| Business | Phone |
| Consoer Townsend Envirodyne G3255 Beecher Rd 700a, Flint 48532 | (810) 720-2950 |
| Wade-Trim Inc 601 N Saginaw St, Flint 48502 | (810) 235-2555 |
| Trans Environmental Engineers 5466 N Genesee Rd, Flint 48506 | (810) 250-9220 |
| Gould Engineering Inc 2040 E Maple Ave, Flint 48507 | (810) 743-9120 |
| Rowe Inc 6211 Taylor Dr, Flint 48507 | (810) 341-7500 |
| Richard H Kraft Engineering 409 W 7th St, Flint 48503 | (810) 234-2694 |