Contaminant 5000
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2026 (contaminant 5000).
PWSID CO0142538 · Purchased / wholesalePrivate
96 people served. 1 health-based SDWIS violation recorded in the past 5 years. 7 remain unresolved. Last cited this year.
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2026 (contaminant 5000).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2025 (contaminant 5000).
Unresolved Revised Total Coliform Rule violation cited in 2024 (contaminant 8000).
Unresolved Surface Water Treatment Rule violation cited in 2024 (contaminant 0200).
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
Failure to monitor as scheduled; returned to compliance
Monitoring failure; returned to compliance
Failure to monitor as scheduled; returned to compliance
Monitoring failure; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled; returned to compliance
OTHER; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled; returned to compliance
Treatment technique violation; returned to compliance
OTHER; returned to compliance
Monitoring failure; returned to compliance
Monitoring failure; returned to compliance
Monitoring failure
Monitoring failure; 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
Monitoring failure; returned to compliance
Monitoring failure
Monitoring failure; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled; returned to compliance
Cortez, Colorado (Census place; block-group disparity scores aggregated by centroid containment): a service population of 8,832. 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 | 132 | moderately above the reference |
| Nitrogen dioxide (NO₂) | 59 | below the reference |
| Diesel particulate | 9 | well below the reference |
| Toxic releases (RSEI) | 0 | well below the reference |
| Traffic proximity | 42 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 90 | below the reference |
| Superfund site proximity | 0 | well below the reference |
| RMP-facility proximity | 0 | well below the reference |
| Hazardous-waste site proximity | 0 | well below the reference |
| Underground storage tanks | 108 | near the reference |
| NPDES wastewater proximity | 50 | 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 2024-01-01 → 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.