Total Trihalomethanes (TTHM)
Unresolved Total Trihalomethanes Rule violation cited in 2025 (total trihalomethanes (tthm)).
PWSID TX0210010 · GroundwaterPrivate
150 people served. 33 health-based SDWIS violations recorded in the past 5 years. 13 remain unresolved. Last cited 1 year ago.
Unresolved Total Trihalomethanes Rule violation cited in 2025 (total trihalomethanes (tthm)).
Unresolved Total Trihalomethanes Rule violation cited in 2024 (total trihalomethanes (tthm)).
Unresolved Total Trihalomethanes Rule violation cited in 2024 (total trihalomethanes (tthm)).
Unresolved Total Trihalomethanes Rule violation cited in 2024 (total trihalomethanes (tthm)).
Health-based violations exceed an MCL or treatment-technique standard. Monitoring violations are reporting failures with no measured exceedance — they tell you the system isn't fully transparent, not that the water is unsafe today.
Maximum contaminant level exceeded
Maximum contaminant level exceeded; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded
OTHER; returned to compliance
OTHER; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Brazos County, Texas (utility's served county per SDWIS GEOGRAPHIC_AREA — city-level not yet matched): a service population of 234,548. Local disparity score for pm2.5 (fine particulate) sits near the reference (100). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 100 | near the reference |
| Ozone | 57 | below the reference |
| Nitrogen dioxide (NO₂) | 115 | moderately above the reference |
| Diesel particulate | 68 | below the reference |
| Toxic releases (RSEI) | 28 | well below the reference |
| Traffic proximity | 80 | below the reference |
| Lead-paint risk (pre-1960 housing) | 38 | well below the reference |
| Superfund site proximity | 0 | well below the reference |
| RMP-facility proximity | 132 | moderately above the reference |
| Hazardous-waste site proximity | 53 | below the reference |
| Underground storage tanks | 110 | moderately above the reference |
| NPDES wastewater proximity | 135 | moderately above the reference |
| Drinking-water non-compliance | 1 | well below the reference |
Source: Census ACS 2018-2022 (5-year) + USEPA-clone EJ blockgroup stats (raw indicators + EJ disparity mirror).
Source. EPA Safe Drinking Water Information System · retrieved 2026-05-07. Reporting period 2022-01-01 → 2026-05-07.
What this is not. SDWIS records compliance against federal MCLs — not a direct readout of tap-water concentrations. Active health-based violations are not the same as a current crisis; we link to the EPA record so you can verify return-to-compliance status before forming a conclusion.