What's in San Diego, City of, CA tap water

The 2025 Consumer Confidence Report for the San Diego, City of, CA water utility lists 2 contaminants at or above the federal limit: Gross Alpha and Uranium. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.

131 contaminants were measured in San Diego, City of, CA's 2025 Consumer Confidence Report, spanning other, metals, and pfas ("forever chemicals"). 85 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.

2 contaminants in San Diego, City of, CA's 2025 report sit at or above the federal limit: Gross Alpha (4.5× the limit); Uranium (3.3× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.

The contaminant with the highest measured value relative to its federal limit in the 2025 report is Gross Alpha, at 4.5× the federal threshold. It belongs to the radionuclides family of contaminants.

One contaminant is between 80% and 100% of the federal limit in this report: Odor. Approaching means measured but not in violation — a margin that can close quickly if conditions change.

Every value is transcribed from San Diego, City of, CA's 2025 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.

Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2025 report; a new report will replace it once the utility publishes its next annual update.