Public water system · CA2600624
ActiveMammoth Mountain Ski Area - Outpost 14
At a glance
Mammoth Mountain Ski Area - Outpost 14 (PWSID CA2600624) is an active non-transient non-community water system in Mono County, California. It reports serving 7,736 people through 25 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in November 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
7,736
Service connections
25
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Mammoth Mountain Ski Area - Outpost 14 compare with other water systems in Mono County?
By EPA's size categories, Mammoth Mountain Ski Area - Outpost 14 is a medium system (3,301 to 10,000 people). Mono County has 84 active public water systems, and Mammoth Mountain Ski Area - Outpost 14 is the 2nd-largest of them by population served. Its population served is about 18 times the county average of 424 people per system, and accounts for 22% of the 35,602 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 Mammoth Mountain Ski Area - Outpost 14 is about 18 times 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 Mammoth Mountain Ski Area - Outpost 14?
EPA lists Mammoth Mountain Ski Area - Outpost 14 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. 46 of the 84 active systems in Mono County (55%) are also privately owned.
Does Mammoth Mountain Ski Area - Outpost 14 have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in November 2014. The violations listed here began between January 1984 and November 2014. By type: 6 monitoring and reporting and 6 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 6 as resolved and 6 as archived. 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. 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 |
|---|---|---|---|---|
| 2014-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2009-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2003-11-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2003-03-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1984-09-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1984-08-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1984-07-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1984-06-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1984-04-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1984-01-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
The 12 most recent violations in EPA's records, newest first.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.
Mammoth Mountain Ski Area - Outpost 14: frequently asked questions
Who runs Mammoth Mountain Ski Area - Outpost 14?
Mammoth Mountain Ski Area - Outpost 14 (PWSID CA2600624) is a non-transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Mammoth Mountain Ski Area - Outpost 14 serve?
Mammoth Mountain Ski Area - Outpost 14 reports serving 7,736 people through 25 service connections in Mono County, California.
Where does Mammoth Mountain Ski Area - Outpost 14 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 Mammoth Mountain Ski Area - Outpost 14 have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in November 2014. 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 Mammoth Mountain Ski Area - Outpost 14'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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in November 2014. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Mammoth Mountain Ski Area - Outpost 14's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Mammoth Mountain Ski Area - Outpost 14 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 Mono County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Mammoth Cwd | Mono | 8,234 | Community | Surface water |
| June Lake PUD - Down Canyon | Mono | 2,810 | Community | Surface water |
| June Lake PUD Village | Mono | 2,763 | Community | Surface water |
| Usmc/Mtn Warfare Trng Ctr - Bridgeport | Mono | 1,200 | Community | Groundwater |
| Mammoth Lakes Basin | Mono | 1,000 | Transient non-community | Groundwater |
| East Fork Campground | Mono | 750 | 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, “Mammoth Mountain Ski Area - Outpost 14, PWSID CA2600624, California”, https://aquacensus.com/water-systems/california/mammoth-mountain-ski-area-outpost-14-ca2600624 (data as of October 1, 2026).