State Standards in Effect for CWA Purposes
- [See Chapter 335-6-10: Water Quality Criteria (PDF)]
(Effective July 24, 2017) - [See Chapter 335-6-11: Water Use Classifications for Interstate and Intrastate Waters (PDF)]
(Effective February 4, 2020)
Federally Proposed or Promulgated Standards
- None at this time.
- Chapter 335-6-10: Water Quality Criteria (PDF)(57 pp, 335 K)
- Chapter 335-6-11: Use Classifications for Surface Waters (PDF)(51 pp, 319 K)