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 |
|---|---|---|---|---|
|
City of Georgetown Williamson County |
191,639 | 3 | 0 | |
|
Clwsc Canyon Lake Shores Comal County |
44,196 | 6 | 0 | |
|
Manville WSC Travis County |
39,648 | 3 | 1 | |
|
Sjwtx Triple Peak Plant Comal County |
32,973 | 2 | 0 | |
|
City of Big Spring Howard County |
27,282 | 4 | 0 | |
|
Military Hwy WSC las Rusias Hidalgo County |
17,943 | 2 | 1 | |
|
Orange County Wcid 1 Orange County |
15,258 | 2 | 1 | |
|
City of Henderson Rusk County |
14,666 | 5 | 0 | |
|
Nueces County Wcid 3 Nueces County |
14,000 | 3 | 0 | |
|
City of Port Lavaca Calhoun County |
12,000 | 4 | 1 | |
|
City of la Grulla Starr County |
11,250 | 7 | 6 | |
|
Hudson WSC Angelina County |
10,907 | 4 | 0 | |
|
Webb County Water Utilities Webb County |
8,358 | 4 | 2 | |
|
Fouke WSC Wood County |
7,668 | 1 | 0 | |
|
City of Gladewater Gregg County |
6,441 | 7 | 2 | |
|
City of Childress Childress County |
6,105 | 5 | 3 | |
|
City of McGregor McLennan County |
6,037 | 6 | 2 | |
|
City of Diboll Angelina County |
5,207 | 7 | 0 | |
|
Coleman County SUD Coleman County |
5,000 | 6 | 3 | |
|
Gbra Calhoun County Rural Water System Calhoun County |
4,482 | 4 | 2 | |
|
Rayburn Country MUD Jasper County |
4,062 | 6 | 2 | |
|
Millersview Doole WSC Concho County |
3,987 | 5 | 2 | |
|
West Wise SUD Wise County |
3,909 | 3 | 1 | |
|
City of Emory Rains County |
3,762 | 3 | 0 | |
|
Callahan County WSC Callahan County |
3,741 | 2 | 0 | |
|
Somervell County Water District Somervell County |
3,666 | 2 | 0 | |
|
Multi-County WSC Coryell County |
3,631 | 3 | 0 | |
|
South Rains SUD Rains County |
3,594 | 3 | 1 | |
|
Redland WSC Angelina County |
3,354 | 1 | 0 | |
|
Fort Griffin SUD Shackelford County |
3,300 | 6 | 2 | |
|
City of Blanco Blanco County |
3,192 | 4 | 2 | |
|
City of la Joya Hidalgo County |
3,033 | 7 | 5 | |
|
Sjwtx Glenwood Subdivision Comal County |
2,985 | 3 | 0 | |
|
Caney Creek MUD of Matagorda County Matagorda County |
2,764 | 3 | 0 | |
|
City of Junction Kimble County |
2,700 | 6 | 3 | |
|
River Acres WSC Nueces County |
2,700 | 2 | 1 | |
|
City of East Tawakoni Rains County |
2,686 | 7 | 1 | |
|
Eastern Cass WSC Cass County |
2,670 | 5 | 1 | |
|
City of Quanah Hardeman County |
2,662 | 6 | 2 | |
|
Gill WSC Harrison County |
2,640 | 1 | 1 | |
|
City of West McLennan County |
2,597 | 3 | 3 | |
|
City of Runaway Bay Wise County |
2,458 | 9 | 1 | |
|
City of Overton Rusk County |
2,275 | 5 | 2 | |
|
Westwood Shores MUD Trinity County |
2,125 | 3 | 0 | |
|
Wright City WSC 2 Smith County |
2,124 | 4 | 1 | |
|
Starrville Friendship WSC Smith County |
2,121 | 1 | 0 | |
|
City of West Tawakoni Hunt County |
2,061 | 8 | 5 | |
|
City of Clarendon Donley County |
2,026 | 1 | 0 | |
|
City of Rotan Fisher County |
1,983 | 7 | 5 | |
|
Comanche Harbor & Port Ocall Hood County |
1,764 | 3 | 2 |
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.