Water and sewage in Illinois
- Advance Mechanical Systems, Inc.
- International Air Filtration
- Illinois-American Water Co
- Ewing-Doherty Mechanical, Inc.
- US Water LLC
- Mc Cauley Mechanical Cnstr
- Indeck Energy Services, Inc.
- ANGUS Chemical Co.
- Munie Company
- Sargent & Lundy LLC
- Midco International, Inc.
- Murphy Bros Inc
- Aquion Partners Ltd Partnr
- Dupage Water Commission
- CLC Lubricants Co. Of Geneva & Rockford
- North Shore Sanitary District, Inc
- J Henderson Joseph and Son Inc
- Americas Power Partners Inc
- CBI Industries
- Ellis Corp.
- United States Fire Protection Inc.
- Schneider's Trucking Inc
- SGS Environmental Services Inc.
- Impregilo International U.S.A., Inc
- Rossi Contractors, Inc
Water and sewage