PWSID
MO6011535
State
Missouri
City
O'FALLON
Population served
1,700
Primary source
Groundwater
Score history
No change since tracking began Jun 18, 2026.
2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.
PFAS & contaminant readings
No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.
Violations & enforcement
2
Violations on record
0
Unaddressed
1
Health-based
6
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Apr 2025. Official EPA record →
Recent enforcement actions
- State action · SOX Apr 2025
- State action · SIA Jan 2016
- State action · SOX Jan 2014
- State action · SIF Aug 2008
- State action · SIA Jul 2008
- State action · SIE Jul 2008
This profile is built from EPA public records for system MO6011535 — 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.