Disinfection byproducts · 2025
Chloroform in Contra Costa Water District, CA tap water
Contra Costa Water District, CA's 2025 report shows Chloroform detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Entry point | 7.933333333333334 UG/L | None set |
Average Distribution | 8.525 UG/L | None set |
Highest single sample Distribution | 17 UG/L | None set |
Highest single sample Entry point | 9.4 UG/L | None set |
Verbatim from Contra Costa Water District, CA's 2025 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 Contra Costa Water District, CA compares
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People also ask
+Is there Chloroform in Contra Costa Water District, CA tap water?
Yes — Contra Costa Water District, CA's 2025 Consumer Confidence Report lists Chloroform at 8.525 UG/L. Contra Costa Water District, CA's 2025 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 2025 Consumer Confidence Report published by the Contra Costa Water District, 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/contra-costa-water-district/2025/source.