Public water system · WI4050693

Active

Twin Oaks Golf Course

At a glance

Twin Oaks Golf Course (PWSID WI4050693) is an active transient non-community water system in Brown County, Wisconsin. It reports serving 25 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, 2 are health-based, and the most recent began in July 2021.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

Service connections

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDWI4050693

System typeTransient non-community water system

Activity statusActive

Population served25

Service connections1

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyWI state drinking water program

City servedDenmark

StateWisconsin

ZIP—

CountyBrown County

How does Twin Oaks Golf Course compare with other water systems in Brown County?

By EPA's size categories, Twin Oaks Golf Course is a very small system (500 people or fewer). Brown County has 148 active public water systems. Its population served is well below the county average of 1,666 people per system, and accounts for less than 0.1% of the 246,537 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 Twin Oaks Golf Course 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. 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 Twin Oaks Golf Course?

EPA lists Twin Oaks Golf Course 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. 106 of the 148 active systems in Brown County (72%) are also privately owned.

Does Twin Oaks Golf Course have drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in July 2021. The violations listed here began between May 2004 and July 2021. By type: 5 public notice, recordkeeping or other, 5 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Public Notice (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
2021-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A	Revised Total Coliform Rulecode 8000	Yes	Resolved
2020-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A	Revised Total Coliform Rulecode 8000	Yes	Resolved
2009-06-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2009-06-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2009-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2009-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2008-06-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2008-06-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2008-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2008-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2004-07-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2004-05-13	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	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.

Twin Oaks Golf Course: frequently asked questions

Who runs Twin Oaks Golf Course?

Twin Oaks Golf Course (PWSID WI4050693) is a transient non-community water system privately owned. It is regulated by the WI state drinking water program.

How many people does Twin Oaks Golf Course serve?

Twin Oaks Golf Course reports serving 25 people through 1 service connection in Brown County, Wisconsin.

Where does Twin Oaks Golf Course 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 Twin Oaks Golf Course have any drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in July 2021. 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 Twin Oaks Golf Course'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, 2 are health-based, and the most recent began in July 2021. For current results, consult EPA ECHO, or the WI state drinking water program.

Where can I find Twin Oaks Golf Course's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Twin Oaks Golf Course 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 Brown County

Water system	County	Population served	Type	Source
Green Bay Waterworks	Brown	107,369	Community	Surface water
De Pere Waterworks Sa 1	Brown	25,660	Community	Purchased surface water
Howard Waterworks	Brown	21,133	Community	Purchased surface water
Ashwaubenon Waterworks	Brown	17,730	Community	Purchased surface water
Bellevue Waterworks	Brown	16,715	Community	Purchased surface water
Allouez Waterworks	Brown	13,923	Community	Purchased surface water

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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, “Twin Oaks Golf Course, PWSID WI4050693, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/twin-oaks-golf-course-wi4050693 (data as of October 1, 2026).