Knox County, Ohio
8 ZIP codes · Avg score 54/100 · Grade D
ZipCheckup grade for Knox County: D.
Federal records show several conditions worth reviewing.
ZipCheckup rates Knox County near the bottom of its five-grade scale, with 8 tracked ZIP codes.
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
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%)
Modeled additional annual cost estimate per homeowner: $1,281, largest modeled factor: Flood
57% 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: $1,281
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
Modeled remediation costs in Knox 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 Knox County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Knox County ZIP codes
5 community water systems mapped to Knox County ZIP codes; EPA may list more systems serving the county.
- D
- D
- D
- D
- D
Systems with the most violations in Knox County
4 water systems with violations in EPA records.
- 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
Nothing on this list means a problem exists in your own home: the matches are drawn from county- and ZIP-level records, so a guide shows up because of an area signal, and only testing at your tap describes a specific household.
- Best Lead Paint Test Kits — 57% of homes built before 1980
- 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 an average Home Safety grade of D across its scored ZIP records. Here are steps to protect your household.
Test your tap water
Ask a certified laboratory which tests it offers for lead, bacteria, and other contaminants relevant to your home; a $20-$50 kit may cover only certain contaminants.
Consider a certified water filter
NSF/ANSI-certified filters reduce the specific contaminants listed on their certification. 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 reports monitored contaminants detected in the utility's water and related compliance information.
Check for lead in your home
57% of homes in this county were built before 1980. Older plumbing and solder can leach lead into drinking water, especially after water sits in the pipes.