Public water system · CA2210909
ActiveMcusd - Mariposa Junior High School
At a glance
Mcusd - Mariposa Junior High School (PWSID CA2210909) is an active non-transient non-community water system in Mariposa County, California. It reports serving 134 people through 14 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
134
Service connections
14
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Mcusd - Mariposa Junior High School compare with other water systems in Mariposa County?
By EPA's size categories, Mcusd - Mariposa Junior High School is a very small system (500 people or fewer). Mariposa County has 67 active public water systems. Its population served is about 65% below the county average of 381 people per system, and accounts for 0.5% 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 non-transient non-community water system reports serving 430 people, so Mcusd - Mariposa Junior High School is well below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. California has 1,466 active non-transient non-community water systems, 20% 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 Mcusd - Mariposa Junior High School?
EPA lists Mcusd - Mariposa Junior High School as owned by a local 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. 21 of the 67 active systems in Mariposa County (31%) are also owned by a local government.
Does Mcusd - Mariposa Junior High School have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2018. By type: 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper Rule. EPA lists 1 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2018-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
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.
Mcusd - Mariposa Junior High School: frequently asked questions
Who runs Mcusd - Mariposa Junior High School?
Mcusd - Mariposa Junior High School (PWSID CA2210909) is a non-transient non-community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Mcusd - Mariposa Junior High School serve?
Mcusd - Mariposa Junior High School reports serving 134 people through 14 service connections in Mariposa County, California.
Where does Mcusd - Mariposa Junior High School 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 Mcusd - Mariposa Junior High School 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 October 2018. 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 Mcusd - Mariposa Junior High School'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 October 2018. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Mcusd - Mariposa Junior High School's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Mcusd - Mariposa Junior High School is a non-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, “Mcusd - Mariposa Junior High School, PWSID CA2210909, California”, https://aquacensus.com/water-systems/california/mcusd-mariposa-junior-high-school-ca2210909 (data as of October 1, 2026).