Hancock County, Maine
47 ZIP codes · Avg score 52/100 · Grade D · Updated 2026-06-03
Water safety in Hancock County ranks low — 47 ZIP codes, persistent health-based violations on record.
How Hancock County Compares
How Hancock County Compares
Hancock County scores 5 points below the Maine state average (57/100) and 16 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Hancock County, Maine
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.3 (asthma 12.2%, diabetes 11.2%)
Estimated additional annual cost per homeowner: $1,027, driven primarily by sea_level
Infrastructure: 0.396% avg pipe failure probability, 45% of ZIPs at high risk
59.9% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Hancock County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 24 violations. Past 5 years: 82 total (82 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: $1,027
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
44,071 housing units in Hancock 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 Hancock County
Remediation costs are relatively manageable for most homeowners in Hancock 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 Hancock 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 Hancock County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Birch Tree Meadows Mhp | 105 | 49 |
| 2 | Sun Hancock Heights- East | 158 | 40 |
| 3 | Sun Hancock Heights-west | 155 | 40 |
| 4 | Indian Run Estates Llc | 103 | 40 |
| 5 | Unity by the Stream Llc | 88 | 40 |
38 total water systems serve Hancock County.
All ZIP Codes in Hancock County
47 ZIP codes tracked in Hancock County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 4627 | Deer Isle | 69 | C | 2 | $266K |
| 2 | 4609 | Bar Harbor | 68 | C | 9 (2 health) | $452K |
| 3 | 4429 | Holden | 67 | C | 16 (3 health) | $268K |
| 4 | 4421 | Castine | 66 | C | 9 (1 health) | $558K |
| 5 | 4476 | Penobscot | 65 | C | 3 | $261K |
| 6 | 4679 | Southwest Harbor | 65 | C | 4 | $418K |
| 7 | 4676 | Sedgwick | 63 | C | 1 | $280K |
| 8 | 4416 | Bucksport | 62 | C | 10 | $238K |
| 9 | 4634 | Franklin | 62 | C | 12 (3 health) | $236K |
| 10 | 4681 | Stonington | 62 | C | 11 (5 health) | $213K |
| 11 | 4420 | Castine | 61 | C | 9 (1 health) | — |
| 12 | 4662 | Northeast Harbor | 61 | C | 10 | $607K |
| 13 | 4693 | Winter Harbor | 60 | C | 4 | $187K |
| 14 | 4660 | Mount Desert | 57 | C | 10 | $475K |
| 15 | 4684 | Surry | 56 | C | 11 (5 health) | $278K |
| 16 | 4605 | Ellsworth | 55 | C | 22 (6 health) | $231K |
| 17 | 4431 | East Orland | 53 | D | 0 | — |
| 18 | 4472 | Orland | 53 | D | 0 | $261K |
| 19 | 4607 | Gouldsboro | 53 | D | 0 | $242K |
| 20 | 4612 | Bernard | 53 | D | 0 | $379K |
| 21 | 4613 | Birch Harbor | 53 | D | 0 | — |
| 22 | 4617 | Brooksville | 53 | D | 0 | $359K |
| 23 | 4624 | Corea | 53 | D | 0 | $371K |
| 24 | 4625 | Cranberry Isles | 53 | D | 0 | $400K |
| 25 | 4646 | Islesford | 53 | D | 0 | $403K |
| 26 | 4650 | Little Deer Isle | 53 | D | 0 | $334K |
| 27 | 4653 | Bass Harbor | 53 | D | 0 | $335K |
| 28 | 4673 | Sargentville | 53 | D | 0 | $288K |
| 29 | 4675 | Seal Harbor | 53 | D | 0 | $529K |
| 30 | 4685 | Swans Island | 53 | D | 0 | $316K |
| 31 | 4411 | Bradley | 45 | D | 0 | $191K |
| 32 | 4461 | Milford | 45 | D | 0 | $183K |
| 33 | 4640 | Hancock | 45 | D | 40 (14 health) | $238K |
| 34 | 4614 | Blue Hill | 42 | D | 13 (3 health) | $333K |
| 35 | 4616 | Brooklin | 40 | D | 0 | $314K |
| 36 | 4629 | East Blue Hill | 40 | D | 0 | — |
| 37 | 4635 | Frenchboro | 40 | D | 0 | — |
| 38 | 4642 | Harborside | 40 | D | 0 | — |
| 39 | 4644 | Hulls Cove | 40 | D | 0 | — |
| 40 | 4645 | Isle Au Haut | 40 | D | 0 | $663K |
| 41 | 4669 | Prospect Harbor | 40 | D | 0 | $261K |
| 42 | 4672 | Salsbury Cove | 40 | D | 0 | — |
| 43 | 4674 | Seal Cove | 40 | D | 0 | $306K |
| 44 | 4683 | Sunset | 40 | D | 0 | — |
| 45 | 4987 | Troy | 40 | D | 0 | $194K |
| 46 | 4664 | Sullivan | 33 | F | 13 (11 health) | $209K |
| 47 | 4677 | Sorrento | 33 | F | 13 (11 health) | $266K |
Recommended Buyer Guides for Hancock 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 Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 59.9% 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
Deep Dive Reports
Detailed analysis for Hancock County, Maine
Overview
Hancock County in Maine covers 47 ZIP codes with an average Home Safety Score of D (52/100).
20 of 47 ZIP codes have recorded EPA violations. 65 health-based violations have been documented.
← Back to Maine 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
Hancock 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
59.9% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.