Radon Levels in Kitsap County Water: Understanding Local Aquifer Data for Your Home
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If you want to understand what a radon-in-water lab report actually shows
A laboratory test report for radon in water typically lists how much radon-222 activity is measured in picocuries per liter (pCi/L). This value reflects the concentration detected in a specific water sample—not the entire water source or your household's water supply. Reports usually include the sample location, collection date, and the detection limit. For Kitsap County aquifer wells sampled by the U.S. Geological Survey in 2021, radon was detected in all 18 wells, ranging from 45.0 to 167.0 pCi/L, with a median of 77.5 pCi/L. These results describe separate wells 16 to 27 feet deep from this aquifer area, but they do not reveal the exact radon level in your household water without a test of your own supply.
If you want to compare Kitsap County aquifer radon to neighboring county data without overreading the numbers
Radon levels can vary between aquifers and counties due to geology and other factors. The Kitsap County data is specific to a cluster of wells in this aquifer sampled over a two-month span. Comparing it with radon data from a neighboring county requires caution—it shows only a regional snapshot, not a trend or prediction for your own water. Variation in radon across small distances is common. Without sampling your own well, you can't assume your home's radon level matches the median or range found in this area. Using this data helps understand how common radon detections are here, but it does not establish your home's radon concentration.
If you want to know how public water system radon records differ from what private well testing tells you
Public water systems must monitor radon and report compliance with federal thresholds. Kitsap County public systems often blend multiple wells, and their radon records reflect an averaged or treated supply. Private well users rely on individual well testing, which directly measures your specific water source. Public system records may not reflect your well’s radon level, and vice versa. Therefore, private well owners should have their water tested for radon to obtain an accurate measurement. Government sampling of area wells informs what might be expected regionally but does not replace testing water drawn from your home.
If you want to know what a homeowner’s reading of median and range in this record means for your water
The median radon level of 77.5 pCi/L means half of the wells sampled in this Kitsap County aquifer had radon below that activity and half above, with individual results ranging from 45.0 to 167.0 pCi/L. Since all samples detected radon but none exceeded federal thresholds, the reported radon levels fall within regulatory limits for water supplies. For your household, knowing where your water fits within this range requires a direct test of your well. This area’s data suggests radon is commonly present but not necessarily at problem levels in every well. Testing your own water tells you if treatment is needed based on your measured result.
If you want a treatment option that addresses radon found in Kitsap County wells
Radon removal from household water can be achieved with specialized equipment designed for this purpose. The C-Series Radon in Water Filter uses technology documented to effectively reduce radon concentration from water entering your home. It ships ready to configure for connection to your water line and works by reducing radon activity before water reaches your fixtures. This technology helps homeowners control radon exposure from their water source after confirming a need via testing.
If you want to know which parts of your home water system will reflect radon reduction first and why
Radon treated by the C-Series system will affect all water flowing through the home, but hot water fixtures may show differences more slowly due to tank storage and mixing. Cold water taps, such as kitchen sinks and outdoor faucets, typically exhibit reduced radon levels first. This is because the treated water flows directly to these points without delay. Appliances that use cold water, like ice makers or reverse osmosis units, also benefit initially from treated water. Consistent reduction depends on treating the entire household supply at the point it enters your home.
Summary
Government sampling of 18 wells in Kitsap County's aquifer shows radon-222 at levels detected in all samples, with median and range well below federal thresholds. While this indicates radon presence is common in the area, only a test of your household water can reveal your actual radon level. Public supply data differ from private well testing and cannot substitute for it. If your water test shows radon that you want to reduce, the C-Series Radon in Water Filter offers a proven treatment technology that ships ready to configure for household use, addressing radon activity aligned to your measured demand.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2021-05-26. 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 aquifer (Kitsap County): 18 results from 18 wells, median 77.5 pCi/L, range 45.0-167.0 pCi/L; none above any federal threshold