antideg_final10.pdfAntidegradation refers to federal regulations designed to maintain and protect high quality waters and existing water quality in other waters from unnecessary pollution.

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  

Additional Antidegradation Resources
Forms and Information		*.pdf
Exhibit 9A - Preliminary Review of Antidegradation Alternatives Analysis
Financial Worksheet - Blank Form
Sample Public Notice
Public and Interagency Contact List
Examples		*.pdf
Example Alternative Analysis for a Municipal Wastewater Facility
Financial Worksheet - Completed Example
Example Alternative Analysis for Cooling Tower Chemical Switch
Example Alternative Analysis for a New Industrial Contributor to a Municipal WWTP
Other		*.pdf
Exhibit 3 - Waste Load Allocation Request Form and Instructions
Iowa Surface Water Classifications
Outstanding Iowa Waters (OIW) Maps - See document library at bottom of this page

 Process Charts
- Antidegradation Process when Construction is Needed 
- Antidegradation Process for a New Discharger without Construction 
- Antidegradation Process for an Amendment to an NPDES Permit 
- Antidegradation Process for NPDES Permit Renewals 
- Antidegradation Process for Wastewater Construction Projects 
  
Antidegradation Training Presentations - June 28, 2010
Antidegradation Workshop - Chuck Corell 
Background & Scenarios - Adam Schnieders 
Role of WES - Satya Chennupati 
Waste Load Allocation Form - Connie Dou 
Alternatives Analysis - Larry Bryant 
Affordability Analysis - Terry Kirschenman 
Exhibit 9b - Terry Kirschenman 
Antidegradation Flow Chart - Lori McDaniel 

Antidegradation Rulemaking Documents
Antidegradation Final Rule - Published 1/13/10  
Antidegradation Fiscal Impact Statement - Updated November 2008  
Regulatory Analysis for OIW - IAB published 10/21/09  
Antidegradation Public Comment Responsiveness Summary  
EPA Approval 9/30/10 


Questions? Contact:
Larry Bryant, larry.bryant@dnr.iowa.gov; 515-281-6759
Connie Dou, connie.dou@dnr.iowa.gov; 515-281-3350