Aqua Illinois - Kankakee
Aqua Illinois, Inc. - University Park
Belvidere WWTP, City of
Bloomington WTP, City of
Canton, City of
Centralia WTP, City of
Commonfields of Cahokia PWD
Darien, City of
East Peoria, IL Public Works
Effingham Water Dept.
Elgin, City of
Galesburg Water Division
Huntley, Village of
 

Illinois American Water - Champaign
Jacksonville, City of
Lake County Public Works
Macomb, City of
Morris, City of
O'Fallon, City of
Ottawa, City of
South Elgin, Village of
Sycamore, City
Taylorville Water Dept.
VWNA Streator WWTP
Washington, City of