All 4 companies
A–Z by legal name| Company | Registry number | Registered | Status | City |
|---|---|---|---|---|
| PARSONS TECHNICAL SERVICES INC. | 1379816 | 2003-04-03 | Active | PASADENA |
| PARSONS WATER & INFRASTRUCTURE INC. | 1388327 | 2003-05-15 | Active | PASADENA |
| TETRA TECH EC, INC. | 1369527 | 2003-02-20 | Active | PASADENA |
| UNITED AGENCIES, INC. OF CALIFORNIA (UNITED AGENCIES, INC.) | 1394373 | 2003-06-16 | Active | PASADENA |