New Castle County, Delaware
52 ZIP codes · Avg score 67/100 · Grade C
ZipCheckup grade for New Castle County: C.
A mixed picture - some signals here are worth your attention.
Somewhere in the middle: that is where the composite score for New Castle County lands, across 52 tracked ZIP codes.
How New Castle County Compares
How New Castle County Compares
New Castle County scores 14 points below the Delaware state average (81/100) and 6 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: New Castle County, Delaware
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.3 (asthma 10.4%, diabetes 12.2%)
Modeled additional annual cost estimate per homeowner: $4,169, largest modeled factor: Sea Level
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: $4,169
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Water Safety Affordability
How much it costs to fix water issues relative to home values in New Castle County
Modeled remediation costs in New Castle 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 New Castle County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to New Castle County ZIP codes
8 community water systems mapped to New Castle County ZIP codes; EPA may list more systems serving the county.
- C
- C
- C
- C
- B
- C
Show all 8 water systems
- B
- B
10 water systems mapped to New Castle County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in New Castle County
1 water system with violations in EPA records.
- C
All ZIP Codes in New Castle County
52 ZIP codes tracked in New Castle County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 19709 | Middletown | 83 | B | 0 | $445K |
| 2 | 19701 | Bear | 67 | C | 0 | $338K |
| 3 | 19702 | Newark | 67 | C | 0 | $331K |
| 4 | 19703 | Claymont | 67 | C | 0 | $267K |
| 5 | 19707 | Hockessin | 67 | C | 0 | $534K |
| 6 | 19711 | Newark | 67 | C | 0 | $376K |
| 7 | 19713 | Newark | 67 | C | 0 | $268K |
| 8 | 19808 | Wilmington | 67 | C | 0 | $310K |
| 9 | 19720 | New Castle | 66 | C | 1 | $243K |
| 10 | 19732 | Rockland | 66 | C | 1 | $705K |
| 11 | 19801 | Wilmington | 66 | C | 1 | $196K |
| 12 | 19802 | Wilmington | 66 | C | 1 | $188K |
| 13 | 19803 | Wilmington | 66 | C | 1 | $436K |
| 14 | 19804 | Wilmington | 66 | C | 1 | $245K |
| 15 | 19805 | Wilmington | 66 | C | 1 | $220K |
| 16 | 19806 | Wilmington | 66 | C | 1 | $371K |
| 17 | 19809 | Wilmington | 66 | C | 1 | $309K |
| 18 | 19810 | Wilmington | 66 | C | 1 | $420K |
| 19 | 19706 | Delaware City | — | — | 0 | $245K |
| 20 | 19708 | Kirkwood | — | — | — | |
| 21 | 19710 | Montchanin | — | — | — | |
| 22 | 19712 | Newark | — | — | — | |
| 23 | 19714 | Newark | — | — | — | |
| 24 | 19715 | Newark | — | — | — | |
| 25 | 19716 | Newark | — | — | 0 | — |
| 26 | 19717 | Newark | — | — | 0 | — |
| 27 | 19718 | Newark | — | — | — | |
| 28 | 19721 | New Castle | — | — | — | |
| 29 | 19725 | Newark | — | — | — | |
| 30 | 19726 | Newark | — | — | — | |
| 31 | 19730 | Odessa | — | — | 0 | $299K |
| 32 | 19731 | Port Penn | — | — | 0 | $348K |
| 33 | 19733 | Saint Georges | — | — | $221K | |
| 34 | 19734 | Townsend | — | — | 0 | $426K |
| 35 | 19735 | Winterthur | — | — | — | |
| 36 | 19736 | Yorklyn | — | — | 0 | — |
| 37 | 19850 | Wilmington | — | — | — | |
| 38 | 19880 | Wilmington | — | — | — | |
| 39 | 19884 | Wilmington | — | — | — | |
| 40 | 19885 | Wilmington | — | — | — | |
| 41 | 19886 | Wilmington | — | — | — | |
| 42 | 19887 | Wilmington | — | — | — | |
| 43 | 19890 | Wilmington | — | — | — | |
| 44 | 19891 | Wilmington | — | — | — | |
| 45 | 19892 | Wilmington | — | — | — | |
| 46 | 19893 | Wilmington | — | — | — | |
| 47 | 19894 | Wilmington | — | — | — | |
| 48 | 19895 | Wilmington | — | — | — | |
| 49 | 19896 | Wilmington | — | — | — | |
| 50 | 19897 | Wilmington | — | — | — | |
| 51 | 19898 | Wilmington | — | — | — | |
| 52 | 19899 | Wilmington | — | — | — |
Recommended Buyer Guides for New Castle County
These buyer guides are matched by rule rather than by hand - a PFAS record adds a PFAS filter guide, a lead action-level exceedance adds lead filter guides, a high share of pre-1978 homes adds lead paint test kits, EPA Radon Zone 1 add radon kits, and a top flood or wildfire risk adds related equipment.
- Best Water Testing Kits — Baseline water quality check for your ZIP
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant peace of mind
Deep Dive Reports
Detailed analysis for New Castle County, Delaware
Overview
New Castle County in Delaware covers 52 tracked ZIP records with an average Home Safety Score of C (67/100) across 18 scored records.
10 of 25 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 Delaware 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.