Dukes County, Massachusetts
7 ZIP codes · Avg score 68/100 · Grade C · Updated 2026-06-03
Across Dukes County's 7 ZIP codes, water safety results are uneven — a portion of systems carry active or recent violations, while others meet standards without issues.
How Dukes County Compares
How Dukes County Compares
Dukes County scores 2 points above the Massachusetts state average (66/100) and 0 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Dukes County, Massachusetts
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.3 (asthma 11.5%, diabetes 10.6%)
Estimated additional annual cost per homeowner: $1,566, driven primarily by flood
Infrastructure: 0.412% avg pipe failure probability, 50% of ZIPs at high risk
63.8% 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: $1,566
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
17,584 housing units in Dukes 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 Dukes County
Remediation costs are relatively manageable for most homeowners in Dukes 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 Dukes 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 Dukes County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Menemsha Water Company | 841 | 3 |
| 2 | KUEHNS WAY LLC | 80 | 1 |
| 3 | Scotts Grove Llc | 36 | 1 |
| 4 | Edgartown Water Department | 8,027 | 0 |
| 5 | Oak Bluffs Water District | 24,000 | 0 |
All ZIP Codes in Dukes County
7 ZIP codes tracked in Dukes County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 2575 | West Tisbury | 83 | B | 1 | $1183K |
| 2 | 2535 | Chilmark | 75 | B | 3 | $1805K |
| 3 | 2557 | Oak Bluffs | 73 | B | 0 | $1006K |
| 4 | 2539 | Edgartown | 71 | B | 0 | $1172K |
| 5 | 2713 | Cuttyhunk | 63 | C | 0 | $700K |
| 6 | 2568 | Vineyard Haven | 55 | C | 0 | $911K |
| 7 | 2552 | Menemsha | 53 | D | 0 | — |
Recommended Buyer Guides for Dukes County
Independent picks. EPA-grounded. Matched here.
- Best Lead Paint Test Kits — 63.8% 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 Dukes County, Massachusetts
Overview
Dukes County in Massachusetts covers 7 ZIP codes with an average Home Safety Score of C (68/100).
2 of 7 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Massachusetts 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.