County · Maryland
Baltimore County, Maryland: drinking water records
This overview covers 44 ZIP codes and 13 community water systems in Baltimore County. It also stands in for 7 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 |
|---|---|---|---|---|---|
| Delmar Utility Comm (Tn of Delmar) DE0000567 | 2,027 | 60 | 0 | 0 | 2 ppb |
| Swann Keys DE0000465 | 1,764 | 60 | 0 | 0 | 3.2 ppb |
| Glen Meadows Retirement Community MD0030208 | 468 | 0 | 0 | 1 | 0 ppb |
| Chapel Hill Nursing Center MD0030202 | 125 | 0 | 0 | 2 | 2 ppb |
| Gramercy LLC (Aka Koinonia Partnership ) MD0030023 | 40 | 0 | 0 | 1 | 8 ppb |
| Stella Maris MD0030212 | 873 | 0 | 0 | 0 | 0 ppb |
| Sunnybrook MD0030011 | 416 | 0 | 0 | 0 | 3 ppb |
| Enchanted Acres MHC LLC DE0000259 | 225 | 0 | 0 | 0 | 0 ppb |
| Holly Oak Mobile Home Park DE0000568 | 210 | 0 | 0 | 0 | 0 ppb |
| Dogwood Manor Mobile Home Park MI0040008 | 190 | 0 | 0 | 0 | 0 ppb |
| Dove Estates DE0000112 | 111 | 0 | 0 | 0 | 0 ppb |
| Granite Mobile Home Park MD0030204 | 96 | 0 | 0 | 0 | 4.4 ppb |
| Phoenix MD0030017 | 31 | 0 | 0 | 0 | 2 ppb |
ZIP reports in Baltimore 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: 21023, 21053, 21105, 21111, 21120, 21152, 21155.
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.