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What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page

Government sampling of groundwater in Broward County’s aquifer 112BSCNN found Radon-222 in every well tested, from 66.0 to 740.0 pCi/L, with a median concentration of 470.0 pCi/L across 13 wells sampled in 2016. Here, "detected" means the instrument measured radon in every sample; "median" is the middle value when results are ordered; and "range" indicates the lowest and highest concentrations recorded. These values describe the area's typical radon presence but are not measurements of your household water.

Why Aesthetic Secondary Standards Differ from Health-Based Limits, Applied to This Constituent

Radon in water is measured differently from aesthetic issues like taste or staining. Federal guidelines include health-based limits for radon in water, yet none of the Broward County wells tested exceeded these thresholds. A detection or range above aesthetic secondary standards does not mean the water is unsafe; it only reflects an amount that might affect water characteristics. Actual health risks, if any, depend on your specific water, which only testing your own well can determine.

What Questions a Commercial or Industrial Operator Adds That a Household Does Not

Commercial or industrial water users typically require detailed radon profiling over time and across multiple depths to comply with regulatory needs and process safety. They also consider how radon interacts with other water quality factors under operational conditions. Household water use rarely involves these complexities but still benefits from knowing if radon is present and how to reduce it, especially when private wells supply drinking water.

How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means

The radon data for Broward County come from 13 samples collected from separate wells ranging from 22 to 152 feet deep, across a span of two months in 2016. While this provides a snapshot of radon levels in the aquifer, it cannot capture every variation within the entire county or all well depths. Limited sampling means local conditions may differ, reinforcing the importance of testing your own water before concluding radon levels at your household.

How to Compare This Area's Record with a Neighboring County's Without Overreading It

Different counties can have varying radon concentrations due to geological factors affecting aquifers. Comparing Broward County's median and range to a neighboring county's data highlights regional differences but should not be used to assume your own water quality. Each aquifer and well system has unique characteristics, so government data serve as a guide rather than a definitive test of your household water.

How Sample Depth, Well Depth or Source Type Changes What a Reader Should Expect

The sampled wells in Broward County ranged from shallow (22 feet) to moderately deep (152 feet). Radon levels can vary with well depth because radon naturally decays or dissipates as water moves through geological formations. Source types such as groundwater from deep confined aquifers may show different radon profiles than surface water. Knowing your well depth and source helps interpret how applicable area-wide data may be to your situation, but direct testing remains essential.

Government sampling for radon in Broward County’s aquifer 112BSCNN covered 13 wells with results from June to August 2016. For detailed figures and updates, consult the U.S. Geological Survey groundwater data.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2016-08-30. 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 112BSCNN aquifer (Broward County): 13 results from 13 wells, median 470.0 pCi/L, range 66.0-740.0 pCi/L; none above any federal threshold