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. These reports are submitted to the U.S. Environmental Protection Agency on April 1 of every even-numbered year. This process ensures that polluted waters continue to be monitored and assessed until applicable water quality standards are met.
Missouri Integrated Water Quality Report
Missouri's integrated water quality reports provide an overview of the status of Missouri's waters. The report summarizes water quality issues and evaluates the amount of progress Missouri has made toward meeting 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 water quality assessments made in this report help direct future water quality management efforts to those waters most in need of restoration or protection.
Listed below are Missouri's two most recent integrated water quality report submittals. For copies of older reports, please submit an Open Records/ Sunshine Law Request.
- 2022 Missouri Integrated Water Quality Report - 305(b) Report
- 2020 Missouri Integrated Water Quality Report - 305(b) Report
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.