New Castle County, Delaware
52 ZIP codes · Avg score 67/100 · Grade C · Updated
ZipCheckup grade for New Castle County: C.
A mixed picture - some signals here are worth your attention.
Water safety in New Castle County is uneven - some of its 52 ZIP codes meet standards cleanly while others carry documented violations.
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 Last verified:
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%)
Estimated additional annual cost per homeowner: $4,344, driven primarily by 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 DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $4,344
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
Remediation costs are relatively manageable for most homeowners in New Castle 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 New Castle County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving New Castle County
8 community water systems serving New Castle County.
- C
- C
- C
- C
- B
- C
Show all 8 water systems
- B
- B
10 total water systems serve New Castle County.
Systems with the most violations in New Castle County
1 water system with recorded EPA violations.
- 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
Editorial-only picks, screened against the EPA detections on file.
- 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.