Know Your Indoor Radon Levels Before They Become a Problem

Professional radon testing for homeowners throughout Northeast, WI.

Radon gas seeps into homes through foundation cracks, sump pits, and gaps around utility lines, and because it has no smell or visible signs, the only way to know if your indoor air contains unsafe levels is to test for it. Radon Safe Homes and Businesses conducts short-term and real estate-ready radon testing for homeowners who want to check their baseline levels, confirm safety before a home sale, or establish pre-mitigation readings. The test uses calibrated equipment placed in the lowest occupied level of your home, typically a basement or ground floor, and runs for minimum 48 to 72 hours to capture an accurate measurement.

Testing is performed according to industry protocols, with clear reporting that shows your radon concentration in picocuries per liter. If results show levels at or above 4.0 picocuries per liter, the EPA recommends mitigation, and Radon Safe Homes and Businesses provides guidance on next steps and mitigation options. Testing is also useful for routine safety checks every few years, especially in homes with basements or crawl spaces where radon accumulation is more common. The service includes placement, retrieval, analysis, and a written report with easy-to-understand results.

If you want to know whether radon is present in your Northeast WI home, book a residential radon test with Radon Safe Homes and Businesses today.

What Happens During a Radon Test in Your Home

The test begins when a technician places a radon detection device in the lowest occupied level of your home in Northeast WI, usually in a basement, family room, or first-floor living area. The device is small, battery-powered, and left in place for 48 to 72 hours with windows and exterior doors kept closed as much as possible to avoid diluting the test results. You can continue living in the home during the test, but you should avoid opening windows in the test area or running high-volume exhaust fans like whole-house ventilation systems.

After the test period, the technician retrieves the device and analyzes the data to determine your average radon concentration. You receive a written report within a few days that shows your radon level in picocuries per liter and includes guidance on whether mitigation is recommended. If levels are below 4.0, no action is needed, though retesting every two to five years is a good practice.

The test does not require any preparation beyond identifying a suitable location and ensuring access to the lowest level of your home. It does not measure radon in water, soil, or outdoor air, only indoor air concentration in the tested space. Results are valid for the conditions present during the test period, and seasonal variations or home renovations may affect radon levels over time.


We offer professionally certified, accurate radon measurement services using modern electronic Radstar CRMs (Continuous Radon Monitors). We also provide test kits from independent, reputable third-party labs. One is included with each radon system.


We proudly recommend purchasing radon test kits from AccuStar for accurate and reliable radon testing results.

Homeowners Often Have These Questions Before Testing

Most homeowners want to know how the test works, what affects the results, and what they should do if radon levels come back elevated.

How long does a residential radon test take?
The test device remains in your home for 48 to 72 hours to capture an accurate average radon concentration. Setup takes only a few minutes, and retrieval is done by the technician at the end of the test period.
What should I do to prepare for the test?
You do not need to do anything special before the test, but you should identify the lowest occupied level of your home and make sure the technician has access to that area. During the test, keep windows and exterior doors in the test area closed as much as possible.
What does the test measure?

The test measures the concentration of radon gas in the air, reported in picocuries per liter. It does not test water, soil, or outdoor air, only the indoor air in the space where the device is placed in Northeast WI.

What happens if my radon levels are elevated?
If results show levels at or above 4.0 picocuries per liter, the EPA recommends mitigation. Radon Safe Homes and Businesses provides guidance on next steps and can design a mitigation system tailored to your foundation type.
How often should I test for radon?
You should test every two to five years, or sooner if you make changes to your home like finishing a basement, adding a crawl space encapsulation, or installing a new HVAC system. Testing is also recommended before buying or selling a home.

If you are ready to test your home for radon and receive clear, accurate results that help you decide whether mitigation is needed, learn more about testing options with Radon Safe Homes and Businesses and schedule your test in Northeast WI.