Public water system · CA0500106
ActiveMountain Ranch Water System
At a glance
Mountain Ranch Water System (PWSID CA0500106) is an active transient non-community water system in Calaveras County, California. It reports serving 150 people through 4 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
150
Service connections
4
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Mountain Ranch Water System compare with other water systems in Calaveras County?
By EPA's size categories, Mountain Ranch Water System 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 0.3% 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 Mountain Ranch Water System is roughly in line with 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 Mountain Ranch Water System?
EPA lists Mountain Ranch 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. 34 of the 51 active systems in Calaveras County (67%) are also privately owned.
Does Mountain Ranch Water System have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Mountain Ranch Water System. For the latest compliance status, check EPA ECHO for current compliance history.
Mountain Ranch Water System: frequently asked questions
Who runs Mountain Ranch Water System?
Mountain Ranch Water System (PWSID CA0500106) is a transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Mountain Ranch Water System serve?
Mountain Ranch Water System reports serving 150 people through 4 service connections in Calaveras County, California.
Where does Mountain Ranch 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 Mountain Ranch Water System have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Mountain Ranch 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 Safe Drinking Water Act records list no violations for this system. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Mountain Ranch Water System's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Mountain Ranch 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 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, “Mountain Ranch Water System, PWSID CA0500106, California”, https://aquacensus.com/water-systems/california/mountain-ranch-water-system-ca0500106 (data as of October 1, 2026).