All 3 companies
A–Z by legal name| Company | Registry number | Registered | Status | City |
|---|---|---|---|---|
| Parsons Technical Services Inc. | 000131097 | 2003-04-07 | Active | PASADENA |
| Parsons Water & Infrastructure Inc. | 000134840 | 2003-09-18 | Active | PASADENA |
| Tetra Tech EC, Inc. | 000130217 | 2003-02-27 | Active | PASADENA |