Carroll County, New Hampshire
32 ZIP codes · Avg score 45/100 · Grade D · Updated 2026-07-19
ZipCheckup grade for Carroll: D.
Several federal signals point to home-safety risks in this ZIP.
Your top priority: see the breakdown below and consider a certified water filter. NSF certified filters →
Unlike better-scoring counties, Carroll County records health-based violations across a meaningful portion of its 32 ZIP codes - the overall safety grade is well below average.
How Carroll County Compares
How Carroll County Compares
Carroll County scores 19 points below the New Hampshire state average (64/100) and 23 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-07-19
ZIP Code Risk Map
Water Quality Map: Carroll 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%, diabetes 10.6%)
Estimated additional annual cost per homeowner: $1,293, driven primarily by flood
Infrastructure: 0.456% avg pipe failure probability, 81% of ZIPs at high risk
65.7% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Carroll County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 27 violations. Past 5 years: 84 total (84 health-based). Health-based violations are rising versus the prior 2-year window - worth closer monitoring.
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
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,293
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
41,448 housing units in Carroll 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 Carroll County
Remediation costs are relatively manageable for most homeowners in Carroll 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 Carroll County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Carroll County
8 community water systems serving Carroll County.
- D
- D
- C
- D
- C
- D
Show all 8 water systems
- D
- D
60 total water systems serve Carroll County.
Systems with the most violations in Carroll County
5 water systems with recorded EPA violations.
- D
- D
- D
- D
- D
All ZIP Codes in Carroll County
32 ZIP codes tracked in Carroll County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 03845 | Intervale | 69 | C | 3 (1 health) | $299K |
| 2 | 03894 | Wolfeboro | 69 | C | 2 (1 health) | $435K |
| 3 | 03860 | North Conway | 63 | C | 4 | $329K |
| 4 | 03836 | Freedom | 61 | C | 2 | $370K |
| 5 | 03812 | Bartlett | 60 | C | 11 (5 health) | $346K |
| 6 | 03818 | Conway | 59 | C | 6 (1 health) | $284K |
| 7 | 03846 | Jackson | 59 | C | 4 (3 health) | $673K |
| 8 | 03817 | Chocorua | 53 | D | 3 (2 health) | $352K |
| 9 | 03830 | East Wakefield | 53 | D | 0 | $313K |
| 10 | 03883 | South Tamworth | 53 | D | 0 | $339K |
| 11 | 03882 | Effingham | 51 | D | 11 (3 health) | $277K |
| 12 | 03872 | Sanbornville | 50 | D | 2 (1 health) | $320K |
| 13 | 03813 | Center Conway | 45 | D | 1 | $215K |
| 14 | 03840 | Greenland | 45 | D | 0 | $595K |
| 15 | 03890 | West Ossipee | 45 | D | 0 | — |
| 16 | 03886 | Tamworth | 43 | D | 7 (2 health) | $361K |
| 17 | 03254 | Moultonborough | 41 | D | 12 (4 health) | $517K |
| 18 | 03227 | Center Sandwich | 40 | D | 0 | $387K |
| 19 | 03259 | North Sandwich | 40 | D | 0 | $372K |
| 20 | 03832 | Eaton Center | 40 | D | 0 | $348K |
| 21 | 03847 | Kearsarge | 40 | D | 0 | $412K |
| 22 | 03850 | Melvin Village | 40 | D | 0 | $424K |
| 23 | 03852 | Milton Mills | 40 | D | 0 | $331K |
| 24 | 03853 | Mirror Lake | 40 | D | 0 | $518K |
| 25 | 03875 | Silver Lake | 40 | D | 0 | $387K |
| 26 | 03896 | Wolfeboro Falls | 40 | D | 0 | — |
| 27 | 03897 | Wonalancet | 40 | D | 0 | — |
| 28 | 03864 | Ossipee | 38 | F | 4 | $252K |
| 29 | 03814 | Center Ossipee | 34 | F | 3 | $316K |
| 30 | 03816 | Center Tuftonboro | 31 | F | 5 (2 health) | $401K |
| 31 | 03838 | Glen | 15 | F | 27 (21 health) | $401K |
| 32 | 03849 | Madison | 12 | F | 8 (5 health) | $359K |
Recommended Buyer Guides for Carroll County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Water Filters for Lead — Lead above EPA action level in 8 ZIP codes
- Best Lead Paint Test Kits — 65.7% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
Deep Dive Reports
Detailed analysis for Carroll County, New Hampshire
Overview
Carroll County in New Hampshire covers 32 ZIP codes with an average Home Safety Score of D (45/100).
18 of 32 ZIP codes have recorded EPA violations. 51 health-based violations have been documented.
← Back to New Hampshire water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.
What You Can Do
Carroll County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
65.7% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.