Public water system · MI0003970
ActiveMackinac Island
At a glance
Mackinac Island (PWSID MI0003970) is an active community water system in Mackinac County, Michigan. It reports serving 583 people through 662 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 8 violations for this system; none is health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
583
Service connections
662
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Mackinac Island compare with other water systems in Mackinac County?
By EPA's size categories, Mackinac Island is a small system (501 to 3,300 people). Mackinac County has 113 active public water systems, and Mackinac Island is the 2nd-largest of them by population served. Its population served is about 5.3 times the county average of 110 people per system, and accounts for 4.7% of the 12,387 people reported by systems filed under the county. Across Michigan, the 10,599 active systems average 847 people each. Nationally, the average active community water system reports serving 6,703 people, so Mackinac Island is well below that figure.
What does “community water system” mean?
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. Michigan has 1,332 active community water systems, 13% of the state's 10,599 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 68 Michigan systems (0.6%) list surface water as their primary source.
Who owns and regulates Mackinac Island?
EPA lists Mackinac Island as owned by a local government. The MI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 7 of the 113 active systems in Mackinac County (6.2%) are also owned by a local government.
Does Mackinac Island have drinking water violations?
EPA's records list 8 violations for this system; none is health-based, and the most recent began in January 2026. The violations listed here began between April 1991 and January 2026. By type: 5 monitoring and reporting and 3 public notice, recordkeeping or other. The contaminant or rule involved most often is Consumer Confidence Rule (3 of them). EPA lists 7 as resolved and 1 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2026-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Archived |
| 2023-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2020-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2020-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2018-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2001-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1994-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1991-04-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 8 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Mackinac Island: frequently asked questions
Who runs Mackinac Island?
Mackinac Island (PWSID MI0003970) is a community water system owned by a local government. It is regulated by the MI state drinking water program.
How many people does Mackinac Island serve?
Mackinac Island reports serving 583 people through 662 service connections in Mackinac County, Michigan.
Where does Mackinac Island get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Mackinac Island have any drinking water violations?
EPA's records list 8 violations for this system; none is health-based, and the most recent began in January 2026. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Mackinac Island's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 8 violations for this system; none is health-based, and the most recent began in January 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.
Where can I find Mackinac Island's water quality report?
As a community water system, Mackinac Island must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Mackinac County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| St. Ignace | Mackinac | 2,987 | Community | Surface water |
| Engadine School | Mackinac | 552 | Non-transient non-community | Groundwater |
| Les Cheneaux School | Mackinac | 336 | Non-transient non-community | Groundwater |
| Hiawatha Sportmen'S Club-Grp 1 (7-16) | Mackinac | 200 | Transient non-community | Groundwater |
| Mdot - Gros Cap Park, P219 | Mackinac | 200 | Transient non-community | Groundwater |
| Hiawatha Sportmen'S Club-Group 3 (30-35) | Mackinac | 200 | Transient non-community | Groundwater |
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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, “Mackinac Island, PWSID MI0003970, Michigan”, https://aquacensus.com/water-systems/michigan/mackinac-island-mi0003970 (data as of October 1, 2026).