Government groundwater sampling in Chesterfield County's aquifer 211MDDF found Radon-222 present in all sampled wells, with concentrations ranging from 64.0 to 320.0 pCi/L and a median of 189.5 pCi/L based on 12 samples from 11 wells collected between 2011 and 2012. None of these results exceeded any federal threshold.
Myth: Radon levels vary little between year-round homes and seasonal properties
The sampling record covers wells 185 to 458 feet deep but does not differentiate by household type. In larger households or those occupied only seasonally, water use patterns affect radon exposure. For example, stagnant water during long absences may alter radon release when water is next used. Understanding your household’s water use habits helps gauge potential changes in radon behavior, but the government data itself does not specify these differences.
Myth: Detected, median, and range values mean the same thing about radon risk
In this context, “detected” means radon was measurable in every sample taken; it does not imply any health or safety issue. The median value of 189.5 pCi/L is the middle point of all samples and gives a central tendency but does not represent your well’s specific concentration. The range between 64.0 and 320.0 pCi/L shows variability among wells in the area. Only testing your specific water source can determine your individual radon level.
Myth: Radon impacts all water fixtures and appliances equally
Radon presence primarily affects faucets and showers where water is aerated or released into air, because radon gas can escape from water into indoor air. Appliances that heat water, such as water heaters, can also contribute to indoor radon levels by releasing gas. Fixtures with low agitation or closed water use generally see less radon release. Understanding which fixtures first show radon effects can guide where to focus treatment or monitoring efforts.
Myth: Untreated radon in water leads to immediate health hazards
While radon is radioactive and can pose health risks through prolonged exposure to its gas emanating from water, the government samples in this area show no exceedance of federal thresholds. Untreated radon in water contributes only a portion of total household radon exposure, and effects accumulate over long periods rather than instantly. Monitoring and testing are necessary to understand risks specifically for your property.
Myth: A certified radon lab test report is difficult to interpret
A certified laboratory test for radon in water reports your sample’s radon concentration in picocuries per liter (pCi/L). The report typically includes reference values such as federal standards but does not classify results as simply safe or unsafe. Understanding the numbers requires comparing your test result with local government data and federal guidelines to decide on appropriate action.
This overview reflects the U.S. Geological Survey groundwater sampling results for Chesterfield County aquifer 211MDDF. For full details and ongoing monitoring updates, consult the USGS data portal referenced here.
When your household water tests indicate radon presence, the Fleck Radon in Water Filter provides a documented method to reduce radon exposure by treating water before it reaches taps and appliances. The system ships ready to configure for home use.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2012-02-09. 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 211MDDF aquifer (Chesterfield County): 12 results from 11 wells, median 189.5 pCi/L, range 64.0-320.0 pCi/L; none above any federal threshold
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