3 community water systems serve or are based in ZIP 21001. Showing Harford County D.P.W., the largest by reported population served. The other systems are summarized below.
- System name
- Harford County D.P.W.
- EPA PWS ID
- MD0120016
- Location
- Abingdon, MD
- Population served
- 104,567
- Water source
- Surface water
- Primary EPA source
- EPA ECHO record for MD0120016
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 (June 2023–Mar. 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 4 violations, 0 health-based.
| Type | Rule / contaminant | Since |
|---|---|---|
| Record · missed required testing or reporting | Total Trihalomethanes (TTHM) | 2024 |
| Record · missed required testing or reporting | Haloacetic Acids (HAA5) | 2024 |
| Record · missed required testing or reporting | Lead & Copper Rule | 2011 |
| Record · missed required testing or reporting | Nitrate | 2022 |
Other systems serving or based in ZIP 21001
| System | EPA PWS ID | People served | Violations |
|---|---|---|---|
| City Of Aberdeen | MD0120001 | 18,006 | 2 |
| Chapel Hill - Aberdeen Proving Grounds | MD0120002 | 15,000 | 2 |
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.