Water Quality Standards - Indiana

State of Indiana

Map of the State of Indiana

The Water Quality Standards (WQS) program in Indiana is managed by the Indiana Department of Environmental Management (IDEM). Other State Agencies, such as the Indiana Department of Natural Resources and the Indiana State Department of Health, at times work with IDEM on WQS issues.

EPA Approved Standards

Recent Water Quality Standard Decisions

Waterbody and Designated Use Data

Enviromapper for Indiana: Water Quality Standards Areas

State Administrative Code

Indiana Department of Environmental Management (IDEM) Rules, Statutes & Policies

U.S. EPA Region 5 Contact: David Pfeifer

Recent water quality standard decisions

Combined Sewer Overflow (CSO) Rule
On June 9, 2008 U.S. Environmental Protection Agency approved a change to Indiana’s water quality standards addressing combined sewer overflows. The change is consistent with EPA’s National Combined Sewer Overflows policy and the Clean Water Act. The rules clarify when a community may seek a change in the water quality standards that apply to combined sewer overflow - impacted waters.
- EPA Approval Letter of Indiana's CSO Ruling (3pp, 165KB)
- Attachment to approval letter - Enclosure: U.S. EPA Approval of New or Revised Water Quality Standards for the State of Indiana and Revisions to the State of Indiana's Approved NPDES Permitting Program (14pp, 58KB)
- Memo to EPA with attached Indiana regulations (14pp, 867KB)

Water Quality Standards - Indiana

Recent water quality standard decisions

Local Navigation