IN.gov - Skip Navigation

Note: This message is displayed if (1) your browser is not standards-compliant or (2) you have you disabled CSS. Read our Policies for more information.


Subscribe for e-mail updates
Print This Page Rate This Page Suggest a Link E-mail This Page HELP Find a Person Find an Agency

IDEM > Monitoring > Water Monitoring > Impaired Waters - Section 303(d) Impaired Waters - Section 303(d)

The IDEM develops Indiana’s 303(d) List of Impaired Waters every two years as part of the state’s Integrated Water Monitoring and Assessment Report (IR), which is submitted to the U.S. EPA every two years in accordance with Sections 305(b) and 303(d) of the Clean Water Act (CWA). CWA Section 305(b) requires states to make water quality assessments and provide water quality reports to the U.S. EPA, and CWA Section 303(d) requires states to identify waters, through their Section 305(b) water quality assessments, that do not or are not expected to meet applicable water quality standards with federal technology based standards alone. Under CWA Section 303(d), states are also required to develop a priority ranking for these waters taking into account the severity of the pollution and the designated uses of the waters. Once this listing and ranking of impaired waters is completed, states are required to develop Total Maximum Daily Loads (TMDLs) for these waters in order to achieve compliance with the water quality standards. These requirements were met for the 2008 cycle by the submission of Indiana’s IR to the U.S. EPA and the subsequent approval of Indiana’s 303(d) list by that agency.

For more information contact the 305(b)/303(d) Coordinator: (317) 234-1424

Indiana’s 2008 303(d) List of Impaired Waters

Approved by U.S. EPA on May 21, 2008