Inorganic chemicals · 2026
Fluoride in City of Hayward, CA tap water
City of Hayward, CA's 2026 Fluoride measurement is below the federal limit of 2 MG/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Source water | 0.27 MG/L | 2 MG/L MCL |
Average Source water | 0.19 MG/L | 2 MG/L MCL |
Verbatim from City of Hayward, CA's 2026 Consumer Confidence Report — source document ↗
About Fluoride
A mineral often added to drinking water to help prevent tooth decay.
Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.
How City of Hayward, CA compares
5 of the 404 systems measuring Fluoride on The Water Map have it at or above the federal limit:
Nearby systems also reporting Fluoride:
People also ask
+Is there Fluoride in City of Hayward, CA tap water?
Yes — City of Hayward, CA's 2026 Consumer Confidence Report lists Fluoride at 0.19 MG/L. City of Hayward, CA's 2026 Fluoride measurement is below the federal limit of 2 MG/L (MCL).
+What's the federal limit for Fluoride in drinking water?
The federal MCL for Fluoride is 2 MG/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Fluoride?
A mineral often added to drinking water to help prevent tooth decay. Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.
+Which other U.S. cities have Fluoride over the federal limit?
5 of the 404 systems on The Water Map measuring Fluoride report it at or above the federal limit. Examples include High Point, NC, Columbus, OH, Hollywood, FL.
+Where does this Fluoride measurement come from?
This page reproduces the Fluoride 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.