Contaminant 7500
Unresolved Volatile Organic Chemical Rule violation cited in 2025 (contaminant 7500).
PWSID IL0310390 · Purchased / wholesaleMunicipal
37,000 people served. 1 health-based SDWIS violation recorded in the past 5 years. 9 remain unresolved. Last cited 1 year ago.
Unresolved Volatile Organic Chemical Rule violation cited in 2025 (contaminant 7500).
Unresolved Revised Total Coliform Rule violation cited in 2025 (contaminant 8000).
Unresolved Lead and Copper Rule violation cited in 2025 (thallium).
Unresolved Lead and Copper Rule violation cited in 2025 (contaminant 1925).
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
OTHER
Monitoring failure
Monitoring failure; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled
Treatment technique violation
OTHER; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Calumet City, Illinois (Census place; block-group disparity scores aggregated by centroid containment): a service population of 35,708. Local disparity score for pm2.5 (fine particulate) sits severely above the reference burden (204). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 204 | severely above the reference burden |
| Ozone | 199 | well above the reference burden |
| Nitrogen dioxide (NO₂) | 221 | severely above the reference burden |
| Diesel particulate | 202 | severely above the reference burden |
| Toxic releases (RSEI) | 211 | severely above the reference burden |
| Traffic proximity | 170 | well above the reference burden |
| Lead-paint risk (pre-1960 housing) | 142 | moderately above the reference |
| Superfund site proximity | 224 | severely above the reference burden |
| RMP-facility proximity | 234 | severely above the reference burden |
| Hazardous-waste site proximity | 203 | severely above the reference burden |
| Underground storage tanks | 146 | moderately above the reference |
| NPDES wastewater proximity | 228 | severely above the reference burden |
| Drinking-water non-compliance | 187 | well above the reference burden |
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.