Public water system · CA1910007
ActiveAzusa Light and Water
At a glance
Azusa Light and Water (PWSID CA1910007) is an active community water system in Los Angeles County, California. It reports serving 110,044 people through 23,309 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is health-based, and the most recent began in October 1992.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
110,044
Service connections
23,309
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Azusa Light and Water compare with other water systems in Los Angeles County?
By EPA's size categories, Azusa Light and Water is a very large system (more than 100,000 people). Los Angeles County has 275 active public water systems. Its population served is about 199% above the county average of 36,762 people per system, and accounts for 1.1% of the 10,109,668 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 Azusa Light and Water is about 16 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 Azusa Light and Water?
EPA lists Azusa Light and Water 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. 100 of the 275 active systems in Los Angeles County (36%) are also owned by a local government.
Does Azusa Light and Water have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in October 1992. By type: 1 contaminant level above the legal limit. The contaminant or rule involved is Total coliform bacteria (TCR). EPA lists 1 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 |
|---|---|---|---|---|
| 1992-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
The one violation in EPA's records.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.
Azusa Light and Water: frequently asked questions
Who runs Azusa Light and Water?
Azusa Light and Water (PWSID CA1910007) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Azusa Light and Water serve?
Azusa Light and Water reports serving 110,044 people through 23,309 service connections in Los Angeles County, California.
Where does Azusa Light and Water 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 Azusa Light and Water have any drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in October 1992. 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 Azusa Light and Water'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 one violation for this system; it is health-based, and the most recent began in October 1992. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Azusa Light and Water's water quality report?
As a community water system, Azusa Light and Water 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 Los Angeles County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Los Angeles-City, Dept. of Water & Power | Los Angeles | 3,875,566 | Community | Surface water |
| Long Beach Utilities Department | Los Angeles | 466,772 | Community | Purchased surface water |
| Santa Clarita Valley Water Agency | Los Angeles | 294,090 | Community | Surface water |
| Gswc - Southwest | Los Angeles | 277,740 | Community | Purchased surface water |
| San Gabriel Valley Water Co.-El Monte | Los Angeles | 248,000 | Community | Groundwater |
| Los Angeles Cwwd 40 Reg 4 & 34 Lancaster | Los Angeles | 208,129 | 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, “Azusa Light and Water, PWSID CA1910007, California”, https://aquacensus.com/water-systems/california/azusa-light-and-water-ca1910007 (data as of October 1, 2026).