Public water system · MI2020449
ActiveDnr-Big Knob Cg
At a glance
Dnr-Big Knob Cg (PWSID MI2020449) is an active transient non-community water system in Mackinac County, Michigan. It reports serving 25 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in October 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
25
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Dnr-Big Knob Cg compare with other water systems in Mackinac County?
By EPA's size categories, Dnr-Big Knob Cg is a very small system (500 people or fewer). Mackinac County has 113 active public water systems. Its population served is well below the county average of 110 people per system, and accounts for 0.2% 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 transient non-community water system reports serving 144 people, so Dnr-Big Knob Cg is well 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. 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 Dnr-Big Knob Cg?
EPA lists Dnr-Big Knob Cg as owned by a state 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. 10 of the 113 active systems in Mackinac County (8.8%) are also owned by a state government.
Does Dnr-Big Knob Cg have drinking water violations?
EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in October 2018. The violations listed here began between July 1995 and October 2018. By type: 3 contaminant level above the legal limit and 1 monitoring. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 3 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 |
|---|---|---|---|---|
| 2018-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 1999-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1998-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1995-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
All 4 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.
Dnr-Big Knob Cg: frequently asked questions
Who runs Dnr-Big Knob Cg?
Dnr-Big Knob Cg (PWSID MI2020449) is a transient non-community water system owned by a state government. It is regulated by the MI state drinking water program.
How many people does Dnr-Big Knob Cg serve?
Dnr-Big Knob Cg reports serving 25 people through 1 service connection in Mackinac County, Michigan.
Where does Dnr-Big Knob Cg 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 Dnr-Big Knob Cg have any drinking water violations?
EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in October 2018. 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 Dnr-Big Knob Cg'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 4 violations for this system; 3 are health-based, and the most recent began in October 2018. For current results, consult EPA ECHO, or the MI state drinking water program.
Where can I find Dnr-Big Knob Cg's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Dnr-Big Knob Cg 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 Mackinac County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| St. Ignace | Mackinac | 2,987 | Community | Surface water |
| Mackinac Island | Mackinac | 583 | Community | Surface water |
| Engadine School | Mackinac | 552 | Non-transient non-community | Groundwater |
| Les Cheneaux School | Mackinac | 336 | Non-transient non-community | Groundwater |
| Mdot - Gros Cap Park, P219 | Mackinac | 200 | Transient non-community | Groundwater |
| Hiawatha Sportmen'S Club-Grp 1 (7-16) | 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, “Dnr-Big Knob Cg, PWSID MI2020449, Michigan”, https://aquacensus.com/water-systems/michigan/dnr-big-knob-cg-mi2020449 (data as of October 1, 2026).