Public water system · CA5610023
ActiveVentura Wwd No. 8 - Simi Valley
At a glance
Ventura Wwd No. 8 - Simi Valley (PWSID CA5610023) is an active community water system in Ventura County, California. It reports serving 94,738 people through 25,902 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in January 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
94,738
Service connections
25,902
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Ventura Wwd No. 8 - Simi Valley compare with other water systems in Ventura County?
By EPA's size categories, Ventura Wwd No. 8 - Simi Valley is a large system (10,001 to 100,000 people). Ventura County has 95 active public water systems, and Ventura Wwd No. 8 - Simi Valley is the 3rd-largest of them by population served. Its population served is about 10 times the county average of 9,293 people per system, and accounts for 11% 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 Ventura Wwd No. 8 - Simi Valley is about 14 times 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 Ventura Wwd No. 8 - Simi Valley?
EPA lists Ventura Wwd No. 8 - Simi Valley as owned by a local government. 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. 29 of the 95 active systems in Ventura County (31%) are also owned by a local government.
Does Ventura Wwd No. 8 - Simi Valley have drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in January 2022. The violations listed here began between October 1979 and January 2022. By type: 4 monitoring and reporting and 1 contaminant level above the legal limit. The contaminants or rules involved are Nitrate, Total trihalomethanes (TTHM), Haloacetic acids (HAA5) and Total coliform bacteria (TCR). EPA lists 3 as resolved and 2 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 |
|---|---|---|---|---|
| 2022-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 2012-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2012-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2008-11-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1979-10-28 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Seleniumcode 1045 | Yes | Archived |
All 5 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.
Ventura Wwd No. 8 - Simi Valley: frequently asked questions
Who runs Ventura Wwd No. 8 - Simi Valley?
Ventura Wwd No. 8 - Simi Valley (PWSID CA5610023) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Ventura Wwd No. 8 - Simi Valley serve?
Ventura Wwd No. 8 - Simi Valley reports serving 94,738 people through 25,902 service connections in Ventura County, California.
Where does Ventura Wwd No. 8 - Simi Valley 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 Ventura Wwd No. 8 - Simi Valley have any drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in January 2022. 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 Ventura Wwd No. 8 - Simi Valley'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 5 violations for this system; 1 is health-based, and the most recent began in January 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Ventura Wwd No. 8 - Simi Valley's water quality report?
As a community water system, Ventura Wwd No. 8 - Simi Valley 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 |
| 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 |
| Golden State Water Company - Simi Valley | Ventura | 45,128 | 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, “Ventura Wwd No. 8 - Simi Valley, PWSID CA5610023, California”, https://aquacensus.com/water-systems/california/ventura-wwd-no-8-simi-valley-ca5610023 (data as of October 1, 2026).