Metals · 2026
Boron in San Diego, City of, CA tap water
San Diego, City of, CA's 2026 report shows Boron detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Entry point | 95.33333333333333 UG/L | None set |
Highest single sample Source water | 170 UG/L | None set |
Average Source water | 116.8 UG/L | None set |
Average Other | 97.33333333333333 UG/L | None set |
Highest single sample Other | 125 UG/L | None set |
Highest single sample Entry point | 124 UG/L | None set |
Verbatim from San Diego, City of, CA's 2026 Consumer Confidence Report — source document ↗
About Boron
A naturally occurring element from rock and soil.
No enforceable federal limit; the EPA has issued a health advisory level.
How San Diego, City of, CA compares
5 of the 129 systems measuring Boron on The Water Map have it at or above the federal limit:
Nearby systems also reporting Boron:
People also ask
+Is there Boron in San Diego, City of, CA tap water?
Yes — San Diego, City of, CA's 2026 Consumer Confidence Report lists Boron at 116.8 UG/L. San Diego, City of, CA's 2026 report shows Boron detected, but the EPA has not set an enforceable federal limit for it.
+What's the federal limit for Boron in drinking water?
The EPA has not set an enforceable federal limit for Boron. Utilities still report any measured levels in their annual Consumer Confidence Report.
+What is Boron?
A naturally occurring element from rock and soil. No enforceable federal limit; the EPA has issued a health advisory level.
+Which other U.S. cities have Boron over the federal limit?
5 of the 129 systems on The Water Map measuring Boron report it at or above the federal limit. Examples include Inglewood, CA, Pomona - City, Water Dept., CA, West Covina, CA.
+Where does this Boron measurement come from?
This page reproduces the Boron entry from the 2026 Consumer Confidence Report published by the San Diego, City of, CA water utility — the annual drinking-water report every U.S. utility is required by federal law to publish. The original source document is archived at /water/ca/san-diego/2026/source.