Grand Isle County, Vermont
5 ZIP codes · Avg score 86/100 · Grade A · Updated 2026-06-04
Recent water monitoring in Grand Isle County shows 5 ZIP codes with consistently safe results.
How Grand Isle County Compares
How Grand Isle County Compares
Grand Isle County scores 15 points above the Vermont state average (71/100) and 18 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Grand Isle County, Vermont
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.4 (asthma 10.9%, diabetes 9.7%)
Estimated additional annual cost per homeowner: $1,276, driven primarily by flood
Infrastructure: 0.412% avg pipe failure probability, 60% of ZIPs at high risk
57.4% 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: $1,276
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
5,264 housing units in Grand Isle 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 Grand Isle County
Remediation costs are relatively manageable for most homeowners in Grand Isle 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 Grand Isle County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Grand Isle County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Alburgh Village Water System | 576 | 10 |
| 2 | NORTH HERO WATER SYSTEM | 2,750 | 10 |
| 3 | South Alburgh Fire District 2 | 300 | 10 |
| 4 | Alburgh Fire District 1 | 87 | 10 |
| 5 | Grand Isle Consolidated Water District | 1,600 | 5 |
7 total water systems serve Grand Isle County.
All ZIP Codes in Grand Isle County
5 ZIP codes tracked in Grand Isle County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 5458 | Grand Isle | 94 | A | 2 | $381K |
| 2 | 5440 | Alburgh | 91 | A | 10 (1 health) | $240K |
| 3 | 5474 | North Hero | 90 | A | 0 | $404K |
| 4 | 5486 | South Hero | 87 | A | 3 | $508K |
| 5 | 5463 | Isle La Motte | 66 | C | 0 | $252K |
Recommended Buyer Guides for Grand Isle County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Lead Paint Test Kits — 57.4% of homes built before 1978
- 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 Grand Isle County, Vermont
Overview
Grand Isle County in Vermont covers 5 ZIP codes with an average Home Safety Score of A (86/100).
3 of 5 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← Back to Vermont 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.