| Business | Phone |
| Environmental Information 6811 Huron Ave, Hammond 46323 | (219) 844-4315 |
| Environmental Restoration Syst 4508 S Columbia Ave, Hammond 46327 | (219) 937-6060 |
| Great Lakes Analytical 4806 Hohman Ave, Hammond 46327 | (219) 933-1076 |
| Heritage Environmental Svc 111 142nd St, Hammond 46327 | (219) 852-1600 |
| Midwest Environmental Inc 4905 S Columbia Ave, Hammond 46327 | (219) 933-4140 |