O Fallon, MO Neighborhood Water Quality - Grade C
2 ZIP codes · 12 EPA violations
Data source: EPA SDWIS Last verified: 2026-07-19
ZipCheckup compares 2 ZIP codes across O Fallon, MO. The area averages a grade C (69/100); 2 ZIP codes carry recorded EPA violations.
Water quality varies significantly across O Fallon, MO. We analyzed 2 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.
City Overview: Grade C (69/100)
| Grade | Neighborhoods | % |
|---|---|---|
| A | 0 | 0% |
| B | 1 | 50% |
| C | 1 | 50% |
| D | 0 | 0% |
| F | 0 | 0% |
Neighborhood Rankings
Every ZIP code in O Fallon ranked by Home Safety Score:
| Rank | ZIP Code | Score | Grade | Violations | Lead Risk |
|---|---|---|---|---|---|
| 1 | 63368 | 74 | B | 6 | 0.0011 mg/L |
| 2 | 63366 | 64 | C | 6 | 0.0011 mg/L |
How Neighborhoods Compare
Each ZIP code compared to county and state averages:
- 2 neighborhoods score better than county average
- 0 neighborhoods score worse than county average
EPA Violations
- 12 total violations across O Fallon
- 0 health-based violations
- 2 of 2 ZIP codes have violations
- 0 ZIP codes exceed EPA lead action level
Top Contaminants
| Contaminant | Violations | ZIPs |
|---|---|---|
| Consumer Confidence Report Rule | 4 | 2 |
| Contaminant 0700 | 4 | 2 |
| Total Trihalomethanes (TTHM) | 2 | 2 |
| Stage 1 DBP Rule | 2 | 2 |
Frequently Asked Questions
What is the safest neighborhood in O Fallon?
ZIP code 63368 has the highest safety score in O Fallon at 74/100 (grade B). Check the full report for details.
Is O Fallon water safe to drink?
O Fallon has an average water safety score of 69/100 (C). Water quality varies by neighborhood — no ZIP codes currently exceed EPA lead limits. Always check your specific ZIP code.
Related Pages
Data Sources
- EPA SDWIS
- U.S. Census Bureau
Updated daily.