Total Trihalomethanes (TTHM)
Unresolved Total Trihalomethanes Rule violation cited in 2025 (total trihalomethanes (tthm)).
Tennessee · drinking water · SDWIS through latest publish
Obion Water Dept Water Quality — Obion, Tennessee
PWSID TN0000524 · GroundwaterMunicipal
1,615 people served. No health-based SDWIS violations recorded in the past 5 years. 2 remain unresolved. Last cited 1 year ago.
Anomaly engine
Active signals
Haloacetic Acids (HAA5)
Unresolved Total Trihalomethanes Rule violation cited in 2025 (haloacetic acids (haa5)).
Most-cited contaminants
What This Utility Gets Cited For
- Total Trihalomethanes (TTHM)1 citation
- Haloacetic Acids (HAA5)1 citation
Violation history
What's On The SDWIS Record
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 · TOTAL TRIHALOMETHANES (TTHM)
2025 · Total Trihalomethanes (TTHM) · Total Trihalomethanes Rule
Failure to monitor as scheduled
MONITORING · HALOACETIC ACIDS (HAA5)
2025 · Haloacetic Acids (HAA5) · Total Trihalomethanes Rule
Failure to monitor as scheduled
Equity context · ACS 2018-2022 · USEPA-clone EJ disparity
Who Drinks This Water
Obion County, Tennessee (utility's served county per SDWIS GEOGRAPHIC_AREA — city-level not yet matched): a service population of 30,670. Local disparity score for pm2.5 (fine particulate) sits well below the reference (30). Why we surface this →
16.1%
Low-income
19.9%
People of color
6.2%
Under age 5
20.4%
Over age 64
- PM2.5 (fine particulate)Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.23below the national median
- OzoneHealth riskGround-level ozone (smog) inflames the airways. Even short exposures trigger asthma attacks and worsen chronic lung and heart disease.39below the national median
- Nitrogen dioxide (NO₂)Health riskA tailpipe and combustion gas. Concentrates near busy roads and industrial sites; raises risk of airway inflammation, asthma, and lower respiratory infections in children.39below the national median
- Diesel particulateHealth riskSoot from diesel engines (trucks, trains, ports, construction). EPA classifies it as a likely human carcinogen and a major driver of childhood asthma near freight corridors.21below the national median
- Toxic releases (RSEI)Health riskEPA's Risk-Screening Environmental Indicators score — weights TRI chemical releases by toxicity, where they go, and how many people are nearby. Higher means greater modeled cancer and chronic-health risk.44near the national median
- Traffic proximityHealth riskPopulation-weighted distance to high-volume roads. Living close to heavy traffic raises exposure to PM2.5, NO₂, and diesel exhaust — and the cardiovascular and asthma risks that follow.14below the national median
- Lead-paint risk (pre-1960 housing)Health riskShare of housing built before 1960, when lead-based paint was common. Dust from deteriorating paint is the leading cause of childhood lead poisoning, which permanently impairs cognitive development.60above the national median
- Superfund site proximityHealth riskPopulation-weighted distance to NPL Superfund sites — the most contaminated waste sites in the country. Nearby groundwater, soil, and air can carry industrial solvents, metals, and other long-lived contaminants.56near the national median
- RMP-facility proximityHealth riskDistance to facilities holding chemicals at quantities large enough to require an EPA Risk Management Plan (refineries, fertilizer plants, etc.). These pose acute exposure risk during accidental releases.59near the national median
- Hazardous-waste site proximityHealth riskDistance to RCRA hazardous-waste handlers (treatment, storage, disposal facilities). Indicates potential exposure to industrial chemicals in air, soil, and groundwater.14below the national median
- Underground storage tanksHealth riskDensity of underground tanks (gasoline, heating oil, industrial fluids). Leaking tanks are a leading source of benzene and other volatile organic compounds in groundwater drinking-water supplies.44near the national median
- NPDES wastewater proximityHealth riskDistance to permitted industrial wastewater dischargers. Closer proximity raises exposure to pollutants released into surface waters used for fishing, recreation, and downstream drinking-water intakes.56near the national median
- Drinking-water non-complianceHealth riskEPA score for public water systems with health-based Safe Drinking Water Act violations. Higher means more residents on systems that recently exceeded safe limits for contaminants like lead, arsenic, or nitrate.78above the national median
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 30 | well below the reference |
| Ozone | 57 | below the reference |
| Nitrogen dioxide (NO₂) | 52 | below the reference |
| Diesel particulate | 30 | well below the reference |
| Toxic releases (RSEI) | 53 | below the reference |
| Traffic proximity | 20 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 65 | below the reference |
| Superfund site proximity | 0 | well below the reference |
| RMP-facility proximity | 64 | below the reference |
| Hazardous-waste site proximity | 6 | well below the reference |
| Underground storage tanks | 44 | well below the reference |
| NPDES wastewater proximity | 60 | below the reference |
| Drinking-water non-compliance | 30 | 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 2025-01-01 → 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.