Public water system · CA5000433
ActiveOid-Oakdale Rural Water System #1
At a glance
Oid-Oakdale Rural Water System #1 (PWSID CA5000433) is an active community water system in Stanislaus County, California. It reports serving 1,570 people through 479 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is health-based, and the most recent began in September 2005.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,570
Service connections
479
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Oid-Oakdale Rural Water System #1 compare with other water systems in Stanislaus County?
By EPA's size categories, Oid-Oakdale Rural Water System #1 is a small system (501 to 3,300 people). Stanislaus County has 191 active public water systems. Its population served is about 42% below the county average of 2,684 people per system, and accounts for 0.3% 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 Oid-Oakdale Rural Water System #1 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 Oid-Oakdale Rural Water System #1?
EPA lists Oid-Oakdale Rural Water System #1 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 Oid-Oakdale Rural Water System #1 have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in September 2005. By type: 1 contaminant level above the legal limit. The contaminant or rule involved is Total coliform bacteria (TCR). 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 |
|---|---|---|---|---|
| 2005-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
Oid-Oakdale Rural Water System #1: frequently asked questions
Who runs Oid-Oakdale Rural Water System #1?
Oid-Oakdale Rural Water System #1 (PWSID CA5000433) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Oid-Oakdale Rural Water System #1 serve?
Oid-Oakdale Rural Water System #1 reports serving 1,570 people through 479 service connections in Stanislaus County, California.
Where does Oid-Oakdale Rural Water System #1 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 Oid-Oakdale Rural Water System #1 have any drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in September 2005. 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 Oid-Oakdale Rural Water System #1'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 health-based, and the most recent began in September 2005. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Oid-Oakdale Rural Water System #1's water quality report?
As a community water system, Oid-Oakdale Rural Water System #1 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, “Oid-Oakdale Rural Water System #1, PWSID CA5000433, California”, https://aquacensus.com/water-systems/california/oid-oakdale-rural-water-system-1-ca5000433 (data as of October 1, 2026).