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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems.  We are aware of this issue and are diligently working on restoration.

Urbanized Area List

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

2010 Urbanized Area List

MS4 Status Report

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.