Public water system · CA3900714
ActiveSunnyside Estates Water System
At a glance
Sunnyside Estates Water System (PWSID CA3900714) is an active community water system in San Joaquin County, California. It reports serving 69 people through 21 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in April 2011.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
69
Service connections
21
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Sunnyside Estates Water System compare with other water systems in San Joaquin County?
By EPA's size categories, Sunnyside Estates Water System is a very small system (500 people or fewer). San Joaquin County has 302 active public water systems. Its population served is well below the county average of 2,571 people per system, and accounts for less than 0.1% of the 776,334 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 Sunnyside Estates Water System is well below 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 Sunnyside Estates Water System?
EPA lists Sunnyside Estates Water System 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. 69 of the 302 active systems in San Joaquin County (23%) are also owned by a local government.
Does Sunnyside Estates Water System have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in April 2011. The violations listed here began between October 1980 and April 2011. By type: 2 monitoring and reporting, 1 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Gross alpha (excluding radon and uranium) (2 of them). EPA lists 2 as resolved and 2 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2011-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1981-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 1980-10-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 4 violations in EPA's records, newest first.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.
Sunnyside Estates Water System: frequently asked questions
Who runs Sunnyside Estates Water System?
Sunnyside Estates Water System (PWSID CA3900714) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Sunnyside Estates Water System serve?
Sunnyside Estates Water System reports serving 69 people through 21 service connections in San Joaquin County, California.
Where does Sunnyside Estates Water System 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 Sunnyside Estates Water System have any drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in April 2011. 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 Sunnyside Estates Water System'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 4 violations for this system; 1 is health-based, and the most recent began in April 2011. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Sunnyside Estates Water System's water quality report?
As a community water system, Sunnyside Estates Water System 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 Joaquin County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Stockton | San Joaquin | 191,302 | Community | Surface water |
| California Water Service - Stockton | San Joaquin | 176,266 | Community | Purchased surface water |
| Tracy, City of | San Joaquin | 96,609 | Community | Surface water |
| Manteca, City of | San Joaquin | 84,928 | Community | Purchased surface water |
| Lodi, City of | San Joaquin | 68,272 | Community | Surface water |
| City of Lathrop | San Joaquin | 35,080 | 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, “Sunnyside Estates Water System, PWSID CA3900714, California”, https://aquacensus.com/water-systems/california/sunnyside-estates-water-system-ca3900714 (data as of October 1, 2026).