CITY REPORT IL

O Fallon, IL: 5 Violations - Home Safety 83/100

1 ZIP code · 5 water systems · Updated

ZipCheckup grade for O Fallon: B.

This ZIP has a few items worth a quick check.

In the dataset behind this page, O Fallon, IL receives one of the two highest grades; read the compliance history system by system for details.

How O Fallon Compares

O Fallon83/100
Illinois avg68/100
National avg73/100

Data: EPA SDWIS

1
ZIP Codes
5
Water Systems
1
ZIPs Linked to Systems with Violations
B · 83
Avg Safety Score
Zone 2
County Radon Potential (Moderate)
$274K
Median Home Value
$500
Est. Remediation (0.2% of home value)

What You Should Know About O Fallon Water

  • Your city's water systems recorded 5 violations since 2021.
  • Average of reported 90th-percentile lead results: 0.0122 mg/L.
  • Homes built before 1986: 33% - older plumbing may contain lead solder.
  • Estimated remediation: $500 per household.
  • Health risk index (ZipCheckup composite of CDC data): 13.66.

Who Supplies Your Water in O Fallon

Counting every public water system linked to O Fallon, IL in federal data gives 5. The list below keeps the 3 largest by reported population served, a figure that covers each system's whole service area rather than the city alone. A household's own supplier is named on its water bill.

Overview

We track home safety data for 1 ZIP code in O Fallon, Illinois (population ~35,536), covering 5 community water systems serving approximately 218,964 people region-wide. The EPA snapshots used for this build directly map water systems to 1 of 1 ZIP codes.

1 of 1 ZIP code 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 (83/100)

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 of reported 90th-percentile lead results: 0.0122 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 1 ZIP code with known status exceed the EPA lead action level

Radon Risk

1 of 1 ZIP records with known zones is in EPA Radon Zone 2.

The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.

Top Contaminants

Contaminant Category Violations ZIPs Affected
Haloacetic Acids (HAA5) Disinfection Byproducts 4 1
Total Trihalomethanes (TTHM) Disinfection Byproducts 4 1
Lead and Copper Rule Revisions Treatment Technique 2 1

Areas with Most Violations

ZIP Code Safety Score Violations Health-Based System
62269 B 5 0 O Fallon

All ZIP Codes in O Fallon

  • 62269 [B] - 5 violations

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Health Outcomes in O Fallon

11.1%
Asthma (US: 9.8%)
13.1%
Diabetes (US: 10.4%)
16.9%
Poor Mental Health (US: 14.8%)

Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.

Compared to National Average

Asthma 11.1% ↑
Diabetes 13.1% ↑
Mental Health 16.9% ↑

Vertical line = national average. ■ Above national · ■ Below national

Top Contaminants in O Fallon Water

Haloacetic Acids (HAA5) 4 violations
Disinfection Byproducts · EPA regulatory level for the contaminant named above: 0.06 mg/L
Increased cancer risk with long-term exposure above the MCL
Total Trihalomethanes (TTHM) 4 violations
Disinfection Byproducts · EPA regulatory level for the contaminant named above: 0.08 mg/L
Increased cancer risk with long-term exposure above the MCL
Lead and Copper Rule Revisions 2 violations
Treatment Technique

Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.

Housing & Infrastructure in O Fallon

1994
Median Build Year
33%
Built Before 1986
16%
Built Before 1970
Copper
Likely Pipe Material

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

Lead solder was allowed in new plumbing until the 1986 federal restrictions, which is why older homes in O Fallon deserve a closer look; the median build year is 1994.

1994
Median Year Built
33%
Pre-1986 (lead solder era; lead paint banned 1978)
16%
Pre-1970 (Lead Pipes Risk)
Pre-1970 (16%) 1970–1986 (17%) Post-1986 (67%)

Most homes in O Fallon were built after 1986; lead exposure at a tap still depends on its service line and plumbing. Older homes should still be tested.

Source: U.S. Census Bureau ACS B25034.

Cost Context: What Remediation Means for O Fallon Homeowners

Compared with typical property prices, the remediation estimate for O Fallon is small in percentage terms - at or under one percent.

Median Home Value
$274,200
Est. Remediation
$500
Remediation as % of home value 0.2%

Estimated remediation costs in O Fallon can be compared with local home values. The $300–$800 estimated range can be set against the median property value; actual costs vary by home. Home values are 49% above the Illinois average.

Lead Exposure Risk for Children in O Fallon

33%
Homes Built Before 1986
0.0122
mg/L average of reported water-system 90th-percentile lead results (the 0.015 action level applies to each system's result, not to this average)

Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.

33% of O Fallon homes were constructed before 1986, when federal law began limiting lead in pipes, solder and flux. Across the city's ZIP codes, water systems' 90th-percentile lead results average no less than 0.010 mg/L. That average can mix higher and lower systems, so it neither confirms nor rules out a problem at a single address; asking the utility how the home's service line is classified in its inventory is a practical next step.

Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.

Historical NFIP Claim Context in O Fallon

33
Total FEMA Flood Claims
$15,406
Avg Reported Sum With Payment Data
0%
A/V Share of Claim-Record ZIPs

Historical NFIP data for O Fallon contains 33 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $15,406. Among ZIP codes with claim records, 0% 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 $500 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, IL

Frequently Asked Questions

What does the Home Safety Score mean for O Fallon, IL?
O Fallon has an average Home Safety Score of 83/100 (Grade B) under ZipCheckup model 4.0.0, an area-level model that draws on EPA water compliance records, PFAS screening, EPA radon zones, and annual EPA air quality data; see the methodology page for how inputs and coverage are handled. 5 violations appear in EPA records for water systems mapped to these ZIP codes. Check individual ZIP code reports for component details.
How many violations are on record for water systems serving O Fallon?
EPA records list 5 EPA violations for O Fallon water systems. These water-system violations are shown for 1 mapped ZIP code.
Does O Fallon water have lead?
The average of the reported 90th-percentile lead results across the ZIP codes of O Fallon is 0.0122 mg/L. The EPA action level of 0.015 mg/L applies to each water system's own 90th percentile, not to this average. EPA's health goal for lead is zero. Lead levels can vary by home - testing is recommended especially in older properties.
How does O Fallon compare to Illinois average?
O Fallon has an average Home Safety Score of 83/100, which is at or above the Illinois state average of 68/100 for the same model series.
How many water systems serve O Fallon?
Our records map 5 water systems to 1 ZIP code in O Fallon. The related population figure in our data is approximately 35,536 people; it is not a count of people served citywide.
How much does it cost to fix water issues in O Fallon?
Estimated remediation cost per household in O Fallon: $500; modeled range $300 to $800. Estimated costs may include filtration, pipe replacement, radon mitigation, or flood protection where applicable.
Home → Cities → Illinois → O Fallon, IL

How to cite this page

APA ZipCheckup. (2026). O Fallon, IL: 5 Violations - Home Safety 83/100. https://zipcheckup.com/cities/il/o-fallon/
BibTeX 
@misc{zipcheckup-cities-il-o-fallon,
  author = {{ZipCheckup}},
  title  = {{O Fallon, IL: 5 Violations - Home Safety 83/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/cities/il/o-fallon/}
}

Page version: October 2026.

Get safety alerts for O Fallon, Illinois

Free updates when EPA data changes for this area. No spam.

Unsubscribe anytime. Privacy Policy.

Share This Page

X Facebook
Violations found - check filter options Free tool - no phone call required.