Public water system · CA0310300
ActiveIndian Grinding Rock-Calaveras District
At a glance
Indian Grinding Rock-Calaveras District (PWSID CA0310300) is an active transient non-community water system in Amador County, California. It reports serving 63 people through 7 service connections. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
63
Service connections
7
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Indian Grinding Rock-Calaveras District compare with other water systems in Amador County?
By EPA's size categories, Indian Grinding Rock-Calaveras District is a very small system (500 people or fewer). Amador County has 67 active public water systems. Its population served is well below the county average of 645 people per system, and accounts for 0.1% of the 43,217 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 Indian Grinding Rock-Calaveras District is about 56% 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 Indian Grinding Rock-Calaveras District?
EPA lists Indian Grinding Rock-Calaveras District as owned by a state government. 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. 1 of the 67 active systems in Amador County (1.5%) are also owned by a state government.
Does Indian Grinding Rock-Calaveras District 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 Indian Grinding Rock-Calaveras District. For the latest compliance status, check EPA ECHO for current compliance history.
Indian Grinding Rock-Calaveras District: frequently asked questions
Who runs Indian Grinding Rock-Calaveras District?
Indian Grinding Rock-Calaveras District (PWSID CA0310300) is a transient non-community water system owned by a state government. It is regulated by the CA state drinking water program.
How many people does Indian Grinding Rock-Calaveras District serve?
Indian Grinding Rock-Calaveras District reports serving 63 people through 7 service connections in Amador County, California.
Where does Indian Grinding Rock-Calaveras District 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 Indian Grinding Rock-Calaveras District have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Indian Grinding Rock-Calaveras District'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 Indian Grinding Rock-Calaveras District's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Indian Grinding Rock-Calaveras District 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 Amador County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Awa Buckhorn Plant | Amador | 8,791 | Community | Surface water |
| Awa, Ione | Amador | 7,227 | Community | Surface water |
| City of Jackson | Amador | 5,019 | Community | Purchased surface water |
| Awa, Tanner | Amador | 4,940 | Community | Surface water |
| Jackson Valley Irrigation District | Amador | 3,553 | Community | Surface water |
| Awa - Camanche Village | Amador | 2,402 | 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, “Indian Grinding Rock-Calaveras District, PWSID CA0310300, California”, https://aquacensus.com/water-systems/california/indian-grinding-rock-calaveras-district-ca0310300 (data as of October 1, 2026).