Water: Water Quality Standards Academy
Basic Course: Supplemental Topics - 303(d) Submissions: Integrated Reporting Categories
- Listing Impaired Waters and Developing TMDLs
- 303(d) List and TMDLs Development
- 303(d) List: Identifying Impaired/Threatened Waters
- 303(d) List: Prioritizing Impaired/Threatened Waters
- Water Quality Reporting Requirements under CWA
- 303(d) Submissions: Integrated Report Format
- 303(d) Submissions: Integrated Reporting Categories
- TMDL Development: Introduction
- TMDL Development: The Basic Calculation
- TMDL Development: Documentation and Review
- TMDL Implementation: Pollutant Source Control Mechanisms
- 303(d) List and TMDLs: Public Participation
- Monitoring & Assessment
- NPDES Permit Program
- Human Health Ambient Water Quality Criteria
- Aquatic Life Criteria
With the Integrated Report option, EPA encourages States/Tribes to use a five-category system for classifying all water bodies (or segments) within its boundaries regarding the waters' status in meeting the State's/Tribe's water quality standards. The categories are listed below. The classification system uses designated uses as the basis for reporting on water quality.
|Category 1||All designated uses are supported, no use is threatened.|
|Category 2||Available data and/or information indicate that some, but not all, designated uses are supported.|
|Category 3||There is insufficient available data and/or information to make a use support determination.|
|Category 4||Available data and/or information indicate that at least one designated use is not being supported or is threatened, but a TMDL is not needed.|
||A State developed TMDL has been approved by EPA or a TMDL has been established by EPA for any segment-pollutant combination.|
||Other required control measures are expected to result in the attainment of an applicable water quality standard in a reasonable period of time.|
||The non-attainment of any applicable water quality standard for the segment is the result of pollution and is not caused by a pollutant.|
|Category 5||Available data and/or information indicate that at least one designated use is not being supported or is threatened, and a TMDL is needed.|
The waters from Category 5 constitute the Section 303(d) list of impaired or threatened waters within the State/Tribe's boundaries.
Key Point. EPA developed the multi-category classification system to help States/Tribes to report on incremental progress toward attaining water quality standards.
Key Point. States/Tribes may establish additional subcategories to refine their classifications further. For example, under Category 3, subcategories could be used to distinguish between segments for which no data/information is available and segments for which data/information is available but insufficient for making a use-support determination. At the Federal level, EPA has offered Subcategory 5m as a voluntary approach for listing waters impaired by mercury mainly from atmospheric sources.
For national summary information about impaired waters based on biennial reporting, visit EPA's Web site titled National Summary on Impaired Waters and TMDL Information.