Yes — Naperville, IL's 2024 Consumer Confidence Report lists Gross Alpha at 3.1 pCi/L. Naperville, IL's 2024 report shows Gross Alpha detected, but the EPA has not set an enforceable federal limit for it.

+What's the federal limit for Gross Alpha in drinking water?

The federal MCLG for Gross Alpha is 0 pCi/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.

+What is Gross Alpha?

Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances. Long-term exposure above the federal limit increases cancer risk.

+Which other U.S. cities have Gross Alpha over the federal limit?

4 of the 186 systems on The Water Map measuring Gross Alpha report it at or above the federal limit. Examples include Pomona, CA, Birmingham, AL, Burbank, CA.

+Where does this Gross Alpha measurement come from?

This page reproduces the Gross Alpha entry from the 2024 Consumer Confidence Report published by the Naperville, IL 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/il/naperville/2024/source.

Full report

All Naperville, IL water-quality data →

Every contaminant measured in the 2024 report.

Contaminant pillar

Gross Alpha across the U.S. →

Every public water system measuring Gross Alpha, ranked.