Public water system · CA3910023
ActiveOakwood Lake Water District-Subdivision
At a glance
Oakwood Lake Water District-Subdivision (PWSID CA3910023) is an active community water system in San Joaquin County, California. It reports serving 1,479 people through 448 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in October 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,479
Service connections
448
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Oakwood Lake Water District-Subdivision compare with other water systems in San Joaquin County?
By EPA's size categories, Oakwood Lake Water District-Subdivision is a small system (501 to 3,300 people). San Joaquin County has 302 active public water systems. Its population served is about 42% below the county average of 2,571 people per system, and accounts for 0.2% 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 Oakwood Lake Water District-Subdivision 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 Oakwood Lake Water District-Subdivision?
EPA lists Oakwood Lake Water District-Subdivision 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 Oakwood Lake Water District-Subdivision have drinking water violations?
EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in October 2014. The violations listed here began between July 1987 and October 2014. By type: 3 monitoring and reporting, 3 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 6 as resolved and 1 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 |
|---|---|---|---|---|
| 2014-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2001-06-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1998-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1997-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1994-11-01 | 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 |
| 1987-07-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
All 7 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.
Oakwood Lake Water District-Subdivision: frequently asked questions
Who runs Oakwood Lake Water District-Subdivision?
Oakwood Lake Water District-Subdivision (PWSID CA3910023) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Oakwood Lake Water District-Subdivision serve?
Oakwood Lake Water District-Subdivision reports serving 1,479 people through 448 service connections in San Joaquin County, California.
Where does Oakwood Lake Water District-Subdivision 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 Oakwood Lake Water District-Subdivision have any drinking water violations?
EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in October 2014. 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 Oakwood Lake Water District-Subdivision'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 7 violations for this system; 3 are health-based, and the most recent began in October 2014. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Oakwood Lake Water District-Subdivision's water quality report?
As a community water system, Oakwood Lake Water District-Subdivision 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, “Oakwood Lake Water District-Subdivision, PWSID CA3910023, California”, https://aquacensus.com/water-systems/california/oakwood-lake-water-district-subdivision-ca3910023 (data as of October 1, 2026).