PFAS ("forever chemicals") · 2026
Perfluoropentanoic acid in City of Cupertino, CA tap water
City of Cupertino, CA's 2026 Consumer Confidence Report tested for Perfluoropentanoic acid and reported no detectable amount.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Source water | Not detected NG/L | None set |
Verbatim from City of Cupertino, CA's 2026 Consumer Confidence Report — source document ↗
About Perfluoropentanoic acid
Perfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.'
Monitored under EPA rules; persistent in the environment.
How City of Cupertino, CA compares
5 of the 218 systems measuring Perfluoropentanoic acid on The Water Map have it at or above the federal limit:
Nearby systems also reporting Perfluoropentanoic acid:
People also ask
+Is there Perfluoropentanoic acid in City of Cupertino, CA tap water?
City of Cupertino, CA's 2026 Consumer Confidence Report tested for Perfluoropentanoic acid and found no detectable amount.
+What's the federal limit for Perfluoropentanoic acid in drinking water?
The EPA has not set an enforceable federal limit for Perfluoropentanoic acid. Utilities still report any measured levels in their annual Consumer Confidence Report.
+What is Perfluoropentanoic acid?
Perfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' Monitored under EPA rules; persistent in the environment.
+Which other U.S. cities have Perfluoropentanoic acid over the federal limit?
5 of the 218 systems on The Water Map measuring Perfluoropentanoic acid report it at or above the federal limit. Examples include City of Poquoson, VA, Hampton, VA, York County, VA.
+Where does this Perfluoropentanoic acid measurement come from?
This page reproduces the Perfluoropentanoic acid entry from the 2026 Consumer Confidence Report published by the City of Cupertino, 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/cupertino/2026/source.