Radionuclides · 2024
Uranium in Ontario, CA tap water
Ontario, CA's 2024 Uranium measurement is below the federal limit of 20 pCi/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Reported level Purchased Groundwater JCSD (870 Zone) | 0.63 pCi/L | 20 pCi/L MCL |
Verbatim from Ontario, CA's 2024 Consumer Confidence Report — source document ↗
About Uranium
A naturally occurring radioactive metal from erosion of natural deposits.
Long-term exposure above the federal limit can damage the kidneys and increase cancer risk.
How Ontario, CA compares
3 of the 97 systems measuring Uranium on The Water Map have it at or above the federal limit:
Nearby systems also reporting Uranium:
People also ask
+Is there Uranium in Ontario, CA tap water?
Yes — Ontario, CA's 2024 Consumer Confidence Report lists Uranium at 0.63 pCi/L. Ontario, CA's 2024 Uranium measurement is below the federal limit of 20 pCi/L (MCL).
+What's the federal limit for Uranium in drinking water?
The federal MCL for Uranium is 20 pCi/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Uranium?
A naturally occurring radioactive metal from erosion of natural deposits. Long-term exposure above the federal limit can damage the kidneys and increase cancer risk.
+Which other U.S. cities have Uranium over the federal limit?
3 of the 97 systems on The Water Map measuring Uranium report it at or above the federal limit. Examples include Pomona, CA, Glendale, CA, Albuquerque, NM.
+Where does this Uranium measurement come from?
This page reproduces the Uranium 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.