Inorganic chemicals · 2025
Fluoride in Contra Costa Water District, CA tap water
Contra Costa Water District, CA's 2025 Fluoride measurement is below the federal limit of 2 MG/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Source water | 0.074 MG/L | 2 MG/L MCL |
Average Entry point | 0.17600000000000002 MG/L | 2 MG/L MCL |
Highest single sample Entry point | 0.68 MG/L | 2 MG/L MCL |
Highest single sample Source water | 0.17 MG/L | 2 MG/L MCL |
Verbatim from Contra Costa Water District, CA's 2025 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 Contra Costa Water District, 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 Contra Costa Water District, CA tap water?
Yes — Contra Costa Water District, CA's 2025 Consumer Confidence Report lists Fluoride at 0.17600000000000002 MG/L. Contra Costa Water District, CA's 2025 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 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.