Delaware County, Ohio
11 ZIP codes · Avg score 50/100 · Grade D
ZipCheckup grade for Delaware County: D.
Federal records show several conditions worth reviewing.
Bottom two grades: Delaware County, 11 ZIP codes.
How Delaware County Compares
How Delaware County Compares
Delaware County scores 10 points below the Ohio state average (60/100) and 23 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: Delaware County, Ohio
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11 (asthma 9.5%, diabetes 10.1%)
Modeled additional annual cost estimate per homeowner: $1,095, largest modeled factor: Flood
21% 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: $1,095
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
82,692 housing units in Delaware 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 Delaware County
Modeled remediation costs in Delaware 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 Delaware County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Delaware County ZIP codes
7 community water systems mapped to Delaware County ZIP codes; EPA may list more systems serving the county.
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Show all 7 water systems
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Systems with the most violations in Delaware County
4 water systems with violations in EPA records.
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All ZIP Codes in Delaware County
11 ZIP codes tracked in Delaware County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 43021 | Galena | 50 | D | 0 | $525K |
| 2 | 43035 | Lewis Center | 50 | D | 0 | $423K |
| 3 | 43061 | Ostrander | 50 | D | 1 | $387K |
| 4 | 43065 | Powell | 50 | D | 0 | $452K |
| 5 | 43066 | Radnor | 50 | D | 1 | $317K |
| 6 | 43074 | Sunbury | 50 | D | 0 | $397K |
| 7 | 43082 | Westerville | 50 | D | 0 | $433K |
| 8 | 43240 | Columbus | 50 | D | 0 | $290K |
| 9 | 43015 | Delaware | 48 | D | 3 | $312K |
| 10 | 43003 | Ashley | 47 | D | 4 | $198K |
| 11 | 43032 | Kilbourne | — | — | — |
Recommended Buyer Guides for Delaware County
Selection follows a fixed set of rules applied to local records: signals such as PFAS detections, lead action-level exceedances on record, a large share of pre-1978 housing, EPA Radon Zone 1, or a top flood or wildfire risk each add a related guide, and when none applies, general water testing and filtration guides are shown instead.
- 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 Delaware County, Ohio
Overview
Delaware County in Ohio covers 11 tracked ZIP records with an average Home Safety Score of D (50/100) across 10 scored records.
4 of 10 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
Delaware 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.