Belknap County, New Hampshire
19 ZIP codes · Avg score 82/100 · Grade B · Updated
ZipCheckup grade for Belknap County: B.
This ZIP looks solid, with a few items worth a quick check.
Across Belknap County's 19 ZIP codes, EPA compliance data shows above-average performance - violation rates are minimal, none of the county's systems have triggered health-based MCL exceedances in recent cycles, and the county's scores have stayed above the national baseline across every recent reporting period.
How Belknap County Compares
How Belknap County Compares
Belknap County scores 8 points above the New Hampshire state average (74/100) and 9 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 Last verified:
ZIP Code Risk Map
Water Quality Map: Belknap 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: 12.8 (asthma 10.3%, diabetes 10.5%)
Estimated additional annual cost per homeowner: $1,244, driven primarily by sea_level
60.1% of homes built before 1978 (lead paint era)
Violation History (2021–2023)
→ Stable trendEPA violation counts by year across Belknap County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 4 violations. Past 5 years: 8 total (8 health-based).
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: $1,244
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
40,498 housing units in Belknap 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 Belknap County
Remediation costs are relatively manageable for most homeowners in Belknap 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 Belknap County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Belknap County
8 community water systems serving Belknap County.
- B
Show all 8 water systems
- B
12 total water systems serve Belknap County.
Systems with the most violations in Belknap County
5 water systems with recorded EPA violations.
- B
- B
All ZIP Codes in Belknap County
19 ZIP codes tracked in Belknap County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 03246 | Laconia | 82 | B | 5 | $308K |
| 2 | 03218 | Barnstead | — | — | 0 | $305K |
| 3 | 03220 | Belmont | — | — | 0 | $265K |
| 4 | 03225 | Center Barnstead | — | — | 0 | $309K |
| 5 | 03226 | Center Harbor | — | — | $388K | |
| 6 | 03237 | Gilmanton | — | — | $318K | |
| 7 | 03247 | Laconia | — | — | — | |
| 8 | 03249 | Gilford | — | — | 15 (1 health) | $389K |
| 9 | 03252 | Lochmere | — | — | — | |
| 10 | 03253 | Meredith | — | — | 6 (3 health) | $445K |
| 11 | 03256 | New Hampton | — | — | $363K | |
| 12 | 03269 | Sanbornton | — | — | $393K | |
| 13 | 03276 | Tilton | — | — | 1 | $246K |
| 14 | 03289 | Winnisquam | — | — | — | |
| 15 | 03298 | Tilton | — | — | — | |
| 16 | 03299 | Tilton | — | — | — | |
| 17 | 03809 | Alton | — | — | 1 | $332K |
| 18 | 03810 | Alton Bay | — | — | 1 | $573K |
| 19 | 03837 | Gilmanton Iron Works | — | — | $366K |
Recommended Buyer Guides for Belknap County
Editorial-only picks, screened against the EPA detections on file.
- Best Water Filters for Lead — Lead above EPA action level in 3 ZIP codes
- Best Lead Paint Test Kits — 60.1% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Belknap County, New Hampshire
Overview
Belknap County in New Hampshire covers 19 tracked ZIP records with an average Home Safety Score of B (82/100) across 1 scored records.
6 of 9 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 4 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.