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Nonpoint Source Water Pollution

Nonpoint Source > Watershed Assessment > Water Quality Assessments and Reporting > Section 303(d) List of Impaired Waters Section 303(d) List of Impaired Waters

The IDEM Office of Water Quality (OWQ) develops Indiana's 303(d) List of Impaired Waters as part of the state's Integrated Water Monitoring and Assessment Report, 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 state 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 2008 Integrated Report to the U.S. EPA and the subsequent approval of Indiana's 2008 303(d) list by that agency.

On May 8, 2013, U.S. EPA issued a partial approval of Indiana's 2010 303(d) list. More information pertaining to IDEM's 2010 cycle submittal and U.S. EPA's decision can be found 2010 Section 303(d) List of Impaired Waters page.

IDEM submitted its 2012 303(d) List of Impaired Waters to the U.S. EPA on April 1, 2012.

On December 28, 2012, IDEM submitted a revised 303(d) list as part of an addendum to the 2012 Integrated Report. To date, the U.S. EPA has not issued a decision regarding Indiana’s 2012 303(d) List of Impaired Waters. More information on IDEM’s 2012 303(d) list can be found on the 2012 Section 303(d) List of Impaired Waters page.

General information on the 303(d) list is available on the Section 303(d) List Frequently Asked Questions page. You may also contact the Integrated Report Coordinator with any questions you have regarding the 303(d) list.

2014 303(d) List of Impaired Waters

The following links, together, comprise the Notice of Comment (NOC) Period for Indiana’s Draft 2014 303(d) List (Appendix H of the 2014 Integrated Report).

Finalized 2014 303(D) List Of Impaired Waters And Related Information Submitted To U.S. EPA In IDEM’s 2014 Integrated Report Addendum On September 25, 2015

The links below together identify all known waterbody impairments in Indiana (Categories 4 and 5 of Indiana’s Consolidated List) based on IDEM’s Clean Water Act Section 305(b) water quality assessments. These files are provided in a spreadsheet format to facilitate sorting and searching of the information they contain. Appendix H, Attachment 2 duplicates the same attachment submitted with the 2014 IR addendum in PDF format. Appendix I, Attachment 4 provides Indiana’s finalized 2014 303(d) list, which supersedes the draft 2014 303(d) list submitted with the 2014 Integrated Report to U.S. EPA on April 1, 2014.