1. Seasonal and Multi-Year Variation in Radon Levels from August 2013 Sampling
It is common to misinterpret radon findings as constant or uniform over time. However, the U.S. Geological Survey sampled radon-222 in Box Elder County's aquifer 100VLFL during a week in August 2013 and found a range of values between 290.0 and 1090.0 pCi/L. This variation reflects natural fluctuations and different well conditions over a short period, showing radon is not a static presence in groundwater.
2. Plumbing Material and Age Are Independent of Source Water Radon Levels
While plumbing age and materials affect water quality in other respects, they do not influence radon concentration in the source water. Radon enters your water at or below the source and is unrelated to the pipes or fixtures delivering water to the household. Any radon detected is from the groundwater itself, not introduced by internal plumbing.
3. Sample Depth and Well Characteristics Affect Expected Radon Concentrations
Groundwater samples were taken from wells 422 to 515 feet deep. Radon levels can vary by depth because of geological factors such as uranium content in surrounding rock formations. Homeowners with shallower or deeper wells may see different radon behavior in their own water, underscoring the need for specific testing of their well water to determine actual radon levels.
4. Origin of Radon in Groundwater of Box Elder County
Radon-222 is a naturally occurring radioactive gas formed from uranium decay in soil and rock. It dissolves into groundwater as it moves through underground geology in Box Elder County’s aquifer 100VLFL. This process is well-documented and explains why radon can be detected in all sampled wells in the area, although its concentration varies.
5. Using the Median and Range to Understand What is Likely at Your Tap
The USGS reported a median radon level of 750.0 pCi/L with a range from 290.0 to 1090.0 pCi/L across three wells. As a homeowner, you can view the median as a typical concentration found during the sampling week, while the range shows the variability. These values are not a direct indicator of your household’s water radon level but provide a regional context for possible exposure.
6. Adjustments for Large Households or Seasonal Properties
Water use patterns impact how radon exposure may accumulate in a household. Larger families or properties with fluctuating occupancy, such as seasonal homes, may experience differences in radon concentration at the tap due to water usage rates and holding times. This factor is separate from the groundwater radon levels and should be part of your overall water quality management plan.
Government sampling in Box Elder County, UT, covered multiple wells in the aquifer 100VLFL and found radon in all samples with no federal limit exceeded. For precise knowledge of your water, individual testing is essential. When treatment is desired, the C-Series Radon in Water Filter ships ready to configure and can address radon in well water, providing a documented way to reduce radon at the tap. For full data and additional details, consult the U.S. Geological Survey’s groundwater information at their monitoring site.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2013-08-20. 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 Radon-222 in the 100VLFL aquifer (Box Elder County): 3 results from 3 wells, median 750.0 pCi/L, range 290.0-1090.0 pCi/L; none above any federal threshold