Water: Module 4
Basic Course: Key Concepts (Module 4.d)
Parameters: A Three-Tiered Program
- Module 1: Overview
- Module 2: Use
- Module 3: Criteria
- Module 4: Antidegradation
- Module 5: Flexibilities
- Module 6: Review
- Certificate of Completion
The general parameters of a State or Tribe’s antidegradation program must address three categories.
- Tier 1.
- Protection of water quality for existing uses.
- Tier 2.
- Protection of high quality waters.
- Tier 3.
- Outstanding National Resource Waters.
Key Point. For all tiers, a State or Tribe's review of activities that raise antidegradation considerations should be documented and subject to public review and comment.
At a minimum, States/Tribes must apply their antidegradation program to activities that are regulated under State, Tribal, or federal law, including:
- Any activity that requires a permit or water quality certification.
- Any activity subject to State/Tribal non-point source control requirements or regulations.
- Any activity that is otherwise subject to State/Tribal regulations specifying that water quality standards are applicable.
Key Point. Federal antidegradation requirements do not create State/Tribal regulatory authority over otherwise unregulated activities.