Public water system · MI2015424
ActiveMackinaw City Koa
At a glance
Mackinaw City Koa (PWSID MI2015424) is an active transient non-community water system in Emmet County, Michigan. It reports serving 135 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2017.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
135
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Mackinaw City Koa compare with other water systems in Emmet County?
By EPA's size categories, Mackinaw City Koa is a very small system (500 people or fewer). Emmet County has 198 active public water systems. Its population served is about 30% below the county average of 192 people per system, and accounts for 0.4% of the 38,096 people reported by systems filed under the county. Across Michigan, the 10,599 active systems average 847 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Mackinaw City Koa is roughly in line with that figure.
What does “transient non-community water system” mean?
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. Michigan has 7,865 active transient non-community water systems, 74% of the state's 10,599 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 10,214 Michigan systems (96%) list groundwater as their primary source.
Who owns and regulates Mackinaw City Koa?
EPA lists Mackinaw City Koa as privately owned. 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. 188 of the 198 active systems in Emmet County (95%) are also privately owned.
Does Mackinaw City Koa have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2017. The violations listed here began between January 2000 and April 2017. By type: 10 monitoring and reporting and 2 monitoring. The contaminant or rule involved most often is Nitrate (5 of them). EPA lists 12 as resolved. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2017-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2015-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2015-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2013-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2013-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2000-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2000-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2000-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
The 12 most recent 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.
Mackinaw City Koa: frequently asked questions
Who runs Mackinaw City Koa?
Mackinaw City Koa (PWSID MI2015424) is a transient non-community water system privately owned. It is regulated by the MI state drinking water program.
How many people does Mackinaw City Koa serve?
Mackinaw City Koa reports serving 135 people through 1 service connection in Emmet County, Michigan.
Where does Mackinaw City Koa get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Mackinaw City Koa have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2017. 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 Mackinaw City Koa'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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2017. For current results, consult EPA ECHO, or the MI state drinking water program.
Where can I find Mackinaw City Koa's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Mackinaw City Koa is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Emmet County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Petoskey, City of | Emmet | 8,979 | Community | Groundwater |
| Pleasant View Ez Mart | Emmet | 1,500 | Transient non-community | Groundwater |
| Birchwood Farms | Emmet | 1,227 | Community | Groundwater |
| Harbor Springs, City of | Emmet | 1,194 | Community | Groundwater |
| Little Traverse Township | Emmet | 1,102 | Community | Groundwater |
| Bay View Association | Emmet | 831 | Community | Purchased 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, “Mackinaw City Koa, PWSID MI2015424, Michigan”, https://aquacensus.com/water-systems/michigan/mackinaw-city-koa-mi2015424 (data as of October 1, 2026).