A common misconception is that detecting radon in water near Garrett County means your household water definitely contains high radon. The U.S. Geological Survey sampled groundwater in Garrett County’s aquifer 321CNMG and found radon present in all 8 wells tested, but no reading exceeded federal thresholds for radon concentration. Understanding what these measurements mean for your home starts with distinguishing area data from your own water quality.
If you are testing your water, start with simple steps before elaborate analysis
If you are noticing symptoms or water concerns you think might relate to radon, it’s best to begin by confirming basic water quality. Check for obvious factors such as taste, smell, or staining, which radon itself does not cause. From there, proceed to laboratory testing specifically measuring radon-222 concentration in a sample drawn directly from your household water system. This test provides the definitive data for your own water’s radon level, as area averages cannot substitute for a direct analysis.
If you look at Garrett County aquifer sample data to interpret your risk
The U.S. Geological Survey collected radon-222 data from 8 separate wells in Garrett County’s aquifer 321CNMG between 2010 and 2015. These wells ranged from 30 to 548 feet deep. The measured values ranged from 7.0 to 1210.0 picocuries per liter (pCi/L), with a median of 39.0 pCi/L. All eight wells had detectable radon but none surpassed the federal guidelines established for radon concentration in water.
This data means radon is naturally present in Garrett County groundwater, but the degree varies widely between wells. It cannot pinpoint your home's individual water quality or safety status. Only a specific test of your water can do that.
If you consider the number of samples and what it means for reliability
Eight samples collected over more than five years represent a limited but reasonable snapshot of radon levels within Garrett County’s aquifer 321CNMG. A smaller sample size can mean the range and median might shift if more wells were sampled. Therefore, while this data provides evidence that radon occurs but in variable amounts, it does not fully capture all possible fluctuations or localized conditions at every well in the area.
If you examine how sample and well depth affects radon expectations for your water
The sampled wells in this dataset ranged broadly in depth from 30 feet to over 500 feet. Radon concentrations can correlate to such depths because radon originates from natural uranium decay in underground rocks and soil. Shallow wells may have radon levels differing significantly from deeper wells depending on geology, water flow, and other factors. Your own well’s depth and construction are important to know when interpreting what regional radon data might imply for your water.
Once you have your water tested and know the radon concentration, the Autotrol Radon in Water Filter shipped ready to configure can help reduce radon levels effectively for a household water supply. This system provides a targeted solution tailored to the radon level measured in your water, helping improve your water quality with documented technology designed specifically for radon in water.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2015-08-18. 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 321CNMG aquifer (Garrett County): 8 results from 8 wells, median 39.0 pCi/L, range 7.0-1210.0 pCi/L; none above any federal threshold