County · Maryland
Frederick County, Maryland: drinking water records
This overview covers 27 ZIP codes and 30 community water systems in Frederick County. It also stands in for 5 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 |
|---|---|---|---|---|---|
| Fort Detrick MD0100011 | 7,900 | 120 | 1 | 2 | 0 ppb |
| New Design - Frederick County MD0100030 | 74,911 | 120 | 1 | 0 | 3 ppb |
| City of Frederick MD0100015 | 54,000 | 480 | 1 | 0 | 1.1 ppb |
| Town of Walkersville MD0100025 | 8,440 | 120 | 0 | 0 | 0 ppb |
| City of Brunswick MD0100005 | 7,312 | 240 | 0 | 0 | 0 ppb |
| Town of Thurmont MD0100023 | 6,200 | 240 | 4 | 0 | 4 ppb |
| Town of Middletown MD0100018 | 4,288 | 180 | 8 | 0 | 2 ppb |
| Cloverhill 3 - Consecutive To MD0100015 MD0100031 | 888 | 0 | 0 | 3 | 0 ppb |
| Gilberts Mobile Home Park MD0100207 | 75 | 0 | 0 | 1 | 0 ppb |
| Amelano Manor MD0100001 | 36 | 0 | 0 | 1 | 0 ppb |
| Town of Emmitsburg MD0100010 | 2,921 | 0 | 0 | 0 | 0 ppb |
| Fountaindale South MD0100013 | 2,610 | 0 | 0 | 0 | 1 ppb |
| Mount Saint Marys University MD0100019 | 1,900 | 0 | 0 | 0 | 0 ppb |
| Knolls of Windsor MD0100041 | 1,553 | 0 | 0 | 0 | 0 ppb |
| Town of Myersville MD0100020 | 1,516 | 0 | 0 | 0 | 2.4 ppb |
| Waterside MD0100029 | 1,509 | 0 | 0 | 0 | 0 ppb |
| Sam Hill Estates MD0100040 | 1,036 | 0 | 0 | 0 | 1.7 ppb |
| Cambridge Farms MD0100033 | 953 | 0 | 0 | 0 | 1 ppb |
| Town of Woodsboro MD0100027 | 846 | 0 | 0 | 0 | 13 ppb |
| Copperfield MD0100037 | 338 | 0 | 0 | 0 | 1 ppb |
| Country Meadows of Frederick MD0100047 | 295 | 0 | 0 | 0 | 0 ppb |
| White Rock MD0100026 | 256 | 0 | 0 | 0 | 0 ppb |
| Bradford Estates MD0100032 | 178 | 0 | 0 | 0 | 0 ppb |
| Concord Estates Mobile Home Park MD0100203 | 150 | 0 | 0 | 0 | 0 ppb |
| Libertytown East MD0100038 | 140 | 0 | 0 | 0 | 4 ppb |
ZIP reports in Frederick 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: 21718, 21762, 21778, 21780, 21790.
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.