St. Charles County, Missouri
20 ZIP codes · Avg score 78/100 · Grade B · Updated
ZipCheckup grade for St. Charles County: B.
This ZIP looks solid, with a few items worth a quick check.
Based on current EPA data, St. Charles County's 20 ZIP codes maintain an above-average drinking water safety record.
How St. Charles County Compares
How St. Charles County Compares
St. Charles County scores 6 points above the Missouri state average (72/100) and 5 points above the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
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%)
Estimated additional annual cost per homeowner: $1,524, driven primarily by flood
45.9% of homes built before 1978 (lead paint era)
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 DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,524
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
Remediation costs are relatively manageable for most homeowners in St. Charles County, representing a small fraction of property value.
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 serving St. Charles County
8 community water systems serving St. Charles County.
- C
- B
- C
- C
- B
- B
Show all 8 water systems
- B
- B
13 total water systems serve St. Charles County.
Systems with the most violations in St. Charles County
5 water systems with recorded EPA violations.
- 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 | 63301 | Saint Charles | 83 | B | 1 | $249K |
| 3 | 63303 | Saint Charles | 83 | B | 1 | $302K |
| 4 | 63304 | Saint Charles | 83 | B | 2 | $331K |
| 5 | 63368 | O Fallon | 83 | B | 2 | $328K |
| 6 | 63367 | Lake Saint Louis | 81 | B | 3 | $381K |
| 7 | 63366 | O Fallon | 77 | B | 10 | $284K |
| 8 | 63385 | Wentzville | 75 | B | 12 | $321K |
| 9 | 63348 | Foristell | 70 | B | 21 (1 health) | $365K |
| 10 | 63376 | Saint Peters | 65 | C | 4 | $256K |
| 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
Eight risk categories drive the selection - PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback - and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- 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 (78/100) 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.