Radon in Alabama
The U.S. EPA and the U.S. Geological Survey have evaluated the radon potential in the
U.S. and have developed this map to assist National, State, and local organizations to
target their resources and to assist building code officials in deciding whether
radon-resistant features are applicable in new construction. This map is not intended to be
used to determine if a home in a given zone should be tested for radon.

Homes with elevated levels of radon have been found in all three zones. All homes should
be tested regardless of geographic location. The map assigns each of the 3,141 counties
in the U.S. to one of three zones based on radon potential. Each zone designation reflects
the average short-term radon measurement that can be expected to be measured in a
building without the implementation of radon control methods. The radon zone designation
of the highest priority is Zone 1.

The Madison County area is in Zone 1 and, as such, I always recommend a radon
test be done in all real estate transactions.
 Should a high level of radon be found,
there are mitigation methods that work quite well at lowering the radon to safer levels.  I
use a Sun Nuclear continuous radon monitor.  Ideally the monitor should be left in the
home for a period of 48 hours.  At the end of this time period, I pick up the monitor and
download the results to the computer and email a report.  For further information about
radon, visit the
EPA radon website
  • Zone 1
Highest Potential (greater than 4 pCi/L)
  • Zone 2
Moderate Potential (from 2 to 4 pCi/L)
  • Zone 3
Low Potential (less than 2 pCi/L) Zone 3 Low Potential
(less than 2 pCi/L)
What is Radon
Radon is the second leading cause of lung cancer (cigarette smoking is #1) in the United
States and causes an estimated 20,000 lung cancer deaths per year.

Radon is a colorless, odorless radioactive gas that comes from the decay of uranium in
the earth and occurs in all homes. Nearly one out of every 15 homes in the US is
estimated to have an elevated level of radon.

Radon Testing
Radon levels are expressed in picocuries per liter of air (pCi/L) where a picocurie is a
measure of radioactivity. The higher the level of radon in a home, the greater the risk.  
The national average of indoor radon level in homes is about 1.3 pCi/L.  The EPA has
set a level of 4 pCi/L as the threshold at which to take action to mitigate (lower) the level
of radon in a home in order to reduce one’s risk of lung cancer.
Pride Home Inspection