Physical & aggregate · 2026
Hardness in Rialto, City of, CA tap water
Rialto, City of, CA's 2026 report shows Hardness detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Source water | 220 MG/L | None set |
Average Source water | 162 MG/L | None set |
Verbatim from Rialto, City of, CA's 2026 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 Rialto, City of, CA compares
Nearby systems also reporting Hardness:
People also ask
+Is there Hardness in Rialto, City of, CA tap water?
Yes — Rialto, City of, CA's 2026 Consumer Confidence Report lists Hardness at 162 MG/L. Rialto, City of, CA's 2026 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 2026 Consumer Confidence Report published by the Rialto, City of, 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/rialto/2026/source.