Government sampling of groundwater wells in Johnson County's aquifer 111ALVM reports uranium-radium (Radium-226) at a median level of 0.4 pCi/L with a range from 0.11 to 1.14 pCi/L. These measurements come from four wells sampled between June and August 2017, at depths of 17 to 177 feet. None of these data points exceeded federal standards.
How Uranium and Radium Enter Groundwater in Johnson County
Radium-226 is a naturally occurring radioactive element found in some soils and rock formations. In Johnson County’s aquifer 111ALVM, radium can dissolve from minerals underground into groundwater over time. Its presence depends on the geological makeup and the interaction between water and the surrounding environment. This natural process affects samples across multiple wells in the area, but the specific level in any home’s well requires individual testing.
Misunderstanding Uranium-Radium as the Same Problem as Other Radioactive Elements
Residents often confuse uranium-radium presence with other radioactive contaminants such as radon gas or uranium isotopes. While these substances can coexist, radium-226 has distinct chemical and physical properties and behaves differently in water systems. The data reported for Johnson County specifically measures radium-226, not uranium or radon, which helps clarify what treatment technology targets.
The Sample Size and What It Means for Interpreting the Data
The Johnson County record is based on four wells sampled over a three-month period. Although these samples provide a regional snapshot of radium-226 levels in the aquifer, a small sample size means they can't represent every residential well conclusively. Individual well testing is essential to confirm local water quality and determine whether treatment is needed.
Assessing Treatment Capacity Against Household Water Demand
When considering uranium-radium water treatment options, matching the system capacity to household water use is critical. The Pentair Uranium & Radium System, for example, has a grain capacity of 32,000, suitable for typical residential consumption levels. Estimating your daily water demand helps ensure that any equipment you choose will handle your household’s needs without frequent regeneration or replacement.
What Changes for Larger, Seasonal, or Multiple-Use Properties
For homes with higher occupancy or seasonal use, water demand patterns shift. Larger households consume more water daily, which may require greater treatment capacity or more frequent system servicing. Second homes or seasonal properties might experience longer periods of non-use, affecting system performance and maintenance scheduling. These factors should be considered alongside local water data when choosing treatment solutions.
Selecting a water treatment system like the Pentair Uranium & Radium System that ships ready to configure can provide a tailored approach based on your specific demand and local groundwater characteristics documented by government sampling. Testing your water and evaluating your household’s usage allow for an informed choice that aligns treatment capacity with your needs.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2017-08-28. 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 Radium-226 in the 111ALVM aquifer (Johnson County): 4 results from 4 wells, median 0.4 pCi/L, range 0.11-1.14 pCi/L; none above any federal threshold