Public water system · WI2686008
ActiveLannon Water Utility
At a glance
Lannon Water Utility (PWSID WI2686008) is an active community water system in Waukesha County, Wisconsin. It reports serving 172 people through 24 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
172
Service connections
24
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Lannon Water Utility compare with other water systems in Waukesha County?
By EPA's size categories, Lannon Water Utility is a very small system (500 people or fewer). Waukesha County has 589 active public water systems. Its population served is well below the county average of 549 people per system, and accounts for less than 0.1% of the 323,265 people reported by systems filed under the county. Across Wisconsin, the 11,056 active systems average 469 people each. Nationally, the average active community water system reports serving 6,703 people, so Lannon Water Utility is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Wisconsin has 1,053 active community water systems, 9.5% 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 Lannon Water Utility?
EPA lists Lannon Water Utility as owned by a local 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. 102 of the 589 active systems in Waukesha County (17%) are also owned by a local government.
Does Lannon Water Utility have drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in April 2025. The violations listed here began between July 2012 and April 2025. By type: 1 monitoring and 1 contaminant level above the legal limit. The contaminants or rules involved are Revised Total Coliform Rule and Total coliform bacteria (TCR). 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 |
|---|---|---|---|---|
| 2025-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2012-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
Lannon Water Utility: frequently asked questions
Who runs Lannon Water Utility?
Lannon Water Utility (PWSID WI2686008) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Lannon Water Utility serve?
Lannon Water Utility reports serving 172 people through 24 service connections in Waukesha County, Wisconsin.
Where does Lannon Water Utility 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 Lannon Water Utility have any drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in April 2025. 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 Lannon Water Utility'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; 1 is health-based, and the most recent began in April 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Lannon Water Utility's water quality report?
As a community water system, Lannon Water Utility must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Waukesha County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Waukesha Water Utility | Waukesha | 70,718 | Community | Purchased surface water |
| Brookfield Water Utility | Waukesha | 29,070 | Community | Groundwater |
| New Berlin Water Utility | Waukesha | 27,899 | Community | Purchased surface water |
| Menomonee Falls Ww - Surface Water | Waukesha | 23,867 | Community | Purchased surface water |
| Oconomowoc Waterworks | Waukesha | 15,805 | Community | Groundwater |
| Sussex Village Hall & Water Utility | Waukesha | 11,750 | 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, “Lannon Water Utility, PWSID WI2686008, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/lannon-water-utility-wi2686008 (data as of October 1, 2026).