Public water system · CA4810002
ActiveCalifornia Water Service Co. - Dixon
At a glance
California Water Service Co. - Dixon (PWSID CA4810002) is an active community water system in Solano County, California. It reports serving 10,623 people through 3,067 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in June 1993.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
10,623
Service connections
3,067
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does California Water Service Co. - Dixon compare with other water systems in Solano County?
By EPA's size categories, California Water Service Co. - Dixon is a large system (10,001 to 100,000 people). Solano County has 63 active public water systems. Its population served is about 41% above the county average of 7,509 people per system, and accounts for 2.2% of the 473,083 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 California Water Service Co. - Dixon is about 58% 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. California has 2,997 active community water systems, 40% of the state's 7,479 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,179 California systems (83%) list groundwater as their primary source.
Who owns and regulates California Water Service Co. - Dixon?
EPA lists California Water Service Co. - Dixon 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. 40 of the 63 active systems in Solano County (63%) are also privately owned.
Does California Water Service Co. - Dixon have drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in June 1993. The violations listed here began between October 1992 and June 1993. By type: 1 monitoring and reporting and 1 contaminant level above the legal limit. The contaminants or rules involved are Lead and Copper Rule and Total coliform bacteria (TCR). 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 |
|---|---|---|---|---|
| 1993-06-30 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1992-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
California Water Service Co. - Dixon: frequently asked questions
Who runs California Water Service Co. - Dixon?
California Water Service Co. - Dixon (PWSID CA4810002) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does California Water Service Co. - Dixon serve?
California Water Service Co. - Dixon reports serving 10,623 people through 3,067 service connections in Solano County, California.
Where does California Water Service Co. - Dixon 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 California Water Service Co. - Dixon have any drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in June 1993. 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 California Water Service Co. - Dixon'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; 1 is health-based, and the most recent began in June 1993. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find California Water Service Co. - Dixon's water quality report?
As a community water system, California Water Service Co. - Dixon 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 Solano County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Vallejo | Solano | 121,420 | Community | Surface water |
| City of Fairfield | Solano | 120,377 | Community | Surface water |
| City of Vacaville | Solano | 99,650 | Community | Surface water |
| Suisun-Solano Water Authority | Solano | 29,105 | Community | Surface water |
| City of Benicia | Solano | 27,131 | Community | Surface water |
| California Water Service Co.-Travis Afb | Solano | 18,111 | 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, “California Water Service Co. - Dixon, PWSID CA4810002, California”, https://aquacensus.com/water-systems/california/california-water-service-co-dixon-ca4810002 (data as of October 1, 2026).