Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List
2026 305(b) Assessment Summary

The 2026 assessment cycle is currently in progress.

  • Methodology Review
  • Data Processing
  • Draft IR
  • Public Comment
  • Submitted to EPA R7
  • EPA Response
  • Final IR
Assessments and summaries will be available for viewing when all assessments have been completed and the cycle is released for public commment.
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