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The Indiana Department of Environmental Management (IDEM) develops the Integrated Water Monitoring and Assessment Report every two years to fulfill the requirements of Sections 305(b) and 303(d) of the federal Clean Water Act (CWA). The Integrated Report is submitted to U.S. EPA in even-numbered years.
The Integrated Report (as it is commonly called) is a narrative report that provides information on IDEM’s CWA programs and other programs at IDEM that work together to protect and restore Indiana waters. The Integrated Report also provides statewide summaries and waterbody-specific information on the degree to which Indiana waters are supporting their designated beneficial uses identified in the state’s Water Quality Standards (WQS).
The summary and water-body-specific information in the report comes from the water quality assessments that IDEM conducts to meet the CWA Section 305(b) requirement to assess and report on the degree to which Indiana waters support their designated beneficial uses. These assessments are made in accordance with IDEM’s Consolidated Assessment and Listing Methodology (CALM) by comparing existing and readily available water quality data to the applicable water quality criteria in the State’s water quality standards.
CWA Section 303(d) requires states to identify waters that are not meeting applicable water quality standards and as a result, are not fully supporting one or more of their designated beneficial uses. These waters are considered by IDEM to be impaired and must be placed on the Indiana’s 303(d) List of Impaired Waters.
Section 303(d) also requires state to develop Total Maximum Daily Loads (TMDLs) for the waters identified on the 303(d) list. TMDLs are reports that provide an overview of one or more impaired waters, and identify:
The 303(d) list is a subset of the Consolidated List, which provides water quality information for most of the surface waters throughout the state. For the Consolidated List, IDEM places each waterbody into one or more categories based on what is known about its water quality and the degree to which it is supporting its designated beneficial uses:
The most current Integrated Report and 303(d) list and the CALM used for their development can be found online: