Public water system · WI6420455
ActiveMonkeys Roost
At a glance
Monkeys Roost (PWSID WI6420455) is an active transient non-community water system in Monroe County, Wisconsin. It reports serving 75 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in July 2003.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
75
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Monkeys Roost compare with other water systems in Monroe County?
By EPA's size categories, Monkeys Roost is a very small system (500 people or fewer). Monroe County has 102 active public water systems. Its population served is well below the county average of 385 people per system, and accounts for 0.2% of the 39,274 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 Monkeys Roost is about half of 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 Monkeys Roost?
EPA lists Monkeys Roost as privately owned. 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. 67 of the 102 active systems in Monroe County (66%) are also privately owned.
Does Monkeys Roost have drinking water violations?
EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in July 2003. The violations listed here began between January 1996 and July 2003. By type: 4 contaminant level above the legal limit, 2 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Nitrate-Nitrite (2 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2003-07-29 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2003-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitrate-Nitritecode 1038 | Yes | Resolved |
| 1999-10-01 | Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04 | Nitratecode 1040 | No | Resolved |
| 1999-09-01 | Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04 | Nitratecode 1040 | No | Resolved |
| 1999-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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 |
| 1996-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitrate-Nitritecode 1038 | Yes | Resolved |
All 7 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.
Monkeys Roost: frequently asked questions
Who runs Monkeys Roost?
Monkeys Roost (PWSID WI6420455) is a transient non-community water system privately owned. It is regulated by the WI state drinking water program.
How many people does Monkeys Roost serve?
Monkeys Roost reports serving 75 people through 1 service connection in Monroe County, Wisconsin.
Where does Monkeys Roost 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 Monkeys Roost have any drinking water violations?
EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in July 2003. 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 Monkeys Roost'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 7 violations for this system; 4 are health-based, and the most recent began in July 2003. For current results, consult EPA ECHO, or the WI state drinking water program.
Where can I find Monkeys Roost's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Monkeys Roost 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 Monroe County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sparta Waterworks | Monroe | 10,025 | Community | Groundwater |
| Fort Mccoy North Post | Monroe | 10,000 | Community | Groundwater |
| Tomah Waterworks | Monroe | 9,192 | Community | Groundwater |
| Cashton Waterworks | Monroe | 1,120 | Community | Groundwater |
| Brookwood High School | Monroe | 700 | Non-transient non-community | Groundwater |
| Norwalk Waterworks | Monroe | 653 | 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, “Monkeys Roost, PWSID WI6420455, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/monkeys-roost-wi6420455 (data as of October 1, 2026).