| Business | Phone |
| Aae Inc 790 E Colorado Blvd, Pasadena 91101 | (626) 657-6000 |
| Angeles Crest Engineering Inc 30 N Raymond Ave # 802, Pasadena 91103 | (626) 744-1789 |
| Carollo Engineers 199 S Los Robles Ave # 530, Pasadena 91101 | (626) 535-0180 |
| Crescenta Valley Engineering 2801 E Foothill Blvd, Pasadena 91107 | (626) 568-8900 |
| Environmental Defense Sciences 723 E Green St, Pasadena 91101 | (626) 744-1766 |
| Flow Science Inc 723 E Green St, Pasadena 91101 | (626) 304-1134 |
| Forensis Group 3452 E Foothill Blvd # 1160, Pasadena 91107 | (626) 795-5000 |
| Geo Syntec Consultants 200 E Del Mar Blvd # 250, Pasadena 91105 | (626) 449-0664 |
| Gerald Lehmer & Assoc 1000 E Walnut St # 236, Pasadena 91106 | (626) 796-3217 |
| Jacobs Engineering Group Inc 1111 S Arroyo Pkwy, Pasadena 91105 | (626) 578-3500 |
| Land Design Consultants Inc 225 S Lake Ave # 600, Pasadena 91101 | (626) 578-7000 |
| Miyamoto Intl 48 S Chester Ave, Pasadena 91106 | (626) 585-9680 |
| Ted Jacob Engineering 265 N Euclid Ave, Pasadena 91101 | (626) 396-0400 |
| Urs Corp 566 El Dorado St, Pasadena 91101 | (626) 449-7650 |
| Wheeler & Gray 3452 E Foothill Blvd, Pasadena 91107 | (626) 432-5850 |
| Zacharias Vorgias Engineering 232 N Lake Ave # 212, Pasadena 91101 | (626) 441-1752 |
| Consulting Electric 232 N Lake Ave, Pasadena 91101 | (626) 577-0449 |
| Frederic Derrien Pasadena 91101 | (626) 578-0862 |
| Ellis J Jones Consulting Engnr Pasadena 91101 | (626) 585-9054 |
| Land Design Consultants Inc 199 S Los Robles Ave # 250, Pasadena 91101 | (626) 578-7000 |
| Nochebuena R & D 230 S Madison Ave # 102, Pasadena 91101 | (626) 584-0448 |
| S Privett & Assoc 16 N Marengo Ave, Pasadena 91101 | (626) 796-3593 |
| Jacobs Engineering Group Inc 1111 S Arroyo Pkwy, Pasadena 91105 | (626) 449-2171 |
| Ashoka Group 30 N Raymond Ave, Pasadena 91103 | (626) 744-9982 |
| Advanced Projects Research Inc Pasadena 91104 | (626) 794-5432 |
| Fountainhead Consultants Inc 335 Wallis St, Pasadena 91106 | (626) 403-3340 |
| Global Consulting Co 309 N Holliston Ave # 10, Pasadena 91106 | (626) 796-1038 |
| Sonntag Engineers & Assoc 711 N El Molino Ave, Pasadena 91104 | (626) 793-5848 |