Pentair Radon in Water Filter

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Sampling scope: seven wells shape our understanding

Seven groundwater wells from Medina County’s aquifer 218EDRDA were sampled between February 28 and March 28, 2017. These wells, ranging from 715 to 2550 feet deep, provide the basis for radon-222 measurement data in the area. The small sample size means the data represent only those specific wells and do not establish the radon level in any individual household’s water source. Each well’s water can differ significantly. The median radon concentration across these seven wells was 7.0 pCi/L, with individual results spanning from 20.0 to 69.0 pCi/L. No readings exceeded federal guidelines for radon in water during this sampling period.

Interpreting median and range: what a homeowner sees

As a homeowner reviewing this data, the median of 7.0 pCi/L indicates that half the sampled wells had radon levels below this concentration and half above. The range, from 20.0 to 69.0 pCi/L, shows variability—some wells contained radon at levels several times higher than the median. This spread implies that individual water supplies may experience higher or lower radon concentrations than the regional median suggests. Deciding on a water treatment option depends on understanding where your water might fall within this range. Testing your own well water is essential for accurate assessment.

Seasonal and multi-year variation in area radon readings

The data were collected within a one-month window in early 2017. Although this snapshot doesn’t capture seasonal or annual fluctuations directly, the close timing of the sampling suggests limited seasonal variation in these wells during that period. Generally, radon levels in groundwater can change with temperature, precipitation, and water table variations over time. Without multi-year data, predicting long-term trends is not possible. Homeowners should consider periodic testing to monitor these potential changes.

Household fixtures and processes first affected by radon in water

Radon in water mainly impacts household air quality when water is aerated or heated, releasing radon gas into indoor air. Fixtures like showers, faucets, hot water heaters, and appliances that agitate or warm water contribute most to this transfer. Concern centers on the amount of radon released during water use rather than direct ingestion through drinking. Understanding which home uses increase radon release can guide targeted treatment decisions and exposure reduction strategies.

Radon’s source and movement in Medina County groundwater

Radon-222 originates from the natural radioactive decay of uranium in underground rocks and soils. In Medina County’s aquifer 218EDRDA, radon enters the groundwater through rock fractures and porous media. Its concentration depends on geological formations and groundwater flow paths. Because radon is a gas, it can migrate from rock into water stored in aquifers before flowing to wells. This natural occurrence varies locally, explaining the range of detected concentrations across sampled wells.

What the area data cannot tell you about your own water

These regional sampling results do not indicate your household’s radon level. They are not a substitute for testing your individual well or water source. The range and median values describe concentrations only in the tested wells, not your own. No conclusion about safety or violation status can be drawn from area data alone. If radon is a concern, having your water analyzed by a qualified laboratory is the only way to know your exact radon level and choose appropriate steps.

For addressing radon in household water, the Pentair Radon in Water Filter ships ready to configure and effectively reduces radon gas from water supplies. Considering local radon data alongside your water’s own results helps in selecting the right treatment capacity and system features.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2017-03-28. 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 218EDRDA aquifer (Medina County): 7 results from 7 wells, median 7.0 pCi/L, range -20.0-69.0 pCi/L; none above any federal threshold