Official State of Iowa Website Here is how you know


Antidegradation refers to federal regulations designed to maintain and protect high quality waters and existing water quality in other waters from unnecessary pollution.

Antidegradation Background and Additional Reference:
Introduction to Antidegradation  
Iowa Antidegradation Implementation Procedure (2-17-10) 
List of Scenarios
Frequently Asked Questions
EPA Interim Economic Guidance for Water Quality Standards

Antidegradation Forms and Information:

Example Alternative Analyses and Financial Worksheets:
Other Forms and Information:

Questions? Contact:
Larry Bryant at or 515-725-8426

Outstanding Iowa Waters