| Business | Phone |
| Consoer Townsend Envirodyne 822 Centennial Way 250, Lansing 48917 | (517) 323-8200 |
| Enertech Engineering Co Inc 1824 E Michigan Ave 100, Lansing 48912 | (517) 372-0800 |
| Fitzgerald Henne & Assoc Inc 3125 Sovereign Dr D, Lansing 48911 | (517) 887-1100 |
| Fred White Engineering Co 2300 N Grand River Ave, Lansing 48906 | (517) 321-7111 |