Public water system · MN5480253
ActiveMac'S Twin Bay Resort
At a glance
Mac'S Twin Bay Resort (PWSID MN5480253) is an active transient non-community water system in Mille Lacs County, Minnesota. It reports serving 50 people through 10 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in October 2015.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
50
Service connections
10
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Mac'S Twin Bay Resort compare with other water systems in Mille Lacs County?
By EPA's size categories, Mac'S Twin Bay Resort is a very small system (500 people or fewer). Mille Lacs County has 91 active public water systems. Its population served is well below the county average of 221 people per system, and accounts for 0.2% of the 20,104 people reported by systems filed under the county. Across Minnesota, the 6,465 active systems average 820 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Mac'S Twin Bay Resort is about 65% below 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. Minnesota has 5,008 active transient non-community water systems, 77% of the state's 6,465 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,261 Minnesota systems (97%) list groundwater as their primary source.
Who owns and regulates Mac'S Twin Bay Resort?
EPA lists Mac'S Twin Bay Resort as privately owned. The MN state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 78 of the 91 active systems in Mille Lacs County (86%) are also privately owned.
Does Mac'S Twin Bay Resort have drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in October 2015. The violations listed here began between August 2013 and October 2015. By type: 1 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 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 |
|---|---|---|---|---|
| 2015-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2013-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 2 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.
Mac'S Twin Bay Resort: frequently asked questions
Who runs Mac'S Twin Bay Resort?
Mac'S Twin Bay Resort (PWSID MN5480253) is a transient non-community water system privately owned. It is regulated by the MN state drinking water program.
How many people does Mac'S Twin Bay Resort serve?
Mac'S Twin Bay Resort reports serving 50 people through 10 service connections in Mille Lacs County, Minnesota.
Where does Mac'S Twin Bay Resort 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 Mac'S Twin Bay Resort have any drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in October 2015. 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 Mac'S Twin Bay Resort'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 2 violations for this system; 1 is health-based, and the most recent began in October 2015. For current results, consult EPA ECHO, or the MN state drinking water program.
Where can I find Mac'S Twin Bay Resort's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Mac'S Twin Bay Resort 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 Mille Lacs County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Princeton | Mille Lacs | 5,421 | Community | Groundwater |
| Milaca | Mille Lacs | 3,043 | Community | Groundwater |
| New Life Christian Center | Mille Lacs | 1,000 | Transient non-community | Groundwater |
| Onamia | Mille Lacs | 831 | Community | Groundwater |
| Isle | Mille Lacs | 820 | Community | Groundwater |
| Broberg'S Country Store | Mille Lacs | 500 | 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, “Mac'S Twin Bay Resort, PWSID MN5480253, Minnesota”, https://aquacensus.com/water-systems/minnesota/mac-s-twin-bay-resort-mn5480253 (data as of October 1, 2026).