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

Section 303(d) and Listing Methodology
Information presented to the Clean Water Commission for approval:

2016 303(d) List

2018 Listing Methodology

Solicitation Request for Readily Available and Qualified Water Quality Data

Monitoring Information and Mapping Resources

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

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

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