Mammoth Lake, California Water Quality Report
Water quality data for 1 water system serving 23 people.
Water Source
Detected Contaminants
No contaminant data available for this location.
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Compliance & Violations
Resolved Violations (500)
3A
Jul 1, 2025 — Sep 30, 2025
3A
Apr 1, 2025 — Jun 30, 2025
3A
Oct 1, 2024 — Dec 31, 2024
3A
Jul 1, 2024 — Sep 30, 2024
3A
Jan 1, 2024 — Mar 31, 2024
+ 495 more resolved violations
Frequently Asked Questions
Is Mammoth Lake tap water safe to drink?
Mammoth Lake's water meets all EPA maximum contaminant levels. However, 0 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Mammoth Lake tap water?
0 contaminants have been detected in Mammoth Lake's water supply across 1 water system. See the full contaminant table above for details.
How can I improve my water quality in Mammoth Lake?
Install a water filter rated for the specific contaminants found in Mammoth Lake's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Mammoth Lake have any water quality violations?
Yes, Mammoth Lake currently has 3 active violations. See the violations section above for details.