Public water system · WI2685887
ActiveElmbrook- Lake Country
At a glance
Elmbrook- Lake Country (PWSID WI2685887) is an active non-transient non-community water system in Waukesha County, Wisconsin. It reports serving 600 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 4 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
600
Service connections
1
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Elmbrook- Lake Country compare with other water systems in Waukesha County?
By EPA's size categories, Elmbrook- Lake Country is a small system (501 to 3,300 people). Waukesha County has 589 active public water systems. Its population served is roughly in line with the county average of 549 people per system, and accounts for 0.2% 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 non-transient non-community water system reports serving 430 people, so Elmbrook- Lake Country is about 40% above that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Wisconsin has 891 active non-transient non-community water systems, 8.1% 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 Elmbrook- Lake Country?
EPA lists Elmbrook- Lake Country 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. 452 of the 589 active systems in Waukesha County (77%) are also privately owned.
Does Elmbrook- Lake Country have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in April 2025. The violations listed here began between April 2024 and April 2025. By type: 1 monitoring and reporting, 1 public notice, recordkeeping or other, 1 required treatment not met and 1 monitoring. The contaminants or rules involved are Lead and Copper Rule, Public Notice, Lead and Copper Rule Revisions and Revised Total Coliform Rule. EPA lists 3 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-04-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2024-10-17 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Unaddressed |
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Resolved |
| 2024-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
All 4 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.
Elmbrook- Lake Country: frequently asked questions
Who runs Elmbrook- Lake Country?
Elmbrook- Lake Country (PWSID WI2685887) is a non-transient non-community water system privately owned. It is regulated by the WI state drinking water program.
How many people does Elmbrook- Lake Country serve?
Elmbrook- Lake Country reports serving 600 people through 1 service connection in Waukesha County, Wisconsin.
Where does Elmbrook- Lake Country 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 Elmbrook- Lake Country have any drinking water violations?
EPA's records list 4 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 Elmbrook- Lake Country'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 4 violations for this system; 1 is health-based, and the most recent began in April 2025. For current results, consult EPA ECHO, or the WI state drinking water program.
Where can I find Elmbrook- Lake Country's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Elmbrook- Lake Country is a non-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 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 |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Elmbrook- Lake Country, PWSID WI2685887, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/elmbrook-lake-country-wi2685887 (data as of October 1, 2026).