Clark County, Illinois
7 ZIP codes · Avg score 75/100 · Grade B · Updated
ZipCheckup grade for Clark County: B.
This ZIP looks solid, with a few items worth a quick check.
Compared to state averages, Clark County scores well - its 7 ZIP codes sit above the baseline for tap water quality.
How Clark County Compares
How Clark County Compares
Clark County scores 7 points above the Illinois state average (68/100) and 2 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: Clark County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.8 (asthma 10.3%, diabetes 12%)
Estimated additional annual cost per homeowner: $1,090, driven primarily by energy_code_gap
67.1% 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: $1,090
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
7,704 housing units in Clark 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 Clark County
Remediation costs are relatively manageable for most homeowners in Clark 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 Clark County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Clark County
5 community water systems serving Clark County.
- C
- B
- C
- C
- C
Systems with the most violations in Clark County
5 water systems with recorded EPA violations.
- C
- C
- B
- C
- C
All ZIP Codes in Clark County
7 ZIP codes tracked in Clark County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 62441 | Marshall | 81 | B | 3 | $140K |
| 2 | 62420 | Casey | 69 | C | 31 (1 health) | $122K |
| 3 | 62423 | Dennison | — | — | $148K | |
| 4 | 62442 | Martinsville | — | — | 5 (1 health) | $85K |
| 5 | 62474 | Westfield | — | — | $85K | |
| 6 | 62477 | West Union | — | — | $152K | |
| 7 | 62478 | West York | — | — | 24 | $132K |
Recommended Buyer Guides for Clark County
Editorial methodology pairs each documented risk in this county with the buyer category that addresses it, drawing on water-quality detections, housing-stock lead exposure, EPA Radon Zone designation, and FEMA flood and wildfire ratings. NSF-certified options surface where applicable, and products that match the specific contaminant take priority.
- Best Lead Paint Test Kits — 67.1% of homes built before 1978
Deep Dive Reports
Detailed analysis for Clark County, Illinois
Overview
Clark County in Illinois covers 7 tracked ZIP records with an average Home Safety Score of B (75/100) across 2 scored records.
4 of 4 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 Illinois 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.