Public water system · CA2210500
ActiveYosemite Nps-May Lake Camp
At a glance
Yosemite Nps-May Lake Camp (PWSID CA2210500) is an active transient non-community water system in Mariposa County, California. It reports serving 300 people through 5 service connections. Its primary water source is surface water, and EPA lists it as owned by the federal government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
300
Service connections
5
Primary source
SW
Surface water
System type
TNCWS
Transient non-community water system
System record
How does Yosemite Nps-May Lake Camp compare with other water systems in Mariposa County?
By EPA's size categories, Yosemite Nps-May Lake Camp is a very small system (500 people or fewer). Mariposa County has 67 active public water systems. Its population served is about 21% below the county average of 381 people per system, and accounts for 1.2% of the 25,508 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 Yosemite Nps-May Lake Camp is about twice 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates Yosemite Nps-May Lake Camp?
EPA lists Yosemite Nps-May Lake Camp as owned by the federal 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. 13 of the 67 active systems in Mariposa County (19%) are also owned by the federal government.
Does Yosemite Nps-May Lake Camp 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 Yosemite Nps-May Lake Camp. For the latest compliance status, check EPA ECHO for current compliance history.
Yosemite Nps-May Lake Camp: frequently asked questions
Who runs Yosemite Nps-May Lake Camp?
Yosemite Nps-May Lake Camp (PWSID CA2210500) is a transient non-community water system owned by the federal government. It is regulated by the CA state drinking water program.
How many people does Yosemite Nps-May Lake Camp serve?
Yosemite Nps-May Lake Camp reports serving 300 people through 5 service connections in Mariposa County, California.
Where does Yosemite Nps-May Lake Camp get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Yosemite Nps-May Lake Camp have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Yosemite Nps-May Lake Camp'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 Yosemite Nps-May Lake Camp's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Yosemite Nps-May Lake Camp 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 Mariposa County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Yosemite Nps-Glacier Point | Mariposa | 4,000 | Transient non-community | Surface water |
| Blm-Briceburg Water System | Mariposa | 3,196 | Transient non-community | Groundwater |
| Mariposa Public Utility Dist | Mariposa | 2,000 | Community | Surface water |
| Yosemite Nps-Bridalveil Fall | Mariposa | 1,163 | Transient non-community | Groundwater |
| Mid - Mc Swain Rec Area | Mariposa | 1,119 | Transient non-community | Surface water |
| Yosemite Nps-Yosemite Valley | Mariposa | 1,000 | 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, “Yosemite Nps-May Lake Camp, PWSID CA2210500, California”, https://aquacensus.com/water-systems/california/yosemite-nps-may-lake-camp-ca2210500 (data as of October 1, 2026).