Total Trihalomethanes (TTHM)
Unresolved Total Trihalomethanes Rule violation cited in 2024 (total trihalomethanes (tthm)).
PWSID MS0320013 · GroundwaterMixed
2,162 people served. 1 health-based SDWIS violation recorded in the past 5 years. 6 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
Failure to monitor as scheduled
Failure to monitor as scheduled
OTHER
Failure to monitor as scheduled
Treatment technique violation; returned to compliance
Jefferson County, Mississippi (utility's served county per SDWIS GEOGRAPHIC_AREA — city-level not yet matched): a service population of 7,207. Local disparity score for pm2.5 (fine particulate) sits near the reference (93). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 93 | near the reference |
| Ozone | 23 | well below the reference |
| Nitrogen dioxide (NO₂) | 18 | well below the reference |
| Diesel particulate | 10 | well below the reference |
| Toxic releases (RSEI) | 11 | well below the reference |
| Traffic proximity | 16 | 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 | 0 | well below the reference |
| Hazardous-waste site proximity | 5 | well below the reference |
| Underground storage tanks | 106 | near the reference |
| NPDES wastewater proximity | 14 | well below the reference |
| Drinking-water non-compliance | 265 | 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 2020-01-01 → 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.