ResourcesGlossary: testing
Lowest lived-in level
Short answer
The lowest lived-in level is the lowest floor of a home that people regularly use, and it is where EPA says to place a radon test: the basement if it is frequently used, otherwise the first floor.
What lowest lived-in level means
For a home sale EPA widens it to the lowest level of the home that could be used regularly, whether it is finished or unfinished, since a buyer may choose to live in a lower area of the home than the seller did.
The reason is where radon collects. CDC says radon levels are often higher in basements and lower levels.
How high off the floor the device sits
EPA says to place the device at least 20 inches above the floor. Each row converts that height.
| Unit | Height |
|---|---|
| Inches | 20 |
| Feet | 1.67 |
| Centimeters | 50.8 |
What it means for your home
Within that level, keep the device away from drafts, high heat, high humidity and exterior walls. EPA also rules out a closet, stairway, hallway or crawl space.
The level can change with how you live. EPA says that if your living patterns change and you begin occupying a lower level of your home, such as a basement, you should retest on that level.
Where to go next
- Which radon test to use. Pick the test, then place it on this level.
- Where a radon test should be placed. The room, the height and the spots to avoid.