Radon in Harris County Water: Deciding How to Address Detected Levels
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If you notice unusual taste or odor but have no test yet
Begin with simple checks: review any recent changes to your water fixtures or plumbing that might explain the change. Confirm whether others in your area report similar water characteristics. Household observations can indicate a water quality change but don’t confirm radon presence or levels.
Radon, a naturally occurring radioactive gas, can dissolve into groundwater, especially from deep aquifers like Harris County’s 121EVGL. Sensory signs alone are not reliable for radon identification since radon is odorless and tasteless at typical concentrations.
If you have municipal water service or a private well without recent radon testing
Understand that government monitoring in Harris County’s aquifer 121EVGL found radon-222 in all tested wells, with levels ranging from 640.0 to 2510.0 pCi/L and a median concentration of 950.0 pCi/L. These wells, from 1305 to 1641 feet deep, represent area groundwater but not individual household sources.
Municipal water systems are regularly tested and comply with federal safety standards. No radon result from this aquifer’s samples exceeded federal thresholds, so if you have municipal water, review your system’s water quality reports for any radon findings. Private wells require individual testing because area results are not specific to your source.
If you operate a commercial or industrial facility in Harris County
Additional considerations include volume demands, regulatory requirements, and monitoring frequency beyond household needs. Commercial operators should verify radon testing under applicable regulations and consider specialized treatment capacities. Radon levels may vary across supply points, so comprehensive testing helps guide appropriate filtration or removal technology choices.
If your household experiences symptoms such as respiratory irritation or plumbing corrosion
Symptoms like respiratory issues or equipment damage are seldom directly attributable to radon in water since radon primarily enters indoor air through soil gas and only to a lesser degree through water use. Other water quality issues or indoor air sources often explain such symptoms better.
If radon exposure through water is a concern, focus on laboratory testing of your water supply to measure radon-222 concentration accurately. This step clarifies the need for treatment and what level of reduction equipment should target.
If your well depth, source characteristics, or seasonal changes seem to affect water quality
Radon concentration in groundwater often correlates with aquifer depth and geology. The sampled wells in Harris County’s 121EVGL ranged between 1305 and 1641 feet deep. Wells shallower or in different formations may yield different radon levels. Seasonal variations can influence groundwater radon, but typical household sampling timing provides a reliable baseline.
Knowing your own water’s radon level requires testing from a certified laboratory. Only individual testing reveals your well’s radon concentration and informs treatment decisions.
Choosing equipment after measuring your household radon level
Once you have your radon-222 concentration from certified testing, selecting treatment is the next step. The Fleck Radon in Water Filter is designed to reduce radon in residential water supplies effectively. It ships ready to configure, suited for the median and range of radon levels documented in Harris County’s aquifer 121EVGL.
Evaluating your test results against the documented area data and your water demand helps determine if this system fits your household’s needs for radon reduction.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2015-07-20. 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 121EVGL aquifer (Harris County): 23 results from 12 wells, median 950.0 pCi/L, range 640.0-2510.0 pCi/L; none above any federal threshold