Public water system · CO0130843
ActiveWillowbrook Wsd
At a glance
Willowbrook Wsd (PWSID CO0130843) is an active community water system in Jefferson County, Colorado. It reports serving 9,348 people through 3,415 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
9,348
Service connections
3,415
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Willowbrook Wsd compare with other water systems in Jefferson County?
By EPA's size categories, Willowbrook Wsd is a medium system (3,301 to 10,000 people). Jefferson County has 112 active public water systems. Its population served is about 81% above the county average of 5,159 people per system, and accounts for 1.6% of the 577,783 people reported by systems filed under the county. Across Colorado, the 2,207 active systems average 3,400 people each. Nationally, the average active community water system reports serving 6,703 people, so Willowbrook Wsd is about 39% above 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. Colorado has 1,068 active community water systems, 48% of the state's 2,207 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 337 Colorado systems (15%) list purchased surface water as their primary source.
Who owns and regulates Willowbrook Wsd?
EPA lists Willowbrook Wsd as owned by a local government. The CO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 39 of the 112 active systems in Jefferson County (35%) are also owned by a local government.
Does Willowbrook Wsd have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Willowbrook Wsd. For the latest compliance status, check EPA ECHO for current compliance history.
Willowbrook Wsd: frequently asked questions
Who runs Willowbrook Wsd?
Willowbrook Wsd (PWSID CO0130843) is a community water system owned by a local government. It is regulated by the CO state drinking water program.
How many people does Willowbrook Wsd serve?
Willowbrook Wsd reports serving 9,348 people through 3,415 service connections in Jefferson County, Colorado.
Where does Willowbrook Wsd get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Willowbrook Wsd have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Willowbrook Wsd'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 Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.
Where can I find Willowbrook Wsd's water quality report?
As a community water system, Willowbrook Wsd 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 Jefferson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Arvada City of | Jefferson | 171,610 | Community | Surface water |
| Consolidated Mutual Maple Grove | Jefferson | 81,400 | Community | Surface water |
| Green Mountain Wsd | Jefferson | 49,400 | Community | Purchased surface water |
| Bancroft Clover Wsd | Jefferson | 44,000 | Community | Purchased surface water |
| Golden City of | Jefferson | 38,288 | Community | Surface water |
| Bear Creek Wsd | Jefferson | 30,000 | 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, “Willowbrook Wsd, PWSID CO0130843, Colorado”, https://aquacensus.com/water-systems/colorado/willowbrook-wsd-co0130843 (data as of October 1, 2026).