County · Maryland
Caroline County, Maryland: drinking water records
This overview covers 8 ZIP codes and 17 community water systems in Caroline County. It also stands in for 2 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Town of Denton MD0050001 | 4,500 | 180 | 0 | 0 | 0 ppb |
| Town of Preston MD0050005 | 750 | 0 | 0 | 1 | 0 ppb |
| Caroline Acres Mobile Home Park MD0050204 | 395 | 0 | 0 | 1 | 0 ppb |
| Benedictine School MD0050201 | 300 | 0 | 0 | 2 | 0 ppb |
| Cedar Mobile Home Park MD0050205 | 300 | 0 | 0 | 2 | 0 ppb |
| Irish Creek MHP PA3060113 | 90 | 0 | 0 | 3 | 18 ppb |
| Holly Cove Harbor Mobile Home Park MD0050206 | 45 | 0 | 0 | 3 | 0 ppb |
| Liberty Mobile Home Park MD0050207 | 40 | 0 | 0 | 4 | 0 ppb |
| Tower Court Mobile Home Park MD0050216 | 40 | 0 | 0 | 1 | 0 ppb |
| Taylors Mobile Home Park MD0050217 | 27 | 0 | 0 | 1 | 0 ppb |
| Town of Federalsburg MD0050002 | 2,450 | 0 | 0 | 0 | 2.5 ppb |
| Town of Greensboro MD0050003 | 1,878 | 0 | 0 | 0 | 0 ppb |
| Town of Ridgely MD0050006 | 1,600 | 0 | 0 | 0 | 0 ppb |
| Town of Henderson MD0050008 | 156 | 0 | 0 | 0 | 0 ppb |
| Jonestown Water System MD0050004 | 150 | 0 | 0 | 0 | 0 ppb |
| Nelpine Mobile Home Park MD0050210 | 70 | 0 | 0 | 0 | 0 ppb |
| Nielsen Mobile Home Park [marsh Creek] MD0050218 | 35 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Caroline County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 21636, 21641.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.