Water Quality in 63366 — O Fallon, MO
EPA data for ST CHARLES COUNTY PWSD 2
Data source: U.S. Environmental Protection Agency (EPA) SDWIS Last verified: March 16, 2026
Your Water System
ZIP code 63366 in O Fallon, Missouri is served by ST CHARLES COUNTY PWSD 2 (EPA ID: MO6024530). This system provides water to approximately 100,587 people from surface water sources.
There are 12 community water systems serving this area.
Lead & Copper in Your Water
No Lead & Copper Rule sampling data available for systems serving this ZIP code.
Violation Summary
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| June 1, 2025 | Contaminant 0700 | Monitoring | Unresolved |
| June 1, 2025 | Contaminant 0700 | Monitoring | Resolved |
| June 1, 2025 | Contaminant 0700 | Monitoring | Unresolved |
| June 1, 2025 | Contaminant 0700 | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for water systems serving this ZIP code:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Contaminant 0700 | Other | 4 | No |
| Consumer Confidence Report Rule | Reporting | 1 | No |
Need help with your water quality?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| ST CHARLES COUNTY PWSD 2 | MO6024530 | 100,587 | Surface water |
| OFALLON PWS | MO6010588 | 32,515 | Surface water |
| ST CHARLES CO PWSD #2 WRIGHT CITY | MO6010874 | 3,550 | Groundwater |
| ST PAUL PWS | MO6011535 | 1,700 | Groundwater |
| ST CHARLES COUNTY PWSD 2 WARREN | MO6024629 | 1,192 | Groundwater |
What You Can Do
- Review your annual Consumer Confidence Report (CCR) — Your utility publishes this each July
- Test your home’s water — Especially if you have older plumbing (pre-1986) that may contain lead
- Stay informed — Bookmark this page to check for updates on your water quality
Need help with water testing or filtration?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Other Water Quality Reports in Missouri
- 63005 (Chesterfield)
- 63010 (Arnold) — 4 violations
- 63012 (Barnhart)
- 63013 (Beaufort) — 29 violations
- 63014 (Berger) — 1 violation
- 63016 (Cedar Hill) — 35 violations
- 63019 (Crystal City) — 10 violations
- 63020 (De Soto) — 3 violations
- 63023 (Dittmer) — 3 violations
- 63025 (Eureka) — 9 violations
- 63026 (Fenton) — 3 violations
- 63028 (Festus) — 1 violation
- 63037 (Gerald) — 2 violations
- 63048 (Herculaneum)
- 63049 (High Ridge)
- 63701 (Cape Girardeau) — 15 violations
- 63901 (Poplar Bluff) — 2 violations
- 64002 (Lees Summit) — 16 violations
- 64013 (Blue Springs) — 4 violations
- 64050 (Independence) — 3 violations
Nearby Water Quality Reports
- 63005 (Chesterfield) — 15 mi
- 63025 (Eureka) — 22 mi — 9 violations
- 63026 (Fenton) — 27 mi — 3 violations
- 63049 (High Ridge) — 27 mi
- 63016 (Cedar Hill) — 33 mi — 35 violations
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for ST CHARLES COUNTY PWSD 2 (MO6024530) on EPA.gov.
Frequently Asked Questions
Is the tap water in 63366 safe to drink?
Based on EPA records, the water system serving ZIP code 63366 has only monitoring/reporting violations, which are procedural in nature. However, individual home conditions (old pipes, well water) can affect quality.
Where does 63366’s water come from?
The primary water source for this area is surface water. ST CHARLES COUNTY PWSD 2 serves approximately 100,587 people.
How can I get my water tested?
Contact your local water utility for a free water quality report, or hire a certified lab for independent home water testing. The EPA recommends testing annually if you use a private well.
Does 63366 have lead in the water?
No Lead and Copper Rule sampling data is currently available in EPA records for water systems serving ZIP code 63366. If you are concerned about lead, contact your water utility or have your tap water independently tested.
What is the radon risk in 63366?
Radon zone data is not available for ZIP code 63366. The EPA recommends testing all homes for radon regardless of location, as radon levels can vary significantly even within the same neighborhood.