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Ontonagon County, Michigan — public water systems

At a glance

25 active public water systems are filed under Ontonagon County, Michigan in EPA's SDWIS records, together reporting 5,270 people served. The largest is Ontonagon, which reports serving 2,607 people. 5 are community water systems serving people where they live; the other 20 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

25

Population served

5.3K

Community systems

5

Groundwater share

96%

How does Ontonagon County compare with other Michigan counties?

Ontonagon County has the 81st-most active public water systems among the 131 counties listed for active Michigan systems in EPA records; among the 88 with 3 or more systems, the median has 92. Its systems report 5,270 people served in total, the 82nd-largest county figure in the state and less than 0.1% of the statewide total. The average system here reports serving 211 people, well below the Michigan average of 847. 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 Ontonagon County's drinking water come from?

By primary water source, Ontonagon County's active systems draw on groundwater (24, 96%) and surface water (1, 4%). Overall, 96% rely mainly on groundwater (including purchased groundwater) and 4% on surface water, compared with 97% and 3.1% across Michigan. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Ontonagon, draws primarily on surface water.

What kinds of water systems operate in Ontonagon County?

Ontonagon County's active systems break down as 5 community systems (20%) and 20 transient non-community systems (80%). 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 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 (68%), local government (20%) and state government (12%).

Water systems in Ontonagon County

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Active public water systems in Ontonagon County, Michigan
#Water systemCountyPopulation servedTypeSource
1OntonagonOntonagon2,607CommunitySurface water
2Mcmillan TownshipOntonagon391CommunityGroundwater
3Rockland TownshipOntonagon350CommunityGroundwater
4Bergland TownshipOntonagon210CommunityGroundwater
5Interior TownshipOntonagon200CommunityGroundwater
6North Coast Adventures CampgroundOntonagon180Transient non-communityGroundwater
7Settlers CooperativeOntonagon150Transient non-communityGroundwater
8Stannard Township HallOntonagon127Transient non-communityGroundwater
9Ontonagon County ParkOntonagon120Transient non-communityGroundwater
10Tige'S BarOntonagon100Transient non-communityGroundwater
11Char'S CafeOntonagon100Transient non-communityGroundwater
12Da Yooper WayOntonagon80Transient non-communityGroundwater
13J&H Logger'S AlleyOntonagon75Transient non-communityGroundwater
14Mdot - Ewen Pines Wayside, P152Ontonagon75Transient non-communityGroundwater
15Pit Stop Bar & GrillOntonagon70Transient non-communityGroundwater
16Miller'S CottagesOntonagon60Transient non-communityGroundwater
17Rousseau BarOntonagon60Transient non-communityGroundwater
18Mass City BpOntonagon50Transient non-communityGroundwater
19Hoop & Holler TavernOntonagon50Transient non-communityGroundwater
20St. Paul'S Lutheran Church - Mass CityOntonagon50Transient non-communityGroundwater
21Ajs Lodge & OvenOntonagon50Transient non-communityGroundwater
22Mdot - Military Hill Wayside, P150Ontonagon30Transient non-communityGroundwater
23Paulding General StoreOntonagon30Transient non-communityGroundwater
24Greenland Twp Community CenterOntonagon30Transient non-communityGroundwater
25Mdot - Agate Falls Wayside, P153Ontonagon25Transient non-communityGroundwater

Ontonagon County water systems: frequently asked questions

How many public water systems are in Ontonagon County, Michigan?

EPA's SDWIS records file 25 active public water systems under Ontonagon County, Michigan: 5 community systems (20%) and 20 transient non-community systems (80%).

Who supplies drinking water in Ontonagon County, MI?

The largest community water systems filed under Ontonagon County are Ontonagon (2,607 people served), Mcmillan Township (391 people served) and Rockland Township (350 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 Ontonagon County's drinking water come from groundwater or surface water?

Of the 25 active public water systems in Ontonagon County, 96% draw mainly on groundwater and 4% on surface water, counting purchased supplies. The largest system, Ontonagon, uses surface water.

Where can I find a water quality report for Ontonagon 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. 5 community systems are filed under Ontonagon 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 Ontonagon 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 Michigan 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 Ontonagon County, Michigan”, https://aquacensus.com/water-systems/michigan/ontonagon (data as of October 1, 2026).