Tapcensus

trans-1,2-Dichloroethylene violations in Maryland

2 active public water systems in Maryland had a trans-1,2-Dichloroethylene violation in the past three years. What trans-1,2-Dichloroethylene is and why it matters.

Health effects: Chronic exposure to trans-1,2-dichloroethylene is associated with central nervous system effects in animal studies. EPA has not classified it as a human carcinogen based on available data. Its primary public health significance is as a marker of more acutely toxic parent compounds — TCE, PCE, or vinyl chloride — that may also be present in the same groundwater.

Systems with a trans-1,2-Dichloroethylene violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
ST Johns Lutheran Church and School
Baltimore County 		140 4 0
Powrmatic Inc.
Carroll County 		35 4 1
About this data

A system is counted once if any of its violations in the past three years involved trans-1,2-Dichloroethylene, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not trans-1,2-Dichloroethylene 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.