Public water system · CA3010073
ActiveMoulton Niguel Water District
At a glance
Moulton Niguel Water District (PWSID CA3010073) is an active community water system in Orange County, California. It reports serving 170,236 people through 52,666 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
170,236
Service connections
52,666
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Moulton Niguel Water District compare with other water systems in Orange County?
By EPA's size categories, Moulton Niguel Water District is a very large system (more than 100,000 people). Orange County has 46 active public water systems, and Moulton Niguel Water District is the 6th-largest of them by population served. Its population served is about 145% above the county average of 69,606 people per system, and accounts for 5.3% 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 Moulton Niguel Water District is about 25 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 Moulton Niguel Water District?
EPA lists Moulton Niguel 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 Moulton Niguel Water District have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Moulton Niguel Water District. For the latest compliance status, check EPA ECHO for current compliance history.
Moulton Niguel Water District: frequently asked questions
Who runs Moulton Niguel Water District?
Moulton Niguel Water District (PWSID CA3010073) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Moulton Niguel Water District serve?
Moulton Niguel Water District reports serving 170,236 people through 52,666 service connections in Orange County, California.
Where does Moulton Niguel 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 Moulton Niguel Water District have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Moulton Niguel 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 Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Moulton Niguel Water District's water quality report?
As a community water system, Moulton Niguel 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 |
| Santa Margarita Water District | Orange | 168,289 | 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, “Moulton Niguel Water District, PWSID CA3010073, California”, https://aquacensus.com/water-systems/california/moulton-niguel-water-district-ca3010073 (data as of October 1, 2026).