Public water system · CA3010064
ActiveCity of Westminster
At a glance
City of Westminster (PWSID CA3010064) is an active community water system in Orange County, California. It reports serving 90,911 people through 20,763 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 2 are health-based, and the most recent began in January 2013.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
90,911
Service connections
20,763
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does City of Westminster compare with other water systems in Orange County?
By EPA's size categories, City of Westminster is a large system (10,001 to 100,000 people). Orange County has 46 active public water systems. Its population served is about 31% above the county average of 69,606 people per system, and accounts for 2.8% of the 3,201,893 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 Westminster 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 City of Westminster?
EPA lists City of Westminster 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. 34 of the 46 active systems in Orange County (74%) are also owned by a local government.
Does City of Westminster have drinking water violations?
EPA's records list 4 violations for this system; 2 are health-based, and the most recent began in January 2013. The violations listed here began between March 1989 and January 2013. By type: 2 contaminant level above the legal limit, 1 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 3 as resolved and 1 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 |
|---|---|---|---|---|
| 2013-01-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1993-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1989-03-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
All 4 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 Westminster: frequently asked questions
Who runs City of Westminster?
City of Westminster (PWSID CA3010064) 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 Westminster serve?
City of Westminster reports serving 90,911 people through 20,763 service connections in Orange County, California.
Where does City of Westminster 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 City of Westminster have any drinking water violations?
EPA's records list 4 violations for this system; 2 are health-based, and the most recent began in January 2013. 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 Westminster'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 4 violations for this system; 2 are health-based, and the most recent began in January 2013. 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 Westminster's water quality report?
As a community water system, City of Westminster 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 Orange County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Irvine Ranch Water District | Orange | 444,800 | Community | Surface water |
| City of Anaheim | Orange | 348,593 | Community | Surface water |
| City of Santa Ana | Orange | 310,539 | Community | Purchased surface water |
| City of Huntington Beach | Orange | 201,000 | Community | Purchased surface water |
| City of Garden Grove | Orange | 174,226 | Community | Purchased surface water |
| Moulton Niguel Water District | Orange | 170,236 | 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, “City of Westminster, PWSID CA3010064, California”, https://aquacensus.com/water-systems/california/city-of-westminster-ca3010064 (data as of October 1, 2026).