Water and sewage in Virginia
- Virginia-American Water Company
- Loudoun County Sanitation Authority Inc
- Mactec Federal Programs, Inc.
- Southwood Builders, Inc.
- Lantz Construction Company
- American Infrastructure-Va, Inc.
- Amec Earth & Environmental
- Faulconer Construction Co Inc
- Precon Construction Company
- Mid Eastern Builders, Inc.
- New River Electrical Corporation
- Dewberry
- S. W. Rodgers Company, Inc.
- Chemtreat, Inc.
- E Spire Communications Inc
- BWX Technologies, Inc.
- Labat-Anderson Inc
- Suburban Grading & Utilities, Inc.
- Ecolochem Inc
- Centennial Contractors Enterprises, Inc.
- Froehling & Robertson Inc
- Degremont Technologies-Infilco
- Phipps & Bird
- Versar Inc
- Delta-T Corporation
Water and sewage