| Business | Phone |
| Stratum Engineering Inc 3751 Pennridge Dr # 119, Hazelwood 63044 | (314) 739-1987 |
| Superior Engineering & Svc 11950 Missouri Bottom Rd, Hazelwood 63042 | (314) 731-0909 |
| Shaw Environmental 110 James S Mcdonnell Blvd, Hazelwood 63042 | (314) 895-2100 |
| Midwest Testing Inc 3377 Hollenberg Dr, Hazelwood 63044 | (314) 739-2727 |
| John R Grindon & Assoc 320 Brookes Dr # 100, Hazelwood 63042 | (314) 895-4747 |
| Gredell Engineering Resources 3460 Hollenberg Dr, Hazelwood 63044 | (314) 344-3574 |
| Hanson Engineers Inc Hazelwood 63043 | (314) 739-3744 |
| Earth Tech Inc 444 Mcdonnell Blvd, Hazelwood 63042 | (314) 436-7811 |
| Decisions & Advanced Tech 13723 Riverport Dr, Hazelwood 63043 | (314) 291-4276 |