10 community water systems serve or are based in ZIP 21550. Showing Deep Creek Lake Water Service Area, the largest by reported population served. The other systems are summarized below.
- System name
- Deep Creek Lake Water Service Area
- EPA PWS ID
- MD1111096
- Location
- Mountain Lake Park, MD
- Population served
- 5,502
- Water source
- Ground water
- Primary EPA source
- EPA ECHO record for MD1111096
Make sure this is the system tied to your address before using these results to make a decision about your own water. A ZIP code is not a street address.
EPA lab monitoring (UCMR 5)
EPA has no UCMR 5 (PFAS and lithium) monitoring results on file for this system.
UCMR 5 results are monitoring data, not a compliance determination. PFAS compliance is governed by separate EPA drinking-water rules. Some PFAS rule changes are proposed for 2026 — see what's proposed.
Lead at customer taps
Lead at sampled customer taps, 90th percentile (Jan. 2025–Dec. 2025): 6.3 ppb. EPA's current action level is 15 ppb; its health goal (MCLG) is 0.
Lead is regulated with an action level rather than a standard MCL. EPA's lead action level is 15 ppb today; the Lead and Copper Rule Improvements lower it to 10 ppb starting Nov. 1, 2027.
Violations on the federal record
The EPA record shows 1 violation, 0 health-based.
| Type | Rule / contaminant | Since |
|---|---|---|
| Record · other violation | Surface Water Treatment | 2008 |
Other systems serving or based in ZIP 21550
| System | EPA PWS ID | People served | Violations |
|---|---|---|---|
| Town Of Mountain Lake Park | MD0110007 | 3,000 | 4 |
| Town Of Oakland | MD0110008 | 1,850 | 3 |
| Town Of Friendsville | MD0110004 | 622 | 4 |
| Town Of Kitzmiller | MD0110013 | 370 | 1 |
| Bloomington | MD0110002 | 350 | 2 |
| Town Of Deer Park | MD0110021 | 272 | 3 |
| Crellin | MD0110003 | 230 | 2 |
| Gorman | MD0110012 | 150 | 1 |
| Keysers Ridge | MD0110025 | 63 | 0 |
On a private well? EPA public-system data does not describe your individual well. Test your water directly.
What the numbers mean
EPA uses two different benchmarks: the legal limit (MCL) and the health goal (MCLG). They are not always the same number. Read EPA's explanation →
Open the interactive report →What the government says
Sources: U.S. EPA SDWIS (system record and violations, queried live) · EPA SDWIS lead & copper 90th-percentile results. EPA data can lag the latest tests.