Public water system · CA3910024
ActiveSan Joaquin County - Wilkinson Manor
At a glance
San Joaquin County - Wilkinson Manor (PWSID CA3910024) is an active community water system in San Joaquin County, California. It reports serving 851 people through 258 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in August 2001.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
851
Service connections
258
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does San Joaquin County - Wilkinson Manor compare with other water systems in San Joaquin County?
By EPA's size categories, San Joaquin County - Wilkinson Manor is a small system (501 to 3,300 people). 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 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 San Joaquin County - Wilkinson Manor 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. 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 San Joaquin County - Wilkinson Manor?
EPA lists San Joaquin County - Wilkinson Manor 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 San Joaquin County - Wilkinson Manor have drinking water violations?
EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in August 2001. The violations listed here began between July 1993 and August 2001. By type: 2 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 3 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 |
|---|---|---|---|---|
| 2001-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1995-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
All 3 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.
San Joaquin County - Wilkinson Manor: frequently asked questions
Who runs San Joaquin County - Wilkinson Manor?
San Joaquin County - Wilkinson Manor (PWSID CA3910024) 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 Joaquin County - Wilkinson Manor serve?
San Joaquin County - Wilkinson Manor reports serving 851 people through 258 service connections in San Joaquin County, California.
Where does San Joaquin County - Wilkinson Manor 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 San Joaquin County - Wilkinson Manor have any drinking water violations?
EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in August 2001. 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 Joaquin County - Wilkinson Manor'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 3 violations for this system; 2 are health-based, and the most recent began in August 2001. 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 Joaquin County - Wilkinson Manor's water quality report?
As a community water system, San Joaquin County - Wilkinson Manor 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 |
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 Joaquin County - Wilkinson Manor, PWSID CA3910024, California”, https://aquacensus.com/water-systems/california/san-joaquin-county-wilkinson-manor-ca3910024 (data as of October 1, 2026).