Government groundwater sampling in Navajo County’s aquifer N300COPLTS recorded radon-222 in three separate wells between August and October 2017. Each well, ranging from 150 to 700 feet deep, showed radon detection with a median concentration of 400.0 pCi/L and values ranging from 380.0 to 430.0 pCi/L. None of these samples exceeded federal health-based limits. This data reflects area conditions, not an individual household’s water.
Why Aesthetic Secondary Standards Differ from Health-Based Limits for Radon
Radon in water is a naturally occurring radioactive gas that can dissolve from underground rock formations into groundwater. Unlike substances regulated by aesthetic secondary standards, which address taste, odor, or staining, radon is regulated based on health risk thresholds because of its radioactive nature. The federal government has established limits to guide safety, but the sampled wells in Navajo County’s aquifer remain below those health-based limits. Therefore, detections here do not imply immediate health concerns related to drinking water.
What 'Detected', 'Median', and 'Range' Mean in This Sampling Record
The term 'detected' means that the radon concentration was measurable by the instruments used during sampling. A 'median' is the middle value of the radon levels recorded, showing a central tendency across the sampled wells. The 'range' indicates the spread from the lowest to the highest values detected within the three samples. Since all three wells showed detections, and all results remained below federal limits, this suggests consistent but variable radon presence across this part of the aquifer.
Which Fixtures, Appliances, or Processes Are Affected First and Why
Radon dissolved in water can be released into the air during household water use, especially when water is agitated or heated. Fixtures like showerheads, sinks, and appliances such as dishwashers and clothes washers release water vapor containing radon gas. Because radon is a gas, inhalation of radon released indoors typically presents a greater pathway for exposure than drinking water itself. Therefore, areas with poor ventilation or frequent water use may see more immediate effects of radon degassing.
Household or Facility Symptoms That Do and Do Not Point to Radon
Radon presence in water does not produce taste, odor, or visible changes. Symptoms such as staining, unusual taste, or immediate health effects are not indicators of radon contamination. Conversely, the only way to assess radon’s presence is through testing water with specialized laboratories. Radon is odorless and invisible; thus, household experiences generally cannot confirm or exclude radon concerns without test results.
What You Should Write Down Before Seeking Treatment Advice
- Record the source of your water (well or municipal supply).
- Obtain a certified laboratory test reporting radon-222 concentration specific to your water.
- Note any radon measurements from area aquifers or groundwater data, such as this report on Navajo County’s aquifer N300COPLTS, for context.
- Identify water use patterns and ventilation characteristics within your household.
With this information, you can evaluate whether treating radon in your water supply is appropriate. The Autotrol Radon in Water Filter system ships ready to configure and is documented to address radon in household water effectively.
In summary, government sampling confirms radon presence in Navajo County’s aquifer N300COPLTS at levels below federal health-based limits. Deciding on treatment involves obtaining your own water test results and understanding how radon affects water use in your home.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2017-10-03. 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 N300COPLTS aquifer (Navajo County): 3 results from 3 wells, median 400.0 pCi/L, range 380.0-430.0 pCi/L; none above any federal threshold
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