Metals · 2024
Calcium in Ontario, CA tap water
Ontario, CA's 2024 report shows Calcium detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Reported level Local Groundwater | 39 mg/L | None set |
Reported level Purchased Groundwater JCSD (870 Zone) | 65 mg/L | None set |
Reported level Purchased Groundwater CDA 2 (1110 Zone) | 44 mg/L | None set |
Reported level Imported Water (WFA w/ SAWCO) | 32 mg/L | None set |
Reported level Purchased Groundwater CDA 1 (870 Zone) | 44 mg/L | None set |
Verbatim from Ontario, CA's 2024 Consumer Confidence Report — source document ↗
About Calcium
A naturally occurring mineral that contributes to water hardness.
Not federally regulated for health; affects scaling and taste.
How Ontario, CA compares
3 of the 117 systems measuring Calcium on The Water Map have it at or above the federal limit:
Nearby systems also reporting Calcium:
People also ask
+Is there Calcium in Ontario, CA tap water?
Yes — Ontario, CA's 2024 Consumer Confidence Report lists Calcium at 65 mg/L. Ontario, CA's 2024 report shows Calcium detected, but the EPA has not set an enforceable federal limit for it.
+What's the federal limit for Calcium in drinking water?
The EPA has not set an enforceable federal limit for Calcium. Utilities still report any measured levels in their annual Consumer Confidence Report.
+What is Calcium?
A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
+Which other U.S. cities have Calcium over the federal limit?
3 of the 117 systems on The Water Map measuring Calcium report it at or above the federal limit. Examples include Pomona, CA, Burbank, CA, Vancouver, WA.
+Where does this Calcium measurement come from?
This page reproduces the Calcium entry from the 2024 Consumer Confidence Report published by the Ontario, 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/ontario/2024/source.