PFAS ("forever chemicals") · 2025
Perfluoropentanoic acid in Golden State Water Company - Los Osos, CA tap water
Golden State Water Company - Los Osos, CA's 2025 report shows Perfluoropentanoic acid detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Source water | 2.269230769230769 NG/L | None set |
Highest single sample Source water | 5.6 NG/L | None set |
Average Entry point | 2.475 NG/L | None set |
Highest single sample Entry point | 2.5 NG/L | None set |
Verbatim from Golden State Water Company - Los Osos, CA's 2025 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 Golden State Water Company - Los Osos, 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 Golden State Water Company - Los Osos, CA tap water?
Yes — Golden State Water Company - Los Osos, CA's 2025 Consumer Confidence Report lists Perfluoropentanoic acid at 2.475 NG/L. Golden State Water Company - Los Osos, CA's 2025 report shows Perfluoropentanoic acid detected, but the EPA has not set an enforceable federal limit for it.
+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 2025 Consumer Confidence Report published by the Golden State Water Company - Los Osos, 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/golden-state-water-company-los-osos/2025/source.