Public water system · WI2650266

Active

Duck Inn

At a glance

Duck Inn (PWSID WI2650266) is an active transient non-community water system in Walworth County, Wisconsin. It reports serving 60 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 September 2009.

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

PWSIDWI2650266

System typeTransient non-community water system

Activity statusActive

Population served60

Service connections1

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyWI state drinking water program

City servedDelavan

StateWisconsin

ZIP—

CountyWalworth County

How does Duck Inn compare with other water systems in Walworth County?

By EPA's size categories, Duck Inn is a very small system (500 people or fewer). Walworth County has 252 active public water systems. Its population served is well below the county average of 380 people per system, and accounts for less than 0.1% of the 95,693 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 Duck Inn is about 58% 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 Duck Inn?

EPA lists Duck Inn 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. 215 of the 252 active systems in Walworth County (85%) are also privately owned.

Does Duck Inn have drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in September 2009. The violations listed here began between January 1997 and September 2009. By type: 8 monitoring and reporting, 2 contaminant level above the legal limit and 2 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (8 of them). EPA lists 11 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
2009-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
2009-08-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2009-06-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2006-01-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2005-12-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2005-10-04	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2005-01-01	Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25	Total coliform bacteria (TCR)code 3100	No	Resolved
1999-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
1999-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1997-03-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1997-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
1997-01-01	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.

Duck Inn: frequently asked questions

Who runs Duck Inn?

Duck Inn (PWSID WI2650266) is a transient non-community water system privately owned. It is regulated by the WI state drinking water program.

How many people does Duck Inn serve?

Duck Inn reports serving 60 people through 1 service connection in Walworth County, Wisconsin.

Where does Duck Inn 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 Duck Inn 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 September 2009. 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 Duck Inn'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 September 2009. For current results, consult EPA ECHO, or the WI state drinking water program.

Where can I find Duck Inn's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Duck Inn 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 Walworth County

Water system	County	Population served	Type	Source
Whitewater Waterworks	Walworth	14,000	Community	Groundwater
Elkhorn Waterworks	Walworth	10,317	Community	Groundwater
Delavan Waterworks	Walworth	9,028	Community	Groundwater
Lake Geneva Utility Commission	Walworth	7,107	Community	Groundwater
East Troy Waterworks	Walworth	5,054	Community	Groundwater
Bloomfield, Village of	Walworth	4,071	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, “Duck Inn, PWSID WI2650266, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/duck-inn-wi2650266 (data as of October 1, 2026).