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We've Moved: The Illinois EPA Headquarters has moved to 2520 W Iles Ave, PO Box 19276, Springfield, IL 62794-9276.

Urbanized Area List

List of names delineated by the 2000 Bureau of Census that may require coverage under the MS4 permit.

MS4 Status Report

This is a status report of all MS4’s listed on the 2010 Bureau of Census List. This report will show MS4 community name, county, and permit status effective until 2/28/2021.