1. HDR Rosemont Illinois USA
2. HDR Tampa Florida USA
3. Bechtel OG&C Inc. Houston Texas USA
4. Hazen & Sawyer Raleigh North Carolina USA
5. Brown and Caldwell Walnut Creek California USA
6. Brown and Caldwell Miami Florida USA
7. CDM Smith Dallas Texas USA
8. Suez Water Technologies & Solutions Oakville ON Canada
9. CDM Smith Orlando Florida USA
10. Jacobs Toronto ON Canada
11. Donohue and Associates Chicago Illinois USA
12. Fluor Calgary AB Canada
13. Burns and McDonnel Denver Colorado USA
14. AECOM Houston Texas USA