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 |
|---|---|---|---|---|
|
Vista Utilities Chambers County |
90 | 7 | 1 | |
|
City of Toyah Reeves County |
89 | 8 | 1 | |
|
Mullins Mobile Home Park Denton County |
87 | 10 | 4 | |
|
Bridgewood Farms Montgomery County |
85 | 2 | 0 | |
|
Sellers Estates Mobile Home Comm Harris County |
85 | 10 | 4 | |
|
Villa Utilities Harris County |
85 | 8 | 3 | |
|
Frost Mobile Home Park Matagorda County |
84 | 5 | 4 | |
|
Lakeside Water Supply 2 Tyler County |
84 | 9 | 4 | |
|
Walnut Ridge Estates Water System Angelina County |
84 | 4 | 3 | |
|
Capstone Subdivision Burnet County |
81 | 5 | 1 | |
|
Cypress Brook Estates Harris County |
81 | 11 | 6 | |
|
Oak Hill Acres Mobile Home Subdivision Bexar County |
81 | 11 | 4 | |
|
Air Liquide Large Industries US Harris County |
80 | 3 | 0 | |
|
Arrowhead Hill WSC Bell County |
78 | 5 | 0 | |
|
Lakeshore Sites Water Haskell County |
77 | 3 | 1 | |
|
Bandera Electric Cooperative Bandera County |
75 | 1 | 0 | |
|
Blue Ridge Mobile Home Park Kerr County |
75 | 9 | 1 | |
|
Chart House Condominium Tarrant County |
75 | 5 | 2 | |
|
Woodland Shores Subdivision Shelby County |
75 | 13 | 3 | |
|
Bee Hive Homes of Cypress Harris County |
73 | 1 | 0 | |
|
Valley Estates Lubbock County |
68 | 13 | 5 | |
|
Green Lake Estates Water Supply Limestone County |
66 | 11 | 2 | |
|
Sky Harbor Ranchettes Water System Kerr County |
66 | 9 | 1 | |
|
Shady Meadows Mobile Home Park Guadalupe County |
64 | 8 | 1 | |
|
Carol Norra Mobile Home Park Harris County |
63 | 10 | 4 | |
|
Shelby Water Shelby County |
61 | 14 | 4 | |
|
Fall Branch Estates Kerr County |
60 | 8 | 4 | |
|
Houston Suburban Heights MHP Harris County |
60 | 14 | 5 | |
|
Stone Mountain Subdivision Burnet County |
60 | 6 | 0 | |
|
US Border Patrol Station I 35 Webb County |
60 | 5 | 2 | |
|
Driftwood Recovery Hays County |
57 | 3 | 0 | |
|
Geo Specialty Chemicals Harris County |
56 | 6 | 1 | |
|
Country View MHP Lubbock County |
54 | 11 | 4 | |
|
Key Road Subdivision Water System Victoria County |
54 | 8 | 5 | |
|
Los Botines WSC Webb County |
54 | 9 | 3 | |
|
Waring Knoll Subdivision Kendall County |
54 | 11 | 2 | |
|
Cielo Subdivision Montgomery County |
51 | 3 | 1 | |
|
Spring Creek Circle WSC Tarrant County |
51 | 9 | 3 | |
|
Houston County Wcid 1 Houston County |
48 | 3 | 0 | |
|
Ibwc Falcon Village Starr County |
48 | 6 | 2 | |
|
North Park Mobile Home Park Harrison County |
48 | 7 | 2 | |
|
Arrowhead Point San Augustine County |
45 | 5 | 2 | |
|
114th Street Mobile Home Park Lubbock County |
42 | 11 | 5 | |
|
MB Maintenance Harris County |
42 | 1 | 0 | |
|
Tepatitlan Mobile Home Park Harris County |
42 | 5 | 4 | |
|
Twin Buttes Water System Tom Green County |
42 | 3 | 0 | |
|
Enterprise Products Laboratory Chambers County |
40 | 1 | 0 | |
|
Solar Village HOA Kerr County |
40 | 9 | 4 | |
|
Lee Limas Mobile Home Park El Paso County |
39 | 13 | 4 | |
|
Pine Knob Subdivision Montgomery County |
39 | 3 | 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.