Public water system · CA5103005
ActiveOswald Water System
At a glance
Oswald Water System (PWSID CA5103005) is an active transient non-community water system in Sutter County, California. It reports serving 25 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
25
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Oswald Water System compare with other water systems in Sutter County?
By EPA's size categories, Oswald Water System is a very small system (500 people or fewer). Sutter County has 35 active public water systems. Its population served is well below the county average of 2,514 people per system, and accounts for less than 0.1% of the 87,991 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Oswald Water System is well below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. California has 3,016 active transient non-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 Oswald Water System?
EPA lists Oswald Water System as privately owned. 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. 23 of the 35 active systems in Sutter County (66%) are also privately owned.
Does Oswald Water System have drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2025. The violations listed here began between October 1985 and July 2025. By type: 3 monitoring and reporting, 2 monitoring and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 5 as archived and 2 as resolved. 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. 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 |
|---|---|---|---|---|
| 2025-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2002-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2001-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1998-02-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1998-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 1985-10-24 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Mercurycode 1035 | Yes | 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.
Oswald Water System: frequently asked questions
Who runs Oswald Water System?
Oswald Water System (PWSID CA5103005) is a transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Oswald Water System serve?
Oswald Water System reports serving 25 people through 1 service connection in Sutter County, California.
Where does Oswald Water System 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 Oswald Water System have any drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2025. 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 Oswald Water System'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; 2 are health-based, and the most recent began in July 2025. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Oswald Water System's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Oswald Water System is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Sutter County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Yuba City | Sutter | 70,256 | Community | Surface water |
| City of Live Oak | Sutter | 9,285 | Community | Groundwater |
| Sutter Community S.D. | Sutter | 2,904 | Community | Groundwater |
| National American Corp. Lp-Lake Minden | Sutter | 1,065 | Transient non-community | Groundwater |
| Church of Glad Tidings | Sutter | 878 | Non-transient non-community | Groundwater |
| Wildewood East Mutual | Sutter | 350 | 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, “Oswald Water System, PWSID CA5103005, California”, https://aquacensus.com/water-systems/california/oswald-water-system-ca5103005 (data as of October 1, 2026).