Merrimack County, New Hampshire
31 ZIP codes · Avg score 78/100 · Grade B
ZipCheckup grade for Merrimack County: B.
This ZIP has a few items worth a quick check.
Merrimack County earns an A or B, the top two of ZipCheckup's five grades, based on the average composite Home Safety Score of its scored ZIP codes. That composite can draw on drinking water records, radon zones, PFAS monitoring and air quality data, so a strong grade summarizes several sources and is not a reading from anyone's tap. Scores also vary from one ZIP code to another, and the 31 ZIP reports listed for the county show where each one stands.
How Merrimack County Compares
How Merrimack County Compares
Merrimack County scores 4 points above the New Hampshire state average (74/100) and 5 points above 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: Merrimack 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: 11.8 (asthma 11%, diabetes 9.1%)
Modeled additional annual cost estimate per homeowner: $1,239, largest modeled factor: Flood
56% of homes built before 1980 (lead paint was banned for residential use in 1978)
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: $1,239
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
65,348 housing units in Merrimack 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 Merrimack County
Modeled remediation costs in Merrimack 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 Merrimack County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Merrimack County ZIP codes
8 community water systems mapped to Merrimack County ZIP codes; EPA may list more systems serving the county.
- C
- B
- B
- C
- C
- B
Show all 8 water systems
- B
16 water systems mapped to Merrimack County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in Merrimack County
3 water systems with violations in EPA records.
- B
- C
All ZIP Codes in Merrimack County
31 ZIP codes tracked in Merrimack County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 03235 | Franklin | 83 | B | 0 | $245K |
| 2 | 03257 | New London | 83 | B | 0 | $469K |
| 3 | 03301 | Concord | 83 | B | 0 | $344K |
| 4 | 03303 | Concord | 83 | B | 0 | $274K |
| 5 | 03229 | Contoocook | 81 | B | 21 (20 health) | $441K |
| 6 | 03106 | Hooksett | 67 | C | 0 | $372K |
| 7 | 03275 | Suncook | 66 | C | 1 | $309K |
| 8 | 03034 | Candia | — | — | $395K | |
| 9 | 03046 | Dunbarton | — | — | $437K | |
| 10 | 03216 | Andover | — | — | $332K | |
| 11 | 03221 | Bradford | — | — | $302K | |
| 12 | 03224 | Canterbury | — | — | $410K | |
| 13 | 03230 | Danbury | — | — | $213K | |
| 14 | 03231 | East Andover | — | — | — | |
| 15 | 03233 | Elkins | — | — | $397K | |
| 16 | 03234 | Epsom | — | — | 0 | $298K |
| 17 | 03242 | Henniker | — | — | 0 | $318K |
| 18 | 03243 | Hill | — | — | $243K | |
| 19 | 03255 | Newbury | — | — | $441K | |
| 20 | 03258 | Chichester | — | — | $360K | |
| 21 | 03260 | North Sutton | — | — | $297K | |
| 22 | 03263 | Pittsfield | — | — | 0 | $271K |
| 23 | 03268 | Salisbury | — | — | $313K | |
| 24 | 03272 | South Newbury | — | — | — | |
| 25 | 03273 | South Sutton | — | — | $277K | |
| 26 | 03278 | Warner | — | — | $323K | |
| 27 | 03287 | Wilmot | — | — | $373K | |
| 28 | 03302 | Concord | — | — | — | |
| 29 | 03304 | Bow | — | — | 3 (3 health) | $444K |
| 30 | 03305 | Concord | — | — | — | |
| 31 | 03307 | Loudon | — | — | $316K |
Recommended Buyer Guides for Merrimack County
Each guide below is listed with the reason it appears.
- Best Lead Paint Test Kits — 56% of homes built before 1980
- 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 Merrimack County, New Hampshire
Overview
Merrimack County in New Hampshire covers 31 tracked ZIP records with an average Home Safety Score of B (78/100) across 7 scored records.
3 of 11 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 23 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.