Haloacetic Acids (HAA5)
Unresolved Total Trihalomethanes Rule violation cited in 2025 (haloacetic acids (haa5)).
PWSID MS0250012 · GroundwaterMunicipal
28,098 people served. 21 health-based SDWIS violations recorded in the past 5 years. 21 remain unresolved. Last cited 1 year ago.
Unresolved Total Trihalomethanes Rule violation cited in 2025 (haloacetic acids (haa5)).
Unresolved Total Trihalomethanes Rule violation cited in 2025 (haloacetic acids (haa5)).
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
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Treatment technique violation
Treatment technique violation
Treatment technique violation
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
OTHER; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Treatment technique violation
Treatment technique violation
Treatment technique violation
Jackson, Mississippi (Census place; block-group disparity scores aggregated by centroid containment): a service population of 153,271. Local disparity score for pm2.5 (fine particulate) sits severely above the reference burden (222). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 222 | severely above the reference burden |
| Ozone | 42 | well below the reference |
| Nitrogen dioxide (NO₂) | 136 | moderately above the reference |
| Diesel particulate | 124 | moderately above the reference |
| Toxic releases (RSEI) | 73 | below the reference |
| Traffic proximity | 157 | well above the reference burden |
| Lead-paint risk (pre-1960 housing) | 136 | moderately above the reference |
| Superfund site proximity | 117 | moderately above the reference |
| RMP-facility proximity | 210 | severely above the reference burden |
| Hazardous-waste site proximity | 122 | moderately above the reference |
| Underground storage tanks | 205 | severely above the reference burden |
| NPDES wastewater proximity | 113 | moderately above the reference |
| Drinking-water non-compliance | 254 | 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.