Skip to content
AquaCensus

Oneida County, Wisconsin — public water systems

At a glance

345 active public water systems are filed under Oneida County, Wisconsin in EPA's SDWIS records, together reporting 40,498 people served. The largest is Rhinelander Water & Wastewater, which reports serving 8,234 people. 11 are community water systems serving people where they live; the other 334 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

345

Population served

40.5K

Community systems

11

Groundwater share

100%

How does Oneida County compare with other Wisconsin counties?

Oneida County has the 4th-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 40,498 people served in total, the 29th-largest county figure in the state and 0.8% of the statewide total. The average system here reports serving 117 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 Oneida County's drinking water come from?

By primary water source, Oneida County's active systems draw on groundwater (345, 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, Rhinelander Water & Wastewater, draws primarily on groundwater.

What kinds of water systems operate in Oneida County?

Oneida County's active systems break down as 11 community systems (3.2%), 11 non-transient non-community systems (3.2%) and 323 transient non-community systems (94%). 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 (87%), state government (7.8%), local government (4.3%) and federal government (1.2%).

The 50 largest water systems in Oneida County

🔒 Create a free account to export CSV
Active public water systems in Oneida County, Wisconsin
#Water systemCountyPopulation servedTypeSource
1Rhinelander Water & WastewaterOneida8,234CommunityGroundwater
2Lakeland Sanitary Dist 1Oneida2,381CommunityGroundwater
3Minocqua Hazelhurst Elem SchOneida650Non-transient non-communityGroundwater
4Three Lakes Sanitary DistrictOneida500CommunityGroundwater
5Scouting America Camp Tesomas Program Center and Dining HallOneida500Transient non-communityGroundwater
6Wi Dnr Clear Lk Cmpgd 8Oneida450Transient non-communityGroundwater
7Wi Dnr Clear Lk Cmpgd 23Oneida450Transient non-communityGroundwater
8Wi Dnr Clear Lk Cmpgd 10Oneida450Transient non-communityGroundwater
9Wi Dnr Clear Lk Cmpgd 7Oneida450Transient non-communityGroundwater
10Wi Dnr Clear Lk Cmpgd 9Oneida450Transient non-communityGroundwater
11Wi Dnr Clear Lk Cmpgd 24Oneida450Transient non-communityGroundwater
12Pelican Elementary SchoolOneida353Non-transient non-communityGroundwater
13Honey Rock Camp Chrouser CenterOneida350Transient non-communityGroundwater
14Camp Luther Shower House WellOneida350Transient non-communityGroundwater
15Northernaire Sanitary DistrictOneida315CommunityGroundwater
16Wildwood Wildlife ParkOneida300Transient non-communityGroundwater
17Wi Dnr Clear Lk Cmpgd ShowerOneida300Transient non-communityGroundwater
18Rock of Ages Lutheran ChurchOneida300Transient non-communityGroundwater
19Holy Family Catholic ChurchOneida300Transient non-communityGroundwater
20Wildwood Wildlife Park Jambo HutOneida300Transient non-communityGroundwater
21Pines Event Center theOneida280Transient non-communityGroundwater
22Willow HavenOneida260Transient non-communityGroundwater
23Marshfield Clinic Woodruff CenterOneida260Transient non-communityGroundwater
24Camp Agawak MainOneida250Transient non-communityGroundwater
25Chippewa Ranch Camp Mess HallOneida225Transient non-communityGroundwater
26Camp Kawaga Inc. 6 PorcupineOneida200Transient non-communityGroundwater
27Camp Kawaga Inc. 7 Mess HallOneida200Transient non-communityGroundwater
28Camp Kawaga Inc. 3 Field BubblerOneida200Transient non-communityGroundwater
29Camp Kawaga Inc. 1 Bide A WeeOneida200Transient non-communityGroundwater
30Camp Kawaga Inc. 5 Crows NestOneida200Transient non-communityGroundwater
31Honey Rock Camp Lower PlazaOneida200Transient non-communityGroundwater
32Scouting America Camp Tesomas Senior Staff HousingOneida200Transient non-communityGroundwater
33Scouting America Camp Tesomas East Shower HouseOneida200Transient non-communityGroundwater
34Scouting America Camp Tesomas West Camper Shower HouseOneida200Transient non-communityGroundwater
35Wi Dnr Buffalo Lk Cmpgd 18Oneida200Transient non-communityGroundwater
36West Bay Cmpng Rsrt Main BldgOneida200Transient non-communityGroundwater
37Holiday Acres MainOneida200Transient non-communityGroundwater
38Wi Dnr Clear Lk Pic 14Oneida200Transient non-communityGroundwater
39Grace Foursquare ChurchOneida200Transient non-communityGroundwater
40Three Lakes Town MarketOneida200Transient non-communityGroundwater
41Spangs Italian RestaurantOneida200Transient non-communityGroundwater
42White Stag InnOneida200Transient non-communityGroundwater
43Camp Deerhorn 1 LaundryOneida190Transient non-communityGroundwater
44Camp Deerhorn 2 OfficeOneida190Transient non-communityGroundwater
45Camp Deerhorn 3 Bath HouseOneida190Transient non-communityGroundwater
46Crescent Lake Bible CampOneida175Transient non-communityGroundwater
47Camp Horseshoe West Shower BuildingOneida160Transient non-communityGroundwater
48Camp Horseshoe Complex CourtOneida160Transient non-communityGroundwater
49Camp Horseshoe Main WellOneida160Transient non-communityGroundwater
50Wi Dnr Buffalo Lk Cmpgd 2046Oneida150Transient non-communityGroundwater

All other water systems in Oneida County (295)

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

Oneida County water systems: frequently asked questions

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

EPA's SDWIS records file 345 active public water systems under Oneida County, Wisconsin: 11 community systems (3.2%), 11 non-transient non-community systems (3.2%) and 323 transient non-community systems (94%).

Who supplies drinking water in Oneida County, WI?

The largest community water systems filed under Oneida County are Rhinelander Water & Wastewater (8,234 people served), Lakeland Sanitary Dist 1 (2,381 people served) and Three Lakes Sanitary District (500 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 Oneida County's drinking water come from groundwater or surface water?

Of the 345 active public water systems in Oneida County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Rhinelander Water & Wastewater, uses groundwater.

Where can I find a water quality report for Oneida 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. 11 community systems are filed under Oneida 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 Oneida 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 Oneida County, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/oneida (data as of October 1, 2026).