Sonoma, California Water Quality Report
Water quality data for 5 water systems serving 13,206 people.
Water Source
Detected Contaminants
Recommended Water Filters
Based on the contaminants detected in your water supply, these filtration systems are recommended:
Reverse Osmosis (RO)
Reverse osmosis systems remove up to 99% of PFAS compounds. Recommended for homes with detected PFAS.
Up to 99% PFAS removal
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Connect with a certified water treatment professional in Sonoma, California.
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Compliance & Violations
Active Violations (3)
4H
Jul 2, 2025
2E
Oct 17, 2024
4G
Oct 17, 2024
Resolved Violations (52)
3A
May 1, 2021 — May 31, 2021
3A
May 1, 2021 — May 31, 2021
03
Apr 1, 2021 — Jun 30, 2021
03
Apr 1, 2021 — Jun 30, 2021
30
Jan 1, 2020 — Dec 31, 2020
+ 47 more resolved violations
Frequently Asked Questions
Is Sonoma tap water safe to drink?
Sonoma's water has 1 contaminant detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Sonoma tap water?
3 contaminants have been detected in Sonoma's water supply across 5 water systems. See the full contaminant table above for details.
How can I improve my water quality in Sonoma?
Install a water filter rated for the specific contaminants found in Sonoma's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Sonoma have any water quality violations?
Yes, Sonoma currently has 3 active violations. See the violations section above for details.