| BLD Services, LLC | Kenner | LA | Subcontractor |
| Blocka Construction Inc. | Pleasanton | CA | Subcontractor |
| Bonita Pipeline, Inc. | Chula Vista | CA | Subcontractor |
| Brackney Inc. | Brookville | IN | $0 |
| Breshears Pump Company, LLC | Pittsburg | MO | $0 |
| Brewer Construction Oklahoma, L.L.C | Oklahoma City | OK | $0 |
| Bridgeman Civil Inc. | Suffolk | VA | $0 |
| Brock, Inc. | Auburn | MA | Subcontractor |
| Brough Construction, Inc. | Arroyo Grande | CA | Subcontractor |
| Bt Construction, Inc. | Commerce City | CO | Subcontractor |
| Buckeye Water District | Wellsville | OH | $0 |
| Buck Mountain Enterprises, Inc. | Strawberry | AZ | $0 |
| Butterfield, Inc. | Hayward | WI | $0 |
| Cabo Construction Corp. | Chicago | IL | $0 |
| Caldwell Tanks Inc. | Louisville | KY | Subcontractor |
| Calumet City Plumbing & Heating Co. Inc. | Calumet City | IL | Subcontractor |
| Calvert Utilities LLC | Severn | MD | Subcontractor |
| C.a. Murren & Sons Company, Inc. | Grayson | GA | Subcontractor |
| C.a. Murren & Sons, Company Mid-atlantic, LLC | Grayson | GA | Subcontractor |
| Ca Murren & Sons Heavy Civil LLC | Grayson | GA | Subcontractor |
| Canyon Construction Co. | Durango | CO | $0 |
| Carolina Tap & Bore, Inc. | West Columbia | SC | $0 |
| Carrigan Excavating, LLC | Lamar | CO | $0 |
| Carroll Enterprises LLC | Walterboro | SC | Subcontractor |
| C.c. Construction Inc. | Plymouth | MA | Subcontractor |
| Cci Solutions, LLCHonolulu, HI · UEI H5FFVNB64693 | Honolulu | HI | $0 |
| Cci Solutions, LLCManchester, ME · UEI PFVFJZ6ZE7N2 | Manchester | ME | $0 |
| C & D Contractors, Inc. | Grass Valley | CA | $0 |
| Celik Engineering Corporation | Carmichael | CA | $0 |
| Champion Cleaning Specialists, Inc. | Cincinnati | OH | $0 |
| Chesapeake Geosystems, Inc. | Curtis Bay | MD | Subcontractor |
| Chesapeake Utilities And Construction, Inc. | Lusby | MD | Subcontractor |
| Chris Rose's Excavating LLC | Hillsboro | WV | $0 |
| Cinch Underground Incorporated | Chipley | FL | Subcontractor |
| City Of Covington | Covington | KY | $0 |
| City Of Olympia | Olympia | WA | $0 |
| City Of San Angelo | San Angelo | TX | $0 |
| City Of Wapato | Wapato | WA | $0 |
| Clark's Directional Boring Inc. | Montross | VA | Subcontractor |
| Clayton D. Davenport Trucking, Inc. | Greenfield | MA | $0 |
| Clouser Drilling Incorporated | Grants Pass | OR | $0 |
| Clyde G. Steagall, Inc. | Loomis | CA | $0 |
| CMD Endeavors, Inc. | El Paso | TX | $0 |
| Cna Construction, Inc. | Sumter | SC | Subcontractor |
| Coakley Company, Inc. | Hot Springs National Park | AR | $0 |
| Coastal Construction Services, LLC | Severna Park | MD | Subcontractor |
| Cofells Plumbing & Heating, Inc. | Bismarck | ND | $0 |
| Commonwealth Excavating, Inc. | Verona | VA | $0 |
| Complete Plumbing, Septic & Drain Solutions, LLC | Abingdon | VA | Subcontractor |
| Complete Well & Pump Service, Inc. | Penuelas | PR | $0 |
| Connally Contracting Corp. | Welcome | MD | $0 |
| Connecticut Wells, Inc. | Bethlehem | CT | $0 |
| Construction Service Company Of Florida, Inc. | Niceville | FL | Subcontractor |
| Construction Trades Services, Inc. | Frederick | MD | Subcontractor |
| Cooper & Claiborne Construction, Inc. | Prince George | VA | Subcontractor |
| Cop Construction LLC | North Salt Lake | UT | $0 |
| Cora Constructors Inc. | Palm Desert | CA | $0 |
| Corinthian Contractors Inc. | Upper Marlboro | MD | $0 |
| Counterpoint Construction Co. Inc. | Hooper | UT | $0 |
| Crawford Construction Company | Van Buren | AR | $0 |
| Creative Enterprises Corp. | West Mifflin | PA | $0 |
| Crowder Construction Company | Apex | NC | Subcontractor |
| Cruz Tec, Inc. | Houston | TX | Subcontractor |
| CTG, Inc. | Halethorpe | MD | $0 |
| CTX Infrastructure LLC | Hammonton | NJ | $0 |
| Culbert Construction Inc. | Pasco | WA | $0 |
| Cumberland Valley Constructors, Inc. | Nashville | TN | $0 |
| Daco Construction | Campbell | CA | $0 |
| Dahlman Pump & Well Drilling, Inc. | Bow | WA | $0 |
| Dahme Construction Co. Inc. | Aberdeen | SD | $0 |
| Dakota Directional, LLC | Redfield | SD | $0 |
| Dakota Underground Co. | Fargo | ND | $0 |
| Dakota Underground Specialties, LLC. | Minot | ND | $0 |
| Dave's Excavating Inc. | Marion | IN | $0 |
| Dean's Certified Welding, Inc. | Temecula | CA | Subcontractor |
| Defalco Construction Company | Longmont | CO | $0 |
| Delco Western | West Valley City | UT | $0 |
| Dellinger Inc. | Monroe | NC | $0 |
| Delta Constructors Inc. | Flowood | MS | $0 |
| Department Of Environmental Conservation Vermont | Montpelier | VT | $0 |
| Desalitech Inc. | Marlborough | MA | Subcontractor |
| D.e. Walker Construction Co. | Charlotte | NC | $0 |
| Dh Underground, Inc. | Albuquerque | NM | Subcontractor |
| Dickenson County Public Service Authority | Clinchco | VA | $0 |
| Difazio Ind., LLC | Staten Island | NY | $0 |
| Digging Deep Construction LLC | Gable | SC | $0 |
| Dirtworks, Inc. | Palmer | AK | Subcontractor |
| D & M Contracting, Inc. | New Alexandria | PA | $0 |
| Dn Tanks, Inc. | Wakefield | MA | Subcontractor |
| DNT Construction LLC | Round Rock | TX | Subcontractor |
| Donald Maggi Inc. | Rolla | MO | $0 |
| Donald Smith | Mountain View | AR | $0 |
| Donovan Construction LLC | Crawford | ME | Subcontractor |
| Dotson And Gibbs Inc. | New London | MO | $0 |
| Doty Bros. Equipment Co. | Norwalk | CA | $0 |
| Drain Remedy, Inc. | Brockton | MA | $0 |
| Driggers Construction LLC | Hamer | SC | $0 |
| Drillpro LLC | Orlando | FL | Subcontractor |
| Driveways, Inc. | Titusville | FL | Subcontractor |
| DRM Inc. | Gillette | WY | $0 |
