Public water system · CA3710001
ActiveCal-Am Water Coronado
At a glance
Cal-Am Water Coronado (PWSID CA3710001) is an active community water system in San Diego County, California. It reports serving 106,000 people through 21,749 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's records list one violation for this system; it is health-based, and the most recent began in August 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
106,000
Service connections
21,749
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Cal-Am Water Coronado compare with other water systems in San Diego County?
By EPA's size categories, Cal-Am Water Coronado is a very large system (more than 100,000 people). San Diego County has 191 active public water systems. Its population served is about 5.5 times the county average of 19,427 people per system, and accounts for 2.9% of the 3,710,459 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 Cal-Am Water Coronado 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. 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 Cal-Am Water Coronado?
EPA lists Cal-Am Water Coronado 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. 101 of the 191 active systems in San Diego County (53%) are also privately owned.
Does Cal-Am Water Coronado have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in August 2023. By type: 1 contaminant level above the legal limit. The contaminant or rule involved is Revised Total Coliform Rule. 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 |
|---|---|---|---|---|
| 2023-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | 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.
Cal-Am Water Coronado: frequently asked questions
Who runs Cal-Am Water Coronado?
Cal-Am Water Coronado (PWSID CA3710001) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Cal-Am Water Coronado serve?
Cal-Am Water Coronado reports serving 106,000 people through 21,749 service connections in San Diego County, California.
Where does Cal-Am Water Coronado 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 Cal-Am Water Coronado have any drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in August 2023. 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 Cal-Am Water Coronado'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 August 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Cal-Am Water Coronado's water quality report?
As a community water system, Cal-Am Water Coronado 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 San Diego County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| San Diego, City of | San Diego | 1,385,379 | Community | Surface water |
| Helix Water District | San Diego | 277,668 | Community | Surface water |
| Otay Water District | San Diego | 238,008 | Community | Purchased surface water |
| Sweetwater Authority | San Diego | 191,282 | Community | Surface water |
| Oceanside, City of | San Diego | 171,483 | Community | Purchased surface water |
| Escondido, City of | San Diego | 137,044 | Community | 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, “Cal-Am Water Coronado, PWSID CA3710001, California”, https://aquacensus.com/water-systems/california/cal-am-water-coronado-ca3710001 (data as of October 1, 2026).