A radon report can look like a string of numbers when all you want to know is whether your home needs attention. The key figure is usually the radon concentration, reported in picocuries per liter (pCi/L). Compare it with the U.S. Environmental Protection Agency’s action level, then consider how and where the test was performed. Results help guide your next step; they are not a reason to panic or a guarantee that every room has the same level.
Find the Main Number
Look for the average radon concentration and its unit, typically pCi/L. A result of 4 pCi/L means the test measured an average concentration at that level during the testing period. It does not mean the reading is identical at every moment or in every part of the house. Radon levels can vary by location, season, weather, and how a building is used.
Check the report for the test dates, device location, test duration, and whether the test was short-term or long-term. These details put the number in context. A measurement from a basement or lowest regularly used level may not match a reading upstairs. If anything is unclear or the test conditions were not followed, ask the testing provider to explain before deciding what to do.
Compare It With the Action Level
The EPA recommends taking action to reduce radon when a home’s level is 4 pCi/L or higher. This is a guideline for action, not a line between completely safe and dangerous: radon risk increases with exposure, and no level is known to be risk-free. A result below 4 pCi/L can still be worth reducing, especially if it is close to that level.
If your result is at or above 4 pCi/L, plan a follow-up step rather than dismissing it. The EPA recommends fixing the home when a long-term test shows 4 pCi/L or higher. For a short-term result, follow the report’s guidance and EPA recommendations on confirmation testing; a second test can help clarify the level. You can also contact a qualified radon professional to discuss an appropriate measurement and mitigation plan.
Know When to Test Again
Consider a follow-up test if the first result is near the action level, if test instructions or closed-house conditions were not maintained, or if the device may have been moved or disturbed. A long-term test, which runs for more than 90 days, can give a better picture of average exposure over time. A short-term test is faster, but it reflects a shorter window and may be more affected by temporary conditions.
Test again after major changes that could affect airflow or the foundation, such as finishing a basement, adding a living space below ground, or making substantial renovations. Retest after a mitigation system is installed to confirm it is reducing the level. Follow the system professional’s advice about ongoing checks, and keep a record of test dates, results, device locations, and any work completed.
Decide Whether to Mitigate
Mitigation is the process of reducing radon entry or moving radon from beneath a building to the outdoors. A common approach uses a vent pipe and fan to draw soil gases from below the foundation and release them outside. The right method depends on the home’s foundation, layout, and test results, so a qualified professional should assess the building and explain the proposed system.
After installation, test again to verify the result, and check the system’s indicator or warning device as instructed. If the follow-up reading remains elevated, contact the installer to review performance and next steps. Motor City Radon serves Detroit homeowners who want help understanding a report or arranging radon testing; compare the result, testing conditions, and your home’s needs before choosing a service.
Start with the reported average, confirm the unit and test conditions, and compare the result with the EPA’s 4 pCi/L action level. When a reading is high, uncertain, or close to the guideline, follow up with appropriate testing and professional advice. Keep your report handy, and reach out to a qualified radon service if you would like help planning the next step.