Current Assessment Methodology Documents

• Methodology for Iowa’s 2018 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act

Previous Assessment Methodology Documents

• Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act

Other Documentation

• Surface Water Classification - 2008
  
  • Assembled 2006 by Iowa DNR, approved by EPA 2008. List of Iowa surface waters and their use designations.
• Iowa DNR - Impaired Waters
  • Links to downloads of previous Integrated Report documentation
• Iowa Administrative Code Chapter 61 - Water Quality Standards