Public water system · WI1570169
ActiveWi Dnr Mirror Lake Sandstone Ridge
At a glance
Wi Dnr Mirror Lake Sandstone Ridge (PWSID WI1570169) is an active transient non-community water system in Sauk County, Wisconsin. It reports serving 501 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 2 violations for this system; none is health-based, and the most recent began in October 2008.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
501
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Wi Dnr Mirror Lake Sandstone Ridge compare with other water systems in Sauk County?
By EPA's size categories, Wi Dnr Mirror Lake Sandstone Ridge is a small system (501 to 3,300 people). Sauk County has 199 active public water systems. Its population served is about 46% above the county average of 342 people per system, and accounts for 0.7% of the 68,062 people reported by systems filed under the county. Across Wisconsin, the 11,056 active systems average 469 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Wi Dnr Mirror Lake Sandstone Ridge is about 3.5 times 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. Wisconsin has 9,112 active transient non-community water systems, 82% of the state's 11,056 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 10,978 Wisconsin systems (99%) list groundwater as their primary source.
Who owns and regulates Wi Dnr Mirror Lake Sandstone Ridge?
EPA lists Wi Dnr Mirror Lake Sandstone Ridge as owned by a state government. The WI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 14 of the 199 active systems in Sauk County (7%) are also owned by a state government.
Does Wi Dnr Mirror Lake Sandstone Ridge have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2008. The violations listed here began between April 1996 and October 2008. By type: 2 monitoring and reporting. The contaminants or rules involved are Total coliform bacteria (TCR) and Nitrate. 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 |
|---|---|---|---|---|
| 2008-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1996-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | 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.
Wi Dnr Mirror Lake Sandstone Ridge: frequently asked questions
Who runs Wi Dnr Mirror Lake Sandstone Ridge?
Wi Dnr Mirror Lake Sandstone Ridge (PWSID WI1570169) is a transient non-community water system owned by a state government. It is regulated by the WI state drinking water program.
How many people does Wi Dnr Mirror Lake Sandstone Ridge serve?
Wi Dnr Mirror Lake Sandstone Ridge reports serving 501 people through 1 service connection in Sauk County, Wisconsin.
Where does Wi Dnr Mirror Lake Sandstone Ridge 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 Wi Dnr Mirror Lake Sandstone Ridge have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2008. 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 Wi Dnr Mirror Lake Sandstone Ridge'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; none is health-based, and the most recent began in October 2008. For current results, consult EPA ECHO, or the WI state drinking water program.
Where can I find Wi Dnr Mirror Lake Sandstone Ridge's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Wi Dnr Mirror Lake Sandstone Ridge 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 Sauk County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Baraboo Waterworks | Sauk | 12,703 | Community | Groundwater |
| Reedsburg Waterworks | Sauk | 9,984 | Community | Groundwater |
| Ho Chunk Casino | Sauk | 5,486 | Non-transient non-community | Groundwater |
| Prairie Du Sac Waterworks | Sauk | 4,006 | Community | Groundwater |
| Sauk City Waterworks | Sauk | 3,518 | Community | Groundwater |
| Lake Delton Waterworks | Sauk | 2,914 | 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, “Wi Dnr Mirror Lake Sandstone Ridge, PWSID WI1570169, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/wi-dnr-mirror-lake-sandstone-ridge-wi1570169 (data as of October 1, 2026).