O FALLON

O'FALLON, IL · ~46,603 people served

Check your exact address → O'FALLON overview

100

Excellent

PurityRadar safety score

PWSID

IL1631100

State

Illinois

City

O'FALLON

Population served

46,603

Primary source

SWP

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 Nov 2024). Levels in parts per trillion (ppt).

Lithium

9,600 ppt

limit —

No federal limit

PFBA

9.9 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2007. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Jan 2007 Resolved

Monitoring & reporting · Lead & Copper Rule began Apr 1997 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 1997 Resolved

Treatment technique · Lead & Copper Rule health-based began Sep 1993 Resolved

Treatment technique · Lead & Copper Rule health-based began Feb 1993 Resolved

Monitoring & reporting · Lead & Copper Rule began Apr 1992 Resolved

Recent enforcement actions

State action · SOX Jul 2007
State action · SIA Jul 2007
State action · SOX Apr 1998
State action · SOX Feb 1995
State action · SOX Dec 1992
State action · SIE Apr 1990
State action · SIA Apr 1990
State action · SIF Apr 1990

This profile is built from EPA public records for system IL1631100 — 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.