Missouri Water Quality 305(b) Report

Under Section 303(d), 305(b) and 314 of the Clean Water Act each state is required to report to the U.S. Environmental Protection Agency (EPA) on the status of their state waters on April 1 every even numbered year. The information provided by the states in their 305(b) integrated report are combined into one National Water Quality Inventory Report to Congress. The report and other information are available from EPA's electronic reporting database (ATTAINS). This is the primary way for EPA to report the general status of water quality conditions to Congress and the public.

The Missouri 305(b) Integrated Report provides an overview of the status of Missouri's waters. This water quality report fulfills EPA's reporting obligation. The report summarizes water quality issues and judges the degree of progress Missouri has made toward meeting federal Clean Water Act goals. The water quality assessments made in this report will help direct future water quality management efforts to those waters most in need of restoration or protection. This report also includes the list of impaired waters that are in the 303(d) List. See the table below for links to Missouri's 305(b) integrated report submittals.

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Missouri's 303(d) Streams and Lakes

The goal of the Clean Water Act is (33 U.S.C. §1251(a)) "to restore and maintain the chemical, physical, and biological integrity of the Nation's waters." Section 303(d) of the federal Clean Water Act requires that each state identify waters not meeting water quality standards and for which adequate water pollution controls have not been required. Water quality standards protect such beneficial uses of water as whole body contact (such as swimming), maintaining fish and other aquatic life, and providing drinking water for people, livestock and wildlife. The 303(d) List helps state and federal agencies keep track of impaired waters not addressed by normal water pollution control programs. See the table below for links to Missouri's 303(d) List of impaired waterbodies.

Missouri's Monitoring and Assessment Program

Under Section 106(e)(1) of the Clean Water Act, EPA provides monitoring support to eligible state monitoring programs. The Elements of a State Water Monitoring and Assessment Program recommends 10 elements of a state water monitoring and assessment program.. These elements, in addition to Missouri's proposed monitoring strategy, are described in A Proposal for a Water Quality Monitoring Strategy for Missouri. In addition to a biennial submittal of a 303(d) List of impaired waterbodies to EPA, the state must also provide written methodology describing their approach for considering and evaluating existing and readily available data and information used to develop their 303(d) List of impaired waterbodies. See the table below for links to Missouri's Listing Methodology Document submittals.

Biennial Reporting Requirements

2020 303(d) List

Solicitation Request for Readily Available and Qualified Water Quality Data
2020 Integrated Reporting Cycle

Listing Methodology Document

The Clean Water Commission approved the 2020 Listing Methodology Document on July 18, 2019.


2018 303(d) List

The U.S. EPA approved the 2018 303(d) List of Impaired Waters on Aug. 30, 2019.


2022 Listing Methodology Solicitation of Topics - Sept. 3, 2019 through Oct. 3, 2019

The Department will be soliciting topics to be considered for changes to the 2022 Listing Methodology Document. Additional information on submission of topics will be provided soon.


Upcoming Meetings

Nothing scheduled at this time

Past Meetings

Department of Natural Resources Video Archives Webpage

March 15, 2019 - Public Meeting - 2020 Listing Methodology Document
Meeting Summary

Feb. 22, 2019 - Public Meeting - 2020 Listing Methodology Document
Meeting Summary

Sept. 21, 2018 - Clean Water Commission Work Session
Kleekamp Presentation
Kleekamp Thesis - Streams in a Changing Landscape: Identifying Candidate Reference Reaches to Assess the Physical and Biotic Integrity of Missouri's Wadeable Streams
Development of Reference Reaches for Missouri Streams
Candidate Headwater Reference Segments Shapefile


Monitoring Information and Mapping Resources
Water Quality Monitoring Data Search-Access this link for water quality data used for 303(d) Listings
Water Quality Data Source
Environmental Services Program Reports and Database-Access this link for biological data used for 303(d) Listings
Geographic Information Systems (GIS)

303(d) and 305(b) Reporting Information - Organized by reporting year. A link to the Total Maximum Daily Loads are also included below. Once a TMDL is developed and approved by EPA, the water may be delisted from the 303(d) List.

305(b) Integrated Report Listing Methodology Document EPA Approval Memo EPA Approved 303(d) List 303(d) List Assessment Worksheets EPA Approved 303(d) Delist 303(d) Delist Assessment Worksheets Total Maximum Daily Loads
2018 2018 2018 2018 2018 2018 2018  
2016 2016 2016 2016 2016 2016 2016  
2014 2014 2014 2014 2014 2014 2014 What are TMDLs?
2012 2012 2012 2012 2012 2012 2012 EPA approved TMDLs
2010 2010 2010 2010 2010 2010 2010 TMDLs under development
2008 2008 2008 2008 -- -- --  
2006 2006


2004/2006 -- -- --  
2004 2004


2004/2006 -- -- --  
2002 2002 2002 2002 -- -- --  
-- -- -- -- -- -- --  
-- -- -- 1998 -- -- --  

Excel versions of these spreadsheets are available upon request by email.

P = Partial
F - Final
UD = Under Development
PNP = Public Notice Period
CWC = Waiting Clean Water Commission Approval
WEA = Waiting EPA Approval
-- = Not Available