2014 303(d) List Approved
18 May 2015 - USEPA Region 6 has approved Oklahoma's 2014 303(d) list of impaired waters. The approval letter and decision document describe the approval process in detail.
The 2014 303(d) list of Category 5 (impaired) waterbodies is found in Appendix C of the 2014 Integrated Report ("Water Quality in Oklahoma - 2014"). The 2014 303(d) list is considered the state's official list of impaired waters until the 2016 303(d) list is approved by USEPA Region 6.
2014 Water Quality Assessment Summary
During the 2013-2014 reporting cycle, there were a total of 4,203
waterbodies delineated into the Oklahoma Assessment Database (ADB).
These waters include approximately 32,988 river and stream miles and
621,050 lake acres.
Each beneficial use of an
assessed waterbody is evaluated based on real data according to the
State's well-formed, science-based assessment methodology. This
methodology categorizes waters into one of five categories. A summary of the assessment results are shown
2014 Water Quality Assessment Summary
Clean Water Act (CWA) Section 303(d) Requirements
The 1972 amendments to the Clean Water Act include Section 303(d). The
regulations implementing Section 303(d) require states to develop lists
of water bodies that do not meet water quality standards and to submit
updated lists to the U. S. Environmental Protection Agency (EPA) every
two years. Water quality standards, as defined in the Code of Federal
Regulations, include beneficial uses, water quality objectives
(narrative and numerical) and antidegradation requirements. The EPA is
required to review impaired water body lists submitted by each state
and approve or disapprove all or part of the list.
For water bodies on the 303(d) list, the Clean Water Act requires that
a pollutant load reduction plan or Total Maximum Daily Load (TMDL) be developed to correct each
impairment. TMDLs must document the nature of the water quality
impairment, determine the maximum amount of a pollutant which can be
discharged and still meet standards, and identify allowable loads from
the contributing sources. The elements of a TMDL include a problem
statement, description of the desired future condition (numeric
target), pollutant source analysis, load allocations, description of
how allocations relate to meeting targets, and margin of safety.
CWA Section 305(b) Requirements
The 1972 amendments to the Clean Water Act also include Section 305(b).
The regulations implementing Section 305(b) require states to develop
an inventory of the water quality of all water bodies in the state and
to submit an updated report to the EPA every two years. This process
was established as a means for the EPA and the U. S. Congress to
determine the status of the nation's waters.
The 305(b) Report also includes: an analysis of the extent to which
water bodies comply with the “fishable/swimmable” goal of the CWA; an
analysis of the extent to which the elimination of the discharge of
pollutants and a level of water quality achieving the
“fishable/swimmable” goal have been or will be attained, with
recommendations of additional actions necessary to achieve this goal;
an estimate of a) the environmental impact, b) the economic and social
costs, c) the economic and social benefits, and d) the estimated date
of such achievement; and finally, a description of the nature and
extent of nonpoint sources of pollutants, and recommendations of
programs needed to control them — including an estimate of the costs of
implementing such programs.
Integrated List Guidance
The US Environmental Protection Agency (USEPA) issued guidance for the
development of an Integrated Water Quality Monitoring and Assessment
Report (Integrated Report) by the States. This guidance recommends that
States integrate their Water Quality Inventory Report (Section 305(b)
of the CWA) and their Impaired Waterbodies List (Section 303(d) of the
CWA). The Integrated Report is intended to provide an effective tool
for maintaining high quality waters and improving the
quality of waters that do not attain water quality standards. The
Integrated Report will also provide water resources managers and
citizens with detailed information regarding the following:
- Delineation of water quality assessment units providing geographic display of assessment results;
- Progress toward achieving comprehensive assessment of all waters;
- Water quality standards attainment status;
- Methods used to assess water quality standards attainment status;
- Additional monitoring needs and schedules;
- Pollutants and watersheds requiring Total Maximum Daily Loads (TMDLs);
- Pollutants and watersheds requiring alternative pollution control measures;
- Management strategies (including TMDLs) under development to attain water quality standards; and
- TMDL development schedules.
The Integrated Report will streamline water quality reporting since
data sources and assessment methods will be described in detail,
providing a sound technical basis for assessment decisions. Assessment
results will also be conveyed in a spatial context, allowing a clearer
picture of water quality status and issues. Monitoring needs and
schedules will be described, facilitating the articulation of
monitoring priorities and identifying opportunities for cooperation
with other agencies and watershed partners. TMDL needs and schedules
will be defined to convey plans for water quality improvements. The
public participation aspects will provide opportunities for data
submittal and open discussion of water quality assessment methods and
Report combines the non-regulatory requirements of the Water Quality
Inventory Report (305b) with regulation driven List of Impaired
Waterbodies (303d) (i.e., only the latter mandates TMDL development).
Successful integration into a single report requires a careful meshing
of requirements and procedures. In general, Category 5 of the
Integrated Report satisfies USEPA reporting requirements under Section
303d (Impaired Waterbodies) and, combined with the remaining
Categories, document assessment under Section 305b (Water Quality
Inventory). Therefore, the regulatory requirements (i.e., EPA approval
and adoption; public participation, etc.) for 303d impaired waterbodies
listing only apply to Category 5 of the Integrated Report.
The methods used to develop the Integrated Report are described
in the Continuing Planning Process (CPP). One goal of the CPP is to provide an objective and scientifically sound waterbody
assessment listing methodology including:
For questions about the Integrated Water
Quality Assessment Report, please contact Joe Long.
2014 Integrated Report
18 May 2015
2012 Integrated Report
19 Dec 2013
2012 Continuing Planning Process (CPP)
Public Notice | Final CPP | Response to Comments
10 Dec 2012
Archive of Previous Integrated Reports and CPPs