| Business | Phone |
| Northeast Laboratory Svc 508 Riverside St, Portland 4103 | (207) 878-6481 |
| Holtan Testing 160 Presumpscot St # 2, Portland 4103 | (207) 879-0649 |
| Summit Labs 1039 Riverside St, Portland 4103 | (207) 797-3311 |
| Elite Inspection Svc Inc 220 Industrial Way # 1, Portland 4103 | (207) 797-2284 |
| Exam One 15 Monument Sq, Portland 4101 | (207) 773-8800 |