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2026 Rankings

Strafford County, New Hampshire Home Safety Rankings - 23 ZIPs

Explore rankings under Home Safety Score model 4.0.0. Only ZIPs with all four required inputs are ranked; missing evidence is not imputed or reweighted.

Strafford County, New Hampshire (New Hampshire) includes 23 tracked ZIP codes and 17 mapped community water systems; confirm service for a specific address. Below are the water quality rankings for metro ZIPs with all required inputs.

Average Home Safety Grade: C (66/100)

Grade	ZIP Codes	%
A	0	0%
B	0	0%
C	1	100%
D	0	0%
F	0	0%

Top 10 ZIP Codes by Home Safety Score

Rank	ZIP	City	Score	Grade
1	03087	Windham	66	C

10 Riskiest ZIP Codes

Rank	ZIP	City	Score	Grade	Risk Factor
1	03087	Windham	66	C	2 violation(s)

Most Common Contaminant Violations

Contaminant	Violations	ZIPs Affected
Total Trihalomethanes (TTHM)	4	4
Stage 1 DBP Rule	4	3
Bromate	2	1
Total Coliform	2	2
Haloacetic Acids (HAA5)	1	1

Lead Risk

Average of reported 90th-percentile lead results: 0.0085 mg/L (below EPA action level)
1 of 9 ZIP codes with known status exceed EPA lead action level
22% of housing built before 1950
38% of housing built before 1970

Cities in This Metro

Rochester, NH — 4 ZIP codes
Dover, NH — 3 ZIP codes
Windham, NH — 1 ZIP code
Epsom, NH — 1 ZIP code
Northwood, NH — 1 ZIP code
West Nottingham, NH — 1 ZIP code
Center Strafford, NH — 1 ZIP code
Madbury, NH — 1 ZIP code
Durham, NH — 1 ZIP code
Barrington, NH — 1 ZIP code
Farmington, NH — 1 ZIP code
Milton, NH — 1 ZIP code
New Durham, NH — 1 ZIP code
Lee, NH — 1 ZIP code
Rollinsford, NH — 1 ZIP code
Somersworth, NH — 1 ZIP code
Strafford, NH — 1 ZIP code
Union, NH — 1 ZIP code

All 23 ZIP Codes Ranked

View complete ranking

Rank	ZIP	City	Score	Grade	Violations
1	03087	Windham	66	C	2
2	03234	Epsom	—	—	0
3	03261	Northwood	—	—	—
4	03820	Dover	—	—	1
5	03823	Madbury	—	—	1
6	03824	Durham	—	—	0
7	03825	Barrington	—	—	0
8	03835	Farmington	—	—	0
9	03839	Rochester	—	—	1
10	03851	Milton	—	—	—
11	03855	New Durham	—	—	—
12	03861	Lee	—	—	—
13	03867	Rochester	—	—	2
14	03868	Rochester	—	—	2
15	03869	Rollinsford	—	—	4
16	03878	Somersworth	—	—	0
17	03884	Strafford	—	—	—
18	03887	Union	—	—	—

Data Sources

Water quality: EPA SDWIS
Housing: U.S. Census Bureau American Community Survey
Flood: FEMA NFIP
Flood scope: historical NFIP claim records and claim-rated-zone evidence; this is not current property-map coverage.

Reporting periods vary by source; the page metadata identifies this materialization.

Methodology
Model 4.0.0 averages SDWIS water compliance and UCMR5 PFAS within drinking water, then averages drinking water, county radon, and annual AQI as three equal domains. All four inputs are required. Score methodology → · Rankings methodology →

Disclaimer: Scores are based on EPA SDWIS reported data and are not a guarantee of current water safety. Water quality can change. For the most current information, contact your local water utility or request a Consumer Confidence Report.

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How to cite this page

APA

ZipCheckup. (2026). Strafford County, New Hampshire Home Safety Rankings - 23 ZIPs. https://zipcheckup.com/rankings/metro/strafford-new-hampshire/

BibTeX

@misc{zipcheckup-rankings-metro-strafford-new-hampshire,
  author = {{ZipCheckup}},
  title  = {{Strafford County, New Hampshire Home Safety Rankings - 23 ZIPs}},
  year   = {2026},
  url    = {https://zipcheckup.com/rankings/metro/strafford-new-hampshire/}
}

Page version: October 2026.

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