Disinfection byproducts · 2026
Chloroform in California Water Service - San Mateo, CA tap water
California Water Service - San Mateo, CA's 2026 report shows Chloroform detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Distribution | 25 UG/L | None set |
Average Distribution | 19.142857142857142 UG/L | None set |
Verbatim from California Water Service - San Mateo, CA's 2026 Consumer Confidence Report — source document ↗
About Chloroform
A trihalomethane formed when chlorine reacts with organic matter in water.
A component of regulated total trihalomethanes; long-term exposure is linked to liver and kidney effects.
How California Water Service - San Mateo, CA compares
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People also ask
+Is there Chloroform in California Water Service - San Mateo, CA tap water?
Yes — California Water Service - San Mateo, CA's 2026 Consumer Confidence Report lists Chloroform at 19.142857142857142 UG/L. California Water Service - San Mateo, CA's 2026 report shows Chloroform detected, but the EPA has not set an enforceable federal limit for it.
+What's the federal limit for Chloroform in drinking water?
The EPA has not set an enforceable federal limit for Chloroform. Utilities still report any measured levels in their annual Consumer Confidence Report.
+What is Chloroform?
A trihalomethane formed when chlorine reacts with organic matter in water. A component of regulated total trihalomethanes; long-term exposure is linked to liver and kidney effects.
+Where does this Chloroform measurement come from?
This page reproduces the Chloroform entry from the 2026 Consumer Confidence Report published by the California Water Service - San Mateo, 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/california-water-service-san-mateo/2026/source.