Thallium violations in Maryland
5 active public water systems in Maryland had a Thallium violation in the past three years. What Thallium is and why it matters.
Systems with a Thallium violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
ST Johns Lutheran Church and School Baltimore County |
140 | 4 | 0 | |
|
Barrelville Allegany County |
130 | 7 | 2 | |
|
Powrmatic Inc. Carroll County |
35 | 4 | 1 | |
|
Our House Job Training Center for Youth Montgomery County |
30 | 5 | 1 | |
|
Calvert Gateway & McDonalds # 16243 Calvert County |
25 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Thallium, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Thallium alone.
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.