Public water system · CA5610001
ActiveDempsey Road Mutual Water Co
At a glance
Dempsey Road Mutual Water Co (PWSID CA5610001) is an active community water system in Ventura County, California. It reports serving 990 people through 283 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2009.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
990
Service connections
283
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Dempsey Road Mutual Water Co compare with other water systems in Ventura County?
By EPA's size categories, Dempsey Road Mutual Water Co 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 0.1% 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 Dempsey Road Mutual Water Co 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 Dempsey Road Mutual Water Co?
EPA lists Dempsey Road Mutual Water Co 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 Dempsey Road Mutual Water Co have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2009. The violations listed here began between July 1993 and July 2009. By type: 1 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminants or rules involved are Consumer Confidence Rule and Lead and Copper Rule. 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 |
|---|---|---|---|---|
| 2009-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | 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.
Dempsey Road Mutual Water Co: frequently asked questions
Who runs Dempsey Road Mutual Water Co?
Dempsey Road Mutual Water Co (PWSID CA5610001) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Dempsey Road Mutual Water Co serve?
Dempsey Road Mutual Water Co reports serving 990 people through 283 service connections in Ventura County, California.
Where does Dempsey Road Mutual Water Co 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 Dempsey Road Mutual Water Co have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2009. 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 Dempsey Road Mutual Water Co'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; none is health-based, and the most recent began in July 2009. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Dempsey Road Mutual Water Co's water quality report?
As a community water system, Dempsey Road Mutual Water Co 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, “Dempsey Road Mutual Water Co, PWSID CA5610001, California”, https://aquacensus.com/water-systems/california/dempsey-road-mutual-water-co-ca5610001 (data as of October 1, 2026).