Public water system · CA1910212
ActiveGswc-South Arcadia
At a glance
Gswc-South Arcadia (PWSID CA1910212) is an active community water system in Los Angeles County, California. It reports serving 27,072 people through 7,666 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in June 2000.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
27,072
Service connections
7,666
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Gswc-South Arcadia compare with other water systems in Los Angeles County?
By EPA's size categories, Gswc-South Arcadia is a large system (10,001 to 100,000 people). Los Angeles County has 275 active public water systems. Its population served is about 26% below the county average of 36,762 people per system, and accounts for 0.3% 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 Gswc-South Arcadia is about 4 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,179 California systems (83%) list groundwater as their primary source.
Who owns and regulates Gswc-South Arcadia?
EPA lists Gswc-South Arcadia as privately owned. 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. 150 of the 275 active systems in Los Angeles County (55%) are also privately owned.
Does Gswc-South Arcadia have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in June 2000. By type: 1 public notice, recordkeeping or other. 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 |
|---|---|---|---|---|
| 2000-06-20 | Public notice, recordkeeping or otherOperations Report · code 10 | Not reported | No | 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.
Gswc-South Arcadia: frequently asked questions
Who runs Gswc-South Arcadia?
Gswc-South Arcadia (PWSID CA1910212) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Gswc-South Arcadia serve?
Gswc-South Arcadia reports serving 27,072 people through 7,666 service connections in Los Angeles County, California.
Where does Gswc-South Arcadia get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Gswc-South Arcadia have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in June 2000. 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 Gswc-South Arcadia'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 not health-based, and the most recent began in June 2000. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Gswc-South Arcadia's water quality report?
As a community water system, Gswc-South Arcadia 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, “Gswc-South Arcadia, PWSID CA1910212, California”, https://aquacensus.com/water-systems/california/gswc-south-arcadia-ca1910212 (data as of October 1, 2026).