
I

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Individual State-adopted criteria follow:
KEY
PWS
Rec.
F&WL
I nd.
Agric.
Mg/1
SAR
(For explanation of
General Stream Use
Publ ic Water Supply
Recreation
Fish and Wil dl ife
Industri al
Agricul tural
Milligrams per Liter
Sodium Absorption Ratio
use classifications, see FPA publication,
Desi gnat ions.)
II

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Acidity-Alkalinity (pH) Criteria
Alabama
PWS
Swimming
F&WL
Agr. & Ind,
Ind. Oper.
Navigation
Swimming
F&WL
Agr. & Ind,
Ind. Oper.
Navigat ion
ShelIf ish
Sewage, industrial waste or other
wastes shall not cause the pH to
deviate more than one unit from the
normal or natural pH nor be less
than 6.0 nor greater than 8.5.
For estuarine and salt waters to
which this classification is
assigned, wastes as described
herein shall not cause the pH to
deviate more than one unit from the
normal or natural pH nor be less
than 6.5 or greater than 8.5.
. . . not . . . deviate more than
one unit from normal or natural pH
nor be less than 6.5 nor greater
than 8.5.
Note: In the State of Alabama, there are two
separate classifications:
1.	Agricultural & Industrial Water Supply
2.	Industrial Operations
Alaska
American Samoa
Arizona
PWS
6.5 - 8.5

Swimming
6.5 - 8.5

F&WL
6.5 - 8.5
Saltwater

6.5 - 9.0
Freshwater
ShelIf ish
6.0 - 8.5

Agriculture
5.0 - 9.0
Fresh
I ndustrial
5.0 - 9.0
Marine
The pH range
shall be 7.0
to 8.3, and be within
0.1 pH units
of that which
would occur naturally

6.5 - 8.6
(no change greater


than 0.5 units)
Arkansas
6.0 - 9.0
Fluctuation not more
than 1.0 pH unit.

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(1A) Klamath River Basin
The pH shall not be depressed below 6.5 nor
raised above 8.5.
Changes in normal ambient pH levels shall not
exceed 0.2 units in waters with designated marine
(MAR) or saline (SAL) beneficial uses nor 0.5
units within the range specified above in fresh
waters with designated COLD or WARM beneficial
uses.
(IB) North Coastal Basin
(Same as 1A)
(2)	San Francisco Bay Basin
(Same as 1A)
(3)	Central Coastal Basin
Objectives for Inland Surface Waters, Enclosed
Bays and Estuaries
The pH shall neither be depressed below 6.5
nor raised above 8.3 in waters with designated
REC-1, REC-2, AGR, or MUN beneficial uses.
For waters with designated aquatic habitat
protection, including WARM, COLD, MAR, and BIOL,
and for waters not otherwise mentioned, the pH
shall not be depressed below 7.0 or raised
above 8.5.
Changes in normal ambient pH levels shall not
exceed 0.2 in waters with designated MAR
beneficial uses, nor 0.5 in fresh waters with
designated COLD or WARM beneficial uses.
(4A) Santa Clara River Basin
(Same as 1A)
(4B) Los Angeles River Basin
Objectives for Inland Surface Waters, Enclosed
Bays and Estuaries
(Same as 1A)

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(5A,B,C) Sacramento-San Joaquin Delta
The following water quality objectives
apply to all inland surface waters (excluding
the Delta) of the basins, and objectives that
apply only to specific surface water bodies.
The pH shall not be depressed below 6.5 nor
raised above 8.5. Changes in normal ambient
pH levels shall not exceed 0.5 in fresh waters
with designated COLD or WARM beneficial uses.
The following objective
applies to the water body
specified:	Applicable Water Body
pH shall be less than 9.5
and greater than 7.5 at
all times.	Goose Lake
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 pH shall not be depressed below 6.5 nor
raised above 8.5. Changes in normal ambient
pH levels shall not exceed 0.5 in fresh waters
with designated COLD or WARM beneficial uses.
The following objective
applies to the water body
specified:	Applicable Water Body
pH shall be less than 9.5
and greater than 7.5 at
all times.	Goose Lake
(5D) Tulare Lake Basin
The pH shall not be depressed below 6.5 nor
raised above 8.3 nor changed at any time more
than 0.3 from normal ambient pH levels.
(6A) North Lahontan Basin
The pH shall not be depressed below 6.5 nor
raised above 8.5, except in Eagle Lake where
the pH shall not be depressed below 8.0 nor
3

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raised above 9.5 and in Lake Tahoe where the
pH shall not be depressed below 7.0 nor
raised above 8.4.
Changes in normal ambient pH levels shall not
exceed 0.5 units in fresh waters with designated
COLD or WARM beneficial uses.
(6B) South Lahontan Basin
The pH shall not be depressed below 6.5 nor
raised above 8.5.
Changes in normal ambient pH levels shall not
exceed 0.5 units in fresh waters with designated
COLD or WARM beneficial uses.
(7A) West Colorado River Basin
Changes in normal ambient pH levels attributable
to controllable water quality factors shall not
exceed 0.5 units; and shall not depress the
receiving water pH below 6.5 units nor raise it
above 8.5 units.
(7B) East Colorado River Basin
Changes in normal ambient pH levels attributable
to controllable water quality factors shall not
exceed 0.5 units; and shall not depress the
receiving water pH below 6.5 units nor raise it
above 8.5 units.
(8) Santa Ana River Basin
(1)	All bay and estuary waters:
As a result of controllable water quality
factors, the pH shall not be depressed
below 7.0 units nor raised above 8.6
units.
Changes in normal ambient pH levels shall
not exceed 0.2 units.
(2)	All inland surface waters:
(a) The pH of all water except Baldwin
Lake shall not be depressed below 6.5 units
nor raised above 8.5 units as a result
4

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of controllable water quality factors.
(b)	The pH of Baldwin Lake shall not be
depressed below 6.5 units nor raised above
8.9 units as a result of controllable
water quality factors.
(c)	Changes in normal ambient pH levels
shall not exceed 0.5 units in any inland
surface water.
(9) San Diego Basin
Changes in normal ambient pH levels shall not
exceed 0.2 units in waters with designated marine
(MAR) or saline (SAL) beneficial uses nor 0.5
units in fresh waters with designated COLD or
WARM beneficial uses.
In bays and estuaries the pH shall not be
depressed below 7.0 nor raised above 8.5.
In inland surface waters the pH shall not be
depressed below 6.5 nor raised above 8.5.
Ocean Plan
The pH shall not be changed at any time more
than 0.2 units from that which occurs naturally,
Colorado
Recreational:
Class 1; Primary Contact
6.5 - 9.0 units
Aquatic Life:
Class 1; Cold Water Biota	6.5 - 9.0 units
Class 1; Warm Water Biota	6.5 - 9.0 units
Domestic Water Supply:
Class 1;
Class 2;
5.0
5.0
9.0 units
9.0 units
Connecticut
Freshwater
Class AA
Class A
Class B
Class C
as naturally occurs
as naturally occurs
6.5 - 8.0
6.0 - 8.5
5

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Marine Water
Class SA
Class SB
Class SC
6.8 - 8.5
6.8 - 8.5
6.5 - 8.5
Delaware	Shall be between 6.5 - 8.5
Total Alkalinity Not less than 20 mg CaC03/l at
any time.
Total Acidity	Not exceed alkalinity by
20 mg CaC03/l at any time.
District of Columbia 6.0 - 8.5.
Florida
PWS
Shellfish
Recreation/
F&WL
Agriculture
Navigation
Shall not vary more than 1.0 unit,
6.0 - 8.5.
Shall not vary more than 1.0 unit
(coastal), .2 (fresh), 6.5 - 8.5.
Shall not vary more than 1.0 unit
(coastal), .2 (fresh)
Marine: 6.5 - 8.5
Fresh: 6.0-8.5.
Shall not vary more than 1.0 unit,
6.0 - 8.5.
5.0 - 9.5; except for certain swamp
areas,
4.5 - 9.5.
Georgia	6.0 - 8.5.
Guam	Variations of more than 0.2 pH units from
natural conditions but not lower than 7.0
nor higher than 8.5 from other than natural
causes shall not be allowed.
Hawaii	pH Units
*Class AA	Not more than 1/2 unit
differrence from natural
conditions but not lower
than 8.0 nor higher than
8.5 from other than
natural causes (not lower
6

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than 7.0 for fresh tidal
waters).
Classes A,B Not more than 1/2 unit
difference from natural
conditions but not lower
than 7.0 nor higher than
8.5 from other than
natural causes.
Class B-2	Not less than 6.5 nor
higher than 8.5.
*For explanation of use classifications, see
EPA publication, "General Stream Use
Designations."
Idaho	Bear River, Bear Lake, Cub River, 7.0 - 8.5*
Worm Creek & Malad River.
Main stem of Snake River, Palouse 7.0 - 9.0*
River, North Fork Teton River,
Henry's River (Falls River to Snake
River), Raft River, Goose Creek, Salmon
Falls Creek, Jarbridge & Bruneau Rivers.
Kootenai, Clark Fork, Moyie, Coeur 6.5 - 8.0*
D'Alene, Priest & Spokane Rivers and
Pend Oreille River, Pend Oreille Lake,
Priest Lake & Coeur D'Alene Lake.
~Variation not more than 0.5.
Illinois	General Standards
pH (STORET number -	00400)	shall be within the
range of 6.5 to 9.0	except	for natural causes.
Lake Michigan
pH (STORET number -	00400)	shall be within the
range of 7.0 to 9.0	except	for natural causes.
Secondary Contact and Indigenous Aquatic Life
pH (STORET number -	00400)	shall be within the
range of 6.0 to 9.0	except	for natural causes.
Indiana	SPC 1R-4, General Standards
Aquatic Life
(pH) No pH values below 6.0 nor above 9.0,
except daily fluctuations which exceed pH
9.0 and are correlated with photosynthetic
activity, shall be permitted.
SPC 4R-2, Lake Michigan and Contiguous Harbor Areas
(pH) No pH values below 7.5 nor above 8.5,
7

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except daily fluctuations which exceed pH
8.5 and are correlated with photosyntheti
activity, may be tolerated.
SPC 7R-3, Grand Calumet River and
Indiana Harbor Ship Canal
(pH) No pH values below 6.0 nor above 9.0
except daily fluctuations which exceed pH
9.0 and are correlated with photosyntheti
activity, shall be permitted.
SPC 10R-2. Wolf Lake
(pH) No pH values below 6.5 nor above 8.5
except daily fluctuations which exceed pH
8.5 and are correlated with photosyntheti
activity, may be tolerated.
SPC 12R, Salmonid Fishes
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
Bridge. 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 (Black Ditch) from
Beverly Drive downstream to Lake
Michigan.
4.	Salt Creek above its confluence with the
Little Calumet River.
pH: No values below 6.0 or above 8.5, except
daily fluctuations which exceed pH 8.5
and are correlated with photosynthetic
activity, may be tolerated. However,
any drop below 6.0 or sudden rise above
8.5 not related to photosynthesis
indicates abnormal conditions.
8

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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 exist", 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.
pH: No values below 6.0 or above 3.5, except
daily fluctuations which exceed pH 8.5
and are correlated with photosynthetic
activity, may be tolerated. However,
any drop below 6.0 or sudden rise above
8.5 not related to photosynthesis
indicates abnormal conditions.
Iowa
6.5 - 9.0 with a maximum change of 0.5 units
as a result of a waste discharge
Kansas
6.5 - 8.5
Arkansas River - 6.5 - 9.0
Kentucky
Ind.
Aquatic Life
5.0 - 9.0
6.0 - 9.0
Louisiana
By Segment
6.0 - 8.5
or
6.5 - 9.0
Maine
Class A
Class B-l
Class B-2
Class C
None which would be in a range
that would be harmful to humans
or aquatic life
6.0 - 8.5
6.0 - 8.5
6.0 - 8.5
9

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Class D	No range that would impair uses
GP-B (Great Pond-B) 5.5 - 8.5
Class SA
Class SBj
Class SBe
Class SC
Class SD
6.7 - 8.5
6.7 - 8.5
6.7 - 8.5
6.7 - 8.5
No range that would impair uses
Maryland
Massachusetts
6.5 - 8.5.
Class A
Class B
Class C
Class SA
Class SB
Class SC
as naturally occurs
6.5 - 8.0; not more than 0.2 units
outside naturally occurring range
6.5 - 8.5/ not more than 0.2 units
outside naturally occurring range
6.5 - 8.5; not more than 0.2 units
outside naturally occurring range
Same as SA
Same as SA
Michigan	R 323.1053. Hydrogen ion concentration.
Rule 1053. The hydrogen ion concentration
expressed as pH shall be maintained within
the range of 6.5 to 8.8 in all waters of the
State except as otherwise prescribed by Rule
1080. Any artificially induced variation in
the natural pH shall remain within this range
and shall not exceed 0.5 units of pH.
R 323.1080. Special conditions
Rule 1080. To be consistent with the
agreement between the United States of
America and Canada on Great Lakes water
quality effective April 15, 1972, the
following conditions shall apply to the
Michigan waters of the Great Lakes and their
connecting waterways:
(a) Values of pH shall not be outside the range
of 6.7 to 8.5.
10

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Minnesota	Fisheries and Recreation
Class
A
PH
6.5 - 8.5
Class
B
pH
6.5 - 9.0
Class
C
PH
6.5 - 9.0
Industrial Consumption
Class
A
PH
6.5 -
8.5
Class
B
PH
6.0 -
9.0
Class
C
pH
6.0 -
9.0
Agriculture and Wildlife
Class A	pH 6.0-8.5
Class B	pH 6.0-9.0
Navigation and Waste Disposal
pH 6.0-9.0
PWS
6.0 -
8.5
±1. 0
Recreation
6.0 -
8.5
±1.0
F&WL
6.0 -
8.5
±1.0
Agriculture
6.0 -
8.5
±1. 0
Industrial
6.0 -
8.5
±1. 0
ShelIf ish
6.5 -
8.5
±1. 0
Navigation
5.0 -
9.5
1.5
Missouri	6.5 - 9.0.
Montana	A-Open-D, Classification: 6.5 - 8.5, variation
less than 0.5 pH unit
B-D, Classification: 6.5 - 8.5, variation
<0.5 pH unit
B-D2 Classification: 6.5 - 9.0, variation
<0.5 pH unit
B-D3 Classification: 6.5 - 9.0, variation
<0.5 pH unit
In all cases: Natural pH above 7.0 shall be main-
tained above 7.0.
Nebraska	6.5 - 8.5 with a maximum change of 0.5 unit.
Nevada	6.5 - 8.5 as a single value. Annual median range
differs for each basin.
11

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New Hampshire	Class A as naturally occurs
Class B 6.5 - 8.0
Class C 6.0-8.5
New Jersey	Class FW-1, CW-1, CW-2 - Natural Conditions
FW-2, FW-3, TW-1, TW-2, TW-3 - 6.5 - B.5
New Jersey - Delaware River
Zone 1 (non-tidal) - 6.0 - 8.5
Total alkalinity not less than 20 below
Mile 183.66 (Lehigh River)
Zone 2 (tidal-PWS) - 6.5 - 8.5
Total alkalinity between 20 and 100 mg/1
as CaC03
Zones 3, 4, 5 & 6- 6.5-8.5
Total alkalinity between 20 and 120 mg/1
as CaC03
New Jersey - Central Pine Barrens (Naturally soft and acid)
Class FW-Central Pine Barrens - 3.5 - 5.5
Total alkalinity not to exceed 10 mg/1
as CaCOj
Class Lower Mullica and Wading Rivers -
4.5 - 6.0
New Mexico	By Segment	6.6 - 8.8, 6 - 9, 6.6 - 9.0, or
6.6 - 8.6.
New York	Class N - Natural conditions
AA, A, B, C - 6.5 -8.5
D	- 6.0 - 9.5
SA, SB, SC, SD, I - normal range shall not
be extended by more
than one-tenth (0.1)
pH unit
A - Special (Great Lakes) - 6.7 - 8.5
AA - Special - Natural conditions
North Carolina	Shall be normal for the waters in the area,
which generally shall range between 6.0 - 8.5
except that swamp waters may have a low of 4.3.
Shellfish (Class SA)	6.8 - 8.5.
12

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North Dakota	Class I Streams:	pH of 7.0 - 8.5
Class IA Streams:	Same as above
Class II Streams:	Same as Class I
Class III Streams:	Same as Class II
Ohio	Warmwater Habitat - pH 6.5 to 9.0.
Exceptional Warmwater Habitat and Coldwater
Habitat - pH 6.5 to 9.0 with no change within
that range attributable to man-induced
conditions.
Seasonal Warmwater Habitat - pH 6.5 to 9.0
(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).
Lake Erie Outside Excepted Areas - pH 6.5 to
9.0 with no change within that range
attributable to man-induced conditions.
Lake Erie Within Excepted Areas - pH 6.5 to
9.0.
Ohio River - No pH value below 6.0 nor above
9.0; high pH values due to photosynthetic
activity may be tolerated. (Not approved by
USEPA).
Mahoning River Basin -
For Aquatic Life (Warmwater Fishery)
pH a) No value below 6.0 nor above 8.5
b) Daily fluctuations which exceed
the range of pH 6.0 to 8.5 and
are correlated with photosyn-
thetic activity may be tolerated.
For Public Water Supply
pH to be within the range
for PWSo 6.0 - 9.5
for PWS1 5.0 - 10.0
For Industrial Water Supply
pH not less than 6.0 nor greater
than 8.5.
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Lower Cuyahoga River - pH shall not be less
than 6.0 and shall not be more than 9.0 at
any time except that it may be less than 6.0
or more than 9.0 if there is no contribution
of acidic or alkaline pollution attributable
to human activities.
Oklahoma
6.5 - 8.5.
Oregon
6r5-8.5 All waters except Klamath River
(7.0 - 9.0)
Main stem of Columbia River (7.0 - 8.5)
Snake River (7.0 - 9.0)
Marine and Estuarine Waters (7.0 - 8.5)
Pennsylvania
Depending on stream use.	6.0 - 8.5
(See Pennsylvania Federal-State 6.5 - 8.5
standards)	7.0 - 9.0
Puerto Rico	Class SA - 7.3 - 8.5
SB, SC (Marine) - 7.3 - 8.5. Normal range
not to be extended by more than 0.1 pH unit.
SD (PWS) - 6.0 - 9.0
Rhode Island	Class A	as naturally occurs
Class B	6.5-8.0
Class	C	6.0-8.5
Class	D	6.0-9.0
Class SA
Class SB
Class SC
6.8 - 8.5
6.8 - 8.5
6.5 - 8.5
South Carolina	Fresh Water
A - 6.0-8.0 except for swamp waters (5.0 - 8.0)
B - 6.0-8.5 except for swamp waters (5.0 - 8.5)
Salt Water
SAA - Not outside of normally occurring values
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(SA) Shellfish
Shall not vary more than
3/10 of pH unit above or
below that of effluent -
free waters in the same
geographical area having a
similar total salinity, alka-
linity, and temperature.
(SB) Bathing
Same as above except variance
limited to 1/2 a pH unit; but
between 6.75 and 8.5.
(SC) Fishing
Same as SB - variance 1 pH unit
South Dakota
1)	Domestic water supply
2)	Cold water permanent fish
3)	Cold water marginal fish
4)	Warm water permanent fish
5)	Warm water semipermanent fish
6)	Warm water marginal fish
7)	Immersion recreation waters
8)	Limited contact recreation
9)	Wildlife propagation and
stock
10)	Irrigation waters
11)	Commerce and Industry
>6.
>6
>6,
>6,
>6,
>6,
>6,
>6
jdH.
and
and
and
and
and
and
and
and
<9
<8
<9
<9
<9
<8
<9
<9
0
6
0
0
0
3
0
5
units
Not Available
>6.0 and <9.5
Tennessee	Fish and Aquatic Life - 6.5 - 8.5
Other classes (except navigation) = 6.0 - 9.0
(pH) (all classes) . . . and shall not fluctuate more
than 1.0 unit in this range over a period of 24 hours.
Texas	By Segment	6.5 - 8.5
6.0 - 9.0
Trust Territories	pH shall be within 0.1 pH units of that
natural to the water (PWS).
The pH range shall be 7.0 to 8.3 (REC).
pH shall be within 0.1 pH unit of the
natural value (FWL).
pH shall not be less than 7.0 nor more
than 8.5 nor shall the influence of these
15

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waters, where they connect with waters
of other uses, cause a change in the
natural pH of more than 0.1 pH unit (NAV).
Utah
Domestic Source (1A, IB, 1C)
Recreation & Aesthetics (2A, 2B)
Aquatic Wildlife (3A, 3B, 3C, 3D)
Agriculture (4)
6.5
6.5
6.5
6.5
9.0
9.0
9.0
9.0
Vermont
Class A as naturally occurs
Class B 6.5-8.0
Class C 6.0-8.5
Virginia
Virgin Islands
All areas
6.0 - 8.5
Class A - Natural conditions
Class B - 7.0 - 8.3. Normal range not to be
extended by more than 0.1 pH unit
Class C - Same as Class B except 6.7 - 8.5.
Washington
Fresh
Marine
6.5 - 8.5
7.0 - 8.5
West Virginia
Generally, not less than 6.0 or greater than
8.5, or pH values normal for waters in the
area of question.
North Branch of Potamac
South Branch of Potomac
Potomac River
All trout streams
6
6
6
6
8.5
8.5
8.5
8.5
Wisconsin
Standards for Fish and Aquatic Life
The pH shall be within the range of 6.0 to 9.0,
with no change greater than 0.5 units outside
the estimated natural seasonal maximum and minimum.
Intermediate Aquatic Life
The pH shall be within the range 6.0 to 9.0.
Marginal Surface Waters
The pH shall be within the range 6.0 to 9.0.
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Wyoming	For all Wyoming surface waters, wastes attributable
to or influenced by the activities of man shall not
be present in amounts which will cause the pH to be
less than 6.5 or greater than 9.0 standard units.
North Platte
River
Stretch
I
- 6.5 -
8.5
North Platte
River
Stretch
II
- 7.0 -
8.0
North Platte
River
Stretch
III
- 7.5 -
8.5
Tongue River



7.0 -
8.5
Wind Bighorn
River


7.0 -
8.5
Green River



6.5 -
8.5
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