Public water system · CA3710021
ActiveSan Dieguito Wd
At a glance
San Dieguito Wd (PWSID CA3710021) is an active community water system in San Diego County, California. It reports serving 40,405 people through 12,154 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
40,405
Service connections
12,154
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does San Dieguito Wd compare with other water systems in San Diego County?
By EPA's size categories, San Dieguito Wd is a large system (10,001 to 100,000 people). San Diego County has 191 active public water systems. Its population served is about twice the county average of 19,427 people per system, and accounts for 1.1% 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 San Dieguito Wd is about 6 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 San Dieguito Wd?
EPA lists San Dieguito Wd 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. 58 of the 191 active systems in San Diego County (30%) are also owned by a local government.
Does San Dieguito Wd have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2022. By type: 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper 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 |
|---|---|---|---|---|
| 2022-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | 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.
San Dieguito Wd: frequently asked questions
Who runs San Dieguito Wd?
San Dieguito Wd (PWSID CA3710021) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does San Dieguito Wd serve?
San Dieguito Wd reports serving 40,405 people through 12,154 service connections in San Diego County, California.
Where does San Dieguito Wd 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 San Dieguito Wd 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 October 2022. 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 San Dieguito Wd'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 October 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find San Dieguito Wd's water quality report?
As a community water system, San Dieguito Wd 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 |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “San Dieguito Wd, PWSID CA3710021, California”, https://aquacensus.com/water-systems/california/san-dieguito-wd-ca3710021 (data as of October 1, 2026).