10 community water systems serve or are based in ZIP 21704. Showing New Design - Frederick County, the largest by reported population served. The other systems are summarized below.
- System name
- New Design - Frederick County
- EPA PWS ID
- MD0100030
- Location
- Frederick, MD
- Population served
- 74,911
- Water source
- Surface water
- Primary EPA source
- EPA ECHO record for MD0100030
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 (Jan. 2025–Oct. 2025) detected 1 of the 30 monitored chemicals in this system's samples. Highest reported PFPeA result: 3.3 ppt.
| Chemical | Highest result | EPA legal limit (MCL) | EPA health goal (MCLG) |
|---|---|---|---|
| PFPeA perfluoropentanoic acid | 3.3 ppt | No federal MCL | — |
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 (July 2019–Dec. 2019): 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 5 violations, 0 health-based.
| Type | Rule / contaminant | Since |
|---|---|---|
| Record · missed required testing or reporting | — | 2023 |
| Record · missed required testing or reporting | — | 2023 |
| Record · missed required testing or reporting | Radium | 2016 |
| Record · missed required testing or reporting | — | 2023 |
| Record · missed required testing or reporting | — | 2023 |
Other systems serving or based in ZIP 21704
| System | EPA PWS ID | People served | Violations |
|---|---|---|---|
| Fountaindale South | MD0100013 | 2,610 | 0 |
| Knolls Of Windsor | MD0100041 | 1,553 | 0 |
| Waterside | MD0100029 | 1,509 | 0 |
| Sam Hill Estates | MD0100040 | 1,036 | 1 |
| Cambridge Farms | MD0100033 | 953 | 0 |
| Cloverhill 3 - Consecutive To Md0100015 | MD0100031 | 888 | 3 |
| Copperfield | MD0100037 | 338 | 0 |
| Country Meadows Of Frederick | MD0100047 | 295 | 7 |
| White Rock | MD0100026 | 256 | 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 UCMR 5 final dataset · EPA SDWIS lead & copper 90th-percentile results. EPA data can lag the latest tests.