TTHM (Total Trihalomethanes) violations in Texas
514 active public water systems in Texas had a TTHM (Total Trihalomethanes) violation in the past three years, 157 of them in the latest quarter of EPA's data. 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 |
|---|---|---|---|---|
|
Maverick Resources Andrews County |
38 | 4 | 0 | |
|
200 County Road 314 Williamson County |
37 | 7 | 1 | |
|
Rayburn Water Resources Jasper County |
37 | 7 | 1 | |
|
City of Dayton Lakes Liberty County |
36 | 11 | 4 | |
|
Heavens Mobile Home Park Kerr County |
36 | 3 | 1 | |
|
Blue Compass RV South Houston Brazoria County |
35 | 7 | 1 | |
|
Shafter Mine Presidio County |
32 | 13 | 4 | |
|
Devon Energy-Cuero TX Field Office DeWitt County |
30 | 4 | 0 | |
|
Memory Lane MHP Guadalupe County |
30 | 7 | 4 | |
|
Endurance Lift Solutions Midland Midland County |
25 | 7 | 1 | |
|
Fere Investments Benitez Property Harris County |
25 | 1 | 0 | |
|
Iuoe Training Facility Liberty County |
25 | 3 | 1 | |
|
Linde la Porte Harris County |
25 | 1 | 0 | |
|
Tdcj Buffalo Ranch Burleson County |
25 | 4 | 0 |
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 Texas 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.