Metals · 2024
Barium in Ontario, CA tap water
Ontario, CA's 2024 Consumer Confidence Report shows Barium at or above the federal limit (1 ug/L MCL). Measured value is 80.0× the threshold.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Reported level Purchased Groundwater JCSD (870 Zone) | 80 ug/L | 1 ug/L MCL |
Reported level Purchased Groundwater CDA 2 (1110 Zone) | 73 ug/L | 1 ug/L MCL |
Reported level Purchased Groundwater CDA 1 (870 Zone) | 42 ug/L | 1 ug/L MCL |
Verbatim from Ontario, CA's 2024 Consumer Confidence Report — source document ↗
About Barium
A metal from erosion of natural deposits and industrial discharge.
Long-term exposure above the federal limit can raise blood pressure.
How Ontario, CA compares
5 of the 286 systems measuring Barium on The Water Map have it at or above the federal limit:
Nearby systems also reporting Barium:
People also ask
+Is there Barium in Ontario, CA tap water?
Yes — Ontario, CA's 2024 Consumer Confidence Report lists Barium at 80 ug/L. Ontario, CA's 2024 Consumer Confidence Report shows Barium at or above the federal limit (1 ug/L MCL). Measured value is 80.0× the threshold.
+What's the federal limit for Barium in drinking water?
The federal MCL for Barium is 1 ug/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Barium?
A metal from erosion of natural deposits and industrial discharge. Long-term exposure above the federal limit can raise blood pressure.
+Which other U.S. cities have Barium over the federal limit?
5 of the 286 systems on The Water Map measuring Barium report it at or above the federal limit. Examples include Columbus, OH, Hollywood, FL, Mcallen, TX.
+Where does this Barium measurement come from?
This page reproduces the Barium 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.