3 community water systems serve or are based in ZIP 21237. Showing City Of Baltimore, the largest by reported population served. The other systems are summarized below.
- System name
- City Of Baltimore
- EPA PWS ID
- MD0300002
- Location
- Baltimore, MD
- Population served
- 1,600,000
- Water source
- Surface water
- Primary EPA source
- EPA ECHO record for MD0300002
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 (Aug. 2024–May 2025) detected 1 of the 30 monitored chemicals in this system's samples. Highest reported PFPeA result: 3 ppt.
| Chemical | Highest result | EPA legal limit (MCL) | EPA health goal (MCLG) |
|---|---|---|---|
| PFPeA perfluoropentanoic acid | 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 (Jan. 2022–Dec. 2024): 2.7 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 35 violations, 5 health-based.
| Type | Rule / contaminant | Since |
|---|---|---|
| Health-based · treatment-technique violation | Radionuclides | 2009 |
| Record · missed required testing or reporting | — | 2015 |
| Record · missed required testing or reporting | — | 2015 |
| Record · missed required testing or reporting | — | 2015 |
| Record · missed required testing or reporting | — | 2015 |
| Record · missed required testing or reporting | — | 2015 |
| Record · missed required testing or reporting | — | 2015 |
| Record · missed required testing or reporting | — | 2015 |
| Record · missed required testing or reporting | — | 2015 |
| Record · missed required testing or reporting | — | 2015 |
| Record · missed required testing or reporting | — | 2015 |
| Record · missed required testing or reporting | — | 2015 |
Other systems serving or based in ZIP 21237
| System | EPA PWS ID | People served | Violations |
|---|---|---|---|
| Sunnybrook | MD0030011 | 416 | 5 |
| Phoenix | MD0030017 | 31 | 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.