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Water system · PWSID IL1110400

LAKE IN THE HILLS

LAKE IN THE HILLS, IL · ~28,661 people served

Check your exact address → LAKE IN THE HILLS overview
100
Excellent
PurityRadar safety score

PWSID

IL1110400

State

Illinois

City

LAKE IN THE HILLS

Population served

28,661

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Apr 2025). Levels in parts per trillion (ppt).

Lithium

10,000 ppt

limit —

No federal limit

Violations & enforcement

8

Violations on record

0

Unaddressed

3

Health-based

39

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2013. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Aug 2012 Resolved
Other · EPA contaminant 7000 began Jul 2012 Resolved
Monitoring & reporting · Nitrate began Jan 2006 Resolved
Other · EPA contaminant 7500 began Sep 2005 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jun 2005 Resolved
Monitoring & reporting · Nitrate began Jan 1999 Resolved
Monitoring & reporting · Barium began Jan 1999 Resolved
Max contaminant level (MCL) · Uranium health-based began Sep 1984 Resolved

Recent enforcement actions

  • State action · SOX Jul 2013
  • State action · SIF Oct 2012
  • State action · SOX Sep 2012
  • State action · SIA Sep 2012
  • State action · SIE Sep 2012
  • State action · SIA Aug 2012
  • State action · SOX Jan 2007
  • State action · SIA Jan 2007

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Arsenic

1 station · latest May 2021

0.82 · max 0.82 ug/l · 1

Copper

1 station · latest May 2021

1.6 · max 1.6 ug/l · 1

Fluoride

1 station · latest May 2021

0.7 · max 0.7 mg/l · 1

Manganese

1 station · latest May 2021

10.1 · max 10.1 ug/l · 1

Uranium

1 station · latest May 2021

0.032 · max 0.032 ug/l · 1

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system IL1110400 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.