PFAS ("forever chemicals") · 2026
Perfluoroheptanoic acid in Ontario Municipal Utilities Company, CA tap water
Ontario Municipal Utilities Company, CA's 2026 report shows Perfluoroheptanoic acid detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Source water | 1.2833333333333334 NG/L | None set |
Highest single sample Source water | 2.7 NG/L | None set |
Verbatim from Ontario Municipal Utilities Company, CA's 2026 Consumer Confidence Report — source document ↗
About Perfluoroheptanoic acid
Perfluoroheptanoic acid, a PFAS 'forever chemical.'
Monitored under EPA rules; persistent in the environment.
How Ontario Municipal Utilities Company, CA compares
1 of the 184 systems measuring Perfluoroheptanoic acid on The Water Map have it at or above the federal limit:
Nearby systems also reporting Perfluoroheptanoic acid:
People also ask
+Is there Perfluoroheptanoic acid in Ontario Municipal Utilities Company, CA tap water?
Yes — Ontario Municipal Utilities Company, CA's 2026 Consumer Confidence Report lists Perfluoroheptanoic acid at 1.2833333333333334 NG/L. Ontario Municipal Utilities Company, CA's 2026 report shows Perfluoroheptanoic acid detected, but the EPA has not set an enforceable federal limit for it.
+What's the federal limit for Perfluoroheptanoic acid in drinking water?
The EPA has not set an enforceable federal limit for Perfluoroheptanoic acid. Utilities still report any measured levels in their annual Consumer Confidence Report.
+What is Perfluoroheptanoic acid?
Perfluoroheptanoic acid, a PFAS 'forever chemical.' Monitored under EPA rules; persistent in the environment.
+Which other U.S. cities have Perfluoroheptanoic acid over the federal limit?
1 of the 184 systems on The Water Map measuring Perfluoroheptanoic acid report it at or above the federal limit. Examples include Boonsboro Keedysville, MD.
+Where does this Perfluoroheptanoic acid measurement come from?
This page reproduces the Perfluoroheptanoic acid entry from the 2026 Consumer Confidence Report published by the Ontario Municipal Utilities Company, 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/ontario-municipal-utilities-company/2026/source.