2016 Top 100
63: Tetra Tech Inc.
| Top 100 Revenue: | $292,726,000 |
| Defense Revenue: | $54,501,000 |
| Civilian Revenue: | $238,225,000 |
| 2015 Revenue: | $2.3 billion |
| 2015 Earnings: | $672 million |
| 2014 Revenue: | N/A |
| 2014 Earnings: | N/A |
| Number of employees: | N/A |
| Headquarters: | Pasadena, Calif. |
| Website: | www.tetratech.com |
| Leadership: | Dan Batrack, president and CEO William Brownlie, SVP, Enterprise Risk Management |
| Ticker: | N/A |
| Lines of business: | Consulting, technical services, design, engineering, program management |
| Major customers: | N/A |
| Major contracts/projects: | Alliant GWAC, LOGWORLD, MOBIS, OASIS, PES |