| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | 2nd Century Plumbing | plumbing contractor | 1 |
| 2 | 4 G Plumbing & Heating Inc | plumbing contractor | 0 |
| 3 | A1 Plumbing Masters Inc. | plumbing contractor | 0 |
| 4 | A ALL Porpoise Services Inc | plumbing contractor | 1 |
| 5 | A & A Plumbing Inc. | plumbing contractor | 2 |
| 6 | Aaron Plumbing Contractor of Miami Inc. | plumbing contractor | 1 |
| 7 | Aarons Plumbing Corporation | plumbing contractor | 1 |
| 8 | A A Schleman Plumbing | plumbing contractor | 3 |
| 9 | Abbott Industries, Inc. | plumbing contractor | 2 |
| 10 | AB CJ Björnberg | plumbing contractor | 2 |
| 11 | A B C Plumbing Co. Inc. | plumbing contractor | 1 |
| 12 | Abc Plumbing Company Inc | plumbing contractor | 1 |
| 13 | Abe Plumbing & Heating | plumbing contractor | 1 |
| 14 | Abitua Mechanical | plumbing contractor | 2 |
| 15 | Able Plumbing | plumbing contractor | 1 |
| 16 | ABL Plumbing & Heating | plumbing contractor | 1 |
| 17 | A B L Plumbing & Heating Corp | plumbing contractor | 0 |
| 18 | AB Rörläggaren | plumbing contractor | 1 |
| 19 | Abr Plumbing And Heating | plumbing contractor | 1 |
| 20 | AB Täby Rör | plumbing contractor | 1 |