Total Trihalomethanes (TTHM)
Unresolved Total Trihalomethanes Rule violation cited in 2024 (total trihalomethanes (tthm)).
PWSID TX1050019 · Purchased / wholesaleMunicipal
34,893 people served. 8 health-based SDWIS violations recorded in the past 5 years. 3 remain unresolved. Last cited 2 years ago.
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)).
Total Trihalomethanes Rule health-based 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; 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
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
Maximum contaminant level exceeded; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled; returned to compliance
Niederwald, Texas (Census place; block-group disparity scores aggregated by centroid containment): a service population of 911. Local disparity score for pm2.5 (fine particulate) sits well above the reference burden (173). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 173 | well above the reference burden |
| Ozone | 103 | near the reference |
| Nitrogen dioxide (NO₂) | 55 | below the reference |
| Diesel particulate | 39 | well below the reference |
| Toxic releases (RSEI) | 23 | well below the reference |
| Traffic proximity | 46 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 43 | well below the reference |
| Superfund site proximity | 0 | well below the reference |
| RMP-facility proximity | 144 | moderately above the reference |
| Hazardous-waste site proximity | 48 | well below the reference |
| Underground storage tanks | 71 | below the reference |
| NPDES wastewater proximity | 130 | moderately above the reference |
| Drinking-water non-compliance | 178 | well above the reference burden |
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.