Public water system · CA5610081
ActiveCal American Wc - Las Posas Estates
At a glance
Cal American Wc - Las Posas Estates (PWSID CA5610081) is an active community water system in Ventura County, California. It reports serving 2,039 people through 619 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,039
Service connections
619
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Cal American Wc - Las Posas Estates compare with other water systems in Ventura County?
By EPA's size categories, Cal American Wc - Las Posas Estates is a small system (501 to 3,300 people). Ventura County has 95 active public water systems. Its population served is well below the county average of 9,293 people per system, and accounts for 0.2% of the 882,799 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active community water system reports serving 6,703 people, so Cal American Wc - Las Posas Estates 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. California has 2,997 active community water systems, 40% of the state's 7,479 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 506 California systems (6.8%) list purchased surface water as their primary source.
Who owns and regulates Cal American Wc - Las Posas Estates?
EPA lists Cal American Wc - Las Posas Estates as privately owned. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 59 of the 95 active systems in Ventura County (62%) are also privately owned.
Does Cal American Wc - Las Posas Estates 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 Cal American Wc - Las Posas Estates. For the latest compliance status, check EPA ECHO for current compliance history.
Cal American Wc - Las Posas Estates: frequently asked questions
Who runs Cal American Wc - Las Posas Estates?
Cal American Wc - Las Posas Estates (PWSID CA5610081) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Cal American Wc - Las Posas Estates serve?
Cal American Wc - Las Posas Estates reports serving 2,039 people through 619 service connections in Ventura County, California.
Where does Cal American Wc - Las Posas Estates 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 Cal American Wc - Las Posas Estates have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Cal American Wc - Las Posas Estates' 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 CA state drinking water program.
Where can I find Cal American Wc - Las Posas Estates' water quality report?
As a community water system, Cal American Wc - Las Posas Estates 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 Ventura County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Oxnard Water Dept | Ventura | 200,232 | Community | Purchased surface water |
| Ventura Water Department | Ventura | 113,500 | Community | Surface water |
| Ventura Wwd No. 8 - Simi Valley | Ventura | 94,738 | Community | Purchased surface water |
| Cal American Water Co | Ventura | 66,809 | Community | Purchased surface water |
| City of Thousand Oaks Water Department | Ventura | 53,157 | Community | Purchased surface water |
| Camarillo Water Dept | Ventura | 46,824 | 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, “Cal American Wc - Las Posas Estates, PWSID CA5610081, California”, https://aquacensus.com/water-systems/california/cal-american-wc-las-posas-estates-ca5610081 (data as of October 1, 2026).