Metals · 2024
Silica in Castro Valley, CA tap water
Castro Valley, CA's 2024 report shows Silica detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Reported level USL | 9–12 mg/L | None set |
Reported level Lafayette | 8–11 mg/L | None set |
Reported level Walnut Creek | 8–11 mg/L | None set |
Reported level Orinda | 8–11 mg/L | None set |
Reported level Sobrante | 10–12 mg/L | None set |
Verbatim from Castro Valley, CA's 2024 Consumer Confidence Report — source document ↗
About Silica
A naturally occurring compound from sand and rock.
Not federally regulated for health; relevant mainly for industrial water use.
How Castro Valley, CA compares
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People also ask
+Is there Silica in Castro Valley, CA tap water?
Yes — Castro Valley, CA's 2024 Consumer Confidence Report lists Silica at 9–12 mg/L. Castro Valley, CA's 2024 report shows Silica detected, but the EPA has not set an enforceable federal limit for it.
+What's the federal limit for Silica in drinking water?
The EPA has not set an enforceable federal limit for Silica. Utilities still report any measured levels in their annual Consumer Confidence Report.
+What is Silica?
A naturally occurring compound from sand and rock. Not federally regulated for health; relevant mainly for industrial water use.
+Where does this Silica measurement come from?
This page reproduces the Silica entry from the 2024 Consumer Confidence Report published by the Castro Valley, 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/castro-valley/2024/source.