Contaminant 7000
Unresolved Phase I/II/V Synthetic Organic Chemical Rules violation cited in 2025 (contaminant 7000).
PWSID IL0970200 · GroundwaterMunicipal
11,780 people served. No health-based SDWIS violations recorded in the past 5 years. 25 remain unresolved. Last cited 1 year ago.
Unresolved Phase I/II/V Synthetic Organic Chemical Rules violation cited in 2025 (contaminant 7000).
Unresolved Lead and Copper Rule violation cited in 2025 (thallium).
Unresolved Lead and Copper Rule violation cited in 2025 (contaminant 1925).
Unresolved Lead and Copper Rule violation cited in 2025 (contaminant 1927).
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
Failure to monitor as scheduled
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Lake County, Illinois (utility's served county per SDWIS GEOGRAPHIC_AREA — city-level not yet matched): a service population of 713,159. Local disparity score for pm2.5 (fine particulate) sits below the reference (59). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 59 | below the reference |
| Ozone | 95 | near the reference |
| Nitrogen dioxide (NO₂) | 67 | below the reference |
| Diesel particulate | 65 | below the reference |
| Toxic releases (RSEI) | 85 | below the reference |
| Traffic proximity | 52 | below the reference |
| Lead-paint risk (pre-1960 housing) | 55 | below the reference |
| Superfund site proximity | 71 | below the reference |
| RMP-facility proximity | 44 | well below the reference |
| Hazardous-waste site proximity | 65 | below the reference |
| Underground storage tanks | 76 | below the reference |
| NPDES wastewater proximity | 71 | below the reference |
| Drinking-water non-compliance | 28 | 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 2023-01-01 → 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.