Strafford County, New Hampshire
20 ZIP codes · Home Safety Score unavailable · 0 of 20 tracked ZIP records scored · Updated
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: Strafford County, New Hampshire
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.4 (asthma 10.7%, diabetes 8.6%)
Estimated additional annual cost per homeowner: $1,397, driven primarily by flood
60.6% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↓ Improving trendEPA violation counts by year across Strafford County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 5 violations. Past 5 years: 12 total (12 health-based). Health-based violations are declining versus the prior 2-year window.
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: $1,397
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
55,804 housing units in Strafford 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 Strafford County
Remediation costs are relatively manageable for most homeowners in Strafford 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 Strafford County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Strafford County
8 community water systems serving Strafford County.
Show all 8 water systems
11 total water systems serve Strafford County.
Systems with the most violations in Strafford County
4 water systems with recorded EPA violations.
All ZIP Codes in Strafford County
20 ZIP codes tracked in Strafford County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 03815 | Center Strafford | — | — | — | |
| 2 | 03820 | Dover | — | — | 1 | $398K |
| 3 | 03821 | Dover | — | — | — | |
| 4 | 03822 | Dover | — | — | — | |
| 5 | 03823 | Madbury | — | — | 1 | $459K |
| 6 | 03824 | Durham | — | — | 0 | $470K |
| 7 | 03825 | Barrington | — | — | 0 | $350K |
| 8 | 03835 | Farmington | — | — | 0 | $273K |
| 9 | 03839 | Rochester | — | — | 1 (1 health) | $300K |
| 10 | 03851 | Milton | — | — | $283K | |
| 11 | 03852 | Milton Mills | — | — | $331K | |
| 12 | 03855 | New Durham | — | — | $307K | |
| 13 | 03861 | Lee | — | — | $449K | |
| 14 | 03866 | Rochester | — | — | — | |
| 15 | 03867 | Rochester | — | — | 2 (1 health) | $259K |
| 16 | 03868 | Rochester | — | — | 2 (1 health) | $259K |
| 17 | 03869 | Rollinsford | — | — | 4 (2 health) | $363K |
| 18 | 03878 | Somersworth | — | — | 0 | $295K |
| 19 | 03884 | Strafford | — | — | $402K | |
| 20 | 03887 | Union | — | — | $261K |
Recommended Buyer Guides for Strafford County
Below: editorial picks, no sponsored placements.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 60.6% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Strafford County, New Hampshire
Overview
Strafford County in New Hampshire covers 20 tracked ZIP records. No Home Safety Score is published because the required model evidence is incomplete for every tracked record; missing evidence is not treated as zero.
6 of 10 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 3 health-based violations appear in the available health breakdown.
← Back to New Hampshire 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.