Public water system · CA4810008
ActiveCity of Vacaville
At a glance
City of Vacaville (PWSID CA4810008) is an active community water system in Solano County, California. It reports serving 99,650 people through 30,935 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; none is health-based, and the most recent began in October 2001.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
99,650
Service connections
30,935
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of Vacaville compare with other water systems in Solano County?
By EPA's size categories, City of Vacaville is a large system (10,001 to 100,000 people). Solano County has 63 active public water systems, and City of Vacaville is the 3rd-largest of them by population served. Its population served is about 13 times the county average of 7,509 people per system, and accounts for 21% 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 City of Vacaville is about 15 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates City of Vacaville?
EPA lists City of Vacaville 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. 19 of the 63 active systems in Solano County (30%) are also owned by a local government.
Does City of Vacaville have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in October 2001. The violations listed here began between May 1995 and October 2001. By type: 2 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Radium-226 (2 of them). EPA lists 3 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 |
|---|---|---|---|---|
| 2001-10-01 | Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04 | Radium-226code 4020 | No | Resolved |
| 1999-10-01 | Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04 | Radium-226code 4020 | No | Resolved |
| 1995-05-09 | Public notice, recordkeeping or otherOperations Report · code 10 | Not reported | No | Resolved |
All 3 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.
City of Vacaville: frequently asked questions
Who runs City of Vacaville?
City of Vacaville (PWSID CA4810008) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does City of Vacaville serve?
City of Vacaville reports serving 99,650 people through 30,935 service connections in Solano County, California.
Where does City of Vacaville get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does City of Vacaville have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in October 2001. 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 City of Vacaville'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 3 violations for this system; none is health-based, and the most recent began in October 2001. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find City of Vacaville's water quality report?
As a community water system, City of Vacaville 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 |
| 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 |
| City of Dixon | Solano | 12,540 | Community | Groundwater |
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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, “City of Vacaville, PWSID CA4810008, California”, https://aquacensus.com/water-systems/california/city-of-vacaville-ca4810008 (data as of October 1, 2026).