San Diego, California Water Quality Report
Water quality data for 16 water systems serving 1,424,026 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 65.0 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 650% | Above guideline |
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Compliance & Violations
Active Violations (13)
71
Jul 1, 2025
66
Jan 1, 2025
4G
Oct 17, 2024
2E
Oct 17, 2024
52
Oct 1, 2024
52
Oct 1, 2024
52
Oct 1, 2024
66
Dec 30, 2022
52
Jan 1, 2019
75
Oct 4, 2018
75
Apr 1, 2018
52
Jun 30, 2007
71
Jul 1, 2005
Resolved Violations (487)
3A
Sep 1, 2025 — Sep 30, 2025
19
Sep 1, 2025 — Sep 30, 2025
19
Jul 1, 2025 — Jul 31, 2025
19
Mar 1, 2025 — Mar 31, 2025
3A
Mar 1, 2025 — Mar 31, 2025
+ 482 more resolved violations
Frequently Asked Questions
Is San Diego tap water safe to drink?
San Diego's water meets all EPA maximum contaminant levels. However, 1 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in San Diego tap water?
1 contaminants have been detected in San Diego's water supply across 16 water systems. See the full contaminant table above for details.
How can I improve my water quality in San Diego?
Install a water filter rated for the specific contaminants found in San Diego's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does San Diego have any water quality violations?
Yes, San Diego currently has 77 active violations. See the violations section above for details.