Public water system · CA3010082
ActiveSerrano Water District
At a glance
Serrano Water District (PWSID CA3010082) is an active community water system in Orange County, California. It reports serving 5,659 people through 2,346 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in January 2004.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
5,659
Service connections
2,346
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Serrano Water District compare with other water systems in Orange County?
By EPA's size categories, Serrano Water District is a medium system (3,301 to 10,000 people). Orange County has 46 active public water systems. Its population served is well below the county average of 69,606 people per system, and accounts for 0.2% 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 Serrano Water District is about 16% 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 Serrano Water District?
EPA lists Serrano Water District 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 Serrano Water District have drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in January 2004. The violations listed here began between January 2004 and January 2004. By type: 1 monitoring and reporting and 1 required treatment not met. The contaminant or rule involved most often is Carbon, total (2 of them). 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 |
|---|---|---|---|---|
| 2004-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 2004-01-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | 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.
Serrano Water District: frequently asked questions
Who runs Serrano Water District?
Serrano Water District (PWSID CA3010082) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Serrano Water District serve?
Serrano Water District reports serving 5,659 people through 2,346 service connections in Orange County, California.
Where does Serrano Water District 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 Serrano Water District have any drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in January 2004. 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 Serrano Water District'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 January 2004. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Serrano Water District's water quality report?
As a community water system, Serrano Water District 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, “Serrano Water District, PWSID CA3010082, California”, https://aquacensus.com/water-systems/california/serrano-water-district-ca3010082 (data as of October 1, 2026).