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Hancock County, Maine — public water systems

At a glance

203 active public water systems are filed under Hancock County, Maine in EPA's SDWIS records, together reporting 47,019 people served. The largest is Town of Bar Harbor- Water Division, which reports serving 4,443 people. 30 are community water systems serving people where they live; the other 173 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

203

Population served

47K

Community systems

30

Groundwater share

95.1%

How does Hancock County compare with other Maine counties?

Hancock County has the 2nd-most active public water systems among the 17 counties listed for active Maine systems in EPA records; among the 16 with 3 or more systems, the median has 105. Its systems report 47,019 people served in total, the 6th-largest county figure in the state and 5% of the statewide total. The average system here reports serving 232 people, about half of the Maine average of 503. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.

Where does Hancock County's drinking water come from?

By primary water source, Hancock County's active systems draw on groundwater (192, 95%), surface water (8, 3.9%), purchased surface water (2, 1%) and groundwater under influence of surface water (1, 0.5%). Overall, 95% rely mainly on groundwater (including purchased groundwater) and 4.9% on surface water, compared with 96% and 3.7% across Maine. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Town of Bar Harbor- Water Division, draws primarily on surface water.

What kinds of water systems operate in Hancock County?

Hancock County's active systems break down as 30 community systems (15%), 42 non-transient non-community systems (21%) and 131 transient non-community systems (65%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (77%), local government (15%), federal government (6.4%) and state government (1.5%).

The 50 largest water systems in Hancock County

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Active public water systems in Hancock County, Maine
#Water systemCountyPopulation servedTypeSource
1Town of Bar Harbor- Water DivisionHancock4,443CommunitySurface water
2Ellsworth Water DepartmentHancock3,910CommunitySurface water
3Southwest Harbor Water & Sewer DistrictHancock2,480CommunitySurface water
4Maine Water Company Bucksport DivisionHancock1,700CommunitySurface water
5Mount Desert Water Dist NorthHancock1,623CommunitySurface water
6Castine Water DepartmentHancock983CommunityGroundwater under influence of surface water
7Us Nps Jordan Pond Hse (18)Hancock888Transient non-communityGroundwater
8Mount Desert Water Dist -SealHancock865CommunitySurface water
9Asticou InnHancock760Transient non-communityGroundwater
10Winter Harbor Water DistrictHancock700CommunityGroundwater
11Stonington Water CompanyHancock683CommunityGroundwater
12Aos 91 Mt Desert Island High SchoolHancock615Non-transient non-communityGroundwater
13Timberland Acres CampgroundHancock565Transient non-communityGroundwater
14Narrows Too CampgroundHancock525Transient non-communityGroundwater
15Hadleys Point CampgroundHancock505Transient non-communityGroundwater
16Us Nps Sieur De Monts (2)Hancock500Transient non-communityGroundwater
17Us Nps Cadillac Mtn (8)Hancock500Transient non-communityGroundwater
18Mt Desert Narrows CampgroundHancock499Transient non-communityGroundwater
19Blaze Blue HillHancock450Transient non-communityGroundwater
20Franklin Water DepartmentHancock443CommunityGroundwater
21Patten Pond Camping ResortHancock430Transient non-communityGroundwater
22Lucerne InnHancock422Transient non-communityGroundwater
23Northern Light Blue HillHancock409Non-transient non-communityGroundwater
24Bar Harbor Koa Oceanside-West SideHancock401Transient non-communityGroundwater
25Big Cats Catering-Tiny Tykes DaycareHancock383Non-transient non-communityGroundwater
26Mount Desert CampgroundHancock375Transient non-communityGroundwater
27Camp Beech CliffHancock350Transient non-communityGroundwater
28Msu 93 Blue Hill Consolidated SchoolHancock319Non-transient non-communityGroundwater
29Bunkers Seafood and SpiritsHancock319Transient non-communityGroundwater
30Blue Hill Public LibraryHancock318Transient non-communityGroundwater
31Balsam Cove CampgroundHancock314Transient non-communityGroundwater
32Lawrence Family Fitness CenterHancock309Transient non-communityGroundwater
33Long Pond Water DistrictHancock308CommunitySurface water
34George Stevens AcademyHancock308Non-transient non-communityGroundwater
35Cold Spring Water CompanyHancock305CommunityGroundwater
36Bass Harbor CampgroundHancock305Transient non-communityGroundwater
37Abels Lobster PoundHancock301Transient non-communityGroundwater
38Hancock Pour HouseHancock300Transient non-communityGroundwater
39Arborvine Restaurant & BreweryHancock296Transient non-communityGroundwater
40Terramor Outdoor ResortHancock292Transient non-communityGroundwater
41Smugglers DenHancock289Transient non-communityGroundwater
42Msu 76 Deer Isle/Stonington K-8 SchoolHancock286Non-transient non-communityGroundwater
43Causeway Club Inc.Hancock270Transient non-communityGroundwater
44The Pickled WrinkleHancock267Transient non-communityGroundwater
45Us Nps Schoodic Woods CampgroundHancock264Transient non-communityGroundwater
46Marlintinis Grill Inc.Hancock252Transient non-communityGroundwater
47Us Nps Echo Lake (12)Hancock250Transient non-communityGroundwater
48Islesford Dock RestaurantHancock240Transient non-communityGroundwater
49Camp JordanHancock235Transient non-communityGroundwater
50Aragosta at Goose CoveHancock226Transient non-communityGroundwater

All other water systems in Hancock County (153)

The remaining active systems filed under Hancock County, largest first, with the population each reports serving.

Hancock County water systems: frequently asked questions

How many public water systems are in Hancock County, Maine?

EPA's SDWIS records file 203 active public water systems under Hancock County, Maine: 30 community systems (15%), 42 non-transient non-community systems (21%) and 131 transient non-community systems (65%).

Who supplies drinking water in Hancock County, ME?

The largest community water systems filed under Hancock County are Town of Bar Harbor- Water Division (4,443 people served), Ellsworth Water Department (3,910 people served) and Southwest Harbor Water & Sewer District (2,480 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.

Does Hancock County's drinking water come from groundwater or surface water?

Of the 203 active public water systems in Hancock County, 95% draw mainly on groundwater and 4.9% on surface water, counting purchased supplies. The largest system, Town of Bar Harbor- Water Division, uses surface water.

Where can I find a water quality report for Hancock County?

Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 30 community systems are filed under Hancock County, so the report to look for is the one from the system that supplies your address.

How can I check violations for a water system in Hancock County?

Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.

More Maine water systems

About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Public water systems in Hancock County, Maine”, https://aquacensus.com/water-systems/maine/hancock (data as of October 1, 2026).