Addison County, Vermont
15 ZIP codes · Avg score 73/100 · Grade B · Updated 2026-06-03
Across Addison County's 15 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 Addison County Compares
How Addison County Compares
Addison County scores 2 points above the Vermont state average (71/100) and 5 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Addison County, Vermont
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.2 (asthma 10.8%, diabetes 8.2%)
Estimated additional annual cost per homeowner: $911, driven primarily by energy_code_gap
Infrastructure: 0.424% avg pipe failure probability, 64% of ZIPs at high risk
63.5% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
→ Stable trendEPA violation counts by year across Addison County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 1 violation. Past 5 years: 2 total (2 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
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $911
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
15,433 housing units in Addison 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 Addison County
Remediation costs are relatively manageable for most homeowners in Addison 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 Addison 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 Addison County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | STARKSBORO VILLAGE WATER COOP | 350 | 12 |
| 2 | Tri Town Water District | 3,800 | 11 |
| 3 | Lazy Brook Mhp | 205 | 10 |
| 4 | Brookside Mhp | 135 | 10 |
| 5 | Middlebury Water Department | 9,379 | 8 |
13 total water systems serve Addison County.
All ZIP Codes in Addison County
15 ZIP codes tracked in Addison County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 5734 | Bridport | 83 | B | 0 | $327K |
| 2 | 5770 | Shoreham | 83 | B | 1 | $291K |
| 3 | 5669 | Roxbury | 82 | B | 1 (1 health) | $248K |
| 4 | 5740 | East Middlebury | 82 | B | 2 | — |
| 5 | 5778 | Whiting | 82 | B | 2 | $272K |
| 6 | 5491 | Vergennes | 80 | B | 4 | $306K |
| 7 | 5487 | Starksboro | 79 | B | 6 | $241K |
| 8 | 5748 | Hancock | 76 | B | 1 | $187K |
| 9 | 5443 | Bristol | 72 | B | 6 | $336K |
| 10 | 5753 | Middlebury | 72 | B | 4 | $383K |
| 11 | 5456 | Ferrisburgh | 63 | C | 0 | $419K |
| 12 | 5469 | Monkton | 63 | C | 0 | — |
| 13 | 5766 | Ripton | 63 | C | 0 | $330K |
| 14 | 5472 | New Haven | 55 | C | 0 | $345K |
| 15 | 5769 | Salisbury | 53 | D | 0 | $348K |
Recommended Buyer Guides for Addison County
Strictly editorial — no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- Best Lead Paint Test Kits — 63.5% of homes built before 1978
Deep Dive Reports
Detailed analysis for Addison County, Vermont
Overview
Addison County in Vermont covers 15 ZIP codes with an average Home Safety Score of B (73/100).
9 of 15 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.