Comparing Hillsborough County Radon Results with Neighboring Counties Without Overreading
Many people assume that radon levels in water from nearby counties or aquifers can directly predict their own water’s radon concentration. However, government groundwater samples collected from 10 wells in Hillsborough County's 112NRSD aquifer show a median radon-222 activity of 490.0 picoCuries per liter (pCi/L), with a range from 91.0 to 1960.0 pCi/L. All wells sampled, between 14 and 64 feet deep, detected radon within this span but none exceeded federal guidelines. Comparing these figures with neighboring counties’ data can offer general context, but such regional sampling is not a substitute for a specific test of your household water source. Radon concentration can vary well by well even within the same aquifer and geographic vicinity.
Understanding Certified Lab Test Reports for Radon in Household Water
When you receive a laboratory analysis for radon in your water, the report will list radon-222 activity often in picoCuries per liter (pCi/L). The values are specific to the sample provided, indicating the radon concentration at that moment from your particular water supply. Unlike area-wide sampling, this is your home's radon level and can vary substantially from the county median or range. The report may also compare your result against federal or state guidance levels. It is important to understand that "detected" radon means an instrument has measured it; it is not itself a violation or proof the water is unsafe. Only an actual test of your well or supplied water accurately characterizes your situation.
Long-Term Effects of Untreated Radon in Residential Water
If radon is present in water and enters indoor air during household use such as showering, it can contribute to indoor radon levels which are more commonly linked to health concerns. Leaving radon untreated over many years may increase potential exposure through inhalation of radon gas released from water. However, radon in water generally contributes less to indoor radon than soil gas infiltration. The rate at which radon dissipates depends on water use habits, ventilation, and water source. Addressing radon in water is often part of an overall radon reduction strategy when high levels are detected in the household air or water.
Plumbing Materials and Age: Independent from Source Water Radon Levels
The materials and age of plumbing in your home do not influence the radon content naturally present in groundwater. Radon-222 is a radioactive gas dissolved in water that originates from natural decay of uranium in underground rocks and soils. While plumbing components may corrode or leach substances affecting water quality, they neither generate nor remove radon. Therefore, radon levels measured reflect the water source and not the construction of household piping. Plumbing condition can affect other water quality factors but not radon concentration itself.
How Radon Enters Groundwater and Distribution in Hillsborough County
In Hillsborough County, radon in groundwater arises from natural radioactive decay of uranium present in local geologic formations feeding the 112NRSD aquifer. Radon dissolves into water as it moves through subsurface rocks. Because radon is a gas, it tends to diffuse upward when water reaches the surface or indoor plumbing. Public water systems usually aerate and blend water, reducing radon concentrations before distribution. Private wells drawing directly from the aquifer can carry the dissolved radon into household plumbing unless treatment methods are applied.
What Not to Assume from Hillsborough County Radon Data Alone
Government sampling provides useful insight into radon occurrence in the region but should not be used to infer your household’s radon concentration. Sampling data are from a limited number of wells tested several years ago and represent a range, not a specific reading. Detecting radon in the area does not mean your water exceeds any regulatory limit or is unsafe by itself. To know your home's water radon level precisely, arrange for a certified laboratory test of your water. If radon treatment is desired, the C-Series Radon in Water Filter system ships ready to configure and operates to reduce radon levels effectively based on documented technology.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2012-11-14. 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 112NRSD aquifer (Hillsborough County): 10 results from 10 wells, median 490.0 pCi/L, range 91.0-1960.0 pCi/L; none above any federal threshold