The U.S. Geological Survey has sampled groundwater from wells in Grant County's aquifer 112GLCV, collecting 26 uranium measurements from 12 wells between 2010 and 2023. Concentrations varied from 1.31 to 31.4 micrograms per liter, with a median of 5.45 micrograms per liter. None of these samples exceeded federal uranium thresholds.
Uranium Levels Change Over Time But Stay Within Observed Bounds
The sampling record spans over a decade, demonstrating variability in uranium presence across many wells at depths from 21 to 112 feet. While concentrations fluctuate, all detected values remain under established federal uranium limits for drinking water. This suggests the uranium content in groundwater here varies seasonally or across years but does not surpass safety thresholds in these measurements.
Water at the Tap with the Fleck Uranium & Radium System
When household water passes through the Fleck Uranium & Radium System—a system designed to address uranium and radium presence up to a grain capacity of 32,000—the treated water has uranium and radium levels reduced below detection or relevant concern levels. This system ships ready to configure to residential water lines and removes uranium and radium through ion exchange processes, improving water quality where these elements are present.
Aesthetic Secondary Standards Versus Health-Based Limits for Uranium
Uranium also has aesthetic secondary standards that address taste, staining, and corrosivity in water. These differ significantly from health-based limits. The federal guidelines that uranium sampling references focus on health impact thresholds, not taste or staining. The measurements from Grant County wells fall well below health-based limits, despite natural variability, indicating no health-based exceedances reported.
Fixtures and Appliances Most Affected by Uranium-Radium Presence
Uranium and radium in water primarily affect fixtures and appliances through potential staining or mineral buildup, but more importantly relate to long-term health concerns. Appliances that use large volumes of water, such as water heaters and coffee makers, may accumulate mineral deposits over time. Treatment to reduce these elements helps protect household plumbing and appliances from mineral-related issues and reduces exposure.
Long-Term Effects When Uranium-Radium Remains Untreated
Leaving uranium and radium in water untreated over many years can potentially increase exposure to these naturally occurring radioelements. While the Grant County sampling record shows no samples above federal limits, individual well testing is needed to confirm actual household concentrations. Continual exposure to elevated uranium or radium may affect kidney function or increase radiological risks, underscoring the importance of testing and potential treatment where indicated.
Understanding Certified Laboratory Reports on Uranium-Radium
Certified tests from laboratories report uranium concentrations in micrograms per liter (ug/L) alongside detection limits and reference standards. These reports clarify whether uranium is detected and how measured levels compare to federal guidelines. Because regional sampling shows variable but below-limit concentrations, interpreting individual water test results in this context is essential to understand specific household exposure and treatment needs.
The data discussed comes from U.S. Geological Survey groundwater sampling in Grant County's aquifer 112GLCV, representing wells sampled between 2010 and 2023. The full record and details are available at the government source for ongoing reference.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2023-09-28. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.
On record: U.S. Geological Survey sampling of Uranium in the 112GLCV aquifer (Grant County): 26 results from 12 wells, median 5.45 ug/L, range 1.31-31.4 ug/L; none above any federal threshold
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