4 community water systems serve or are based in ZIP 21401. Showing City Of Annapolis, the largest by reported population served. The other systems are summarized below.
- System name
- City Of Annapolis
- EPA PWS ID
- MD0020001
- Location
- Annapolis, MD
- Population served
- 35,000
- Water source
- Ground water
- Primary EPA source
- EPA ECHO record for MD0020001
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 (Dec. 2023–June 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): 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 2 violations, 0 health-based.
| Type | Rule / contaminant | Since |
|---|---|---|
| Record · other violation | Surface Water Treatment | 2008 |
| Record · missed required testing or reporting | — | 2021 |
Other systems serving or based in ZIP 21401
| System | EPA PWS ID | People served | Violations |
|---|---|---|---|
| Broad Creek | MD0020004 | 26,033 | 4 |
| Mayo Center And Apartments | MD1021462 | 60 | 4 |
| Tenthouse Creek Community - Acds | MD0020063 | 23 | 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.