Home/ Directory/ IL/ JOLIET

Water system · PWSID IL1970450

JOLIET

JOLIET, IL · ~160,000 people served

Check your exact address → JOLIET overview
100
Excellent
PurityRadar safety score

PWSID

IL1970450

State

Illinois

City

JOLIET

Population served

160,000

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

Lithium

33,400 ppt

limit —

No federal limit

Violations & enforcement

55

Violations on record

0

Unaddressed

40

Health-based

219

Enforcement actions

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

Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Resolved
Monitoring & reporting · Uranium began Oct 2024 Resolved
Monitoring & reporting · Uranium began Oct 2024 Resolved
Monitoring & reporting · Uranium began Oct 2017 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2017 Resolved
Monitoring & reporting · Nitrate began Jan 2017 Resolved
Monitoring & reporting · Nitrate began Jan 2017 Resolved
Max contaminant level (MCL) · Uranium health-based began Oct 2007 Resolved
Monitoring & reporting · Total coliform began Aug 2007 Resolved
Max contaminant level (MCL) · Uranium health-based began Jul 2007 Resolved
Monitoring & reporting · EPA contaminant 0999 began Jul 2007 Resolved
Max contaminant level (MCL) · Uranium health-based began Apr 2007 Resolved

Recent enforcement actions

  • State action · SIF Aug 2025
  • State action · SIF Aug 2025
  • State action · SIF Aug 2025
  • State action · SIF Aug 2025
  • State action · SOX Apr 2025
  • State action · SOX Mar 2025
  • State action · SOX Mar 2025
  • State action · SOX Mar 2025

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

Manganese

2 stations · latest Oct 2022

20.6 · max 178 ug/L · 118

Arsenic

2 stations · latest Jun 2022

1.58 · max 3.01 ug/L · 111

Copper

2 stations · latest May 2022

2.08 · max 24.6 ug/L · 91

Lead

2 stations · latest May 2022

0.89 · max 8.99 ug/L · 74

Fluoride

1 station · latest Oct 2022

0.375 · max 0.57 mg/L · 22

Atrazine

1 station · latest Dec 2022

853 · max 1,060 ng/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 IL1970450 — 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.