Water: Module 2
Basic Course: Key Concepts (Module 2.f)
Designated Uses: Subcategories
- 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
A State/Tribe can adopt subcategories (and/or seasonal classifications) in its use classification system to further refine designated uses. For example, a State may choose to adopt subcategories to differentiate between coldwater and warmwater fisheries.
Key Point. Subcategories and seasonal uses are often used because determining water quality criteria to appropriately protect waters with broad use categories might be difficult or open to various interpretations.
Key Point. Economics may be factored into water quality standards when establishing designated uses and determining the "attainability" of those uses, not when developing water quality criteria.