2021 Top 100
57: Tetra Tech Inc.
| Top 100 Revenue: | $478,536,000 |
| Defense Revenue: | $101,620,000 |
| Civilian Revenue: | $376,916,000 |
| 2020 Revenue: | N/A |
| 2020 Earnings: | N/A |
| 2019 Revenue: | $3.1 billion |
| 2019 Earnings: | $240.5 million adjusted operating income |
| Number of employees: | N/A |
| Headquarters: | Pasadena, Calif. |
| Website: | www.tetratech.com |
| Leadership: | N/A |
| Ticker: | N/A |
| Lines of business: | N/A |
| Major customers: | N/A |
| Major contracts/projects: | N/A |