All 6 companies
A–Z by legal name| Company | Registry number | Registered | Status | City |
|---|---|---|---|---|
| CAT TECH INC. | 0000073884 | 2003-03-03 | Dissolved | PASADENA |
| PARSONS WATER & INFRASTRUCTURE INC. | 0000074953 | 2003-05-22 | Dissolved | PASADENA |
| TETRA TECH EC, INC. | 0000073748 | 2003-02-20 | Active | PASADENA |
| TETRA TECH RMC, INC. | 0000076135 | 2003-09-04 | Merged | PASADENA |
| UNITED AGENCIES, INC. | 0000074448 | 2003-04-11 | Active | PASADENA |
| WESTPORT PETROLEUM, INC. | 0000073691 | 2003-02-13 | Dissolved | PASADENA |