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Washington County, Wisconsin — public water systems

At a glance

268 active public water systems are filed under Washington County, Wisconsin in EPA's SDWIS records, together reporting 132,959 people served. The largest is West Bend Waterworks, which reports serving 31,752 people. 15 are community water systems serving people where they live; the other 253 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

268

Population served

133K

Community systems

15

Groundwater share

100%

How does Washington County compare with other Wisconsin counties?

Washington County has the 6th-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 132,959 people served in total, the 10th-largest county figure in the state and 2.6% of the statewide total. The average system here reports serving 496 people, roughly in line with 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 Washington County's drinking water come from?

By primary water source, Washington County's active systems draw on groundwater (268, 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, West Bend Waterworks, draws primarily on groundwater.

What kinds of water systems operate in Washington County?

Washington County's active systems break down as 15 community systems (5.6%), 37 non-transient non-community systems (14%) and 216 transient non-community systems (81%). 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 (14%) and state government (1.9%).

The 50 largest water systems in Washington County

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Active public water systems in Washington County, Wisconsin
#Water systemCountyPopulation servedTypeSource
1West Bend WaterworksWashington31,752CommunityGroundwater
2Germantown Water UtilityWashington20,027CommunityGroundwater
3Hartford WaterworksWashington15,805CommunityGroundwater
4Jackson WaterworksWashington7,844CommunityGroundwater
5Slinger Water UtilityWashington5,659CommunityGroundwater
6Kewaskum WaterworksWashington4,309CommunityGroundwater
7Cabelas - RichfieldWashington3,931Non-transient non-communityGroundwater
8Kwik Trip #1013Washington2,253Non-transient non-communityGroundwater
9Fox Bros Piggly Wiggly Inc. - HubertusWashington1,314Non-transient non-communityGroundwater
10Allenton Sanitary DistrictWashington860CommunityGroundwater
11Discalced Carmelites & Holy Hill CafeWashington823Transient non-communityGroundwater
12Kettle Moraine Lutheran HsWashington821Non-transient non-communityGroundwater
13Pioneer PlazaWashington808Transient non-communityGroundwater
14The ColumbianWashington752Transient non-communityGroundwater
15Rstore #4517Washington720Transient non-communityGroundwater
16Caseys General Store #3793Washington715Transient non-communityGroundwater
17St Johns Lutheran SchoolWashington710Non-transient non-communityGroundwater
18Reserve at Hartford theWashington610Transient non-communityGroundwater
19Amy Belle SchoolWashington522Non-transient non-communityGroundwater
20Addison Elementary SchoolWashington515Non-transient non-communityGroundwater
21Sunburst Ski Area - Maint ShopWashington510Transient non-communityGroundwater
22Lazy Days Area C & Lower DWashington506Transient non-communityGroundwater
23Sunburst Snowtubing AreaWashington500Transient non-communityGroundwater
24Sunburst Ski AreaWashington500Transient non-communityGroundwater
25Daniel Boone Conservation League Club HouseWashington453Transient non-communityGroundwater
26St Gabriel School-ParishWashington438Non-transient non-communityGroundwater
27Fox & Hounds Restaurant - BarWashington415Transient non-communityGroundwater
28Fox & Hounds Restaurant - KitchenWashington415Transient non-communityGroundwater
29Richfield Middle SchoolWashington410Non-transient non-communityGroundwater
30Agave Asador & CantinaWashington410Transient non-communityGroundwater
31Friess Lake Elementary SchoolWashington407Non-transient non-communityGroundwater
32Erin SchoolWashington405Non-transient non-communityGroundwater
33Kenickys Public HouseWashington404Transient non-communityGroundwater
34Scenic View Country ClubWashington403Transient non-communityGroundwater
35Rockfield SchoolWashington375Non-transient non-communityGroundwater
36Minikani Ymca Camp - Halquist Family LodgeWashington364Transient non-communityGroundwater
37Shepherd of the Hills Church - NewWashington364Transient non-communityGroundwater
38Cedar Lake Home 5Washington330CommunityGroundwater
39Weasler EngineeringWashington325Non-transient non-communityGroundwater
40Country MartWashington320Transient non-communityGroundwater
41Minikani Ymca Camp - Dining LodgeWashington309Transient non-communityGroundwater
42Minikani Ymca Camp - Trail BlazerWashington309Transient non-communityGroundwater
43Minikani Ymca Camp - Horse BarnWashington309Transient non-communityGroundwater
44Minikani Ymca Camp - Explorer UnitWashington309Transient non-communityGroundwater
45Minikani Ymca Camp - Pioneer UnitWashington309Transient non-communityGroundwater
46West Bend Lakes Golf & RecreationWashington307Transient non-communityGroundwater
47Hartford Town HallWashington305Transient non-communityGroundwater
48Richfield Heritage Park - Concession StandWashington304Transient non-communityGroundwater
49Richfield Heritage Park and Municipal ShopWashington304Transient non-communityGroundwater
50Camp Awana 1 Mess HallWashington302Transient non-communityGroundwater

All other water systems in Washington County (218)

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

Washington County water systems: frequently asked questions

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

EPA's SDWIS records file 268 active public water systems under Washington County, Wisconsin: 15 community systems (5.6%), 37 non-transient non-community systems (14%) and 216 transient non-community systems (81%).

Who supplies drinking water in Washington County, WI?

The largest community water systems filed under Washington County are West Bend Waterworks (31,752 people served), Germantown Water Utility (20,027 people served) and Hartford Waterworks (15,805 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 Washington County's drinking water come from groundwater or surface water?

Of the 268 active public water systems in Washington County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, West Bend Waterworks, uses groundwater.

Where can I find a water quality report for Washington 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. 15 community systems are filed under Washington 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 Washington 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 Washington County, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/washington (data as of October 1, 2026).