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7/9/2025
Sarah Thiessen
 Got water questions? Give us a call at 877-52-WATER (877-529-2837), or email us at info@watertoday.ca
Wednesday, July 9 2025 5:38 am PDT
SDWA Box
Mammoth Community Water District
Mammoth Lakes
Mono County - Mammoth Lakes is surrounded by some of the highest peaks in California. With the mountain base being 9,000 ft and the top of the mountains being 11,053 ft. Hit the slopes, try out mountain biking or swim in one of the lakes - this community has a lot to offer it's visitors.
Drinking Water Facility Profile: Mammoth Community Water District
Compliance Status: No violation identified
Owner: local government
Location: Mammoth Lakes
County: Mono County
Active Permit: CA2610001
System Type: community water system
Population Served: 8234
Watershed: Central Valley Region 6
Source: surface water
Admin Contact: Clay Murray, cmurray@mcwd.dst.ca.us
Latest Compliance Inspections: Sanitary survey, complete: June 26, 2024 (State)
No recommendations or deficiencies
The following information gathered from federal EPA pertains to the quarter ending Dec 31 2024 (data last refreshed on EPA database June 17, 2025)
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Non-compliant inspections
(of the previous 12 quarters)
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with Significant Violations
(of the previous 12 quarters)
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Informal
Enforcement Actions
(last 5 yrs)
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Formal
Enforcement Actions
(last 5 years)
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4 out of 12
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0 out of 12
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-
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1
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Violations and non-compliance
Monitoring and Reporting Violation - Stage 2 Disinfectants and Disinfection Byproducts Rule - Noted from Jan 1 2023 to December 31 2023 - resolved
*Note that drinking water information provided in this report is aggregated from the federal EPA database, state resources and local government sources where available.
EPA publishes violation and enforcement data quarterly, based on the inspection reports of the previous quarter. Water systems, states and EPA take up to three months to verify this data is accurate and complete.
Specific questions about your local water supply should be directed to the facility.
The EPA safe drinking water facilities data available to the public presents what is known to the government based upon the most recently available information for more than one million regulated facilities. EPA and states inspect a percentage of facilities each year, but many facilities, particularly smaller ones, may not have received a recent inspection. It is possible that facilities do have violations that have not yet been discovered, thus are shown as compliant in the system.
EPA cannot positively state that facilities without violations shown in ECHO are necessarily fully compliant with environmental laws. Additionally, some violations at smaller facilities do not need to be reported from the states to EPA. If ECHO shows a recent inspection and the facility is shown with no violations identified, users of the ECHO site can be more confident that the facility is in compliance with federal programs.
The compliance status of smaller facilities that have not had recent inspections or review by EPA or the states may be unknown or only available via state data systems.
See yellow tags on the front page map for boil water advisories, red for do not consume.
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