10 community water systems serve or are based in ZIP 20678. Showing Prince Frederick, the largest by reported population served. The other systems are summarized below.
- System name
- Prince Frederick
- EPA PWS ID
- MD0040011
- Location
- Prince Frederick, MD
- Population served
- 4,371
- Water source
- Ground water
- Primary EPA source
- EPA ECHO record for MD0040011
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 UCMR 5 monitoring (Feb. 2024–Aug. 2024) checked this system for 30 chemicals (29 PFAS and lithium) and detected none above EPA's minimum reporting levels.
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. 2021–Dec. 2023): 0 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 5 violations, 0 health-based.
| Type | Rule / contaminant | Since |
|---|---|---|
| Record · missed required testing or reporting | — | 2010 |
| Record · other violation | Surface Water Treatment | 2008 |
| Record · missed required testing or reporting | Lead & Copper Rule | 2014 |
| Record · missed required testing or reporting | Lead & Copper Rule | 2011 |
| Record · missed required testing or reporting | — | 2024 |
Other systems serving or based in ZIP 20678
| System | EPA PWS ID | People served | Violations |
|---|---|---|---|
| Solomons | MD0040027 | 3,811 | 4 |
| Chesapeake Heights (Bayside Forest) | MD0040018 | 1,190 | 4 |
| Summit/Highlands | MD0040026 | 1,108 | 3 |
| Cross Point Subdivision | MD0040052 | 434 | 3 |
| Cavalier Country | MD0040002 | 381 | 3 |
| Shores Of Calvert | MD0040015 | 361 | 3 |
| St. Leonard | MD0040013 | 350 | 3 |
| Kenwood Beach | MD0040007 | 338 | 3 |
| Marley Run | MD0040053 | 290 | 3 |
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 UCMR 5 final dataset · EPA SDWIS lead & copper 90th-percentile results. EPA data can lag the latest tests.