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Door County, Wisconsin — public water systems

At a glance

451 active public water systems are filed under Door County, Wisconsin in EPA's SDWIS records, together reporting 34,679 people served. The largest is Sturgeon Bay Waterworks, which reports serving 9,700 people. 7 are community water systems serving people where they live; the other 444 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

451

Population served

34.7K

Community systems

7

Groundwater share

100%

How does Door County compare with other Wisconsin counties?

Door County has the 3rd-most active public water systems among the 90 counties listed for active Wisconsin systems in EPA records; among the 74 with 3 or more systems, the median has 140. Its systems report 34,679 people served in total, the 32nd-largest county figure in the state and 0.7% of the statewide total. The average system here reports serving 77 people, well below the Wisconsin average of 469. 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 Door County's drinking water come from?

By primary water source, Door County's active systems draw on groundwater (451, 100%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 99% and 0.6% across Wisconsin. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Sturgeon Bay Waterworks, draws primarily on groundwater.

What kinds of water systems operate in Door County?

Door County's active systems break down as 7 community systems (1.6%), 7 non-transient non-community systems (1.6%) and 437 transient non-community systems (97%). 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 (84%), local government (10%), state government (6.2%) and federal government (0.2%).

The 50 largest water systems in Door County

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Active public water systems in Door County, Wisconsin
#Water systemCountyPopulation servedTypeSource
1Sturgeon Bay WaterworksDoor9,700CommunityGroundwater
2Southern Door Sch DistDoor1,350Non-transient non-communityGroundwater
3Sister Bay WaterworksDoor1,000CommunityGroundwater
4Sevastopol High SchDoor715Non-transient non-communityGroundwater
5Gibraltar High SchoolDoor695Non-transient non-communityGroundwater
6LoftDoor308Transient non-communityGroundwater
7Culvers Town & Country C StoreDoor265Transient non-communityGroundwater
8North Haven Pool WellDoor223Transient non-communityGroundwater
9Wild TomatoDoor215Transient non-communityGroundwater
10St Paul Cath ChDoor206Transient non-communityGroundwater
11Wi Dnr Pen ConcessionDoor206Transient non-communityGroundwater
12Lautenbachs Orchard Country Winery & MarketDoor204Transient non-communityGroundwater
13Shepherd of the Bay LutheranDoor203Transient non-communityGroundwater
14Wi Dnr Pen 700 Site WellDoor202Transient non-communityGroundwater
15Wi Dnr Pen Tennison BayDoor202Transient non-communityGroundwater
16Wi Dnr Pen 600 Site WellDoor202Transient non-communityGroundwater
17Door Co Y M C A NorthDoor190Transient non-communityGroundwater
18Doorway To LearningDoor170Non-transient non-communityGroundwater
19Baileys Grove CmpgdDoor152Transient non-communityGroundwater
20Oaks theDoor135CommunityGroundwater
21Heritage Lake ResortDoor130CommunityGroundwater
22Peninsula PlayersDoor128Transient non-communityGroundwater
23St Marys of the Lake ChDoor127Transient non-communityGroundwater
24Wi Dnr Pot Shower BldgDoor125Transient non-communityGroundwater
25Maplewood Sanitary Dist 1Door122CommunityGroundwater
26Macready Artisan Bread CoDoor114Transient non-communityGroundwater
27Anchorage Cove Condos East ParkingDoor113Transient non-communityGroundwater
28Tranquil Timbers Camping Retreat/StoreDoor110Transient non-communityGroundwater
29P C JunctionDoor110Transient non-communityGroundwater
30On Deck Clothing CoDoor110Transient non-communityGroundwater
31Wi Dnr Pen Welckers PtDoor107Transient non-communityGroundwater
32Florian Ii Beachfront InnDoor106Transient non-communityGroundwater
33Blue Horse Beach CafeDoor105Transient non-communityGroundwater
34Waterbury InnDoor105Transient non-communityGroundwater
35Julies Park CafeDoor105Transient non-communityGroundwater
36Summer Kitchen RestrDoor105Transient non-communityGroundwater
37Htr Door CountyDoor104Transient non-communityGroundwater
38Zion Ev Lutheran ChDoor104Transient non-communityGroundwater
39Ephraim Yacht Harbor DockDoor102Transient non-communityGroundwater
40Ephraim Beach ParkDoor102Transient non-communityGroundwater
41Washington Island Red Barn Theater ParkDoor102Transient non-communityGroundwater
42Wi Dnr Pen Weborg PtDoor102Transient non-communityGroundwater
43St Paul Lutheran Ch ElcaDoor102Transient non-communityGroundwater
44Homestead SuitesDoor102Transient non-communityGroundwater
45Ephraim Yacht Harbor CondosDoor101Transient non-communityGroundwater
46Wi Dnr Pot Daisy Fld Winter WellDoor100Transient non-communityGroundwater
47Wi Dnr Pot Boat LaunchDoor100Transient non-communityGroundwater
48Fresh Coast Motel-DeckhouseDoor100Transient non-communityGroundwater
49Founders Square PelletiersDoor100Transient non-communityGroundwater
50Rustic Timbers OfficeDoor100Transient non-communityGroundwater

All other water systems in Door County (401)

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

Door County water systems: frequently asked questions

How many public water systems are in Door County, Wisconsin?

EPA's SDWIS records file 451 active public water systems under Door County, Wisconsin: 7 community systems (1.6%), 7 non-transient non-community systems (1.6%) and 437 transient non-community systems (97%).

Who supplies drinking water in Door County, WI?

The largest community water systems filed under Door County are Sturgeon Bay Waterworks (9,700 people served), Sister Bay Waterworks (1,000 people served) and Oaks the (135 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 Door County's drinking water come from groundwater or surface water?

Of the 451 active public water systems in Door County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Sturgeon Bay Waterworks, uses groundwater.

Where can I find a water quality report for Door 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. 7 community systems are filed under Door 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 Door 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 Wisconsin 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 Door County, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/door (data as of October 1, 2026).