Metals · 2026
Zinc in City of Hayward, CA tap water
City of Hayward, CA's 2026 Zinc measurement is below the federal limit of 5000 UG/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Source water | 3.175 UG/L | 5000 UG/L MCL |
Highest single sample Source water | 5.2 UG/L | 5000 UG/L MCL |
Verbatim from City of Hayward, CA's 2026 Consumer Confidence Report — source document ↗
About Zinc
A naturally occurring metal that can also enter water from corroding pipes.
Regulated only as a secondary (cosmetic) standard; high levels cause a metallic taste.
How City of Hayward, CA compares
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People also ask
+Is there Zinc in City of Hayward, CA tap water?
Yes — City of Hayward, CA's 2026 Consumer Confidence Report lists Zinc at 3.175 UG/L. City of Hayward, CA's 2026 Zinc measurement is below the federal limit of 5000 UG/L (MCL).
+What's the federal limit for Zinc in drinking water?
The federal MCL for Zinc is 5000 UG/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Zinc?
A naturally occurring metal that can also enter water from corroding pipes. Regulated only as a secondary (cosmetic) standard; high levels cause a metallic taste.
+Where does this Zinc measurement come from?
This page reproduces the Zinc entry from the 2026 Consumer Confidence Report published by the City of Hayward, 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/hayward/2026/source.