Water Quality Standards - Illinois

The Water Quality Standards (WQS) program in Illinois is managed by the Illinois Environmental Protection Agency (IEPA). The Illinois Pollution Control Board is responsible for adopting Illinois' environmental regulations and deciding contested environmental cases. Other State agencies, such as Illinois Department of Natural Resources, Illinois Natural History Survey, and Illinois Department of Public Health, at times work with IEPA on WQS issues.

• EPA approved standards
• Waterbody and Designated Use Data
• Enviromapper for Illinois
• State Administrative Code
• IEPA Water Quality Standards Information
• Illinois Pollution Control Board
• Illinois Water Quality Mapping Tool
• Illinois Water Quality Reports