Inorganic chemicals · 2025
Ammonia in Contra Costa Water District, CA tap water
Contra Costa Water District, CA's 2025 report shows Ammonia detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Source water | 0.06 MG/L | None set |
Highest single sample Entry point | 0.48 MG/L | None set |
Average Entry point | 0.13599999999999998 MG/L | None set |
Highest single sample Source water | 0.11 MG/L | None set |
Verbatim from Contra Costa Water District, CA's 2025 Consumer Confidence Report — source document ↗
How Contra Costa Water District, CA compares
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People also ask
+Is there Ammonia in Contra Costa Water District, CA tap water?
Yes — Contra Costa Water District, CA's 2025 Consumer Confidence Report lists Ammonia at 0.13599999999999998 MG/L. Contra Costa Water District, CA's 2025 report shows Ammonia detected, but the EPA has not set an enforceable federal limit for it.
+What's the federal limit for Ammonia in drinking water?
The EPA has not set an enforceable federal limit for Ammonia. Utilities still report any measured levels in their annual Consumer Confidence Report.
+Where does this Ammonia measurement come from?
This page reproduces the Ammonia 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.