2005 Top 100
65: Tetra Tech Inc.
| Top 100 Revenue: | $145,167,391 |
| Defense Revenue: | $116,443,641 |
| Civilian Revenue: | $28,723,750 |
| 2004 Revenue: | $1.4 billion |
| 2004 Earnings: | $23.3 million |
| 2003 Revenue: | $1.1 billion |
| 2003 Earnings: | Loss of $64.6 million |
| Number of employees: | 8,000 |
| Headquarters: | Pasadena, Calif. |
| Website: | www.tetratech.com |
| Leadership: | Li-San Hwang, chairman and CEO, Sam W. Box, president Same as president |
| Ticker: | N/A |
| Lines of business: | Facilities and systems infrastructure, water resource and environmental management and security engineering and risk mitigation |
| Major customers: | Defense Department, Navy, Environmental Protection Agency and Energy Department |
| Major contracts/projects: | Tetra Tech is providing program management and technical environmental services to the Navy under a comprehensive long-term environmental action contract. |