Radionuclides · 2024
Combined Radium in Boulder, CO tap water
Boulder, CO's 2024 Combined Radium measurement is below the federal limit of 5 pCi/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Reported level National City Well 3 | Not detected pCi/L | 5 pCi/L MCL |
Reported level SD Formation Wells 1 - 11 | 0–1.3 pCi/L | 5 pCi/L MCL |
Reported level Sweetwater Reservoir | Not detected pCi/L | 5 pCi/L MCL |
Reported level National City Well 2 | Not detected pCi/L | 5 pCi/L MCL |
Reported level National City Well 4 | Not detected pCi/L | 5 pCi/L MCL |
Reported level SD Formation Wells 1 - 11 | 0.7 pCi/L | 5 pCi/L MCL |
Reported level National City Well 2 | 0.6 pCi/L | 5 pCi/L MCL |
Reported level SD Formation Wells 1 - 11 | 0.6–1.4 pCi/L | 5 pCi/L MCL |
Reported level Lake Skinner Outlet (Aqueduct) | Not detected pCi/L | 5 pCi/L MCL |
Reported level Sweetwater Reservoir | 1 pCi/L | 5 pCi/L MCL |
Reported level National City Well 2 | 0.6 pCi/L | 5 pCi/L MCL |
Reported level SD Formation Wells 1 - 11 | 1 pCi/L | 5 pCi/L MCL |
Verbatim from Boulder, CO's 2024 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 Boulder, CO compares
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People also ask
+Is there Combined Radium in Boulder, CO tap water?
Yes — Boulder, CO's 2024 Consumer Confidence Report lists Combined Radium at 0.6–1.4 pCi/L. Boulder, CO's 2024 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.
+Where does this Combined Radium measurement come from?
This page reproduces the Combined Radium entry from the 2024 Consumer Confidence Report published by the Boulder, CO 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/co/boulder/2024/source.