Regulated Water Systems
The following private water/wastewater systems are regulated by the Commission:
| Name | County | Area Served |
|---|---|---|
| Amelano Water | Frederick | Amelano Subdivision |
| Artesian Water Maryland | Cecil | Carpenters Point |
| Artesian Water Maryland | Cecil | Principio Business Park & Charleston Crossing |
| Calvert Beach Water | Calvert | Calvert Beach |
| Campus Hills Water Works | Harford | Campus Hills |
| Crystal Water | Cecil | Manchester Park |
| Greenridge Utilities | Harford | Greenridge & Lakeside Vista |
| Maryland American Water | Harford | Bel Air |
| Maryland Water Service | Allegany | Belari-Pinto & Highland Estates |
| Pine Hill Water | Charles | Pine Hill Subdivision |
| Pomonk Utilities | Charles | Indian Head Manor |
| Pomonkey Water | Charles | Ford Heights |
| Provinces Utilities | Anne Arundel | The Provinces |
| Rawlings Heights Water | Allegany | Rawlings Heights |
| Red Hill Water | Charles | Red Hills Estates |
| Severn Water Company | Anne Arundel | Pioneer City–Warfield |
| Steeplechase Waterworks | Wicomico | Steeplechase Subdivision |
| T & C Utility | Cecil | Crystal Beach Manor |
| Tip Hill Water | Charles | Newtown Estates |
| Utilco | Charles | Pomfret Estates |
| Western Shores Water | Calvert | Western Shores |
| White Plains Water | Charles | Kings Manor South |