Sonora, California Water Quality Report
Water quality data for 29 water systems serving 47,678 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 12.5 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 125% | Above guideline |
| PFBS | 0.003 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHxA | 0.004 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFPeA | 0.005 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
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 Sonora, California.
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Compliance & Violations
Active Violations (42)
2E
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
52
Jan 2, 1996
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Resolved Violations (263)
3D
Apr 1, 2025 — May 31, 2025
3D
Apr 1, 2025 — May 31, 2025
3D
Apr 1, 2025 — Apr 30, 2025
3D
Apr 1, 2025 — May 31, 2025
3D
Apr 1, 2025 — May 31, 2025
+ 258 more resolved violations
Frequently Asked Questions
Is Sonora tap water safe to drink?
Sonora's water meets all EPA maximum contaminant levels. However, 4 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Sonora tap water?
4 contaminants have been detected in Sonora's water supply across 29 water systems. See the full contaminant table above for details.
How can I improve my water quality in Sonora?
Install a water filter rated for the specific contaminants found in Sonora's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Sonora have any water quality violations?
Yes, Sonora currently has 42 active violations. See the violations section above for details.