We found 20 public water systems that could serve the same population as Parkers Creek Knolls (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Calvert High School - See 0040011 | Prince Frederick | 1,450 | 0 | 0 |
| Chesapeake Heights (bayside Forest) | Prince Frederick | 809 | 12 | 6 |
| Calvert Career Center - See 0040011 | Prince Frederick | 800 | 0 | 0 |
| Calvert Middle School | Prince Frederick | 675 | 0 | 0 |
| Greater Mt Zion Baptist Church - 1041256 | Prince Frederick | 200 | 0 | 0 |
| Calvert County Jail - See 0040011 | Prince Frederick | 150 | 0 | 0 |
| Woodbridge - Mason Road- Served 0040011 | Prince Frederick | 100 | 0 | 0 |
| Southern Pines Elderly House-see 0040027 | Prince Frederick | 93 | 0 | 0 |
| Miss Tina Day Care | Prince Frederick | 40 | 0 | 0 |
| Bayside Chevrolet Buick Toyota | Prince Frederick | 34 | 0 | 0 |
| Mt Olive Um Church | Prince Frederick | 25 | 0 | 0 |
| Bridge Diner | Prince Frederick | 25 | 0 | 0 |
| Route 231 Citgo | Prince Frederick | 25 | 0 | 0 |
| Hallowing Point Park Maintenance Bldg | Prince Frederick | 25 | 0 | 0 |
| Cove Point Park Maintenance Bldg | Prince Frederick | 25 | 0 | 0 |
| Double D's Sports | Prince Frederick | 10 | 0 | 0 |
| Matteson Supply Company | Prince Frederick | 2 | 0 | 0 |
| Flag Harbor Pool | Prince Frederick | 0 | 0 | 0 |
| Solomons Wastewater Treatment Plant | Prince Frederick | 0 | 0 | 0 |
| Hallowing Point Trailer Park | Prince Frederick | 0 | 0 | 0 |