Triennial Review

Under the Clean Water Act, a state shall from time-to-time hold public meetings for the purpose of reviewing applicable water quality standards and, as appropriate, modifying and adopting standards. See Chapter 61: Water Quality Standards. This review includes, but is not necessarily limited to:

  • Designated Uses:
    Any water body segment with a water quality standard that does not include A1, B(WW-1) shall be re-examined to determine if there is any new information available.
  • Criteria:
    New or old criteria for different constituents
  • Antidegradation:
    Protect existing water quality


Linked below are documents relating to current and past Triennial Reviews for Iowa's water quality standards.

 2015-2017 Triennial Review Documents:


 2012-2014 Triennial Review Documents:

 Triennial Review Technical Advisory Meeting: June 29, 2011


For questions about the Triennial Review, please contact Matthew Dvorak:

Matthew Dvorak
Iowa Department of Natural Resources
502 East 9th Street
Des Moines, IA 50319-0034