Radionuclides
Gross Beta Particle Activity in U.S. tap water
360 public water systems across 18 U.S. states report Gross Beta Particle Activity in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
What it is
Gross beta particle activity — a combined measure of beta-emitting radioactive substances.
Why it's regulated
Long-term exposure above the federal screening level increases cancer risk.
Within the federal limit (20)
Frequently asked
+What is Gross Beta Particle Activity?
Gross beta particle activity — a combined measure of beta-emitting radioactive substances. Long-term exposure above the federal screening level increases cancer risk.
+What is the federal limit for Gross Beta Particle Activity in drinking water?
The federal MCLG for Gross Beta Particle Activity is 0 . The EPA enforces this against the regulated reporting statistic (typically a running annual average or 90th percentile), not a single-sample spike.
+How many U.S. water systems have Gross Beta Particle Activity over the federal limit?
Zero of the 360 public water systems in The Water Map dataset currently report Gross Beta Particle Activity at or above its federal limit.
+How can I check if Gross Beta Particle Activity is in my city's tap water?
Search your city on The Water Map (https://www.thewatermap.com/) or browse the list on this page. Every U.S. public water utility is required to publish an annual Consumer Confidence Report that lists every contaminant it measured, including Gross Beta Particle Activity.
See Gross Beta Particle Activity on the map
Color-coded by status across the whole country.
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