Public water system · CA2100581
ActiveHog Island Oyster Co.
At a glance
Hog Island Oyster Co. (PWSID CA2100581) is an active transient non-community water system in Marin County, California. It reports serving 172 people through 3 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
172
Service connections
3
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Hog Island Oyster Co. compare with other water systems in Marin County?
By EPA's size categories, Hog Island Oyster Co. is a very small system (500 people or fewer). 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 less than 0.1% 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 Hog Island Oyster Co. is about 20% above 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 Hog Island Oyster Co.?
EPA lists Hog Island Oyster Co. 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. 22 of the 46 active systems in Marin County (48%) are also privately owned.
Does Hog Island Oyster Co. 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 Hog Island Oyster Co.. For the latest compliance status, check EPA ECHO for current compliance history.
Hog Island Oyster Co.: frequently asked questions
Who runs Hog Island Oyster Co.?
Hog Island Oyster Co. (PWSID CA2100581) is a transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Hog Island Oyster Co. serve?
Hog Island Oyster Co. reports serving 172 people through 3 service connections in Marin County, California.
Where does Hog Island Oyster Co. 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 Hog Island Oyster Co. have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Hog Island Oyster Co.'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 Hog Island Oyster Co.'s water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Hog Island Oyster Co. 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, “Hog Island Oyster Co., PWSID CA2100581, California”, https://aquacensus.com/water-systems/california/hog-island-oyster-co-ca2100581 (data as of October 1, 2026).