Total Trihalomethanes (TTHM)
Unresolved Total Trihalomethanes Rule violation cited in 2024 (total trihalomethanes (tthm)).
PWSID MS0250001 · GroundwaterMunicipal
640 people served. No health-based SDWIS violations recorded in the past 5 years. 8 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 (haloacetic acids (haa5)).
Unresolved Total Trihalomethanes Rule violation cited in 2024 (haloacetic acids (haa5)).
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.
Failure to monitor as scheduled
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled
Hinds County, Mississippi (utility's served county per SDWIS GEOGRAPHIC_AREA — city-level not yet matched): a service population of 226,541. Local disparity score for pm2.5 (fine particulate) sits well above the reference burden (193). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 193 | well above the reference burden |
| Ozone | 36 | well below the reference |
| Nitrogen dioxide (NO₂) | 105 | near the reference |
| Diesel particulate | 95 | near the reference |
| Toxic releases (RSEI) | 65 | below the reference |
| Traffic proximity | 121 | moderately above the reference |
| Lead-paint risk (pre-1960 housing) | 107 | near the reference |
| Superfund site proximity | 78 | below the reference |
| RMP-facility proximity | 173 | well above the reference burden |
| Hazardous-waste site proximity | 93 | near the reference |
| Underground storage tanks | 165 | well above the reference burden |
| NPDES wastewater proximity | 92 | near the reference |
| Drinking-water non-compliance | 203 | severely 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 2023-01-01 → 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.