Public water system · CA5201140
ActiveAntoinette Mutual Water Co
At a glance
Antoinette Mutual Water Co (PWSID CA5201140) is an active community water system in Tehama County, California. It reports serving 25 people through 12 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
25
Service connections
12
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Antoinette Mutual Water Co compare with other water systems in Tehama County?
By EPA's size categories, Antoinette Mutual Water Co is a very small system (500 people or fewer). Tehama County has 109 active public water systems. Its population served is well below the county average of 474 people per system, and accounts for less than 0.1% of the 51,627 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 Antoinette Mutual Water Co 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 Antoinette Mutual Water Co?
EPA lists Antoinette Mutual Water Co 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. 69 of the 109 active systems in Tehama County (63%) are also privately owned.
Does Antoinette Mutual Water Co have drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 2025. The violations listed here began between January 2013 and October 2025. By type: 4 monitoring and reporting, 1 reporting and 1 required treatment not met. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 3 as unaddressed and 3 as resolved. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. 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 |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2024-10-17 | ReportingLSL Reporting · code 4G | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Unaddressed |
| 2015-09-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2015-08-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2013-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
All 6 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.
Antoinette Mutual Water Co: frequently asked questions
Who runs Antoinette Mutual Water Co?
Antoinette Mutual Water Co (PWSID CA5201140) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Antoinette Mutual Water Co serve?
Antoinette Mutual Water Co reports serving 25 people through 12 service connections in Tehama County, California.
Where does Antoinette Mutual Water Co 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 Antoinette Mutual Water Co have any drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 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 Antoinette Mutual Water Co'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 6 violations for this system; 1 is health-based, and the most recent began in October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Antoinette Mutual Water Co's water quality report?
As a community water system, Antoinette Mutual Water Co 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 Tehama County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Red Bluff | Tehama | 14,710 | Community | Groundwater |
| City of Corning | Tehama | 8,244 | Community | Groundwater |
| Rio Alto Water District | Tehama | 3,329 | Community | Groundwater |
| Caltrans-Red Bluff Rest-Nb | Tehama | 2,600 | Transient non-community | Groundwater |
| Caltrans-Red Bluff Rest-Sb | Tehama | 2,500 | Transient non-community | Groundwater |
| Los Molinos Comm. Services Dist. | Tehama | 1,450 | 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, “Antoinette Mutual Water Co, PWSID CA5201140, California”, https://aquacensus.com/water-systems/california/antoinette-mutual-water-co-ca5201140 (data as of October 1, 2026).