Antidegradation

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

Proposed revisions to the Iowa Antidegradation Procedure
The Environmental Protection Commission and the Department of Natural Resources received a Petition for Rulemaking from the Iowa Association of Municipal Utilities, the Iowa League of Cities, and the Iowa Association of Business and Industry on April 25, 2016.  The following documents are related to that Petition and the resulting rulemaking:

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

• Exhibit 9A - Preliminary Review of Antidegradation Alternatives Analysis
  Exhibit 9A - Preliminary Review of Antidegradation Alternatives Analysis
   
• Financial Worksheet - Blank Form
  Financial Worksheet - Blank Form
   
• Sample Public Notice
  Sample Public Notice
   
• Public and Interagency Contact List
   

• Example Alternative Analysis for a Municipal Wastewater Facility
  Example Alternative Analysis for a Municipal Wastewater Facility
   
• Financial Worksheet - Completed Example
  Financial Worksheet - Completed Example
   
• Example Alternative Analysis for Cooling Tower Chemical Switch
   
• Example Alternative Analysis for a New Industrial Contributor to a Municipal WWTP
   

• Exhibit 3 - Waste Load Allocation Request Form and Instructions
  Exhibit 3 - Waste Load Allocation Request Form and Instructions
   
• Iowa Surface Water Classifications
  Iowa Surface Water Classifications
   
• Iowa's Outstanding Waters Map
  Printable map of overall locations of Iowa’s Outstanding Iowa Waters (OIW). For more detailed information about each specific stream, click on the individual OIW Maps shown below in the following table.

Questions? Contact:
Larry Bryant, larry.bryant@dnr.iowa.gov; 515-725-8426
Roger Bruner, roger.bruner@dnr.iowa.gov; 310-0247-8400