IEPA
United Stales
Environmental Protection
Agency
Office of Water EPA-823-F-99-020
4305 October 1999
Introduction to
Water Quality
Standards
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OVERVIEW
In response to widespread public concern about the condition of our Nation's
waters the United States Congress enacted landmark legislation in 1972.
This statute, the Federal Water Pollution Control Act Amendments of 1972
[referred to as the Clean Water Act of 1972 (CWA)] expanded and built
upon existing laws designed to control and prevent water Pollution.
Successive amendments to the 1972 CWA (the Clean Water Act of 1911 and
the Water Quality Act 0/1987) have continued to strengthen the law to
better protect our Nation's waters.
Water quality standards are the cornerstone of a State's water quality
management program. States and Indian Tribes set water quality standards
for waters within their jurisdictions. Water quality, standards define a use
for a waterbody and describe the specific water quality criteria to achieve
that use. The water quality standards also contain antidegradationpolicies
to protect existing water quality. These are the goals by which success is
ultimately gauged for a given waterbody or watershed.
This publication provides general information about the water quality
standards program. It is intended to serve as an introductory document for
the general public and for those unfamiliar with the water quality standards
program. This document also informs the reader about where to obtain
additional information about water quality standards. The document also
contains a Glossary of terms used in this publication as Appendix A. It also
contains terms and concepts commonly associated with water
quality standards. Terms found in the Glossary, are printed in boldface
italic type at their first use, as above.
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TABLE OF CONTENTS page
Overview
I Introduction I
II Uses of a Waterbody 5
III Water Quality Criteria 9
IV Antidegradation Policy 15
V Water Quality Standards
on Indian Lands 19
VI Adoption of Water Quality
Standards 23
VII For More Information 29
Appendix A Glossary 32
Appendix B List of307(a) Priority
Toxic Pollutants 3 7
Attachment Reader Response Card 39
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Section 1: Introduction
Part A: Definition and Purpose of Water Quality Standards
Water quality standards are laws or regulations that States and Indian Tribes
authorized to administer the program adopt to enhance water quality and to
protect public health and welfare. Water quality standards provide the
foundation for accomplishing two of the principal goals of the Federal Water
Pollution Control Act Amendments of 1972 [commonly referred to as the
Clean Water Act (CWA) of 1971-1. That is to:
• restore and maintain the chemical, physical, and biological integrity
of the Nation's waters; and
• where attainable, to achieve water quality that promotes protection
and propagation offish, shellfish, and wildlife, and provides for
recreation in and on the water. This goal is commonly known by the
expression "fishable/swimmable".
States report to the U.S. Environmental Agency (EPA) and
Congress under a specific part of the CWA, known as Section
305(b), on whether these goals are being achieved. (Under Section
305(b), States report to EPA once every two years on the condition of their
waters. EPA compiles the data and submits a report to Congress on the status
and condition of the Nation's waters.)
A water quality standard consists of three elements: (1) the designated
beneficial use or uses of a waterbody or segment of a waterbody: (2) the
water quality criteria necessary to protect the use or uses of that particular
waterbody; and (3) an antidegradation policy. (Each of these elements is
discussed in this publication.) Examples of designated uses are recreation and
protection of aquatic life. Water quality criteria describe the quality of water
that will support a designated use. Water quality criteria may be expressed as
either numeric limits or a narrative statement. An
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antidegradation policy ensures that water quality improvements are
conserved, maintained, and protected.
Water quality standards apply to surface waters of the United States, including
wetlands. Surface waters include rivers, streams, lakes, oceans, estauries, and
wetlands; they do not include ground water.
Part B: Statutory Authority for the Water Quality Standards
Program
The water quality standards program is authorized under Section 303(c) of
the CWA (33 U.S.C. 1313(c)). The current regulations implementing this
section of the CWA were published initially in the Federal Register (FR)
on November 8, 1983 (48 FR 51400). The specific language of the
regulations can be found in the Code of Federal Regulations (CFR) in
Chapter 40, Part 131.
(The Federal Register is a periodical published by the U.S. Government. It
includes all proposed and final regulations issued by EPA and other federal
agencies. The number preceding the letters "FR" in the citation refers to the
volume of the Federal Register, and the numbers after FR indicate the page
number. The Code of Federal Regulations contains all EPA and other
regulations that have received final approval. This document is abbreviated as
CFR. The numbers in CFR citations refer to chapters and parts: each chapter
customarily includes all the regulations in a given policy area such as water
quality standards, while each part within a chapter is a specific subject within
that policy area.)
The water quality standards program was strengthened in two significant
ways with passage of the 1987 Water Quality Act amendments to the CWA.
First, Section 303(c)(2)(B) of the CWA requires States to adopt numeric
criteria for specific toxic pollutants that appear on a. priority pollutant list
[Section 307(a) of the CWA]. (Priority pollutants are compounds and
families that are among the most persistent, prevalent, and toxic chemicals. A
list of priority
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pollutants appears as Appendix B.) These toxic substances are those for
which EPA published Section 304(a) criteria recommendations. These
toxics, if discharged to a waterbody or are present in sufficient
concentrations in a waterbody, could compromise or interfere with the
waterbody's designated use. On December 22, 1992, EPA imposed Federal
chemical-specific, numeric criteria for priority toxic pollutants on 14 States
that failed to adopt their own criteria, as required by Section 303(c)(2)(B)
of the CWA. This action brought all States into compliance.
Second, Section 518 of the 1987 CWA gives EPA the authority to approve
Indian Tribes to administer the water quality standards program on
Reservation Lands. Section 518 also required EPA to develop a
mechanism for resolving disputes when an Indian Tribe and a State adopt
different water quality standards on a common body of water. On
December 12, 1991, EPA issued Amendments to the Water Quality
Standards Regulation that Pertain to Standards on Indian Reservations (40
CFR 131.6 and 131.7). The Amendments establish qualification criteria
for Indian Tribe administration and describe a conflict resolution
mechanism.
Part C: Establishing Water Quality Standards
The 50 States, the District of Columbia, U.S. Territories (Commonwealth
of Puerto Rico, American Samoa, Palau, the Virgin Islands, Guam, and the
Commonwealth of the Northern Mariana Islands), and Indian Tribes
authorized to administer the program adopt water quality standards for each
waterbody within the State, territory, or tribal boundary. (Throughout this
document, the term State is used to mean any of the above jurisdictions.)
EPA may also establish water quality standards where a State fails to do so.
A single water quality standard need not be applied to the entire waterbody
(for example, for the entire length of a stream); different water quality
standards may be set on different segments of the same waterbody.
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EPA reviews new or revised water quality standards that States adopt to
determine whether the standards meet CWA requirements. EPA also reviews
the standards of each State to ensure that they do not interfere with
attainment of standards in waters shared with another State or waters located
in another State downstream. If EPA disapproves a State's water quality
standards, or determines that a new or revised water quality standard is
necessary to meet the requirements of the Act, EPA may issue water quality
standards to which the State is bound. EPA provides technical guidance,
program grants, and assistance to the States to help them carry out the
requirements of the program.
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Section II: Uses of a Waterbody
Part A: Designated Uses and Existing Uses
The water quality standards program categorizes water uses in two ways:
designated uses and existing uses. A designated use is the legally
applicable use specified in a water quality standard for a watershed,
waterbody, or segment of a waterbody. A designated use is a use that,
presently, may or may not be met or "attained". All pollution control
activities are designed to attain the designated uses. An existing use is the
use that has been achieved for a waterbody on or after November 28, 1975,
and that requires the most stringent criteria. (This is the date when the
original water quality standards regulation took effect.)
Understanding the distinction between existing and designated uses is
fundamental to understanding the standards program. An existing use for a
specific waterbody is one that has been attained; that use and the water
quality necessary to continue supporting that use must be protected and
maintained. Designated uses, on the other hand, may be changed upon
finding that the use cannot be attained, but only after conducting a Use
Attainability Analysis (UAA), described in Part C of this Section. Changing
a designated use also results in a change to the applicable water quality
criteria.
Part B: Typical Uses of a Waterbody
Typical uses of waterbodies include public water supply, propagation of
fish and wildlife, recreation, agriculture, industrial processes, and
navigation. EPA does not recognize waste transport as an acceptable use.
Designated or existing uses for wetlands may include providing habitat for
endangered species or mitigating the effects of floodwaters.
A special designated use category is Outstanding National Resource
Waters (ONRWs). These waters are high quality or ecologically unique
waters such as those within the jurisdiction of National and
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State Parks and wildlife refuges. ONRWs are waters that are
ecologically important, unique, or sensitive (such as swamps or hot
springs), which the commonly applied use classifications and
supporting criteria do not always serve to protect. No new or
additional discharges can occur in ONRWs. Some States have a
special use category called State Resource Waters, which may allow
limited changes in water quality as long as the changes do not affect
the characteristics that support the use designation.
Part C: Establishing Designated Uses
States are responsible for establishing designated uses of a waterbody.
Categories of designated uses vary by State. Each State develops its own use
classification system based on the generic uses cited in the CWA (see Section
1, Part A). States may designate uses such as cold water fisheries or
particular species to be protected, for example, trout or bass. States may also
designate special uses to protect sensitive or valuable aquatic life or habitat.
Figure I below illustrates an example of a use designation. In this case, the
waterbody depicted is a cold water stream, and the
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designated use is aquatic habitat. The stream system is appropriate for
sustaining the brook trout depicted in the figure because it has undercut
banks, a gravel stream bed, and overhanging vegetation.
Uses may be revised during periodic State reviews of the water quality
standards, which, by law, are required at least once every three years. The
public must have an opportunity to comment on changes in uses and EPA
must approve any changes.
When establishing a designated use that does not meet the "fishable/
swimmable" goal, States perform a use attainability analysis (UAA) to
determine the achievable uses of a waterbody. A UAA is a structured
scientific assessment of the physical, chemical, biological, and economic
factors that affect the attainment of a use. Consisting of a waterbody survey
and assessment and an economic analysis, if appropriate, the UAA enables
the States to answer the following questions about the conditions of its
waters:
What is the existing use to be protected?
To what extent does pollution (as opposed to physical
factors) contribute to impaired use?
What level of point source control is required to restore or
enhance the use? (The term "point source" refers to pollution
resulting from discharges into receiving waters from any
discernible confined and discrete conveyance such as a pipe,
ditch, or sewer.)
What level ofnonpoint source control is required to
restore or enhance the use? (The term "nonpoint source"
refers to pollution sources that are diffuse and do not have a
single point of origin. Run-off from agriculture, forestry,
and construction sites are examples.)
While UAAs are the responsibility of the States, the actual studies
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may be performed by other entities (e.g., consultants hired by the States or
Indian Tribes). States are encouraged to consult with EPA before the analysis
is initiated and frequently while it is being conducted. EPA's Regional Offices
can provide additional information about UAAs (Section VII of this
document contains a list of the Regional Offices and the States and Territories
covered by each region). A State may also elect, at its option, to conduct a
UAA even when designating fishable/swimmable uses, simply to document
the reasonableness of the designation and the attainability.
PartD: Changing Designated Uses
States may modify a designated use when its attainment is precluded because
of one or more of the following factors:
• naturally occurring pollutant concentrations;
natural, intermittent or low-flow water levels;
• anthropogenic conditions or sources of pollution that cannot be
corrected or for which corrective measures would cause more
deterioration of the environment than would leaving the conditions or
pollutants in place;
• dams, diversions, or other hydrologic modifications;
physical conditions associated with the natural features of the
waterbody, unrelated to quality, that impede protection of aquatic life;
or
• more stringent controls than those required by Sections 301(b)(l)(A)
and (B) and 306 of the CWA would result in substantial and
widespread economic and social impact.
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Section III: Water Quality Criteria
Part A: Definition of Water Quality Criteria
The phrase "water quality criteria" has two definitions under the CWA. First, under
Section 304(a), EPA publishes water quality criteria that reflect available scientific
information on the concentrations of specific chemicals in water that protect
aquatic life or human health. These criteria are intended to provide protection for
all surface waters on a national basis and may be used by the States as a basis for
developing enforceable water quality criteria as part of their standards. The general
public sometimes mistakenly views these criteria as the "standards." In a legal
sense, a water quality standard must also contain a designated use and an
antidegradation policy.
Second, water quality criteria are elements of water quality standards adopted by a
State under Section 303(c), which describe the quality of water that will support a
particular use. When properly selected criteria are met, they are expected to protect
the designated use. As a practical matter, most States for most pollutants adopt
EPA's Section 304(a) criteria recommendations as part of their legally enforceable
water quality standards.
Part B: Forms of Criteria
Water quality criteria are expressed in either numeric form or narrative form.
Numeric criteria are expressed as chemical concentrations or conditions
(such as pH or turbidity) in water which should protect designated uses.
Concentrations of chemicals or other pollutants are typically expressed as a
weight, measured per liter, such as ug/L (micrograms per liter) or mg/L
(milligrams per liter). Micrograms are much smaller than milligrams: one
milligram equals 1000 micrograms. An example of a numeric criterion is
dissolved oxygen >/= 5.0 mglL (stated in English, this narrative criterion
means that the amount of oxygen dissolved in the water should be equal to or
greater than 5 milligrams per liter).
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Section 303(c)(2)(B) of the CWA requires States to adopt numeric criteria
for priority toxic pollutants. The 126 individual priority toxics are listed in
Appendix B to this document.
Narrative criteria are expressed in concise statements, generally in a "free
from" format. EPA aesthetic narrative quality criteria, for example, state that
"all waters should be free from substances attributable to wastewater or other
discharges that: (1) settle to form objectional deposits; (2) float as debris,
scum, oil, or other matter to form nuisances; (3) produce objectionable color,
odor, taste, or turbidity; (4) injure, are toxic to, or produce adverse
physiological responses in humans, animals, or plants; and (5) produce
undesirable or nuisance aquatic life." Similarly, the phrase "free from toxic
pollutants in toxic amounts" is derived from the national goal statement in
Section 101(a)(3) of the CWA. An example of a narrative, biological
criterion is natural background conditions shall be maintained.
Part C: Site-specific Criteria
Site-specific criteria are either numeric or narrative criteria adopted for a
particular site that reflect environmental conditions at that site. The EPA
Section 304(a) guidance on water quality criteria, which are intended to
provide protection for all surface waters on a national basis, is broad. These
broad criteria can be tailored to reflect localized, site-specific conditions.
Site-specific criteria are sometimes justified because:
• species inhabiting a given site may be more sensitive or less
sensitive than those used by EPA to develop Section 304(a) criteria;
water chemistry (e.g., pH, hardness, temperature, suspended solids)
at the site may differ substantially from the water used in the
laboratory for developing Section 304(a) criteria, affecting toxicity
of the chemicals to the organisms in the water; or
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EPA may not have a criteria recommendation for a
pollutant adversely affecting the designated use at a
particular location.
Part D: Developing Water Quality Criteria
EPA publishes, as guidance, Section 304(a) criteria which reflect the most
current scientific information available regarding pollutant effects on human
health and aquatic life. The criteria, which have no force of law, are
published as guidance documents to assist the States and Indian Tribes in
setting water quality standards. Human health criteria provide guidelines
that specify the potential risk of adverse effects to humans due to substances
in water. Aquatic life criteria are designed to protect all aquatic life,
including plants and animals.
The criteria guidance documents issued by EPA contain two major types of
information:
1. scientific data on the effects of pollutants on human
health (including recreation) and aquatic life; and
2. quantitative concentrations or qualitative assessments
of pollutants in water that will generally ensure water
quality adequate to support a particular use.
The document, Quality Criteria for Water 1986, contains summaries of all
contaminants and conditions for which EPA has developed criteria
recommendations. The current edition is known as the "Gold Book." This
document may be obtained for a fee from the National Technical Information
Source (NTIS) or the Education Resource Information Center (ERIC)
(complete ordering information is contained in Section VII of this document).
EPA considers effective State water quality standards programs to include
both numeric approaches and narrative approaches. In the case of toxic
pollutants, for example, numeric criteria for specific
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chemicals are appropriate in circumstances where the cause of toxicity is known,
or when human health effects are associated with a specific concentration of the
toxic pollutant. A narrative standard may be suitable when a specific pollutant is
identified as impairing the quality of the waterbody (such as reducing fish
populations), but a numeric criterion is not specified in State standards.
Narrative standards can also be used when the chemical(s) causing the toxicity is
unknown. As a specific standards program matures and more definitive data
become available, narrative criteria can be replaced with numeric ones.
Anyone may propose a site-specific criterion to a State. A municipality or a
private company may conduct the work to support a site-specific criterion.
The State must review the data and the procedures used to collect and
analyze the data. The State must then make the determination whether to
adopt site-specific criteria. If adopted, the State must submit the site-specific
criteria to EPA for review and approval or disapproval. The State may use
methods that are less scientifically rigorous than EPA's, but the methods
must be defensible (as required by 40 CFR 13 1.11).
Guidance, developed by EPA, for deriving site-specific water quality criteria
starting with EPA's Section 304(a) criteria can be obtained form EPA's
Health and Ecological Criteria Division at the address listed in Section VII.
Guidelines for Deriving Numerical National Water Quality Criteria for the
Proctection of Aquatic Life, published in October 1984, is available from
NTIS (publication number PB85-227049). States are also urged to consult
with the appropriate EPA Regional Office (listed in Section VII) before
beginning to develop site-specific criteria.
Part E: Water Quality Criteria for Protection of Human Health
Water quality criteria have been established to protect human health from
most toxic pollutants ingested by consuming aquatic organisms (such as fish
containing mercury). The criteria are based on the assumption that humans
consume 6.5 grams of contaminated aquatic
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organisms daily and that the average body weight of a human is 70 kg or
about 150 pounds. These criteria use other standardized factors for each
pollutant, which are derived from laboratory studies. EPA is now revising
its human health criteria, which will encourage more State and local input
on risk management decisions.
EPA's water quality criteria for fish consumption are distinct from the limits
developed by the Food and Drug Administration (FDA) and serve a
different function. The EPA criteria for protecting human health are non-
regulatory, scientific recommendations for ambient levels in water, which if
not exceeded, will ensure that safe levels are maintained in edible aquatic
organisms. ("Ambient" refers to the existing conditions in the waterbody.)
The FDA action levels are regulatory numbers used to prohibit the sale of
edible aquatic life when contaminant concentrations in the edible portions of
the organisms exceed the FDA limit.
Part F. Water Quality Criteria for the Protection of Aquatic Life
The development of national numerical water quality criteria for the
protection of aquatic life is a complex process. After a decision is made that
a national criterion is needed for a particular material, all available
information concerning the impact of that material on aquatic life is
collected; this can include experimental and laboratory testing data. There
are two types of criteria which may be established: "acute," which cover
short-term exposures such as spills, and "chronic," which cover long-term
or permanent exposures. One or both of the acute and chronic criteria may
be related to other water quality characteristics, such as pH, temperature, or
hardness. Separate criteria are developed for fresh and salt waters.
Part G: Other Criteria-Preserving Biological Integrity
In addition to human health and aquatic life criteria, EPA is developing
biological and sediment criteria to further the CWA
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goal of protecting the chemical, physical, and biological integrity of the
Nation's waters. Biological criteria are narrative or numeric expressions
that describe the desired biological condition of aquatic communities
inhabiting particular types of waterbodies. Sediment criteria address the
toxicity of different sediment types in different environmental settings;
controlling sediment pollutant concentration helps prevent harmful
chemicals from accumulating in the tissues of animals in the food chain.
While each type of water quality criterion has a different protective focus,
human health, aquatic life, biological, and sediment criteria are
complementary. No single criterion value or number will guarantee
protection of all forms of life. Collectively, these four types of criteria
provide a valuable tool for protecting the physical, chemical, and
biological—and ultimately the ecological—integrity of the Nation's waters.
Figure 2 below shows how use designation and criteria can be
applied to different waterbodies (in this case a stream, lake, and
wetland) within a watershed.
Figure 2
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Section IV: Antidegradation Policy
Part A: Origin and Purpose of Antidegradation Policies
EPA's water quality standards regulation requires States and Indian Tribes
to adopt a policy that conserves, maintains, and protects existing uses and
the water quality necessary to protect these uses. This policy is known as
the antidegradation policy. Established by the Secretary of Interior in
February 1968 before the creation of EPA, the policy was incorporated into
the water quality standards regulation issued by EPA in November 1975.
The policy was clarified and included in the water quality standards
regulation published in the Federal Register on November 8, 1983 (48 FR
51400); the specific code is contained in 40 CFR 131.12. Section 303(d) of
CWA establishes Congressional recognition and approval of EPA's
antidegradation policy.
Part B: Federal Antidegradation Requirements
The water quality standards regulation requires States and Indian
Tribes to adopt an antidegradation policy that
maintains existing uses of a waterbody or segment and the level of
quality necessary to protect the use (known as Tier 1 waters);
protects high quality waters (unless certain conditions are met).
High quality water is that which exceeds levels necessary to
support propagation offish, shellfish, and wildlife as well as
recreation in and on the water (these waters are also known as
Tier 2 waters); and
provides special protection for Outstanding National Resource
Waters (ONRWs)(also known as Tier 3 waters).
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Many States designate Outstanding State Waters instead of ONRWs to
provide additional protection while allowing for limited discharges.
Part C: State Antidegradation Policies
States and Indian Tribes are required to adopt an antidegradation policy and
methods for their implementation. The policy need not be formally adopted
into the State's water quality standards, but it must be specifically referenced
in the standards regulation so that its relationship to the standards is clear.
EPA has the authority to review State and Tribal antidegradation policies
and to issue such policies if a State or Indian Tribe fails to adopt an
antidegradation policy that is consistent with the CWA. Implementation
plans may be disapproved by EPA if the plans contain provisions that may
result in violating the intent, spirit, and requirements of the antidegradation
policy.
Issuance of a National Pollution Discharge Elimination System (NPDES)
permit by the State or Indian Tribe serves as an example of how EPA may
disapprove the implementation of an antidegradation policy. (Section 402
of the CWA, the National Pollutant Discharge Elimination System, is the
EPA program that controls the discharge of pollution from point sources by
requiring that a person or organization discharging any type of waste into a
surface water obtain a NPDES permit from the EPA, and limit their
discharges to the limit contained within the permit. EPA has the legal
authority to delegate its permit granting role to the States and Indian tribes.)
If a State or Indian Tribe, for example, fails to apply its antidegradation
policy when it issues an NPDES permit, EPA may object to the permit as
not meeting the requirements of the Act. The State or Tribe may then be
barred from issuing the permit until steps are taken to comply with the
antidegradation policy. Citizens may also challenge any permit in State
court on the grounds that it does not comply with the State's or Indian
Tribes's antidegradation policy. Additionally, EPA may determine
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that the State's or Indian Tribe's antidegradation policy is, in fact,
inconsistent with EPA requirements (40 CFR Section 131.12). In this case,
EPA would issue an antidegradation policy for waters in the State or
Reservation Lands.
The antidegradation policy has been developed so that it minimizes adverse
effects on economic growth and development and at the same time protects
CWA goals. Federal regulations are not intended to result in standards that
are so stringent that compliance would cause severe economic impacts. The
antidegradation policy does not prohibit lowering of water quality. It does,
however, establish a public process for considering the relevant factors
before doing so.
Part D: Antidegradation Policy and Wetlands
States and Indian Tribes are expected to fully apply their antidegradation
policies to wetlands. Wetlands are defined in the CWA as those areas that
are inundated or saturated by surface or ground water at a frequency and
duration to support, and under normal circumstances do support, a
prevalence of vegetation typically adapted to life in saturated soil
conditions. Wetlands generally include marshes, swamps, bogs, and
similar areas.
The antidegradation policies should provide for the protection of existing
uses in wetlands and the level of water quality that is necessary to protect
those uses, similar to antidegradation policies in other waters. In the case of
using wetlands for disposing dredge and fill material (such as materials
that might result from development of highways and airports, or from
construction of dams and levees), EPA follows a slightly different
interpretation of existing uses. EPA recognizes that Congress intended for
some fill to occur in wetlands, as long as the discharged materials do not
result in significant degradation as defined in the section of the CWA that
concerns permits for dredge and fill materials [Section 404(b)(l) guidelines
in 40 CFR Part 230)]. These guidelines establish a process to ensure that
impacts to wetlands are avoided,
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minimized, and mitigated. States may, of course, adopt stricter
requirements for wetland fills in their antidegradation policies,
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Section V: Water Quality Standards on Indian Lands
Part A: Requirements for Water Quality Standards Programs on Indian
Lands
Before an Indian Tribe is granted authority to administer a water quality
standards program, the following criteria must be met:
• The Indian Tribe must be recognized by the Secretary of Interior.
• The Tribe must have a governing body with substantial duties and
powers within a defined area (including authority to conduct
governmental functions such as ensuring the health and welfare of
an affected population.).
• The water quality standards program must include managing and
protecting water resources within the borders of the Indian
Reservation.
The Indian Tribe must have the necessary management and technical
skills to implement an effective water quality standards program or
must submit a plan to acquire those skills.
The Tribal application to administer the program must be submitted to the
EPA Regional Administrator, who informs all neighboring governmental
entities that the application has been received. The Regional Administrator
allows 30 days for comments on the Tribe's application. (Locations of EPA
Regional Offices and the States covered by each are contained in Section
VII.) States and other Federal entities participating in the review cannot veto
the application. EPA independently evaluates the application and promptly
notifies the Tribe in writing whether it qualifies to administer the program.
No statutory requirement exists that requires an Indian Tribe to apply for the
water quality standards
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program, nor is there a deadline by which applications must be
submitted.
Part B: The Issue Dispute Resolution Mechanism
The December 12, 1991 Amendments to the Water Quality Standards
Regulation That Pertain to Standards on Indian Reservations (40 CFR 131.6
and 131.7) set forth procedures to resolve unreasonable consequences that
may arise when an Indian Tribe and State adopt different water quality
standards on a common body of water. EPA has established mechanisms for
resolving disputes between Indian Tribes and States, but prefers that Indian
Tribes and States resolve disputes without EPA involvement.
The "issue dispute resolution mechanism " is a way for EPA to resolve
issues that arise as a result of States and Indian Tribes setting different water
quality standards on common bodies of water. Dispute resolution actions
involving water quality standards must be consistent with one or more of the
following options:
a. Mediation. The EPA Regional Administrator may appoint a
mediator who can be an employee of EPA or some other Federal
agency, or another appropriately qualified individual. The
mediator, acting as a neutral facilitator, encourages communication
and negotiation among disputing parties, and may establish
advisory panels to study the problems and recommend a solution.
The advisory panel must consist of members from the affected
parties. The mediation procedure and schedule is determined by
the mediator in consultation with the parties to the dispute.
b. Arbitration. The EPA Regional Administrator may appoint an
arbitrator or arbitration panel (which disputing parties must
approve) to settle the dispute. Arbitrators and panel members may
be EPA employees, employees of other Federal agencies, or other
individuals with appropriate qualifications. Individuals serving in
this capacity who are Federal employees must act
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independently of their agencies. Arbitrators and panelists must
be versed in the water quality standards program and
understand the political and economic interests of the Indian
Tribes and States involved.
At least one private or public meeting must be held with the
parties. The arbitrator or panel must solicit information on
how fulfilling the requirements for obtaining a permit affect
entities that discharge into a water body, comparative risks to
public health and the environment, economic impacts, water
uses, water quality, and other factors relevant to the dispute.
After considering these factors, the arbitrator or panel
provides a written recommendation for resolving the dispute
to the affected parties and the EPA Regional Administrator.
Disputing parties need not accept the recommendation unless
they voluntarily entered into a binding agreement to do so. If
a party to the dispute believes that the arbitrator or panel has
recommended an action that is inconsistent with the CWA,
the party may appeal the recommendation to the Regional
Administrator in writing. The appeal must include the
statutory basis for altering the arbitrator's recommendation.
c. Dispute Resolution Default Procedure. A default procedure is
available when disputing parties refuse to participate in either
mediation or arbitration. In such an event, the EPA Regional
Administrator may appoint a single official or panel to review
information related to the dispute and issue a written
recommendation for its resolution. Recommendations issued
by EPA resulting from this default procedure have no force of
law.
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Part C: Options for Establishing Water Quality Standards
Indian Tribes have three options for establishing water quality
standards for waters under their jurisdiction:
They may negotiate a cooperative agreement with an adjoining
State to apply that State's water quality standards to the
Reservation Lands. A cooperative agreement can include any
provision agreed upon by the two parties; or
they may adopt the adjacent State's water quality
standards with or without modifications; or
they may develop and adopt their own standards to
account for unique Tribal uses and needs.
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Section VI: Adoption of Water Quality Standards
Part A: Processes For Establishing Water Quality Standards
The process for developing, reviewing, adopting, and implementing water
quality standards on land under the jurisdiction of States and Indian Tribes
is the same. The overall requirements are specified in the CWA and the
water quality standards regulation issued on November 8, 1983.
Each State and Tribe has its own legal and administrative procedures
for adopting water quality standards; there are no standardized
procedures. The CWA requires States and Indian Tribes to hold one
public hearing and to involve the public in reviewing and revising
water quality standards.
The governmental entity responsible for adopting State or Indian
Tribal water quality standards varies from State to State and Tribe to
Tribe. In some States, water quality standards are adopted by the State
legislative body and signed into law by the Governor. In others,
standards are adopted through an administrative agency rulemaking
procedure which may be subject to legislative oversight. For Indian
Tribes, the governing Tribal body or authority is responsible for
adopting water quality standards on Reservation Lands.
One approach to water quality protection considers the whole aquatic
system, including other resource management programs that address land,
air, and water to successfully manage problems for a given aquatic resource.
This approach—the watershed protection approach—encourages States and
Indian Tribes to work collectively to manage high priority water quality
concerns, to coordinate among various interests, and to devise solutions for
local conditions. States and Tribes define the goals in the watershed, or
waterbody, of concern and can adopt these in their water quality standards.
Goal selection is driven by stakeholder involvement in the process.
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Part B: Status of the Water Quality Standards Program
All 50 States, the District of Columbia, and the U.S. Territories have developed
water quality standards. Some Indian Tribes have been authorized to administer
the water quality standards program and have approved water quality standards.
The number of Tribes that may eventually assume responsibility for the program
is unknown.
Part C: Reviewing, Revising, and Adopting New Standards
Section 303(c) of the CWA requires States to hold public hearings at least
once every three years to review applicable water quality standards and, if
appropriate, to adopt new standards. In conjunction with EPA, States select
waterbodies for which water quality standards are to be reviewed in-depth.
Selection is based on the following sources of information:
a list of impaired waters, Section 304(1). This list comprises two
types of waters: first, those in which water quality standards
cannot be met because of the presence of toxic pollutants;
second, those in which the following uses cannot be maintained
or achieved. This category includes public water supplies,
agricultural and industrial uses, the protection and propagation
of a balanced population of shellfish, fish and wildlife, and
recreational activities in and on the water. The second category
also includes any waters that present a threat to public health.
reports on the condition of the waters within the boundaries of
each State (Section 305(b) Reports). These reports, required
biennially for each State, describe the water quality of all
navigable waters in the State, as well as the nature and sources
of pollution to the waters during the preceding two years.
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waters identified as not meeting water quality standards
(Section 303(d) Lists). This section requires States to list
those waters for which (1) the limitations on effluent
discharges (or releases of pollutants to a waterbody) are not
stringent enough to implement water quality standards for
the waters and (2) the limitations on thermal discharges
(effluent with elevated temperatures) are not stringent
enough to ensure protection and propagation of a balanced
indigenous (native) population of shellfish, fish, and
wildlife.
waterbody segments where majorNPDES permits are to be
issued; and
priorities within a watershed.
Additionally, waterbodies with water quality standards that do not meet the
requirements of the CWA (i.e., do not provide for the protection of aquatic
life or recreation) must be reexamined every three years. States must
review their standards to determine if new scientific and technical data may
be available which have a bearing on their standards. Further,
environmental changes and economic development over time may warrant
the need for a review. Where States have not adopted standards that
provide for the protection of aquatic life or recreation, the State must
periodically review standards to see if the "fishable/ swimmable" uses can
be attained. In addition, States may have adopted water quality standards
without sufficient data to determine whether the uses were attainable.
Finally, changes in the CWA or EPA's regulations may necessitate State
review of their standards to ensure continued compliance with Federal
requirements.
States may use several ways to determine the appropriateness of a water
quality standard. Generally, States will review intensive water quality
survey and monitoring data, and any other information for a waterbody, to
determine if uses are impaired or if water
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quality criteria are exceeded. If uses are impaired or criteria exceeded,
States will evaluate whether more stringent controls are needed to attain
the water quality standard or whether the water quality standards are
appropriate.
Part D: EPA's Role Following State or Tribal Adoption of
Standards
The Governor or Tribal Authority (or designee) submits the State's
or Tribe's officially adopted standards to the appropriate EPA
Regional Administrator for review. The Regional Administrator
reviews the standards to determine compliance with the CWA and
implementing regulations. The Regional Administrator may
approve or disapprove (in whole or in part) State or Tribal water
quality standards based on the review. If the standards do not meet
CWA requirements, the Regional Administrator must inform the
State or Tribe of the changes needed to bring the standards into
compliance. If the State or Tribe does not make the required
changes, EPA begins a process that results in the promulgation (i.e.,
the issuance of a legally binding standard) of a Federal water
quality standard for the affected waters. Meanwhile, the standards
adopted by the State or Tribe remain in effect until the
promulgation process is complete or the State adopts revised water
quality standards. These requirements are listed in 40 CFR 131.6.
In addition, EPA is required under the Endangered Species Act to
consult with the Fish & Wildlife Service (F&WS) and the National
Marine Fisheries Service (NMFS) to determine if adverse effects to
threatened or endangered species are likely. The F&WS is part of
the U.S. Department of Interior, and the NMFS is part of the
National Oceanic and Atmospheric Administration. The
Endangered Species Act (ESA) was enacted in 1973. The ESA and
subsequent amendments are intended to protect and preserve plants
and animals whose populations have been threatened or impaired by
the actions of humans.
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EPA may also issue Federal regulations when the Administrator determines
that a new or revised standard is necessary to meet the requirements of the
CWA. Federal water quality standards are withdrawn when States or Tribes
adopt standards that meet the statutory and regulatory requirements. At the
present time, Federal actions of this type remain in force in Arizona, the
Coleville Confederated Tribes Indian Reservation in Washington, the San
Francisco Bay/Delta, and in 14 jurisdictions in the National Toxics Rule.
When issuing water quality standards that are binding on a State or on Tribal
Lands, EPA must adhere to the same substantive requirements as the State or
Tribe for adopting standards. Additionally, EPA at a minimum must
publish the proposed water quality standard in the Federal Register,
solicit public comments on the proposed standard,
hold a public hearing
analyze and incorporate public comments, and
publish the final water quality standard.
Part E: Enforcing Water Quality Standards
Water quality standards are not directly Federally enforceable under the CWA,
but they provide a basis for establishing discharge limits in NPDES permits and
Section 404 permits (those permits that allow for the disposal of dredge and fill
material into surface waters). The permits are legally enforceable. Failure to
comply with NPDES or dredge-and-fill permit limits can result in enforcement
action. States, however, do have the option, under Section 510 of the CWA, to
make water quality standards directly enforceable.
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Part F: The Role of the Public in Setting Water Quality Standards
The public has a vested interest in our Nation's water quality. Open hearings on
water quality standards provide an opportunity for the public to become
involved in the water quality standards setting process. Citizens may make
recommendations on improvements or modifications in the standards during the
public hearing process. Public hearings are a powerful vehicle through which
citizens may make their concerns known to public officials. States and Indian
Tribes are required by law to hold hearings at least once every three years.
Part G: Available Guidance and Assistance
In addition to publishing Section 304(a) criteria guidance, EPA develops
other informational materials to help the States and Indian Tribes meet the
requirements of the water quality standards program. Such informational
materials include technical publications, newsletters, and videotapes.
Guidance materials are supplemented by training programs, technical
assistance, workshops, meetings, and other forums conducted by EPA
personnel. EPA personnel are also available for consultation. EPA
encourages a free exchange of information in the Federal-State effort to
clean-up and protect the Nation's waters. (Section VII of this document tells
you where additional information about water quality standards and criteria
can be obtained.)
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Section VII: For More Information
EPA's ten Regional Offices (listed on page 31) can provide detailed
information about the procedures by which an Indian Tribe may qualify for
water quality standards program authorization. EPA is also available to
provide technical information as Indian Tribes begin to develop water
quality
standards affecting Reservation Lands.
Information on the water quality standards of a given State may be
obtained from the State's Water Pollution Control Agency or its equivalent
or directly from an Indian Tribe. Information may also be obtained from
the Water Quality Standards Coordinator in each Regional Office
identified on page 31.
You may also contact EPA at the following address for more information
about water quality standards, including schedules for training programs
and technical assistance workshops, documents and videos.
Specific information about water quality standards may be obtained from
U.S. Environmental Protection Agency
Office of Water
Office of Science & Technology
Standards & Applied Science Division
401M Street, SW (4305)
Washington, DC 20460
(202)260-1315
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Specific information about water quality criteria, including site-specific
criteria, may be obtained from
U.S. Environmental Protection Agency
Office of Water
Office of Science & Technology
Health & Ecological Criteria Division
401M Street, SW (43 04)
Washington, DC 20460
(202) 260-0658
To purchase a copy of Quality Criteria for Water 1986, containing
summaries of all contaminants and conditions for which EPA has
developed criteria recommendations, contact
National Technical Information Center
U.S. Department of Commerce
5285 Port Royal Road
Springfield, VA 22161
(800) 553-NTIS
Order Number: PB87-226759
or
Education Resource Information Center
1929 Kenny Road
Columbus, OH 43210
(800)276-0462
Order Number: D-760
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EPA Regions
EPA Regional Water Quality Standards Coordinators
Region I Water Division
JFK Federal Building
Boston, MA 02203
(617)565-3533
(617) 565-4940 (fax)
CT, ME, VT, MA, NH,
RI
Region 2 Water Division
290 Broadway
New York, NY 10007
(212)264-5685
(212) 637-3772 (fax)
NJ, NY, Puerto Rico,
Virgin Islands
Region 3 Water Division
841 Chestnut Street
Philadelphia, PA 19107
(215)597-4491
(215) 597-3359 (fax)
DE, DC, WV, MD, PA,
VA
Region 4 Water Division
345 Courtland Street, N.E.
Atlanta, GA 30365
(4G4) 347-3555 x6633
(404) 347-1799 (fax)
AL, FL, GA, TN, KY,
NC, SC, NIS
Region 5 Water Division
77 West Jackson
Boulevard
Chicago, IL 60604-3507
(312)353-9024
(312) 8 86-7804 (fax)
IL, IN, OH, MI, MN,
Wl
Region 6 Water Division
1445 Ross Avenue
First Interstate Bank
Tower
Dallas, TX 75202
(214)665-6643
(214) 665-6689 (fax)
AR, LA, NM, OK, TX
Region 7 Water
Compliance Branch
726 Minnesota Avenue
Kansas City, KS 66101
(913)551-7441
(913) 551-7765 (fax)
IA, KS, MO, NE
Region 8 Water Division
999 18th Street
Denver, CO 80202-2405
(303)293-1586
(303) 391-6957 (fax)
CO, MT, UT, ND, SD,
WY
Region 9 Water Division
75 Hawthorne Street
San Francisco, CA
94105
(415)744-1997
(415) 744-1078 (fax)
AZ, CA, NV, HI, Palau,
Guam, American Samoa,
N. Mariana Islands
Region 10 Water Division
(WS-139)
1200 Sixth Avenue
Seattle, WA 98101
(206)553-0176
(206) 553-0165 (fax)
AK, ID, OR, WA
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APPENDIX A: GLOSSARY
This glossary includes terms used in this document and additional terms that are frequently used in
discussions of water quality standards.
The Act-refers to the Clean Water Act (Public Law 92-500, as amended (33 USC 1251, et seq.) (40
CFR 131.3)
acute—refers to short-term exposures to pollutants
Adminstrator-refers to the Administrator of the U.S. Environmental Protection Agency
ambient—refers to existing conditions in a waterbody
anthropogenic—generated or caused by the actions of humans
antidegradation policy—policy required by EPA's water quality standards regulation that States and
Indian Tribes must adopt to conserve, maintain, and protect existing uses and the water quality
necessary to protect these uses: the policy was established by the secretary of Interior in February 1968
before the creation of EPA and incorporated into the water quality standards regulation issued by EPA
in November 1975
aquatic life criteria—guidelines designed to protect all aquatic life, including plants and animals
arbitration- a dispute resolution process in which an individual or panel recommends a
solution to an issue arising between two parties. The solution recommended by the
arbitrator can be binding on the parties if they choose to make it so.
attain -achieve or reach (as a water quality goal)
background conditions—natural conditions, conditions not affected or influenced by the activities of
humans
biological integrity—the condition of the aquatic community inhabiting unimpaired water bodies of a
specified habitat as measured by community structure and function
biological criteria—narrative or numeric expressions that describe the desired biological condition
of aquatic communities inhabiting particular types of waterbodies
chronic-refers to long-term expposures to pollutants
Code of Federal Regulations-a publication of the U.S. Government that contains all EPA and other
regulations after they have received final approval. Reffered to as CFR.
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designated use—that use defined in water quality standards for each water body or segment
whether
or not the use is being attained
discharge limits—any restriction on quantities, rates, and concentrations of chemical,
physical, biological or other constituents which are discharged from point sources
discharge—the addition of any pollutant(s) to navigable waters from any point source.
dredge material-material resulting from activities such as the widening or deepening of
channels, building of canals, construction of levees
ecology (ecological)—the study of the interrelationships of organisms and their environment
effluent—waste material discharged into the environment, including waters of tile United
States
existing use—the use that has been achieved for a waterbody on or after November 28.
1975
Federal Register-a publication of the U.S. Government that includes all proposed and filial
regulations issued by EPA. Referred to as "FR."
fill material—earth used for embankments or as backfill
Food and Drug Administration-the U.S. Government agency that establishes limits used to
prohibit the sale of edible aquatic life when the concentrations of contaminants exceed
specified levels
habitat-the environment occupied by individuals of a particular species, population or
community
human health criteria—guidelines that specify the potential risk of adverse effects to
humans due to substances in the water
hydrology (hydrologic)—the science dealing with the proper-ties, distribution, and
circulation of water both on the surface of and under the earth
impaired waters—waters that fail to meet applicable water quality standards or to protect
designated uses (such as fishing or swimming)
Indian Tribe or Tribe-any Indian Tribe, band, group, community recognized by the
Secretary of the Interior and exercising governmental authority over a Federal Indian
Reservation
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Indian Reservation (Reservation, Tribal Lands)—all land within the limits of any Indian
reservation under the jurisdiction of the U.S. Government, notwithstanding the issuance of
any patent, and including rights of way running through the reservation
indigenous—existing, and having originated naturally, in a particular region or environment
Issue Dispute Resolution Mechanism—the procedure contained in the Clean Water Act for
resolving conflicts between States and Indian Tribes that adopt different water quality
standards on a common body of water
mediation—a dispute resolution process in which a neutral or impartial individual attempts to
facilitate a solution to a dispute arising between two parties by encouraging communication
and negotiation
Naitional Pollutant Discharge Elimination System—the EPA program that regulates point
source discharges through the issuance of permits to discharges and enforcement of the
terms and conditions of those permits
navigable waters—the waters of the United States, including the territorial seas
non-point source pollution—pollution sources that are diffuse and do not have a single point of
origin: run-off from agriculture, forestry, and construction sites can be non-point source pollution
organic substance—carbon-containing substances in plant and animal matter; high
concentrations are often found in municipal and industrial wastewater and in surface
runoff; organic chemicals refers to a manufactured chemical used for controlling weeds
and insect pests; many are considered to be carcinogenic
Outstanding National Resource Waters—the highest quality waters of the United States;
waters of exceptional ecological significance that are important, unique, or ecologically
sensitive.
permit-legal authority to carry out a regulated activity
point source pollution—pollution resulting from discharges into receiving waters from any
discernible, confined, and discrete conveyance, such as a pipe, ditch, or sewer
priority toxics or pollutants-those substances listed by the Administrator under Section
307(a) of the Clean Water Act
promulgate—to make known or public the terms of a proposed regulation, or to put a
regulation into action or force
Regional Administrator—the senior official in an EPA Regional Office
rulemaking—the process by which regulations or laws are enacted
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sediment(s)—transported or deposited particles derived from rocks, soils, or biological materials
sediment criteria-narrative or numeric expressions that describe the desired condition of sediments
in particular types of waterbodies; sediment criteria address the toxicity of different sediment types
in different environmental settings
States—includes the 50 United States, District of Columbia, Guam, Commonwealth of Puerto Rico,
Virgin Islands, American Samoa, Trust Territory of the Pacific Islands, and Commonwealth of the
Northern Mariana Islands, and Indian Tribes that EPA determines qualify for treatment as States for
the purpose of water quality standards
statute (statutory)—a law (having legal force)
surface waters—bodies of water on the surface of the earth, including lakes, rivers, streams,
wetlands, etc.
toxic substance/pollutant—substances (or pollutants) that, after discharge and upon exposure, ingestion,
inhalation, or assimilation into any organism, either directly from the environment or indirectly by
ingestion through food chains, will, or on the basis of information available to the Administrator, cause
death, disease, behavioral abnormalities, cancer, genetic mutations, physiological malfunctions
(including malfunctions in reproduction) or physical deformations, in such organisms or their offspring
Use Attainability Analysis—a structured scientific assessment of the factors affecting the attainment of
the use which may include physical, chemical, biological, and economic factors as described in Section
131.10(g)(40CFR 131.3)
water quality standards—provisions of State or Federal law which consist of a designated use or uses for
the waters of the United Sates, water quality criteria for such waters based upon such uses, and an
antidegradation policy; water quality standards are intended to protect public health and welfare,
enhance the quality of water, and serve the purposes of the Clean Water Act
water quality criteria—criteria published by EPA under Section 304(a) for specific chemicals in water
intended to provide protection for aquatic life and human health in all surface waters on a national basis;
elements of water quality standards adopted by States under Section 303(c), which describe the quality of
water that will support a particular use
waters of the United States—refer to
(1) all waters which are currently used, were used in the past, or may be susceptible to use in
interstate or foreign commerce, including all waters which are subject to the ebb and flow of the
tide;
(2) all interstate waters, including interstate wetlands;
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(3) all other waters such as intrastate lakes, rivers, streams (including intermittent streams), mudflats,
sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa lakes, or natural ponds the use or
degradation of which would affect or could affect interstate or foreign commerce, including any such
waters:
(i) which are or could be used by interstate or foreign travelers for recreational
or other purposes;
(ii) front which fish or shellfish are or could be taken and sold in interstate
or foreign commerce;
(iii) which are or could be used for industrial purposes by industries in interstate
commerce;
(4) all impoundments of waters otherwise defined as waters of the United States under this
definition;
(5) tributaries of waters in paragraphs (1) through (4) of this definition;
(6) the territorial sea; and
(7) wetlands adjacent to waters (other than waters that are themselves wetlands) identified in
paragraphs (1) through (6) of this definition. "Wetlands" are defined as those areas that are
inundated or saturated by surface or ground water at a frequency and duration sufficient to
support, and that under normal circumstances do support, a prevalence of vegetation typically
adapted for life in saturated soil conditions. Wetlands generally include marshes, swamps,
bogs, and similar areas.
Note: Waste treatment systems, including treatment ponds or lagoons designed to meet the
requirements of the Act (other than cooling ponds as defined in 40 CFR 423.1 l(m) which also
meet the criteria for this definition) are not waters of the United States.
watershed-the region draining into a river, river system, or other waterbody
wetland—those areas that are inundated or saturated by surface or ground water at a
frequency and duration sufficient to support, and that under normal circumstances do
support, a prevalence of vegetation typically adapted for life in saturated soil conditions;
wetlands generally include swamps, marshes, bogs, and similar areas
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APPENDIX B
LIST OF SECTION 307(A) PRIORITY TOXIC POLLUTANTS
Acenaphthene
Acenapthylene
Acrolein
Acrylonitrile
Aldrin
Antimony
Anthracene
Arsenic
Asbestos
1,2 Benzanthracene
Benzene
Benzidine
Benzo (A) Pyrene
(3,4 Benzopyrene)
3,4 Benzofluoranthene
Fluoranthene
Benzo (K)
1,12 Benzoperylene
Beryllium
Bromoform
(Tribromomethane)
Bromomethane (Methyl
Bromide)
4 Bromophenyl Phenyl
Ether
Cadmium
Carbon Tetrachloride
Tetrachloromethane
Chlordane
Chlorobenzene
(Monochlorobenzene)
Chlorodibromomethane
(Halomethane)
Chloroethane
(Monochloroethane)
Chloroethyl Ether (Bis-2)
1 Chloroethoxy Methane
(Bis-2)
2 Chloroethyl Vinyl Ether
4 Chloro-3-Methylphenol
Chloromethane (Methyl
Chloroform
(Trichloromethane)
2 Chlorophenol
Chloroisopropyl Ether
(Bis-2)
2 Chloronaphthalene
4 Chlorophenyl Phenyl
Ether
Chromium (HEX and TRI)
Chrysene
Copper
Cyanide
4,4 DDT
4,4 DDE
4,4 ODD
Dibenzo (a,h) Anthracene
1,2 Dichlorobenzene
1,3 Dichlorobenzene
1,4, Dichlorbenzene
3,3 Dichlorobenzidine
1,1 Dichloroethane
1,2 Dichloroethane
1,1 Dichloroethylene
1,2 Trans-Dichloroethylene
Dichlorobromomethane
(Halomethanes)
2,4,Dichlorophenol
1,2 Dichloropropane
1,3 Dichloropropylene
Dieldrin
2,4 Dimethylphenol
Diethylphthalate
Dimethylphthalate
2,4 Dinitrotoluene
2,6 Dinitrotoluene
2,4 Dinitrophenol
Dioxin (2,3,7,8-TCDD)
1,2 Diphenylhydrazine
Alpha Endosulfan
Beta Endosulfan
Endosulfan Sulfate
Endrin
Endrin Aldehyde
Ethylbenzene
Fluorene
Fluoranthene
Heptachlor
Heptachlor Epoxide
Hexachloroethane
Hexachlorobenzene
Hexachlorobutadiene
Hexachlorocyclohexane
(Lindane)
Hexachlorocyclohexane
(Alpha)
Hexachlorocyclohexane
(Beta)
Hexachlorocyclohexane
(Delta)
Hexachlorocyclopentadiene
Ideno (1,2,3-cd) Pyrene
(PAH)
Isophorone
Lead
Mercury
Naphthalene
Nickel
Nitrobenzene
2 Nitrophenol
4 Nitrophenol
4,6 Dinitro-2-Methylphenol
Nitrosodimethylamine N
Nitrosodiphenylamine-N
Nitrosodi-N-Propylamine-N
PCB 1242
PCB 1254
PCB 1221
PCB 1232
PCB 1248
PCB 1260
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PCB 1016
Phenol
Pentachlorophenol
Phenanthrene (PAH)
Bis (3 Ethyl Hexyl)
Phthalate
Butyl Benzyl Phthalate
Di-N-Butyl Phthalate
Di-N-Octyl-Phthalate
Pyrene (PAH)
Selenium
Silver
1,1,2,2 Tetrachloroethane
Tetrachloroethylene
Thallium
Toluene
Toxaphene
L2,4 Trichlorobenzene
1,1,1 Trichloroethane
1,1,2 Trichloroethane
Trichloroethylene
2,4,6 Trichlorophenol
Vinyl Chloride
(Chloroethylene)
Zinc
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