| Business | Phone |
| Geo Trans Inc 3685 Mt Diablo Blvd # 150, Lafayette 94549 | (925) 299-9040 |
| Johnson Wright Inc 3687 Mt Diablo Blvd # 330, Lafayette 94549 | (925) 284-9001 |
| Secor International Inc 57 Lafayette Cir, Lafayette 94549 | (925) 299-9300 |
| Tenera Environmental 971 Dewing Ave, Lafayette 94549 | (925) 962-9769 |
| Tetra Tech Inc 3746 Mt Diablo Blvd # 300, Lafayette 94549 | (925) 283-3771 |
| Adverus 3746 Mount Diablo Blvd, Lafayette 94549 | (925) 299-1284 |
| Aquifer Sciences Inc 3680 Mount Diablo Blvd # A, Lafayette 94549 | (925) 283-9098 |
| Commins Consulting 3620 Happy Valley Rd, Lafayette 94549 | (925) 284-6499 |
| Cornerstone Environmental Cntr 3527 Mt Diablo Blvd # 290, Lafayette 94549 | (925) 299-9225 |
| Corporate Ecology 3680 Mount Diablo Blvd, Lafayette 94549 | (925) 284-8499 |
| Environmental Quality Orgnztn 3685 Mount Diablo Blvd, Lafayette 94549 | (925) 962-9972 |
| Johnson Wright Inc 3687 Mount Diablo Blvd # 330, Lafayette 94549 | (925) 284-9001 |
| La Croix Pryor Davis 3685 Mount Diablo Blvd, Lafayette 94549 | (925) 299-1140 |
| Merritt Smith Consulting 3620 Happy Valley Rd, Lafayette 94549 | (925) 284-6490 |
| Mills Associates 3744 Mount Diablo Blvd # 303, Lafayette 94549 | (925) 299-0147 |
| Tetra Tech Inc 3746 Mount Diablo Blvd # 300, Lafayette 94549 | (925) 283-3771 |