Physical & aggregate · 2025
Hardness in Santa Rosa, City of, CA tap water
Santa Rosa, City of, 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 Source water | 123.03333333333335 MG/L | None set |
Highest single sample Source water | 140 MG/L | None set |
Verbatim from Santa Rosa, City of, 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 Santa Rosa, City of, CA compares
Nearby systems also reporting Hardness:
People also ask
+Is there Hardness in Santa Rosa, City of, CA tap water?
Yes — Santa Rosa, City of, CA's 2025 Consumer Confidence Report lists Hardness at 123.03333333333335 MG/L. Santa Rosa, City of, 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 Santa Rosa, 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/santa-rosa/2025/source.