Total Trihalomethanes (TTHM)
Unresolved Total Trihalomethanes Rule violation cited in 2023 (total trihalomethanes (tthm)).
PWSID OR4105940 · GroundwaterPrivate
20 people served. 3 health-based SDWIS violations recorded in the past 5 years. 3 remain unresolved. Last cited 1 year ago.
Unresolved Total Trihalomethanes Rule violation cited in 2023 (total trihalomethanes (tthm)).
Unresolved Total Trihalomethanes Rule violation cited in 2023 (haloacetic acids (haa5)).
Unresolved Revised Total Coliform Rule violation cited in 2022 (contaminant 8000).
Revised Total Coliform Rule health-based violation cited in 2022 (contaminant 8000).
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; returned to compliance
Failure to monitor as scheduled; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled; returned to compliance
Maximum contaminant level exceeded; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded; returned to compliance
Newberg, Oregon (Census place; block-group disparity scores aggregated by centroid containment): a service population of 25,379. Local disparity score for pm2.5 (fine particulate) sits near the reference (97). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 97 | near the reference |
| Ozone | 5 | well below the reference |
| Nitrogen dioxide (NO₂) | 36 | well below the reference |
| Diesel particulate | 49 | well below the reference |
| Toxic releases (RSEI) | 51 | below the reference |
| Traffic proximity | 46 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 53 | below the reference |
| Superfund site proximity | 0 | well below the reference |
| RMP-facility proximity | 1 | well below the reference |
| Hazardous-waste site proximity | 37 | well below the reference |
| Underground storage tanks | 68 | below the reference |
| NPDES wastewater proximity | 35 | well below the reference |
| Drinking-water non-compliance | 0 | 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 2022-01-01 → 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.