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Section 303(d) List of Impaired Waters

Public Comment Period Now Open for the Draft 2020 303(d) List of Impaired Waters

IDEM is now accepting comments [PDF] on the draft 2020 303(d) List of Impaired Waters and its 2020 Consolidated Assessment and Listing Methodology (CALM)

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 (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 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 2012, 2014, 2016, and 2018 cycles by IDEM’s submittal of its 303(d) lists for each of these cycles in their corresponding Integrated Reports. U.S. EPA issued a consolidated approval of all four 303(d) lists on May 9, 2019.

More information pertaining to 303(d) lists submitted prior to the 2018 Integrated Reporting cycle is available upon request by contacting IDEM’s Integrated Report Coordinator.

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.

2018 303(d) List of Impaired Waters Approved by U.S. EPA

IDEM submitted its 2018 finalized 303(d) List of Impaired Waters to U.S. EPA on August 17, 2018 as Appendix I of the 2018 Integrated Report. On May 9, 2019, U.S. EPA notified IDEM that it had consolidated its review of Indiana’s 2012, 2014, 2016, and 2018 303(d) lists. In its approval letter, U.S. EPA concluded that IDEM has met the requirements of Section 303(d) of the federal Clean Water Act and all applicable requirements in the Code of Federal Regulations for all waters submitted on its 303(d) lists to date. However, U.S. EPA has deferred action on certain waters with regard to metals issues that U.S EPA and IDEM have yet to resolve.

Appendix I includes the 303(d) List (Category 5 of Indiana’s Consolidated List) and Category 4 waters, which are those that are impaired but do not require a Total Maximum Daily Load. Combined, these categories include all known impairments to Indiana waters.

U.S. EPA Approval of Indiana’s 2018 303(d) List of Impaired Waters

On May 9, 2019, U.S. EPA issued a combined partial approval of IDEM’s 303(d) lists for the 2012 through 2018 cycles.

Public Comment Period for the Draft 2020 303(d) List of Impaired Waters

IDEM will soon publish its notice of public comment period for the draft 2020 303(d) List of Impaired Waters in the Indiana Register to formally open the 90-day public comment period. When the notice is published in the Indiana Register, this page will be updated to reflect the date of publication and the end date for the public comment period.

In the meantime, IDEM is accepting public comments on the draft 2020 303(d) list and the Consolidated Assessment and Listing Methodology (CALM) used to develop it now. IDEM will continue to accept comments for 90 days after its formal publication in the Indiana Register.

Interested parties will find all the information they need to review and provide comment on the draft 2020 303(d) list and CALM in the links below. Appendices 3 through 11, which contain supporting tables are provided in a spreadsheet format to provide the public the ability to more effectively search for information regarding specific waters of interest. Anyone experiencing difficulties accessing these tables can obtain a copy by contacting the Integrated Report Coordinator.

After the public comment period closes, IDEM will review and develop responses to all comments received. IDEM will include the public comments and its responses to U.S. EPA as part of IDEM’s 2020 IR, which will be submitted to U.S. EPA in 2020. 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.

  • Notice of Comment (NOC) Period for Indiana’s Draft 2020 303(d) List - NOC Narrative [PDF]
    • NOC Appendix 1: IDEM’s 2020 Consolidated Assessment and Listing Methodology (CALM)
    • NOC Appendix 2: IDEM’s Total Maximum Daily Load Program Priority Framework and Development Schedule
  • Draft 2020 303(d) Listing Tables Containing Supporting information for the Changes Identified in the Notice of Comment Period [XLS]
    • NOC Appendix 3: Waterbody Impairments Moved from Category 5 to Category 4A Based on Total Maximum Daily Load Development
    • NOC Appendix 4: Waterbody Impairments Removed from Category 5 Based on New or Revised Assessments Indicating Water Quality Improvements
    • NOC Appendix 5: Waterbody Impairments Added to Category 5 Based on New Assessments
    • NOC Appendix 6: Waterbody Impairments Removed from Category 5 as a Result of Ongoing Review to Ensure Accuracy in 303(d) Listing
    • NOC Appendix 7: Waterbody Impairments Added to Category 5 as a Result of Ongoing Review to Ensure Accuracy in 303(d) Listing
    • NOC Appendix 8: Waterbody Impairments Removed from Category 5 Based on Changes in Segmentation
    • NOC Appendix 9: Waterbody Impairments Added Back to Category 5 Based on Changes in Segmentation
    • NOC Appendix 10: Indiana’s Draft 2020 303(d) List of Impaired Waters (Category 5 of Indiana’s Consolidated Listing of All Waters)
    • NOC Appendix 11: Impaired Waters that do not require a Total Maximum Daily Load (TMDL) Under Section 303(d) of the Clean Water Act (Category 4 of Indiana’s Consolidated Listing of All Waters)
    • NOC Appendix 12: TMDL Key for Category 4A Waters Identified in Appendix 11

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