Should Radon Testing Be Done in Newly Built Homes in Milwaukee, WI?

Are New Homes in Milwaukee, WI at Risk for Radon?

Yes—newly constructed homes in Milwaukee, WI can have elevated radon levels, just like older properties. Many residents assume that modern construction methods eliminate this risk, but radon comes from naturally occurring uranium in the soil, not from building age or materials. Once radon gas seeps into a home—often through the basement or slab—it can accumulate to levels that may affect health.

Even homes built to the latest codes can test high for radon because:

• Local geology, not building age, determines radon potential.
• Foundations, cracks, and joints in new concrete can allow entry.
• Higher energy efficiency (tight building envelopes) traps indoor air, potentially increasing radon buildup.

Why Don’t Building Codes Always Prevent Radon?

Construction codes in Milwaukee, WI may require some radon-resistant features in new buildings, such as vapor barriers or passive venting, but these features are not guaranteed to keep levels low under real living conditions. The codes often focus on minimizing entry—not on verifying actual concentrations after occupancy.

Some newer homes have “radon rough-in” systems (passive pipes that could be upgraded), but:

• These systems rely on the stack effect, which might not be enough to reduce radon below recommended action levels.
• Building codes do not mandate post-construction radon testing, so actual risk remains unknown without a test.

What Are the Recommended Radon Testing Practices for New Homes?

Health authorities, including the U.S. Environmental Protection Agency and the Wisconsin Department of Health Services, recommend testing all homes for radon after occupancy, regardless of age. In practice for Milwaukee residents:

• Test a new home after construction is complete and before moving in, if possible.
• If the home was never tested post-construction, test as soon as practical—even within the first heating season.
• Retest every few years or when making major renovations, adding a finished basement, or altering ventilation.

Short-term radon test kits are inexpensive and easy to use. These are typically left in the lowest lived-in level (often a basement) for several days during colder months when windows are closed.

What Makes Milwaukee, WI Homes Especially Relevant for Radon Testing?

The region’s geology features glacial soil and bedrock conditions that commonly produce radon. Milwaukee’s seasonal weather, with cold winters, means homes are typically closed up for months at a time, allowing radon to collect indoors.

Additional local considerations:

• Many new homes in the area have basements or slab-on-grade foundations, both of which can be entry points for radon.
• New developments may disturb underground soils, temporarily increasing radon migration into buildings.
• Community awareness programs periodically encourage residents to participate in radon risk reduction, but testing rates in new homes remain lower than ideal.

Common Misconceptions About New Construction and Radon

Residents sometimes believe these false assumptions:

• “My home is brand new; there’s no way radon could be an issue.”
• “There’s already a pipe in the basement, so I’m safe.”
• “Radon is only a problem in old, drafty houses.”

In reality, even new, tightly sealed homes can accumulate radon. Passive systems (unpowered pipes) can help, but only a test will confirm whether levels are safe. The presence of radon-resistant features is positive but doesn’t guarantee consistently low radon.

How Should Residents Respond if Radon Is Found in a New Home?

If radon is detected above 4.0 pCi/L (picocuries per liter)—the EPA action level—mitigation is strongly recommended. For levels between 2.0 and 4.0 pCi/L, consider further testing or mitigation to reduce long-term exposure. In Milwaukee, mitigation typically involves enhancing ventilation or converting a passive system into an active one using a fan.
If you’re buying a newly built home, check for a recent radon test result and ask if a passive or active radon system is installed. Even if a test was recently performed, re-testing is advisable after the first winter or after living in the home for a while, as occupancy and weather patterns may influence results.

What If My New Home Was Already Tested by the Builder?

Some builders in Milwaukee may provide test results from the final stage of construction, but conditions might not reflect actual living situations:

• Testing may have occurred before the HVAC system was fully functional.
• Doors and windows might have been left open during the final cleanout.

Retesting after move-in, during normal living conditions, offers a more accurate reading. It's a small investment for peace of mind, especially considering radon’s long-term health risks.

Testing is the only way to know if your new home, no matter how modern, is at risk. Being proactive means residents can address issues promptly, safeguarding household health in every Milwaukee home—old or new.