Jefferson County, Missouri
18 ZIP codes · Avg score 79/100 · Grade B · Updated
ZipCheckup grade for Jefferson County: B.
This ZIP looks solid, with a few items worth a quick check.
Homeowners across Jefferson County's 18 ZIP codes live with water safety scores that generally beat state and national averages.
How Jefferson County Compares
How Jefferson County Compares
Jefferson County scores 7 points above the Missouri state average (72/100) and 6 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: Jefferson County, Missouri
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.7 (asthma 10.5%, diabetes 11.2%)
Estimated additional annual cost per homeowner: $2,141, driven primarily by flood
51.9% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↓ Improving trendEPA violation counts by year across Jefferson County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 9 violations. Past 5 years: 15 total (15 health-based). Health-based violations are declining versus the prior 2-year window.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
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: $2,141
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
76,202 housing units in Jefferson 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 Jefferson County
Remediation costs are relatively manageable for most homeowners in Jefferson 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 Jefferson County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Jefferson County
8 community water systems serving Jefferson County.
- B
- B
- B
- B
- B
- B
Show all 8 water systems
- B
- B
25 total water systems serve Jefferson County.
Systems with the most violations in Jefferson County
5 water systems with recorded EPA violations.
- B
- B
- B
- B
All ZIP Codes in Jefferson County
18 ZIP codes tracked in Jefferson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 63010 | Arnold | 83 | B | 2 | $214K |
| 2 | 63047 | Hematite | 82 | B | 2 | — |
| 3 | 63052 | Imperial | 81 | B | 8 | $259K |
| 4 | 63016 | Cedar Hill | 80 | B | 6 (1 health) | $207K |
| 5 | 63051 | House Springs | 80 | B | 7 | $186K |
| 6 | 63070 | Pevely | 80 | B | 7 | $209K |
| 7 | 63012 | Barnhart | 78 | B | 11 | $229K |
| 8 | 63019 | Crystal City | 78 | B | 7 (3 health) | $170K |
| 9 | 63020 | De Soto | 78 | B | 9 (1 health) | $173K |
| 10 | 63050 | Hillsboro | 78 | B | 9 (1 health) | $256K |
| 11 | 63048 | Herculaneum | 77 | B | 11 (3 health) | $216K |
| 12 | 63028 | Festus | 73 | B | 15 (4 health) | $222K |
| 13 | 63023 | Dittmer | — | — | 1 | $220K |
| 14 | 63053 | Kimmswick | — | — | $217K | |
| 15 | 63057 | Liguori | — | — | — | |
| 16 | 63065 | Mapaville | — | — | — | |
| 17 | 63066 | Morse Mill | — | — | — | |
| 18 | 63630 | Cadet | — | — | 4 | $112K |
Recommended Buyer Guides for Jefferson County
Strictly editorial - no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- Best Lead Paint Test Kits — 51.9% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Jefferson County, Missouri
Overview
Jefferson County in Missouri covers 18 tracked ZIP records with an average Home Safety Score of B (79/100) across 12 scored records.
14 of 14 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 4 health-based violations 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.