| Business | Phone |
| Clean Cities Fleet Svc 31 E 31st St, Baltimore 21218 | (410) 455-9292 |
| Clean Water Fund 2229 N Charles St, Baltimore 21218 | (410) 889-4055 |
| Clean Water Fund Inc 200 Cold Spring Ln, Baltimore 21218 | (410) 235-8808 |
| Coalition To End Childhood 2714 Hudson St, Baltimore 21224 | (410) 534-6447 |
| Conner Environmental Svc 1421 Clarkview Rd # 100, Baltimore 21209 | (410) 296-7971 |
| Continental Divide Trail Soc 3704 N Charles St # 601, Baltimore 21218 | (410) 235-9610 |
| Davis Ship Svc 1400 E Clement St, Baltimore 21230 | (410) 625-2672 |
| Environmental Health Assoc Baltimore 21201 | (410) 528-1133 |
| Maryland Public Interest Rsrch 3121 Saint Paul St # 26, Baltimore 21218 | (410) 467-0439 |
| Columbia Technologies 1450 S Rolling Rd, Baltimore 21227 | (410) 536-9911 |
| Trust For The Public Land 3000 Chestnut Ave, Baltimore 21211 | (410) 243-3698 |
| Environmental Protection Cert Baltimore 21220 | (410) 252-3335 |
| Environmental Validation 8520 Westerman Cir, Baltimore 21236 | (410) 256-8500 |