Public water system · CA3910017
ActiveSan Joaquin County-Mokelumne Acres
At a glance
San Joaquin County-Mokelumne Acres (PWSID CA3910017) is an active community water system in San Joaquin County, California. It reports serving 3,802 people through 1,152 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,802
Service connections
1,152
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does San Joaquin County-Mokelumne Acres compare with other water systems in San Joaquin County?
By EPA's size categories, San Joaquin County-Mokelumne Acres is a medium system (3,301 to 10,000 people). San Joaquin County has 302 active public water systems. Its population served is about 48% above the county average of 2,571 people per system, and accounts for 0.5% 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-Mokelumne Acres is about 43% 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-Mokelumne Acres?
EPA lists San Joaquin County-Mokelumne Acres 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-Mokelumne Acres have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for San Joaquin County-Mokelumne Acres. For the latest compliance status, check EPA ECHO for current compliance history.
San Joaquin County-Mokelumne Acres: frequently asked questions
Who runs San Joaquin County-Mokelumne Acres?
San Joaquin County-Mokelumne Acres (PWSID CA3910017) 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-Mokelumne Acres serve?
San Joaquin County-Mokelumne Acres reports serving 3,802 people through 1,152 service connections in San Joaquin County, California.
Where does San Joaquin County-Mokelumne Acres 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-Mokelumne Acres have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is San Joaquin County-Mokelumne Acres' 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 Safe Drinking Water Act records list no violations for this system. 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-Mokelumne Acres' water quality report?
As a community water system, San Joaquin County-Mokelumne Acres 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-Mokelumne Acres, PWSID CA3910017, California”, https://aquacensus.com/water-systems/california/san-joaquin-county-mokelumne-acres-ca3910017 (data as of October 1, 2026).