St. Charles County, Missouri
20 ZIP codes · Avg score 70/100 · Grade B
ZipCheckup grade for St. Charles County: B.
This ZIP has a few items worth a quick check.
Across St. Charles County, ZIP-level Home Safety Scores average out to a grade in the top two bands; the page tracks 20 ZIP codes in all.
How St. Charles County Compares
How St. Charles County Compares
St. Charles County scores 1 points below the Missouri state average (71/100) and 3 points below the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData
ZIP Code Risk Map
Water Quality Map: St. Charles County, Missouri
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12 (asthma 10%, diabetes 10.3%)
Modeled additional annual cost estimate per homeowner: $1,356, largest modeled factor: Flood
28% of homes built before 1980 (lead paint was banned for residential use in 1978)
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,356
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
171,032 housing units in St. Charles County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in St. Charles County
Modeled remediation costs in St. Charles County can be compared with the median property value; actual costs vary by property.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for St. Charles County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to St. Charles County ZIP codes
8 community water systems mapped to St. Charles County ZIP codes; EPA may list more systems serving the county.
- C
- B
- C
- C
- B
- B
Show all 8 water systems
- B
- B
13 water systems mapped to St. Charles County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in St. Charles County
5 water systems with violations in EPA records.
- B
- B
- B
- C
- B
All ZIP Codes in St. Charles County
20 ZIP codes tracked in St. Charles County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 63141 | Saint Louis | 83 | B | 0 | $572K |
| 2 | 63367 | Lake Saint Louis | 81 | B | 3 | $381K |
| 3 | 63385 | Wentzville | 75 | B | 12 | $321K |
| 4 | 63348 | Foristell | 70 | B | 21 (1 health) | $365K |
| 5 | 63301 | Saint Charles | 66 | C | 1 | $249K |
| 6 | 63303 | Saint Charles | 66 | C | 1 | $302K |
| 7 | 63304 | Saint Charles | 66 | C | 2 | $331K |
| 8 | 63368 | O Fallon | 66 | C | 2 | $328K |
| 9 | 63376 | Saint Peters | 65 | C | 4 | $256K |
| 10 | 63366 | O Fallon | 60 | C | 10 | $284K |
| 11 | 63177 | Saint Louis | — | — | — | |
| 12 | 63302 | Saint Charles | — | — | — | |
| 13 | 63332 | Augusta | — | — | 2 | $386K |
| 14 | 63338 | Cottleville | — | — | — | |
| 15 | 63346 | Flinthill | — | — | — | |
| 16 | 63365 | New Melle | — | — | — | |
| 17 | 63370 | Olney | — | — | — | |
| 18 | 63373 | Portage Des Sioux | — | — | $207K | |
| 19 | 63378 | Treloar | — | — | — | |
| 20 | 63386 | West Alton | — | — | $156K |
Recommended Buyer Guides for St. Charles County
Read the note next to each link: it gives the reason, such as a radon zone designation or housing age, that led to the recommendation.
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for St. Charles County, Missouri
Overview
St. Charles County in Missouri covers 20 tracked ZIP records with an average Home Safety Score of B (70/100) across 10 scored records.
10 of 11 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 1 health-based violation appear in the available health breakdown.
← Back to Missouri Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.