Contaminant 5200
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2026 (contaminant 5200).
PWSID CO0135505 · Purchased / wholesalePrivate
125 people served. 1 health-based SDWIS violation recorded in the past 5 years. 3 remain unresolved. Last cited this year.
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2026 (contaminant 5200).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2026 (contaminant 5200).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2025 (contaminant 5000).
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.
Treatment technique violation
Reporting failure
Failure to monitor as scheduled
Centennial, Colorado (Census place; block-group disparity scores aggregated by centroid containment): a service population of 107,702. Local disparity score for pm2.5 (fine particulate) sits well below the reference (31). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 31 | well below the reference |
| Ozone | 56 | below the reference |
| Nitrogen dioxide (NO₂) | 32 | well below the reference |
| Diesel particulate | 44 | well below the reference |
| Toxic releases (RSEI) | 34 | well below the reference |
| Traffic proximity | 42 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 7 | well below the reference |
| Superfund site proximity | 24 | well below the reference |
| RMP-facility proximity | 38 | well below the reference |
| Hazardous-waste site proximity | 13 | well below the reference |
| Underground storage tanks | 30 | well below the reference |
| NPDES wastewater proximity | 44 | 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 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.