| Baltimore Gas and Electric (BG&E) |
800-685-2210 |
410-685-0123 |
| Washington Gas Light Co. |
800-752-7520 |
703-750-1000 |
| Verizon |
410-954-6260 |
| Bowie Water Dept. |
301-262-6200 |
| Anne Arundel Water |
410-222-1144 |
| WSSC |
301-206-4001 |
| Pepco |
202-833-7500 |
| Howard County Water |
410-313-2058 |
| Rockville Water Dept. |
240-314-8420 |
| D.C. Water Dept. |
202-442-8000 |
| Carroll County Water |
410-386-2164 |
| Charles County Water |
301-645-0624 |
| Calvert County Water |
301-855-1243 x329 |
| Frederick Gas |
301-662-2151 |
| Allegheny Power |
800-255-3443 |
| Frederick City Water |
301-694-1421 |
| Frederick County Water |
301-694-1111 |
