Water: Module 2
Basic Course: Key Concepts (Module 2.e)
Existing Uses: The Uses Already Attained by a Water Body
- Module 1: Overview
- Module 2: Use
- The Uses of a Water Body
- Integrity of the Nation's Waters
- CWA 101(a)(2) Uses
- The Basis for State/Tribal Water Quality Goals
- The Uses Already Attained by a Water Body
- Use Subcategories
- Subcategories for Section 101(a) Goal Uses
- Section 303 Other Uses
- Other Purposes Category
- Specify Appropriate Uses
- Changing/Removing a Designated Use
- Module 3: Criteria
- Module 4: Antidegradation
- Module 5: Flexibilities
- Module 6: Review
- Certificate of Completion
Existing uses (defined in 40 CFR 131.3(e)) are uses that were "actually attained" in a water body on or after November 28, 1975—the day EPA promulgated the original water quality standards regulation.
Determining existing uses that have been actually attained in a water body may involve evaluating data on the following:
- Historical/current water quality.
- Historical/current biological condition.
- Pattern, frequency, and type of use.
Video Clip View a 2-minute video clip from the classroom session about EPA and States/Tribes working together on water quality.
- Video (9MB)