Public water system · CA5810001
ActiveCal-Water Service Co.-Marysville
At a glance
Cal-Water Service Co.-Marysville (PWSID CA5810001) is an active community water system in Yuba County, California. It reports serving 12,419 people through 3,721 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is health-based, and the most recent began in January 1993.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
12,419
Service connections
3,721
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Cal-Water Service Co.-Marysville compare with other water systems in Yuba County?
By EPA's size categories, Cal-Water Service Co.-Marysville is a large system (10,001 to 100,000 people). Yuba County has 62 active public water systems, and Cal-Water Service Co.-Marysville is the 4th-largest of them by population served. Its population served is about 6.8 times the county average of 1,823 people per system, and accounts for 11% of the 113,008 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 Cal-Water Service Co.-Marysville is about 85% above 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 Cal-Water Service Co.-Marysville?
EPA lists Cal-Water Service Co.-Marysville 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. 53 of the 62 active systems in Yuba County (85%) are also privately owned.
Does Cal-Water Service Co.-Marysville have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in January 1993. 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 |
|---|---|---|---|---|
| 1993-01-01 | 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.
Cal-Water Service Co.-Marysville: frequently asked questions
Who runs Cal-Water Service Co.-Marysville?
Cal-Water Service Co.-Marysville (PWSID CA5810001) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Cal-Water Service Co.-Marysville serve?
Cal-Water Service Co.-Marysville reports serving 12,419 people through 3,721 service connections in Yuba County, California.
Where does Cal-Water Service Co.-Marysville 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 Cal-Water Service Co.-Marysville have any drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in January 1993. 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 Cal-Water Service Co.-Marysville'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 January 1993. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Cal-Water Service Co.-Marysville's water quality report?
As a community water system, Cal-Water Service Co.-Marysville 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 Yuba County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Linda County Water District | Yuba | 21,654 | Community | Groundwater |
| Yuba County Motorplex | Yuba | 18,000 | Transient non-community | Groundwater |
| Olivehurst Public U.D. | Yuba | 16,595 | Community | Groundwater |
| Plumas Lake | Yuba | 10,464 | Community | Groundwater |
| Beale Air Force Base | Yuba | 6,785 | Community | Groundwater |
| Lake of the Springs | Yuba | 6,500 | Non-transient non-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, “Cal-Water Service Co.-Marysville, PWSID CA5810001, California”, https://aquacensus.com/water-systems/california/cal-water-service-co-marysville-ca5810001 (data as of October 1, 2026).