Knox County, Ohio
8 ZIP codes · Avg score 54/100 · Grade D · Updated
ZipCheckup grade for Knox County: D.
Several federal signals point to home-safety risks in this ZIP.
Within Knox County's 8 monitored ZIP codes, water quality data indicates below-average safety - independent testing is a reasonable precaution.
How Knox County Compares
How Knox County Compares
Knox County scores 6 points below the Ohio state average (60/100) and 19 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 Last verified:
ZIP Code Risk Map
Water Quality Map: Knox County, Ohio
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.1 (asthma 11%, diabetes 12.6%)
Estimated additional annual cost per homeowner: $1,555, driven primarily by flood
61.4% 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: $1,555
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
25,715 housing units in Knox 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 Knox County
Remediation costs are relatively manageable for most homeowners in Knox 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 Knox County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Knox County
5 community water systems serving Knox County.
- D
- D
- D
- D
- D
Systems with the most violations in Knox County
4 water systems with recorded EPA violations.
- D
- D
- D
- D
All ZIP Codes in Knox County
8 ZIP codes tracked in Knox County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 43022 | Gambier | 64 | C | 4 | $282K |
| 2 | 43028 | Howard | 63 | C | 4 | $241K |
| 3 | 43011 | Centerburg | 50 | D | 0 | $287K |
| 4 | 43019 | Fredericktown | 50 | D | 1 | $196K |
| 5 | 43050 | Mount Vernon | 45 | D | 6 | $199K |
| 6 | 43014 | Danville | — | — | 2 | $199K |
| 7 | 43037 | Martinsburg | — | — | $265K | |
| 8 | 43048 | Mount Liberty | — | — | — |
Recommended Buyer Guides for Knox County
While many sites publish identical guide lists across every county they cover, the selection here changes by location - driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Lead Paint Test Kits — 61.4% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- 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 Knox County, Ohio
Overview
Knox County in Ohio covers 8 tracked ZIP records with an average Home Safety Score of D (54/100) across 5 scored records.
5 of 6 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. The available record reports no health-based violations for this measured scope.
← Back to Ohio 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.
What You Can Do
Knox County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
61.4% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.