American Water Works Association
http://www.awwa.org/

Chicago Department of Water Management
http://www.cityofchicago.org/WaterManagement/water.html

Illinois Section American Water Works Association
http://www.isawwa.org/

Illinois Environmental Protection Agency
http://www.epa.state.il.us/

Environmental Protection Agency
http://www.epa.gov/

DuPage County
http://www.dupageco.org/