Water Quality Standards

The Illinois Pollution Control Board, a sister Agency to the Illinois EPA, promulgates water quality standards in Illinois. Two Sections of 35 Illinois Administrative Code (IAC), Section 302, Water Quality Standards and Section 303, Water Use Designations and Site Specific Water Quality Standards contain the standards applicable to lakes and streams. Procedures to be followed in using water quality standards to set NPDES permit limits are found in Section 309. Other implementation procedures are found in Agency Rules.

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