| Business | Phone |
| Dynatest Consulting Inc 165 S Chestnut St, Ventura 93001 | (805) 648-2230 |
| Hasan Consultants 2436 E Thompson Blvd, Ventura 93003 | (805) 652-2828 |
| Hawks & Assoc 2259 Portola Rd # B, Ventura 93003 | (805) 658-6611 |
| Innovative Technology Assoc 3639 Harbor Blvd, Ventura 93001 | (805) 650-9353 |
| Interwest Consulting Group 9519 Chamberlain St, Ventura 93004 | (805) 659-0017 |
| Irj Engineers Inc 2497 Harbor Blvd # 1, Ventura 93001 | (805) 642-2355 |
| Kennedy Jenks Consultants Inc 1000 S Hill Rd # 200, Ventura 93003 | (805) 658-0607 |
| Phasex 1937 Goodyear Ave # 703, Ventura 93003 | (805) 650-4868 |
| Power & Process Engineers 1559 Spinnaker Dr # 201, Ventura 93001 | (805) 642-7933 |
| Processes Unlimited Intl Inc 260 Maple Ct, Ventura 93003 | (805) 644-8860 |
| Ramseyer & Assoc Inc 1881 Knoll Dr, Ventura 93003 | (805) 654-1088 |
| Sound & Sea Technology Inc 2175 Goodyear Ave, Ventura 93003 | (805) 642-1440 |
| T N & Assoc Inc 317 E Main St, Ventura 93001 | (805) 585-2110 |
| Water Resource Engineering 2300 Alessandro Dr, Ventura 93001 | (805) 653-7900 |