2013 Top 100
55: Tetra Tech Inc.
| Top 100 Revenue: | $384,057,000 |
| Defense Revenue: | $63,013,000 |
| Civilian Revenue: | $321,044,000 |
| 2012 Revenue: | $2.7 billion |
| 2012 Earnings: | $104,380 |
| 2011 Revenue: | N/A |
| 2011 Earnings: | N/A |
| Number of employees: | 14,000 |
| Headquarters: | Pasadena, Calif. |
| Website: | www.tetratech.com |
| Leadership: | Dan L. Batrack, Chairman, President and CEO |
| Ticker: | N/A |
| Lines of business: | Water, Environment, Energy, Infrastructure, Natural Resources |
| Major customers: | N/A |
| Major contracts/projects: | Alliant GWAC, MOBIS, LOGWORLD, FABS |