ST CHARLES

ST. CHARLES, IL · ~33,103 people served

Check your exact address → ST. CHARLES overview

100

Excellent

PurityRadar safety score

PWSID

IL0894830

State

Illinois

City

ST. CHARLES

Population served

33,103

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

13,100 ppt

limit —

No federal limit

PFBS

4.3 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Other · EPA contaminant 7000 began Jul 2025 Unaddressed

Monitoring & reporting · Uranium began Oct 2020 Resolved

Other · EPA contaminant 7000 began Jul 2016 Resolved

Monitoring & reporting · Nitrate began Jan 2002 Resolved

Max contaminant level (MCL) · Gross alpha health-based began Jan 1991 Resolved

Max contaminant level (MCL) · Uranium health-based began Jan 1991 Resolved

Recent enforcement actions

State action · SIA Oct 2025
State action · SOX Jan 2021
State action · SIA Jan 2021
State action · SOX Jul 2017
State action · SIA Jul 2016
State action · SOX Nov 2003
State action · SIF Jun 2003
State action · SIE Mar 2003

This profile is built from EPA public records for system IL0894830 — 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.