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Water system · PWSID IL1110150

CRYSTAL LAKE

CRYSTAL LAKE, IL · ~40,661 people served

Check your exact address → CRYSTAL LAKE overview
100
Excellent
PurityRadar safety score

PWSID

IL1110150

State

Illinois

City

CRYSTAL LAKE

Population served

40,661

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 Jun 2025). Levels in parts per trillion (ppt).

PFBS

4.6 ppt

limit —

No federal limit

PFPeA

4.5 ppt

limit —

No federal limit

Violations & enforcement

1

Violations on record

0

Unaddressed

1

Health-based

11

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jun 2025. Official EPA record →

Max contaminant level (MCL) · Barium health-based began Jun 1986 Resolved

Recent enforcement actions

  • State action · SIF Jun 2025
  • State action · SOX Aug 2024
  • State action · SIE Jul 2024
  • State action · SIA Jul 2024
  • State action · SOX Sep 1987
  • State action · SIF Sep 1986
  • State action · SIF Sep 1986
  • State action · SIE Sep 1986

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

Fluoride

2 stations · latest May 2021

0.07 · max 0.1 mg/l · 4

Manganese

2 stations · latest May 2021

37.7 · max 78.3 ug/l · 4

Nitrate

1 station · latest May 2021

2.42 · max 2.47 mg/l as N · 4

Uranium

2 stations · latest May 2021

0.401 · max 0.458 ug/l · 4

Copper

2 stations · latest May 2021

2.8 · max 24.5 ug/l · 3

Lead

2 stations · latest May 2021

0.062 · max 0.079 ug/l · 3

Arsenic

1 station · latest May 2021

0.545 · max 0.56 ug/l · 2

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 IL1110150 — 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.