How to Interpret Radon Test Results During Home Inspections

March 19th, 2025 by Sherwin Sape

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Understanding Radon and Its Risks

Radon is a naturally occurring radioactive gas that can seep into homes through cracks in the foundation, walls, and other entry points. While invisible and odorless, radon poses serious health risks, including an increased risk of lung cancer. Testing for radon is a critical part of home inspections, providing valuable insights into indoor air quality and safety.

How to Read Radon Test Results

Radon test results are typically measured in picocuries per liter of air (pCi/L). The Environmental Protection Agency (EPA) recommends taking action if radon levels are at or above 4.0 pCi/L. Understanding the difference between short-term and long-term test results is crucial:

Short-term tests provide a quick snapshot of radon levels, usually over a period of 2 to 90 days.
Long-term tests measure radon levels for more than 90 days, offering a more comprehensive view of exposure over time.

Both types of tests are useful, but long-term testing gives a clearer picture of year-round radon exposure.

What Different Radon Levels Mean

Below 2.0 pCi/L: Generally considered low risk.
2.0 to 4.0 pCi/L: Some risk present; consider mitigation to further reduce radon levels.
Above 4.0 pCi/L: High risk; professional radon mitigation is strongly recommended.

Taking Action Based on Radon Test Results

If your radon test results show elevated levels, it’s important to consult a radon mitigation professional. They can assess your home and recommend effective solutions, such as:

Installing a radon reduction system.
Improving ventilation to reduce radon concentration.

After mitigation, retesting ensures that radon levels remain within a safer range over time.

Ensuring a Safe Home Environment

Interpreting radon test results is a vital step in protecting your home and health. By understanding what the numbers mean and taking appropriate action when necessary, you can reduce the risks associated with radon exposure and maintain a safer living environment. If you're concerned about radon levels in your home, contact Maine Radon and Water Treatment for professional testing and mitigation services. Call 1-207-742-8390 or visit maineradonwater.com to schedule an appointment today.