O Fallon, MO: 10 Violations - Home Safety 80/100
2 ZIP codes · 5 water systems · Updated
ZipCheckup grade for O Fallon: B.
This ZIP looks solid, with a few items worth a quick check.
EPA compliance records for O Fallon tell a largely clear story: violation rates are low, health-based exceedances are uncommon, and the city's grade puts it well above average within MO.
How O Fallon Compares
Data: EPA SDWIS
What You Should Know About O Fallon Water
- Your city's water systems recorded 10 violations in the past 5 years.
- Average lead level: 0.0029 mg/L.
- Homes built before 1986: 19% - older plumbing may contain lead solder.
- Estimated remediation: $2,400 per household.
- CDC health risk index: 11.99.
Who Supplies Your Water in O Fallon
Throughout O Fallon, MO, water comes from one of 3 primary utilities out of 5 total systems - independent providers with different rate structures, infrastructure, and compliance records that vary across the service territory.
- B
- B
- B
Overview
We track home safety data for 2 ZIP codes in O Fallon, Missouri (population ~100,311), covering 5 community water systems serving approximately 1,287,586 people region-wide. The EPA snapshots used for this build directly map water systems to 2 of 2 ZIP codes.
2 of 2 ZIP codes with a reported violation count in the available EPA record (100%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.
Home Safety Score
Average Home Safety Score for O Fallon: B (80/100)
Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| PFAS MCL Screen | UCMR 5 testing against the covered federal MCLs |
| Radon Risk | EPA radon zone classification |
| Annual AQI | EPA AirData county-year median with at least 90 observed days |
Water Sources
O Fallon water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0029 mg/L (EPA action level: 0.015 mg/L)
- 0 of 2 ZIP codes with known status exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 2 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Stage 1 DBP Rule | Treatment Technique | 6 | 1 |
| Surface Water Treatment Rule | Treatment Technique | 6 | 1 |
| Contaminant 0700 | Other | 5 | 2 |
| Consumer Confidence Report Rule | Reporting | 3 | 2 |
| Stage 2 DBP Rule | Treatment Technique | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 63366 | B | 10 | 0 | St Charles County Pwsd 2 |
| 63368 | B | 2 | 0 | St Charles County Pwsd 2 |
All ZIP Codes in O Fallon
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
Health Outcomes in O Fallon
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Top Contaminants in O Fallon Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in O Fallon
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Post-1986 construction is where the lower lead-solder risk lives, because that's when the federal ban on lead solder in plumbing took effect. In O Fallon, where the median build year is 1991, the housing stock falls broadly on the newer side of that threshold - a distribution that moderates aggregate plumbing-era risk compared to older housing markets.
Most homes in O Fallon were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for O Fallon Homeowners
In O Fallon, the equity impact of remediation is proportionally small - not the kind of financial commitment that rises to the level of a genuine planning constraint, but a minor share of what most properties here are worth.
Remediation costs in O Fallon are relatively low compared to home values. The $1,300–$3,750 estimated range is a small fraction of median property value. Home values are 87% above the Missouri average.
Lead Exposure Risk for Children in O Fallon
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
19% of housing in O Fallon predates the federal action against lead solder - a contained share - and aggregate readings stay beneath the regulatory benchmark. Lead therefore sits in a quiet position on the local water-quality picture, with single-home draws as the standard tool for confirming any one address.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical NFIP Claim Context in O Fallon
Historical NFIP data for O Fallon contains 347 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $24,243. Among ZIP codes with claim records, 100% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. The <strong>$2,400</strong> remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.
Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.
Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.
Deep Dive Reports
Detailed analysis for O Fallon, MO