State Standards in Effect for CWA Purposes
- [See Nutrient Criteria ]
(Effective December 22, 2003) Emergency rulemaking 1200-4-3-.03(3)(k) establishing a nutrient criterion applicable to all waters of the state.
- [See Chapter 1200-4-3 General Water Quality Criteria ]
(Effective December 19, 2019) State regulation establishing water quality standards for surface waters of the State.
- [See Chapter 1200-4-4 Use Classifications for Surface Waters ]
(Effective December 19, 2019) State regulation establishing use classifications for surface waters of the State.
Federally Proposed or Promulgated Standards
- None at this time.
- Nutrient Criteria (PDF)(3 pp, 138 K)
- Chapter 0400-40-03 General Water Quality Criteria (PDF)(47 pp, 530 K)
- Chapter 0400-40-04 Use Classifications for Surface Waters (PDF)(51 pp, 375 K)