| Business | Phone |
| Koon-Hall-Adrian Metallurgical 5687 Se International Way # A, Portland 97222 | (503) 653-2904 |
| Certified Testing Co Po Box 25327, Portland 97298 | (503) 297-6001 |
| Certified Testing Co 3744 Sw Sweetbriar Dr, Portland 97221 | (503) 274-2064 |
| Sgs Commercial Testing & Engrg 15550 N Lombard St, Portland 97203 | (503) 285-5905 |
| Redwood Toxicology 1949 Se 122nd Ave, Portland 97233 | (503) 408-0638 |
| Redwood Toxicology 9747 Se Powell Blvd, Portland 97266 | (503) 762-4923 |
| Ctc Analytical Svc 4943 Nw Front Ave, Portland 97210 | (503) 286-9845 |
| Oregon Medical Laboratories 545 Ne 47th Ave # B, Portland 97213 | (503) 233-2335 |
| Olivo Inc 6335 Ne 112th Ave # A, Portland 97220 | (503) 254-7119 |
| Nde Professionals Inc 7505 Ne Ambassador Pl # N, Portland 97220 | (503) 287-5255 |
| Mayes Testing Engineers 7911 Ne 33rd Dr # 190, Portland 97211 | (503) 281-7515 |
| Intertek Caleb Brett 5880 Nw Saint Helens Rd, Portland 97210 | (503) 222-3004 |