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Water Quality Information

The Illinois Water-Quality Information Mapping Tool provides access to water-quality information collected and distributed by the Illinois EPA. This information fulfills requirements identified in the Federal Clean Water Act. Users of the Mapping Tool can locate, create, and print maps of any area within Illinois providing lake and stream information as well as geographic reference information (streets, towns, highways, etc). This site was developed through a cooperative effort between Illinois EPA and the United States Geological Survey (USGS).

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Source Water Assessment Program Mapping Tool
 
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