| Business | Phone |
| Ecodeme Group Ltd 120 E Lake Ave, Baltimore 21212 | (410) 433-9091 |
| Ferntech 1100 Wicomico St # 530, Baltimore 21230 | (410) 347-7777 |
| Hazen & Sawyer 16 S Calvert St, Baltimore 21202 | (410) 539-7681 |
| Hazen & Sawyer 320 Saint Paul Pl, Baltimore 21202 | (410) 637-3386 |
| Mitsak & Assoc 808 Hatherleigh Rd, Baltimore 21212 | (410) 337-5010 |
| Page Environmental Corp Inc 1100 Wicomico St # 520, Baltimore 21230 | (410) 230-0733 |
| Penniman & Browne Inc 6252 Falls Rd, Baltimore 21209 | (410) 825-4131 |
| Datanet Engineering Inc 6334 Dogwood Rd, Baltimore 21207 | (410) 944-3600 |