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.


Mobile Site RSS Feeds
Amber Alert
Amber Alert - TEST
Subscribe for e-mail updates

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

Important Update: The public comment period for the 2010 303(d) Draft List of Impaired Waters and Consolidated Assessment and Listing Methodology extended to February 26, 2010.

The IDEM Office of Water Quality (OWQ) 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.

More information is available on the Section 303(d) List Frequently Asked Questions page, or you may contact the 305(b)/303(d) Coordinator at (317) 234-1424

2008 303(d) List of Impaired Waters

2010 Draft 303(d) List of Impaired Waters

The following spreadsheet duplicates information in the Notice of Public Comment Period and is provided to facilitate sorting and searching of the information in the listing tables included with the notice:

Stay Connected

You are leaving the IN.gov website. By clicking OK, you will be taken to a website that is not affiliated with the State of Indiana and may have different privacy and security policies. The State of Indiana is not responsible for, and does not endorse, guarantee, or monitor content, availability, viewpoints, products, or services that are offered or expressed on this non IN.gov portal website.