| Business | Phone |
| Branham Well Drilling Contract Prince Frederick 20678 | (410) 414-3200 |
| C & C Mechanical Prince Frederick 20678 | (410) 414-5660 |
| Calvert Water Testing Inc Rr 4, Prince Frederick 20678 | (410) 586-1796 |
| Calvert Well Drilling Co 871 Solomons Island Rd S, Prince Frederick 20678 | (410) 535-2804 |