| Business | Phone |
| A A Action Waterproofing Inc Bel Air 21014 | (410) 420-0100 |
| A Affordable Bel Air 21014 | (410) 638-8137 |
| B-Dry System Bel Air 21014 | (410) 836-2243 |
| Maryland Waterproofing & Radon Bel Air 21014 | (410) 638-8137 |
| Oriole Basement Waterproofers 1806 N Fountain Green Rd, Bel Air 21015 | (410) 879-3360 |
| Oriole Basement Waterproofers 901 Henderson Rd, Bel Air 21014 | (410) 879-3360 |