TTHM (Total Trihalomethanes) violations in District of Columbia
3 active public water systems in District of Columbia had a TTHM (Total Trihalomethanes) violation in the past three years. What TTHM (Total Trihalomethanes) is and why it matters.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Joint Base Anacostia Bolling District of Columbia County |
20,411 | 7 | 1 | |
|
Naval Station Washington Wny District of Columbia County |
16,800 | 4 | 0 | |
|
Lake Valley Navajo School Bie Lake Valley Boarding School · County |
60 | 5 | 3 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) 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 District of Columbia 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.