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2026 Rankings
Merrimack County, New Hampshire Home Safety Rankings - 29 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.
Merrimack County, New Hampshire (New Hampshire) includes 29 tracked ZIP codes and 13 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: B (80/100)
| Grade | ZIP Codes | % |
|---|---|---|
| A | 0 | 0% |
| B | 5 | 83% |
| C | 1 | 17% |
| D | 0 | 0% |
| F | 0 | 0% |
Top 10 ZIP Codes by Home Safety Score
| Rank | ZIP | City | Score | Grade |
|---|---|---|---|---|
| 1 | 03235 | Franklin | 83 | B |
| 2 | 03257 | New London | 83 | B |
| 3 | 03301 | Concord | 83 | B |
| 4 | 03303 | Concord | 83 | B |
| 5 | 03229 | Contoocook | 81 | B |
| 6 | 03106 | Hooksett | 67 | C |
10 Riskiest ZIP Codes
| Rank | ZIP | City | Score | Grade | Risk Factor |
|---|---|---|---|---|---|
| 1 | 03106 | Hooksett | 67 | C | — |
| 2 | 03229 | Contoocook | 81 | B | 21 violations |
| 3 | 03303 | Concord | 83 | B | — |
| 4 | 03301 | Concord | 83 | B | — |
| 5 | 03257 | New London | 83 | B | — |
| 6 | 03235 | Franklin | 83 | B | — |
Most Common Contaminant Violations
| Contaminant | Violations | ZIPs Affected |
|---|---|---|
| Total Trihalomethanes (TTHM) | 13 | 2 |
| Haloacetic Acids (HAA5) | 8 | 2 |
| Barium | 4 | 2 |
| E. coli | 1 | 1 |
| Long Term 2 Enhanced Surface Water Treatment Rule | 1 | 1 |
Lead Risk
- Average of reported 90th-percentile lead results: 0.0015 mg/L (below EPA action level)
- 0 of 4 ZIP codes with known status exceed EPA lead action level
- 27% of housing built before 1950
- 39% of housing built before 1970
Cities in This Metro
- Concord, NH — 4 ZIP codes
- Epping, NH — 1 ZIP code
- Dunbarton, NH — 1 ZIP code
- Hooksett, NH — 1 ZIP code
- Andover, NH — 1 ZIP code
- Bradford, NH — 1 ZIP code
- Canterbury, NH — 1 ZIP code
- Contoocook, NH — 1 ZIP code
- Danbury, NH — 1 ZIP code
- East Andover, NH — 1 ZIP code
- Elkins, NH — 1 ZIP code
- Franklin, NH — 1 ZIP code
- Newbury, NH — 1 ZIP code
- New London, NH — 1 ZIP code
- Chichester, NH — 1 ZIP code
- North Sutton, NH — 1 ZIP code
- Pittsfield, NH — 1 ZIP code
- Salisbury, NH — 1 ZIP code
- South Newbury, NH — 1 ZIP code
- South Sutton, NH — 1 ZIP code
- Warner, NH — 1 ZIP code
- Washington, NH — 1 ZIP code
- Weare, NH — 1 ZIP code
- Wilmot, NH — 1 ZIP code
- Bow, NH — 1 ZIP code
- Loudon, NH — 1 ZIP code
All 29 ZIP Codes Ranked
View complete ranking
| Rank | ZIP | City | Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 03235 | Franklin | 83 | B | 0 |
| 2 | 03257 | New London | 83 | B | 0 |
| 3 | 03301 | Concord | 83 | B | 0 |
| 4 | 03303 | Concord | 83 | B | 0 |
| 5 | 03229 | Contoocook | 81 | B | 21 |
| 6 | 03106 | Hooksett | 67 | C | 0 |
| 7 | 03042 | Epping | — | — | 3 |
| 8 | 03046 | Dunbarton | — | — | — |
| 9 | 03216 | Andover | — | — | — |
| 10 | 03221 | Bradford | — | — | — |
| 11 | 03224 | Canterbury | — | — | — |
| 12 | 03230 | Danbury | — | — | — |
| 13 | 03231 | East Andover | — | — | — |
| 14 | 03233 | Elkins | — | — | — |
| 15 | 03255 | Newbury | — | — | — |
| 16 | 03258 | Chichester | — | — | — |
| 17 | 03260 | North Sutton | — | — | — |
| 18 | 03263 | Pittsfield | — | — | 0 |
| 19 | 03268 | Salisbury | — | — | — |
| 20 | 03273 | South Sutton | — | — | — |
| 21 | 03278 | Warner | — | — | — |
| 22 | 03280 | Washington | — | — | — |
| 23 | 03281 | Weare | — | — | — |
| 24 | 03287 | Wilmot | — | — | — |
| 25 | 03304 | Bow | — | — | 3 |
| 26 | 03307 | Loudon | — | — | — |
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 →
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). Merrimack County, New Hampshire Home Safety Rankings - 29 ZIPs. https://zipcheckup.com/rankings/metro/merrimack-new-hampshire/
BibTeX
@misc{zipcheckup-rankings-metro-merrimack-new-hampshire,
author = {{ZipCheckup}},
title = {{Merrimack County, New Hampshire Home Safety Rankings - 29 ZIPs}},
year = {2026},
url = {https://zipcheckup.com/rankings/metro/merrimack-new-hampshire/}
}
Page version: October 2026.
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