Public water system · CA5000015
ActiveOid #22 - Williams Tract
At a glance
Oid #22 - Williams Tract (PWSID CA5000015) is an active community water system in Stanislaus County, California. It reports serving 150 people through 53 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 2 are health-based, and the most recent began in May 1997.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
150
Service connections
53
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Oid #22 - Williams Tract compare with other water systems in Stanislaus County?
By EPA's size categories, Oid #22 - Williams Tract 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 Oid #22 - Williams Tract 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 #22 - Williams Tract?
EPA lists Oid #22 - Williams Tract 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 #22 - Williams Tract have drinking water violations?
EPA's records list 4 violations for this system; 2 are health-based, and the most recent began in May 1997. The violations listed here began between October 1980 and May 1997. By type: 2 contaminant level above the legal limit and 2 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 as resolved and 2 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 |
|---|---|---|---|---|
| 1997-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1996-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1981-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 1980-10-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 4 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.
Oid #22 - Williams Tract: frequently asked questions
Who runs Oid #22 - Williams Tract?
Oid #22 - Williams Tract (PWSID CA5000015) 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 #22 - Williams Tract serve?
Oid #22 - Williams Tract reports serving 150 people through 53 service connections in Stanislaus County, California.
Where does Oid #22 - Williams Tract 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 #22 - Williams Tract have any drinking water violations?
EPA's records list 4 violations for this system; 2 are health-based, and the most recent began in May 1997. 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 #22 - Williams Tract'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 4 violations for this system; 2 are health-based, and the most recent began in May 1997. 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 #22 - Williams Tract's water quality report?
As a community water system, Oid #22 - Williams Tract 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 #22 - Williams Tract, PWSID CA5000015, California”, https://aquacensus.com/water-systems/california/oid-22-williams-tract-ca5000015 (data as of October 1, 2026).