2011 Top 100
86: Tetra Tech Inc.
| Top 100 Revenue: | $196,537,000 |
| Defense Revenue: | $82,601,000 |
| Civilian Revenue: | $113,936,000 |
| 2010 Revenue: | $2.2 billion |
| 2010 Earnings: | $76.8 million |
| 2009 Revenue: | $2.3 billion |
| 2009 Earnings: | $87 million |
| Number of employees: | 12000 |
| Headquarters: | Pasadena, Calif. |
| Website: | www.tetratech.com |
| Leadership: | Dan L. Batrack, chairman, president and CEO |
| Ticker: | N/A |
| Lines of business: | Environmental consulting services, technical support services, engineering and architecture services and remediation and construction management |
| Major customers: | Defense Department, Navy, Army, National Science Foundation, Federal Aviation Administration and U.S. Agency for International Development |
| Major contracts/projects: | N/A |