Public water system · CA2110301
ActiveCsp - Mt Tam Theatre Well
At a glance
Csp - Mt Tam Theatre Well (PWSID CA2110301) is an active transient non-community water system in Marin County, California. It reports serving 504 people through 7 service connections. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's records list one violation for this system; it is not health-based, and the most recent began in March 1987.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
504
Service connections
7
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Csp - Mt Tam Theatre Well compare with other water systems in Marin County?
By EPA's size categories, Csp - Mt Tam Theatre Well is a small system (501 to 3,300 people). Marin County has 46 active public water systems. Its population served is well below the county average of 6,203 people per system, and accounts for 0.2% of the 285,353 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 Csp - Mt Tam Theatre Well is about 3.5 times 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 Csp - Mt Tam Theatre Well?
EPA lists Csp - Mt Tam Theatre Well 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. 6 of the 46 active systems in Marin County (13%) are also owned by a state government.
Does Csp - Mt Tam Theatre Well have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in March 1987. By type: 1 public notice, recordkeeping or other. EPA lists 1 as archived. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1987-03-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
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.
Csp - Mt Tam Theatre Well: frequently asked questions
Who runs Csp - Mt Tam Theatre Well?
Csp - Mt Tam Theatre Well (PWSID CA2110301) 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 Csp - Mt Tam Theatre Well serve?
Csp - Mt Tam Theatre Well reports serving 504 people through 7 service connections in Marin County, California.
Where does Csp - Mt Tam Theatre Well 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 Csp - Mt Tam Theatre Well have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in March 1987. 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 Csp - Mt Tam Theatre Well'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 not health-based, and the most recent began in March 1987. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Csp - Mt Tam Theatre Well's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Csp - Mt Tam Theatre Well 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 Marin County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Marin Municipal Water District | Marin | 186,895 | Community | Surface water |
| North Marin Water District | Marin | 61,691 | Community | Surface water |
| Nps Ggnra | Marin | 18,447 | Community | Purchased surface water |
| Bolinas Community PUD | Marin | 2,483 | Community | Surface water |
| North Marin Wd - Pt. Reyes | Marin | 1,841 | Community | Groundwater |
| Csp - Angel Island St Park | Marin | 1,622 | 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, “Csp - Mt Tam Theatre Well, PWSID CA2110301, California”, https://aquacensus.com/water-systems/california/csp-mt-tam-theatre-well-ca2110301 (data as of October 1, 2026).