Public water system · CA5010040
ActiveSouth San Joaquin Irrigation District
At a glance
South San Joaquin Irrigation District (PWSID CA5010040) is an active community water system in Stanislaus County, California. It reports serving 25 people through 8 service connections. Its primary water source is 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 April 2010.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
25
Service connections
8
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does South San Joaquin Irrigation District compare with other water systems in Stanislaus County?
By EPA's size categories, South San Joaquin Irrigation District is a very small system (500 people or fewer). Stanislaus County has 191 active public water systems. Its population served is well below the county average of 2,684 people per system, and accounts for less than 0.1% of the 512,656 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 South San Joaquin Irrigation District 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates South San Joaquin Irrigation District?
EPA lists South San Joaquin Irrigation District 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. 57 of the 191 active systems in Stanislaus County (30%) are also owned by a local government.
Does South San Joaquin Irrigation District have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in April 2010. By type: 1 public notice, recordkeeping or other. 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 |
|---|---|---|---|---|
| 2010-04-01 | Public notice, recordkeeping or otherVariance/Exemption/Other Compliance · code 08 | Not reported | 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.
South San Joaquin Irrigation District: frequently asked questions
Who runs South San Joaquin Irrigation District?
South San Joaquin Irrigation District (PWSID CA5010040) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does South San Joaquin Irrigation District serve?
South San Joaquin Irrigation District reports serving 25 people through 8 service connections in Stanislaus County, California.
Where does South San Joaquin Irrigation District get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does South San Joaquin Irrigation District 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 April 2010. 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 South San Joaquin Irrigation District'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 April 2010. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find South San Joaquin Irrigation District's water quality report?
As a community water system, South San Joaquin Irrigation District 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 Stanislaus County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Modesto, City of | Stanislaus | 218,771 | Community | Purchased surface water |
| Turlock, City of | Stanislaus | 72,682 | Community | Purchased surface water |
| Ceres, City of | Stanislaus | 54,513 | Community | Purchased surface water |
| Patterson, City of | Stanislaus | 24,977 | Community | Groundwater |
| Riverbank, City of | Stanislaus | 24,834 | Community | Groundwater |
| Oakdale, City of | Stanislaus | 23,235 | Community | Groundwater |
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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, “South San Joaquin Irrigation District, PWSID CA5010040, California”, https://aquacensus.com/water-systems/california/south-san-joaquin-irrigation-district-ca5010040 (data as of October 1, 2026).