U.S. Geological Survey data from August 2010 show radon-222 was detected in all three groundwater samples from Lassen County's aquifer N100PCFNWV. Concentrations ranged from 320 to 600 pCi/L, with a median of 370 pCi/L. These samples come from wells 102 to 230 feet deep and provide a regional snapshot rather than conditions for individual wells.
How Radon Enters Groundwater in Lassen County
Natural Decay of Uranium-Bearing Minerals
Radon arises underground from uranium decay found in rocks and soil common to this area, dissolving into groundwater as it passes through aquifers.
Well Depth Influences Radon Presence
Deeper wells, such as those sampled, often show measurable radon since water has more time to accumulate the gas while underground.
Additional Questions for Commercial or Industrial Water Users
Higher Water Volumes Demand Greater Treatment Capacity
Large scale use requires considering radon levels alongside daily volume needs to select adequate filtration systems.
Regulatory Considerations Beyond Residential Use
Commercial operations may face monitoring or reporting requirements not applicable to household sources.
Judging Treatment Capacity Against Household Demand
Estimate Daily Household Water Consumption
Knowing your household’s average water use helps determine the capacity required to effectively reduce radon in your supply.
Choose a System That Handles Peak Usage
Systems should accommodate times of highest consumption to maintain consistent water quality.
Sample Size and Data Representativeness
Three Wells Sampled in the Same Aquifer
Measurements from three independent wells offer limited but valuable insight into regional radon levels.
Sampling Dates Concentrated in August 2010
Data reflect conditions during a specific period and may not capture seasonal or annual variation.
Interpreting Terms in the Sampling Record
What Detected Means
Radon was found in all samples, indicating its presence in the aquifer but not implying unsafe levels.
The Significance of Median and Range
The median value summarizes the central tendency across the three wells; the range shows variability measured.
Distinguishing Aesthetic Standards from Health Limits
Radon Has No Aesthetic Secondary Standard
Unlike some constituents, radon does not have regulations based on taste or appearance, only health-based guidelines.
Federal Levels for Radon Are Not Exceeded Here
None of the sampled wells surpassed federal recommended action levels, implying no regulatory violation within this dataset.
For households measuring their own radon levels, the Pentair Radon in Water Filter ships ready to configure and offers a documented method for addressing radon concentrations based on your household’s daily water demand.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2010-08-31. 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 N100PCFNWV aquifer (Lassen County): 3 results from 3 wells, median 370.0 pCi/L, range 320.0-600.0 pCi/L; none above any federal threshold
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