Water quality for ZIP code 21233
ZIP 21233 covers Baltimore in Baltimore city, Maryland, one of 23 ZIP codes in the county. 14 active public water systems serve the county; 3 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Baltimore city
4 systems, largest first| System | Serves | Status | Rules violated, 3 yr |
|---|---|---|---|
| Johns Hopkins University |
2,058 | 0 | |
| Keswick Multi-Care Center |
575 | 1 | |
| Metropolitan of Baltimore |
414 | 0 | |
| The Neighborhoods at St. Elizabeth |
162 | 4 |
Non-community systems in Baltimore city (9: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Johns Hopkins Hospital |
2,000 | 0 | 0 | |
|
Johns Hopkins Bayview Medical Center |
950 | 0 | 0 | |
|
Mount Washington Pediatric Hospital |
870 | 0 | 0 | |
|
Umd Rehabilitation and Orthopedic Inst. |
860 | 0 | 0 | |
|
University of Maryland Medical Center |
854 | 0 | 0 | |
|
Ummc Midtown Campus Armory Building |
500 | 0 | 0 | |
|
Loch Raven VA Medical Center |
330 | 0 | 0 | |
|
Grace Medical Center |
325 | 0 | 0 | |
|
Manor Care Health Services Roland Park |
216 | 0 | 0 |
About this data
Water systems are matched to Baltimore city, the county this ZIP code lies in, largest first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Maryland records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.