| Business | Phone |
| Advanced Plumbing Svc 3008 White Beech Dr, Harwood 20776 | (410) 451-4911 |
| Gene's Plumbing 274 Princes Ln, Harwood 20776 | (410) 798-5229 |
| Service First Plumbing-Heating 1105 Cumberstone Rd, Harwood 20776 | (410) 956-1700 |
| W L Staton Plumbing Svc 804 Richardson Dr, Harwood 20776 | (410) 956-5934 |