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Waldo County, Maine — public water systems

At a glance

75 active public water systems are filed under Waldo County, Maine in EPA's SDWIS records, together reporting 19,252 people served. The largest is Belfast Water District, which reports serving 5,698 people. 18 are community water systems serving people where they live; the other 57 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

75

Population served

19.3K

Community systems

18

Groundwater share

100%

How does Waldo County compare with other Maine counties?

Waldo County has the 12th-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 19,252 people served in total, the 14th-largest county figure in the state and 2.1% of the statewide total. The average system here reports serving 257 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 Waldo County's drinking water come from?

By primary water source, Waldo County's active systems draw on groundwater (74, 99%) and purchased groundwater (1, 1.3%). Overall, all rely mainly on groundwater (including purchased groundwater) and none 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, Belfast Water District, draws primarily on groundwater.

What kinds of water systems operate in Waldo County?

Waldo County's active systems break down as 18 community systems (24%), 15 non-transient non-community systems (20%) and 42 transient non-community systems (56%). 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 (76%), local government (19%) and state government (5.3%).

The 50 largest water systems in Waldo County

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Active public water systems in Waldo County, Maine
#Water systemCountyPopulation servedTypeSource
1Belfast Water DistrictWaldo5,698CommunityGroundwater
2Searsport Water DistrictWaldo2,763CommunityGroundwater
3Rsu 03 Mt View SchoolWaldo1,100Non-transient non-communityGroundwater
4Winterport Water DistrictWaldo763CommunityGroundwater
5Fort KnoxWaldo592Transient non-communityGroundwater
6Northport Village Corp Water DeptWaldo550CommunityPurchased groundwater
7Bowens Pizzeria & Deli LLCWaldo450Transient non-communityGroundwater
8Mclaughlins Lobster ShackWaldo380Transient non-communityGroundwater
9Tarratine Yacht ClubWaldo362Transient non-communityGroundwater
10Penobscot Narrows ObservatoryWaldo326Transient non-communityGroundwater
11Msu 69 Lincolnville Central SchoolWaldo260Non-transient non-communityGroundwater
12Belfast Curling ClubWaldo230Transient non-communityGroundwater
13Ridge Top RestaurantWaldo225Transient non-communityGroundwater
14Northport Travel ParkWaldo205Transient non-communityGroundwater
15Fair Haven CampsWaldo192Transient non-communityGroundwater
16Youngtown InnWaldo192Transient non-communityGroundwater
17Loris CafeWaldo190Transient non-communityGroundwater
18Mdoc State Park-Lake St GeorgeWaldo184Transient non-communityGroundwater
19Waldo County Technical CenterWaldo181Non-transient non-communityGroundwater
20Savz Inc.Waldo180Transient non-communityGroundwater
21The Lost Kitchen MillWaldo168Transient non-communityGroundwater
22Rsu 12 Palermo Consolidated SchoolWaldo151Non-transient non-communityGroundwater
23Clifford Arts & Student CenterWaldo150Transient non-communityGroundwater
24Rsu 71 Ames Elementary SchoolWaldo150Non-transient non-communityGroundwater
25Islesboro Community CenterWaldo147Transient non-communityGroundwater
26Morrill Village Water DistrictWaldo143CommunityGroundwater
27Tarratine Golf RestaurantWaldo134Transient non-communityGroundwater
28Smk Donuts Inc.-Dunkin Donuts UnityWaldo133Transient non-communityGroundwater
29The Ecology Learning CenterWaldo127Non-transient non-communityGroundwater
30Tanglewood 4-H CampWaldo125Transient non-communityGroundwater
31Mdoc State Park-Swan LakeWaldo116Transient non-communityGroundwater
32Islesboro Central SchoolWaldo115Non-transient non-communityGroundwater
33Robbins LumberWaldo108Non-transient non-communityGroundwater
34Rsu 71 Kermit S Nickerson SchoolWaldo107Non-transient non-communityGroundwater
35Inn at Oceans EdgeWaldo105Transient non-communityGroundwater
36Depot Country StoreWaldo102Transient non-communityGroundwater
37The Sandy Point Water CompanyWaldo98CommunityGroundwater
38Birchwood Trailer ParkWaldo90CommunityGroundwater
39Belfast Cohousing & Ecovillage CondosWaldo90CommunityGroundwater
40Unity By the Stream LLCWaldo88CommunityGroundwater
41Rsu 03 Troy Central SchoolWaldo85Non-transient non-communityGroundwater
42Ducktrap Harbor CondominiumsWaldo83CommunityGroundwater
43Hidden Valley Camp-Pd BarnWaldo75Transient non-communityGroundwater
44Piper Stream Mobile Home ParkWaldo75CommunityGroundwater
45Howards Trailer ParkWaldo75CommunityGroundwater
46Camp SearsmontWaldo72Transient non-communityGroundwater
47Pottles Restaurant and BarWaldo72Transient non-communityGroundwater
48Rsu 03 Monroe Elementary SchoolWaldo71Non-transient non-communityGroundwater
49Ohana CampingWaldo65Transient non-communityGroundwater
50Belfast Area Childrens CenterWaldo63Non-transient non-communityGroundwater

All other water systems in Waldo County (25)

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

Waldo County water systems: frequently asked questions

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

EPA's SDWIS records file 75 active public water systems under Waldo County, Maine: 18 community systems (24%), 15 non-transient non-community systems (20%) and 42 transient non-community systems (56%).

Who supplies drinking water in Waldo County, ME?

The largest community water systems filed under Waldo County are Belfast Water District (5,698 people served), Searsport Water District (2,763 people served) and Winterport Water District (763 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 Waldo County's drinking water come from groundwater or surface water?

Of the 75 active public water systems in Waldo County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Belfast Water District, uses groundwater.

Where can I find a water quality report for Waldo 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. 18 community systems are filed under Waldo 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 Waldo 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 Waldo County, Maine”, https://aquacensus.com/water-systems/maine/waldo (data as of October 1, 2026).