7 community water systems serve or are based in ZIP 21620. Showing Town Of Chestertown, the largest by reported population served. The other systems are summarized below.
- System name
- Town Of Chestertown
- EPA PWS ID
- MD0140002
- Location
- Chestertown, MD
- Population served
- 5,400
- Water source
- Ground water
- Primary EPA source
- EPA ECHO record for MD0140002
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 (Apr. 2025–Oct. 2025) 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): 1.2 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 10 violations, 1 health-based.
| Type | Rule / contaminant | Since |
|---|---|---|
| Record · missed required testing or reporting | — | 2008 |
| Record · other violation | Surface Water Treatment | 2007 |
| Record · other violation | Surface Water Treatment | 2008 |
| Record · missed required testing or reporting | Lead & Copper Rule | 2008 |
| Record · missed required testing or reporting | Lead & Copper Rule | 2014 |
| Record · other violation | Surface Water Treatment | 2015 |
| Record · other violation | Surface Water Treatment | 2018 |
| Record · missed required testing or reporting | Lead & Copper Rule | 2020 |
| Health-based · treatment-technique violation | Ground Water Rule | 2024 |
| Record · late or missing report | Ground Water Rule | 2024 |
Other systems serving or based in ZIP 21620
| System | EPA PWS ID | People served | Violations |
|---|---|---|---|
| Worton | MD0140007 | 955 | 2 |
| Fairlee | MD0140003 | 725 | 2 |
| Town Of Galena | MD0140004 | 560 | 2 |
| Kennedyville | MD0140005 | 300 | 2 |
| Edesville | MD0140009 | 296 | 3 |
| Millington Distribution System | MD0140012 | 260 | 1 |
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.