Is there radon in your household water? The USGS has sampled 23 wells in New Castle County’s aquifer 125RCCS and found radon in every one. This page explains what that means for you and how to approach radon in your water.
What 'Detected,' 'Median,' and 'Range' Mean in the Sampling Record
Detected Radon in All 23 Wells
Every sample taken from June to August 2015 showed radon-222 presence, confirming radon is naturally present in the aquifer’s groundwater.
Median Radon Level at 223.0 pCi/L
This median value means half the sampled wells had radon levels above 223.0 pCi/L, and half had levels below it.
Range from 85.0 to 1870.0 pCi/L
Radon measurements varied significantly, showing some wells with much higher concentrations than others, measured at depths between 66 and 300 feet.
What the Measured Range Means Against the Federal Standard—and What It Does Not
All Results Below Federal Threshold
None of the radon levels in the sampled wells exceeded federal action levels. Detection does not imply violation or immediate health danger according to regulatory guidelines.
Sampling Does Not Equal Individual Well Status
The data reflect regional groundwater conditions. Testing your own well’s water is necessary to determine your household’s specific radon presence.
Why Aesthetic Secondary Standards Differ from Health-Based Limits for Radon
Radon Is a Radioactive Gas, Not an Aesthetic Issue
Unlike substances regulated for taste or staining, radon’s primary concern is long-term health effects, governed by federal health-based standards, not aesthetics.
No Aesthetic Secondary Threshold Applies
Radon is not subject to secondary standards since it does not affect water taste, color, or odor.
How the Pentair Radon in Water Filter Removes or Neutralizes Radon
Targeted Radon Reduction Technology
The Pentair system uses specialized filtration methods designed to reduce radon levels in household water supplies, improving water quality regarding radon content.
Ships Ready to Configure for Home Use
The system is provided as a ready-to-use unit, allowing homeowners to add radon filtering capability to their water setup without additional service steps.
A Worked Example: Reading the Median and Range as a Homeowner
Interpreting the Median Radon Level
Knowing the median is 223.0 pCi/L suggests that radon presence is common and moderate in this aquifer zone, but it does not predict your specific water’s radon.
Considering the Range for Possible Higher Exposure
Because measurements span as high as 1870.0 pCi/L, some wells may have notably higher radon, reinforcing the need for individual water testing.
Maintenance Rhythm of the Pentair Radon in Water Filter in Plain Terms
Regular Filter Checks Are Recommended
Periodic inspection and timely replacement of the filter media keep the system effective against radon buildup.
Simple Component Replacement
The filter components are designed for user-friendly replacement intervals, supporting ongoing radon reduction without complex servicing.
Understanding USGS radon data for New Castle County water is a first step in evaluating your household’s water safety. Testing your own water and considering a targeted treatment like the Pentair Radon in Water Filter can help manage radon in your home’s water supply.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2015-08-20. 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 125RCCS aquifer (New Castle County): 23 results from 23 wells, median 223.0 pCi/L, range 85.0-1870.0 pCi/L; none above any federal threshold
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