Radionuclides · 2025
Gross Alpha in Rochester, MN tap water
Rochester, MN's 2025 Gross Alpha level is between 80% and 100% of the federal limit (0 pCi/L MCLG) — measured but not in violation.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Maximum Average or Highest Single Test Result | 14 pCi/L | 0 pCi/L MCLG |
Range of Detected Test Results | 4.3–14 pCi/L | 0 pCi/L MCLG |
Verbatim from Rochester, MN's 2025 Consumer Confidence Report — source document ↗
About Gross Alpha
Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances.
Long-term exposure above the federal limit increases cancer risk.
People also ask
+Is there Gross Alpha in Rochester, MN tap water?
Yes — Rochester, MN's 2025 Consumer Confidence Report lists Gross Alpha at 14 pCi/L. Rochester, MN's 2025 Gross Alpha level is between 80% and 100% of the federal limit (0 pCi/L MCLG) — measured but not in violation.
+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.
+Where does this Gross Alpha measurement come from?
This page reproduces the Gross Alpha entry from the 2025 Consumer Confidence Report published by the Rochester, MN 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/mn/rochester/2025/source.