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 |
|---|---|---|---|---|
|
Town of Indian Lake Cameron County |
888 | 2 | 0 | |
|
City of Zavalla Angelina County |
880 | 8 | 5 | |
|
Mount Houston Square Harris County |
836 | 1 | 0 | |
|
Lakeway Harbor Subdivision Smith County |
831 | 2 | 1 | |
|
Road Ranger 270 Frio County |
830 | 7 | 2 | |
|
Fulbrook Subdivision Water Plant Fort Bend County |
807 | 6 | 0 | |
|
Bethel Ash WSC Walton Plant Henderson County |
801 | 1 | 0 | |
|
City of Coolidge Limestone County |
786 | 4 | 2 | |
|
Cypress Valley WSC Plant 1 Harrison County |
771 | 6 | 3 | |
|
Sportsmans World MUD Palo Pinto County |
735 | 3 | 1 | |
|
City of Throckmorton Throckmorton County |
728 | 2 | 1 | |
|
Big Oak MHP Harrison County |
726 | 1 | 0 | |
|
C R C WSC Henderson County |
723 | 3 | 0 | |
|
Ascend Performance Materials Chocolate B Brazoria County |
700 | 1 | 0 | |
|
Iola Isd Grimes County |
700 | 4 | 1 | |
|
D P & R WSC Fisher County |
699 | 6 | 4 | |
|
Live Oak Water System Hill County |
696 | 3 | 0 | |
|
City of Cumby Hopkins County |
685 | 7 | 2 | |
|
Ucc Seadrift Operations Calhoun County |
683 | 1 | 0 | |
|
Harris County Fwsd 1b Harris County |
672 | 5 | 2 | |
|
City of Reklaw Cherokee County |
660 | 1 | 0 | |
|
Galveston County Wcid 19 Galveston County |
660 | 2 | 0 | |
|
Buena Vista WSC Shelby County |
647 | 4 | 0 | |
|
Promiseland Church San Marcos Hays County |
625 | 3 | 1 | |
|
Tidwell Forest New Subdivision Harris County |
624 | 6 | 0 | |
|
Beulah WSC Angelina County |
618 | 5 | 1 | |
|
Carefree Valley Resort Cameron County |
600 | 3 | 1 | |
|
Benchley Oaks Subdivision Brazos County |
567 | 2 | 0 | |
|
Green Creek WSC Erath County |
555 | 5 | 1 | |
|
Rowena WSC Runnels County |
528 | 5 | 1 | |
|
New Prospect WSC Plant 2 & 3 Rusk County |
501 | 3 | 1 | |
|
Yegua Water System Burleson County |
487 | 4 | 2 | |
|
South Meadows West Brazoria County |
477 | 3 | 1 | |
|
Firefly Water System Gillespie County |
464 | 1 | 0 | |
|
Woodland Harbor Camp County |
459 | 3 | 1 | |
|
Pine Colony Mobile Home Park Brazoria County |
450 | 11 | 4 | |
|
Rocky Point Estates Grayson County |
441 | 2 | 1 | |
|
Bracken Village Comal County |
440 | 8 | 1 | |
|
Inverness Point Water System Travis County |
435 | 2 | 1 | |
|
Schlumberger Rosharon Campus Brazoria County |
435 | 2 | 1 | |
|
Buchanan Lake Village Llano County |
425 | 11 | 3 | |
|
Holiday Inn Harris County |
425 | 6 | 0 | |
|
Corpus Christi Liquefaction San Patricio County |
400 | 2 | 0 | |
|
Doucette Water System Tyler County |
399 | 9 | 2 | |
|
Target Hospitality Delaware Lodge Reeves County |
391 | 5 | 0 | |
|
Bright Star Salem SUD 2 Rains County |
378 | 4 | 1 | |
|
Willow Manor Mobile Home Park Brazoria County |
375 | 2 | 0 | |
|
Lakeside Estates Subdivision Waller County |
366 | 12 | 6 | |
|
Goodsprings WSC Plant C Rusk County |
363 | 3 | 1 | |
|
Staff WSC Lacasa Area Eastland County |
348 | 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.