Contaminant 5200
Phase I/II/V Inorganic Chemical Rules health-based violation cited in 2024 (contaminant 5200).
PWSID NM3501921 · GroundwaterMunicipal
12,012 people served. 1 health-based SDWIS violation recorded in the past 5 years. Last cited 2 years ago.
Phase I/II/V Inorganic Chemical Rules health-based violation cited in 2024 (contaminant 5200).
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.
OTHER; returned to compliance
Treatment technique violation; returned to compliance
Reporting failure; returned to compliance
Monitoring failure; returned to compliance
OTHER; returned to compliance
Rio Arriba County, New Mexico (utility's served county per SDWIS GEOGRAPHIC_AREA — city-level not yet matched): a service population of 40,285. Local disparity score for pm2.5 (fine particulate) sits well below the reference (2). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 2 | well below the reference |
| Ozone | 216 | severely above the reference burden |
| Nitrogen dioxide (NO₂) | 53 | below the reference |
| Diesel particulate | 22 | well below the reference |
| Toxic releases (RSEI) | 3 | well below the reference |
| Traffic proximity | 3 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 95 | near the reference |
| Superfund site proximity | 90 | near the reference |
| RMP-facility proximity | 0 | well below the reference |
| Hazardous-waste site proximity | 41 | well below the reference |
| Underground storage tanks | 62 | below the reference |
| NPDES wastewater proximity | 116 | moderately above the reference |
| Drinking-water non-compliance | 104 | near 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.