Upper Lake, California Water Quality Report
Water quality data for 4 water systems serving 1,139 people.
Water Source
Detected Contaminants
No contaminant data available for this location.
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Compliance & Violations
Active Violations (3)
4H
Jul 2, 2025
4G
Oct 17, 2024
2E
Oct 17, 2024
Resolved Violations (51)
03
Jan 1, 2019 — Dec 31, 2019
03
Jan 1, 2019 — Dec 31, 2019
03
Jan 1, 2015 — Dec 31, 2015
03
Jan 1, 2015 — Dec 31, 2015
52
Jul 1, 2008
+ 46 more resolved violations
Frequently Asked Questions
Is Upper Lake tap water safe to drink?
Upper 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 Upper Lake tap water?
0 contaminants have been detected in Upper Lake's water supply across 4 water systems. See the full contaminant table above for details.
How can I improve my water quality in Upper Lake?
Install a water filter rated for the specific contaminants found in Upper 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 Upper Lake have any water quality violations?
Yes, Upper Lake currently has 3 active violations. See the violations section above for details.