Radionuclides · 2025
Combined Radium in Golden State Water Company - Los Osos, CA tap water
Golden State Water Company - Los Osos, CA's 2025 Combined Radium measurement is below the federal limit of 5 PCI/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Source water | 0.32616666666666666 PCI/L | 5 PCI/L MCL |
Highest single sample Source water | 0.862 PCI/L | 5 PCI/L MCL |
Verbatim from Golden State Water Company - Los Osos, CA's 2025 Consumer Confidence Report — source document ↗
About Combined Radium
Combined radium-226 and radium-228 — naturally occurring radioactive elements.
Long-term exposure above the federal limit increases the risk of bone cancer.
How Golden State Water Company - Los Osos, CA compares
5 of the 252 systems measuring Combined Radium on The Water Map have it at or above the federal limit:
Nearby systems also reporting Combined Radium:
People also ask
+Is there Combined Radium in Golden State Water Company - Los Osos, CA tap water?
Yes — Golden State Water Company - Los Osos, CA's 2025 Consumer Confidence Report lists Combined Radium at 0.32616666666666666 PCI/L. Golden State Water Company - Los Osos, CA's 2025 Combined Radium measurement is below the federal limit of 5 PCI/L (MCL).
+What's the federal limit for Combined Radium in drinking water?
The federal MCL for Combined Radium is 5 PCI/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Combined Radium?
Combined radium-226 and radium-228 — naturally occurring radioactive elements. Long-term exposure above the federal limit increases the risk of bone cancer.
+Which other U.S. cities have Combined Radium over the federal limit?
5 of the 252 systems on The Water Map measuring Combined Radium report it at or above the federal limit. Examples include West Covina, CA, Albuquerque, NM, City of Baltimore, MD.
+Where does this Combined Radium measurement come from?
This page reproduces the Combined Radium entry from the 2025 Consumer Confidence Report published by the Golden State Water Company - Los Osos, 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/golden-state-water-company-los-osos/2025/source.