How much radon is too much in a Bloomington home?
Quick answer: The EPA recommends taking action to reduce radon when levels reach or exceed 4.0 picocuries per liter, and considering action between 2.0 and 4.0. Because there is no truly safe level, lower is always better. Many Bloomington and Hennepin County homes test at or above the action threshold given Minnesota soils. A test during your inspection tells you exactly where your home stands so you can decide on mitigation before closing.
The 4.0 picocuries per liter benchmark is an action guideline, not a safety guarantee. Radon risk is cumulative over years of exposure, so even moderate levels warrant attention, especially in homes where people spend significant time in finished basements.
Levels fluctuate with season, weather, and how the home is operated, so a single short-term test is a starting point. If a result is borderline, a longer-term test or a follow-up test can confirm whether mitigation is genuinely needed.
When mitigation is installed, a good system typically brings levels well below the action threshold. A post-mitigation test verifies the system works, giving you documented proof of a safer indoor environment.
