| Business | Phone |
| Water Saver Systems 7758 Wisconsin Ave # 401, Bethesda 20814 | (301) 657-3141 |
| Stuart Gorewitz Commercial 7758 Wisconsin Ave, Bethesda 20814 | (301) 652-1181 |
| Metropolitan Water-Saving Inc 4701 Sangamore Rd # S105, Bethesda 20816 | (301) 229-1980 |