ST CHARLES CO PWSD #2 WRIGHT CITY

O'FALLON, MO · ~3,550 people served

Check your exact address → O'FALLON overview

100

Excellent

PurityRadar safety score

PWSID

MO6010874

State

Missouri

City

O'FALLON

Population served

3,550

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

Lithium

62,700 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2024 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2024 Resolved

Monitoring · Lead & Copper Rule began Dec 2021 Resolved

Monitoring & reporting · Total coliform began Dec 2014 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 2014 Resolved

Monitoring & reporting · EPA contaminant 3014 began Oct 2014 Resolved

Monitoring & reporting · Total coliform began Sep 2014 Resolved

Monitoring & reporting · Total coliform began Jan 2014 Resolved

Monitoring & reporting · Total coliform began Dec 2013 Resolved

Other · EPA contaminant 7000 began Jul 2013 Resolved

Monitoring & reporting · Total coliform began Feb 2009 Resolved

Monitoring & reporting · Total coliform began Apr 2006 Resolved

Recent enforcement actions

State action · SOX Sep 2025
State action · SIF May 2025
State action · SIA Dec 2024
State action · SIE Dec 2024
State action · SIF Jul 2022
State action · SIE Jan 2022
State action · SIA Jan 2022
State action · SOX Jan 2022

This profile is built from EPA public records for system MO6010874 — 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.