Sullivan County, New Hampshire
13 ZIP codes · Avg score 63/100 · Grade C · Updated 2026-07-19
ZipCheckup grade for Sullivan: C.
A mixed picture - some signals here are worth your attention.
Safe water is the norm for most of Sullivan County's 13 ZIP codes - but a notable subset have documented violations that push the grade to the middle tier.
How Sullivan County Compares
How Sullivan County Compares
Sullivan County scores 1 points below the New Hampshire state average (64/100) and 5 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-07-19
ZIP Code Risk Map
Water Quality Map: Sullivan 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: 13 (asthma 10.7%, diabetes 10.9%)
Estimated additional annual cost per homeowner: $1,448, driven primarily by energy_code_gap
Infrastructure: 0.466% avg pipe failure probability, 64% of ZIPs at high risk
69.1% of homes built before 1978 (lead paint era)
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: $1,448
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
18,934 housing units in Sullivan 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 Sullivan County
Remediation costs are relatively manageable for most homeowners in Sullivan 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 Sullivan County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Sullivan County
8 community water systems serving Sullivan County.
- B
- D
- D
- C
- B
- D
Show all 8 water systems
- B
- B
17 total water systems serve Sullivan County.
Systems with the most violations in Sullivan County
5 water systems with recorded EPA violations.
- D
- D
- B
- C
- B
All ZIP Codes in Sullivan County
13 ZIP codes tracked in Sullivan County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 03743 | Claremont | 77 | B | 1 (1 health) | $173K |
| 2 | 03753 | Grantham | 76 | B | 4 | $352K |
| 3 | 03781 | Plainfield | 75 | B | 0 | $390K |
| 4 | 03782 | Sunapee | 75 | B | 0 | $377K |
| 5 | 03770 | Meriden | 72 | B | 1 | $529K |
| 6 | 03752 | Goshen | 63 | C | 0 | $226K |
| 7 | 03603 | Charlestown | 58 | C | 1 | $182K |
| 8 | 03773 | Newport | 54 | D | 2 | $211K |
| 9 | 03284 | Springfield | 53 | D | 0 | $312K |
| 10 | 03609 | North Walpole | 53 | D | 0 | $188K |
| 11 | 03751 | Georges Mills | 53 | D | 0 | $249K |
| 12 | 03754 | Guild | 53 | D | 0 | — |
| 13 | 03769 | Lyme Center | 53 | D | 0 | — |
Recommended Buyer Guides for Sullivan County
Retailer arrangements don't shape what appears here - the selection logic is independent, filtered against EPA detections and the federal hazard data on file for this county.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 69.1% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Sullivan County, New Hampshire
Overview
Sullivan County in New Hampshire covers 13 ZIP codes with an average Home Safety Score of C (63/100).
5 of 13 ZIP codes have recorded EPA violations. 1 health-based violation 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.