Physical & aggregate · 2025
Hardness in Contra Costa Water District, CA tap water
Contra Costa Water District, CA's 2025 report shows Hardness detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Entry point | 74.6 MG/L | None set |
Highest single sample Source water | 136 MG/L | None set |
Average Source water | 81.17999999999999 MG/L | None set |
Highest single sample Entry point | 86.8 MG/L | None set |
Verbatim from Contra Costa Water District, CA's 2025 Consumer Confidence Report — source document ↗
About Hardness
A measure of dissolved calcium and magnesium minerals.
Not federally regulated for health; affects scaling, soap use, and taste.
How Contra Costa Water District, CA compares
Nearby systems also reporting Hardness:
People also ask
+Is there Hardness in Contra Costa Water District, CA tap water?
Yes — Contra Costa Water District, CA's 2025 Consumer Confidence Report lists Hardness at 81.17999999999999 MG/L. Contra Costa Water District, CA's 2025 report shows Hardness detected, but the EPA has not set an enforceable federal limit for it.
+What's the federal limit for Hardness in drinking water?
The EPA has not set an enforceable federal limit for Hardness. Utilities still report any measured levels in their annual Consumer Confidence Report.
+What is Hardness?
A measure of dissolved calcium and magnesium minerals. Not federally regulated for health; affects scaling, soap use, and taste.
+Where does this Hardness measurement come from?
This page reproduces the Hardness 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.