Total Trihalomethanes (TTHM)
Unresolved Total Trihalomethanes Rule violation cited in 2021 (total trihalomethanes (tthm)).
PWSID FL3354883 · GroundwaterMixed
24,798 people served. 28 health-based SDWIS violations recorded in the past 5 years. 10 remain unresolved. Last cited 4 years ago.
Unresolved Total Trihalomethanes Rule violation cited in 2021 (total trihalomethanes (tthm)).
Unresolved Total Trihalomethanes Rule violation cited in 2021 (haloacetic acids (haa5)).
Unresolved Total Trihalomethanes Rule violation cited in 2021 (haloacetic acids (haa5)).
Unresolved Total Trihalomethanes Rule violation cited in 2021 (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.
Monitoring failure; returned to compliance
Monitoring failure; returned to compliance
Monitoring failure; 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
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
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
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; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Altamonte Springs, Florida (Census place; block-group disparity scores aggregated by centroid containment): a service population of 45,772. 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 | 19 | well below the reference |
| Nitrogen dioxide (NO₂) | 129 | moderately above the reference |
| Diesel particulate | 129 | moderately above the reference |
| Toxic releases (RSEI) | 116 | moderately above the reference |
| Traffic proximity | 105 | near the reference |
| Lead-paint risk (pre-1960 housing) | 34 | well below the reference |
| Superfund site proximity | 118 | moderately above the reference |
| RMP-facility proximity | 88 | below the reference |
| Hazardous-waste site proximity | 62 | below the reference |
| Underground storage tanks | 99 | near the reference |
| NPDES wastewater proximity | 13 | well below the reference |
| Drinking-water non-compliance | 18 | 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 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.