Public water system · CA0500057
ActiveCalifornia Caverns
At a glance
California Caverns (PWSID CA0500057) is an active transient non-community water system in Calaveras County, California. It reports serving 80 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; 1 is health-based, and the most recent began in January 2015.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
80
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does California Caverns compare with other water systems in Calaveras County?
By EPA's size categories, California Caverns is a very small system (500 people or fewer). Calaveras County has 51 active public water systems. Its population served is well below the county average of 1,102 people per system, and accounts for 0.1% of the 56,208 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 California Caverns is about 44% 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 California Caverns?
EPA lists California Caverns 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. 34 of the 51 active systems in Calaveras County (67%) are also privately owned.
Does California Caverns have drinking water violations?
EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in January 2015. The violations listed here began between October 2009 and January 2015. By type: 6 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2015-01-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-10-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2013-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2010-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2010-03-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2009-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
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.
California Caverns: frequently asked questions
Who runs California Caverns?
California Caverns (PWSID CA0500057) is a transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does California Caverns serve?
California Caverns reports serving 80 people through 1 service connection in Calaveras County, California.
Where does California Caverns 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 California Caverns have any drinking water violations?
EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in January 2015. 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 California Caverns' 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; 1 is health-based, and the most recent began in January 2015. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find California Caverns' water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. California Caverns 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 Calaveras County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ccwd - Ebbetts Pass | Calaveras | 11,545 | Community | Surface water |
| Ccwd - Jenny Lind | Calaveras | 9,861 | Community | Surface water |
| Calaveras PUD | Calaveras | 6,286 | Community | Surface water |
| Ccwd - Copper Cove | Calaveras | 5,187 | Community | Surface water |
| Blue Lake Springs Mut Wtr | Calaveras | 4,841 | Community | Purchased surface water |
| Union Public Utility District | Calaveras | 4,774 | Community | Surface water |
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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, “California Caverns, PWSID CA0500057, California”, https://aquacensus.com/water-systems/california/california-caverns-ca0500057 (data as of October 1, 2026).