Delaware County, Ohio
11 ZIP codes · Avg score 50/100 · Grade D · Updated
ZipCheckup grade for Delaware County: D.
Several federal signals point to home-safety risks in this ZIP.
Water systems serving Delaware County's 11 ZIP codes record elevated violation rates - residents in affected areas may want to verify their local system's current status.
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 Last verified:
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%)
Estimated additional annual cost per homeowner: $1,202, driven primarily by flood
32.5% of homes built before 1978 (lead paint era)
Violation History (2022–2024)
→ Stable trendEPA violation counts by year across Delaware County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 5 violations. Past 5 years: 6 total (6 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
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: $1,202
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
Remediation costs are relatively manageable for most homeowners in Delaware 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 Delaware County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Delaware County
7 community water systems serving Delaware County.
- D
- D
- D
- D
- D
- D
Show all 7 water systems
- D
Systems with the most violations in Delaware County
4 water systems with recorded EPA violations.
- D
- D
- D
- D
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
Independent picks. EPA-grounded. Matched here.
- 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 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
32.5% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.