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 |
|---|---|---|---|---|
|
Oaks at Houston Point Chambers County |
165 | 2 | 0 | |
|
South Midland County Water System Midland County |
165 | 10 | 4 | |
|
Woodland Estates Bowie County |
165 | 12 | 5 | |
|
Denton Estates Mobile Home Park Denton County |
156 | 12 | 5 | |
|
Target Hospitality Orla North Lodge Reeves County |
151 | 4 | 0 | |
|
FW Murphy Water System Fort Bend County |
150 | 2 | 0 | |
|
Lake Livingston Heights WSC Walker County |
150 | 3 | 1 | |
|
New Wine Chapel Fort Bend County |
150 | 9 | 2 | |
|
Park Six West Harris County |
150 | 7 | 2 | |
|
Titan Production Equipment Colorado County |
150 | 4 | 2 | |
|
Country Lakes Water Supply Panola County |
144 | 6 | 3 | |
|
Timber Ridge Section 2 Chambers County |
141 | 2 | 0 | |
|
Turtle Cove Lot Owners Assoc Brazoria County |
141 | 2 | 0 | |
|
Skywater WSC Castro County |
140 | 9 | 6 | |
|
Travis Body and Trailer Harris County |
137 | 6 | 3 | |
|
Cattail Creek MHP Erath County |
135 | 7 | 1 | |
|
Deep River Plantation Walker County |
135 | 1 | 0 | |
|
Lakeside Water Supply 5 Tyler County |
135 | 9 | 4 | |
|
Bay Place Subdivision the Chambers County |
132 | 2 | 1 | |
|
Havenwood Nature School Hays County |
130 | 4 | 0 | |
|
Equestrian Estates Erath County |
129 | 5 | 1 | |
|
Esquire Estates II Henderson County |
126 | 5 | 2 | |
|
Harris County Leadership Academy Harris County |
125 | 6 | 1 | |
|
Thalia WSC Foard County |
125 | 1 | 0 | |
|
Hamilton Estates Water System Harris County |
123 | 12 | 5 | |
|
Lakeside Water Supply 3 Tyler County |
123 | 7 | 4 | |
|
Lakeside Water Supply 4 Tyler County |
123 | 8 | 4 | |
|
Binford Place Subdivision Harris County |
120 | 10 | 2 | |
|
Maryam Islamic Center at New Territory Fort Bend County |
120 | 2 | 1 | |
|
Sagerton WSC Haskell County |
120 | 3 | 1 | |
|
City of Marietta Cass County |
115 | 2 | 0 | |
|
Catalpa Villa Randall County |
114 | 13 | 4 | |
|
Miralomas MUD Kendall County |
113 | 2 | 0 | |
|
Tara Park Water System Waller County |
113 | 13 | 4 | |
|
Diversitech Colorado County |
110 | 2 | 0 | |
|
Pleasure Point Angelina County |
110 | 12 | 3 | |
|
Spring Creek Athletics Harris County |
110 | 6 | 1 | |
|
Gateway Development Hays County |
108 | 1 | 0 | |
|
Whispering Pines Lake Water Walker County |
108 | 10 | 2 | |
|
Pine Oak Forest Water Harris County |
105 | 12 | 2 | |
|
Shady Creek Section 3 Water System Brazoria County |
105 | 7 | 1 | |
|
Big Thicket RV Park Hardin County |
102 | 6 | 3 | |
|
Computer Kids Preschool Harris County |
100 | 9 | 0 | |
|
Harvest Family Church of the Assemblies Harris County |
100 | 6 | 1 | |
|
Ineo Bayport EO Plant Line 2 Harris County |
100 | 1 | 0 | |
|
Little Lions Learning Academy Bexar County |
100 | 12 | 4 | |
|
Reed Estates Water System Harris County |
96 | 8 | 2 | |
|
Bluebonnet Mobile Home Park Harris County |
93 | 6 | 1 | |
|
Gurudwara Sahib of Houston Harris County |
90 | 8 | 1 | |
|
Silverwoods Subdivision Harris County |
90 | 11 | 5 |
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.