| Business | Phone |
| Central Water Treatment Co 250 Englar Rd, Westminster 21157 | (410) 857-9714 |
| Central Water Treatment Co 8 Carroll Plz, Westminster 21157 | (410) 833-4815 |
| Culligan Water Conditioning Westminster 21157 | (410) 848-7474 |
| Ecowater Systems 60 Aileron Ct # 3, Westminster 21157 | (410) 879-3199 |
| Mid Atlantic Water Westminster 21157 | (410) 840-0498 |
| Sterling Quality Water Inc 170 Airport Dr, Westminster 21157 | (410) 848-1025 |