CITY REPORT MO

Saint Charles, MO: 3 Violations - Home Safety 66/100

4 ZIP codes · 5 water systems · Updated

ZipCheckup grade for Saint Charles: C.

A mixed picture - some signals here are worth your attention.

Documented records place Saint Charles, MO in the middle grade tier.

How Saint Charles Compares

Saint Charles66/100
Missouri avg71/100
National avg73/100

Data: EPA SDWIS

4
ZIP Codes
5
Water Systems
3
ZIPs Linked to Systems with Violations
C · 66
Avg Safety Score
Zone 2
County Radon Potential (Moderate)
$302K
Median Home Value

What You Should Know About Saint Charles Water

  • Your city's water systems recorded 3 violations since 2021.
  • Average of reported 90th-percentile lead results: 0.0011 mg/L.
  • Homes built before 1986: 48% - older plumbing may contain lead solder.
  • Health risk index (ZipCheckup composite of CDC data): 11.99.

Who Supplies Your Water in Saint Charles

Multiple utilities show up for Saint Charles, MO: 3 are listed here out of 5 tracked federally.

Overview

We track home safety data for 4 ZIP codes in Saint Charles, Missouri (population ~141,641), covering 5 community water systems serving approximately 1,343,223 people region-wide. The EPA snapshots used for this build directly map water systems to 3 of 4 ZIP codes.

3 of 3 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 Saint Charles: C (66/100)

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

Saint Charles water systems draw from: Groundwater, Surface water.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0011 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 3 ZIP codes with known status exceed the EPA lead action level

Radon Risk

4 of 4 ZIP records with known zones are 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
Lead and Copper Rule Treatment Technique 3 2
Revised Total Coliform Rule Microbiological 2 1
Groundwater Rule Treatment Technique 2 1

Areas with Most Violations

ZIP Code Safety Score Violations Health-Based System
63304 C 2 0 Mo American St Louis St Charles Counties
63301 C 1 0 St Charles Public Water System
63303 C 1 0 St Charles Public Water System

All ZIP Codes in Saint Charles

Data Sources

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

Health Outcomes in Saint Charles

10%
Asthma (US: 9.8%)
10.3%
Diabetes (US: 10.4%)
15.1%
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 10% ↑
Diabetes 10.3% ↓
Mental Health 15.1% ↑

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

Top Contaminants in Saint Charles Water

Lead and Copper Rule 3 violations
Treatment Technique
Developmental delays in children, kidney damage
Revised Total Coliform Rule 2 violations
Microbiological
Indicates possible bacterial contamination
Groundwater Rule 2 violations
Treatment Technique

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

Housing & Infrastructure in Saint Charles

1984
Median Build Year
48%
Built Before 1986
20%
Built Before 1970
Copper
Likely Pipe Material

With 48% of homes built before 1986, lead solder in plumbing is a potential concern. Federal law banned lead solder in drinking-water plumbing in 1986, but many older homes retain original plumbing.

Source: U.S. Census Bureau American Community Survey (ACS).

Housing Age Profile

Check your utility's service line inventory as well as your home's build year; in Saint Charles, where the median build year is 1984, both pieces help.

1984
Median Year Built
48%
Pre-1986 (lead solder era; lead paint banned 1978)
20%
Pre-1970 (Lead Pipes Risk)
Pre-1970 (20%) 1970–1986 (28%) Post-1986 (52%)

Most homes in Saint Charles 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.

Lead Exposure Risk for Children in Saint Charles

48%
Homes Built Before 1986
0.0011
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.

If you have young children or are pregnant, consider testing your home's water - especially if your home was built before 1986.

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

Historical NFIP Claim Context in Saint Charles

5,846
Total FEMA Flood Claims
$15,580
Avg Reported Sum With Payment Data
100%
A/V Share of Claim-Record ZIPs

Historical NFIP data for Saint Charles contains 5,846 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $15,580. 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.

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.

What You Can Do in Saint Charles

  1. Test your water at home. City-level data shows averages - your tap may differ. Check the certification, price and turnaround time of any water test kit or lab service.
  2. Install a certified water filter. For Lead and Copper Rule, listed in the water-quality records for Saint Charles: if it is a rule or reporting requirement rather than a contaminant, ask your utility what the record involved; for bacteria, follow any boil-water notice from your utility; for a specific chemical contaminant, check whether a filter is certified to reduce it. Not every contaminant has a consumer filter certification.
  3. Check your home's plumbing. With 48% of homes built before 1986, lead solder is a real possibility.

Deep Dive Reports

Detailed analysis for Saint Charles, MO

Frequently Asked Questions

What does the Home Safety Score mean for Saint Charles, MO?
Saint Charles has an average Home Safety Score of 66/100 (Grade C) 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. 3 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 Saint Charles?
EPA records list 3 EPA violations for Saint Charles water systems. These water-system violations are shown for 4 mapped ZIP codes.
Does Saint Charles water have lead?
The average of the reported 90th-percentile lead results across the ZIP codes of Saint Charles is 0.0011 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 Saint Charles compare to Missouri average?
Saint Charles has an average Home Safety Score of 66/100, which is below the Missouri state average of 71/100 for the same model series.
How many water systems serve Saint Charles?
Our records map 5 water systems to 4 ZIP codes in Saint Charles. The related population figure in our data is approximately 141,641 people; it is not a count of people served citywide.
Home → Cities → Missouri → Saint Charles, MO

How to cite this page

APA ZipCheckup. (2026). Saint Charles, MO: 3 Violations - Home Safety 66/100. https://zipcheckup.com/cities/mo/saint-charles/
BibTeX 
@misc{zipcheckup-cities-mo-saint-charles,
  author = {{ZipCheckup}},
  title  = {{Saint Charles, MO: 3 Violations - Home Safety 66/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/cities/mo/saint-charles/}
}

Page version: October 2026.

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