Knox County, Ohio
9 ZIP codes · Avg score 56/100 · Grade C · Updated 2026-06-03
Within Knox County, safety data across 9 ZIP codes suggests a fair but uneven system — violations are present and worth checking at the ZIP level.
How Knox County Compares
How Knox County Compares
Knox County scores 4 points below the Ohio state average (60/100) and 12 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
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 12.8%)
Estimated additional annual cost per homeowner: $1,459, driven primarily by sea_level
Infrastructure: 0.405% avg pipe failure probability, 38% of ZIPs at high risk
69.4% 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
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,459
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
23,309 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 with Most Violations
Top 5 systems in Knox County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Knox County Water and Wastewater Public Water System | 7,710 | 2 |
| 2 | Del-Company Water Company, Inc. | 150,000 | 2 |
| 3 | Gambier Village Public Water System | 2,502 | 2 |
| 4 | MOUNT VERNON CITY PWS | 16,990 | 2 |
| 5 | Danville Village Public Water System | 1,014 | 1 |
9 total water systems serve Knox County.
All ZIP Codes in Knox County
9 ZIP codes tracked in Knox County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 43019 | Fredericktown | 70 | B | 1 | $196K |
| 2 | 43037 | Martinsburg | 66 | C | 0 | $265K |
| 3 | 43050 | Mount Vernon | 63 | C | 1 | $199K |
| 4 | 43022 | Gambier | 62 | C | 1 | $282K |
| 5 | 43005 | Bladensburg | 53 | D | 0 | — |
| 6 | 43014 | Danville | 53 | D | 1 | $199K |
| 7 | 43028 | Howard | 53 | D | 0 | $241K |
| 8 | 43048 | Mount Liberty | 40 | D | 0 | — |
| 9 | 43317 | Chesterville | 40 | D | 0 | $117K |
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 — 69.4% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Knox County, Ohio
Overview
Knox County in Ohio covers 9 ZIP codes with an average Home Safety Score of C (56/100).
4 of 9 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Ohio water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.