Buy your Hunting and Fishing license online today! We offer multi-year packages and combos for whatever you need to stay licensed.
Support conservation in Iowa by buying a natural resource plate for your vehicle.
Make your online reservation for state park cabins, camping sites and lodges.
Iowa DNR Customer Service
Mon - Fri, 8:00am - 4:30pm CST
Submit Online Inquiry
Contact Information by County
Information / Records Requests
Water Quality Standards rules, rule reference documents, and other key information used by the department can be found in the links below for easy reference:
Iowa Administrative Code, Chapter 61: Water Quality Standards
Antidegradation Implementation Procedure – Effective February 17, 2010
Surface Water Classifications Document - Effective June 17, 2015
Aquatic Life Assessment Field Data Sheet
Warm Water Stream Use Designation Protocol, updated March 22, 2006
Cold Water Protocol - Effective December 15, 2004
Recreational Use Assessment and Attainability Analysis Protocol
Basin Plan Support Document – Introduction
Basin Plan Support Document – Wasteload Allocations