Radionuclides · 2025
Gross Alpha in Rancho Estates Mutual Water Co., CA tap water
Rancho Estates Mutual Water Co., CA's 2025 Consumer Confidence Report shows Gross Alpha at or above the federal limit (15 PCI/L MCL). Measured value is 1.2× the threshold.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Source water | 18.4 PCI/L | 15 PCI/L MCL |
Average Source water | 18.4 PCI/L | 15 PCI/L MCL |
Verbatim from Rancho Estates Mutual Water Co., CA'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.
How Rancho Estates Mutual Water Co., CA compares
5 of the 246 systems measuring Gross Alpha on The Water Map have it at or above the federal limit:
Nearby systems also reporting Gross Alpha:
People also ask
+Is there Gross Alpha in Rancho Estates Mutual Water Co., CA tap water?
Yes — Rancho Estates Mutual Water Co., CA's 2025 Consumer Confidence Report lists Gross Alpha at 18.4 PCI/L. Rancho Estates Mutual Water Co., CA's 2025 Consumer Confidence Report shows Gross Alpha at or above the federal limit (15 PCI/L MCL). Measured value is 1.2× the threshold.
+What's the federal limit for Gross Alpha in drinking water?
The federal MCL for Gross Alpha is 15 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?
5 of the 246 systems on The Water Map measuring Gross Alpha report it at or above the federal limit. Examples include San Diego, City of, CA, Birmingham, AL, Saticoy Country Club-city of Ventura, CA.
+Where does this Gross Alpha measurement come from?
This page reproduces the Gross Alpha entry from the 2025 Consumer Confidence Report published by the Rancho Estates Mutual Water Co., 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/rancho-estates-mutual-water-co/2025/source.