Metals · 2026
Magnesium in Rialto, City of, CA tap water
Rialto, City of, CA's 2026 report shows Magnesium detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Source water | 11 MG/L | None set |
Average Source water | 7.9 MG/L | None set |
Verbatim from Rialto, City of, CA's 2026 Consumer Confidence Report — source document ↗
About Magnesium
A naturally occurring mineral that contributes to water hardness.
Not federally regulated for health; affects scaling and taste.
How Rialto, City of, CA compares
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People also ask
+Is there Magnesium in Rialto, City of, CA tap water?
Yes — Rialto, City of, CA's 2026 Consumer Confidence Report lists Magnesium at 7.9 MG/L. Rialto, City of, CA's 2026 report shows Magnesium detected, but the EPA has not set an enforceable federal limit for it.
+What's the federal limit for Magnesium in drinking water?
The EPA has not set an enforceable federal limit for Magnesium. Utilities still report any measured levels in their annual Consumer Confidence Report.
+What is Magnesium?
A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
+Where does this Magnesium measurement come from?
This page reproduces the Magnesium 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.