
Missouri’s water resources play a critical and valuable role in providing our families, friends and visitors with the ability to enjoy numerous outdoor recreational opportunities. Ensuring our Missouri waters are safe to enjoy today, as well as ensure the same for future generations, is the essence of the department's mission.
Many organizations throughout Missouri monitor bodies of water across the state. The department combines this data with department-collected data and then determines if the waters meet state water quality standards. Those waters that fail to meet the standards are listed as impaired.
The goal of the federal Clean Water Act, found in U.S. Code 33 U.S.C. §1251 et seq., is "to restore and maintain the chemical, physical, and biological integrity of the Nation's waters." The department is required to report the status of Missouri's waters to the U.S. Environmental Protection Agency (EPA). More information about Missouri's monitoring and assessment program and links to our reports to EPA are provided in the tabs below.
Overview
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. EPA's elements of a state water monitoring and assessment program guidance recommends 10 basic elements of a state water monitoring and assessment program. These elements, in addition to Missouri's proposed monitoring strategy, are described in the department's A Proposal for a Water Quality Monitoring Strategy for Missouri report.
Missouri's 303(d) Streams and Lakes
Water quality standards protect the beneficial uses of water, including whole body contact (such as swimming), maintaining fish and other aquatic life, and providing drinking water for people, livestock and wildlife. 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. The 303(d) list helps state and federal agencies keep track of impaired waters not addressed by normal water pollution control programs. Links to Missouri's current and previous 303(d) lists are available in the table in the Reports and Data tab above.
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 the status of their state waters to EPA on April 1 every even-numbered year. Missouri's 305(b) integrated report provides an overview of the status of Missouri's waters. The report summarizes water quality issues and assesses the degree of progress Missouri has made toward meeting federal Clean Water Act goals. The report also includes the list of impaired waters included in the 303(d) list and maps showing what waters in the state are impaired, what pollutants affect them and the sources of those pollutants. The department must provide EPA with written methodology describing its approach for considering and evaluating existing and readily available data and information used to develop its 303(d) list of impaired waterbodies. The water quality assessments made in this report help direct future water quality management efforts to those waters most in need of restoration or protection. Links to Missouri's 305(b) report submittals are available in the table in the Reports and Data tab above.
National Water Quality Inventory Report
EPA combines the information provided by each state in their 305(b) integrated report into one National Water Quality Inventory Report to Congress. The EPA report and other information reported by states is available online at the electronic reporting database, Assessment, Total Maximum Daily Load (TMDL) Tracking and Implementation System (ATTAINS). This is the main way EPA reports the general status of water quality conditions to Congress and the public.
Upcoming Meetings
Meeting Video Attendance Available! |
Lewis and Clark State Office Building Gasconade Camp Conference Room 1101 Riverside Drive Jefferson City, Missouri |
More Info: Join the April 3 meeting using Webex Public Comment Period - Feb . 24, 2023 to April 25, 2023 Additional Materials: Draft Methodology for the Development of the 2024 Section 303(d) List, Feb. 21, 2023 |
Meeting Video Attendance Available! |
Lewis and Clark State Office Building LaCharrette/ Nightingale Conference Rooms 1101 Riverside Drive Jefferson City, Missouri |
Agenda: Clean Water Commission Agenda April 12, 2023 More Info: Join the April 12 meeting using Webex Additional Materials: Clean Water Commission Briefing Packet April 12, 2023 |
Past Meetings
Public Comment Periods
Reports and Data
This table includes 303(d) and 305(b) reporting and listing methodology information, organized by reporting year. Additional information is also available about Water Quality Data, TMDLs, and Biological Assessment Reports.
305(b) Integrated Report | Listing Methodology Document | EPA Approval Memo | EPA Approved 303(d) List | EPA Approved 303(d) Delist |
---|---|---|---|---|
2022 | 2022 CWC | 2022 CWC | ||
2020 | 2020 | 2020 | 2020 | 2020 |
2018 | 2018 | 2018 | 2018 | 2018 |
UD = Under Development
PNP = Public Notice Period
CWC = Waiting Clean Water Commission Approval
WEA = Waiting EPA Approval
-- = Not Available
Popular Links
Contact Information
Water Protection Program
Division of Environmental Quality
P.O. Box 176
Jefferson City, MO 65102-0176
United States
Water Protection Program
Impaired Waters