Radon Mitigation in Centralia, Missouri

About Centralia

Centralia is a historic community in northern Boone County, located about 20 miles north of Columbia along Highway 63. The town has a rich history dating back to the mid-1800s, and its housing stock reflects that history—ranging from well-preserved older homes near the downtown area to more recent construction on the outskirts.

This mix of home ages means a variety of foundation types, construction styles, and potential radon entry points. Older homes may have more cracks and openings in the foundation due to settling over time, while newer homes may have different foundation configurations. Missouri DHSS reports that radon is present in every Missouri county, and that one in three homes tested through its residential testing program had results above the recommended action level. This guidance applies to Centralia.

Testing your Centralia home

Every home in Centralia should be tested for radon at least once, regardless of age or foundation type. Older homes may have more foundation cracks and openings where radon can enter, but newer homes are not immune—radon can enter any home through any opening in contact with the soil.

Short-term tests (2–7 days) give a quick snapshot, while long-term tests (90+ days) provide a better picture of your year-round average. Missouri residents may request one free short-term radon test kit per household while supplies last through the Missouri DHSS. For real-estate transactions, Missouri recommends professional testing with a continuous radon monitor.

If your result is at or above 4.0 pCi/L, the EPA and Missouri DHSS recommend taking action to reduce radon in your home. If the result is between 2.0 and 4.0 pCi/L, consider taking action and reviewing the test conditions.

Mitigation for Centralia homes

Centralia's range of home ages means that mitigation systems need to be tailored to each home's specific foundation and condition. A qualified radon professional will evaluate your foundation type, the condition of your floor and walls, and the best path for pipe routing:

• Basement homes: Sub-slab depressurization draws radon from beneath the floor. Older basements may benefit from additional crack sealing to improve system efficiency.
• Crawl-space homes: A vapor barrier is sealed over the soil, and a fan draws radon from beneath the barrier. Older crawl spaces may need more preparation work.
• Slab-on-grade homes: A suction point through the slab connects to a pipe and fan, with the pipe routed to the exterior.

Missouri recommends checking that your radon professional holds NRPP or NRSB certification.

Cost of mitigation in Centralia

Missouri DHSS reports that radon mitigation commonly ranges from approximately $500 to $2,500, depending on the home's size and construction. Older homes in Centralia may require more sealing work—crack repair, sump pit sealing, or additional preparation—which can affect the total cost. The only way to know the cost for your specific home is to request a quote from a qualified professional.

Radon and home sales in Centralia

Centralia's historic character and range of home ages make radon testing an important part of real-estate transactions. Radon testing is commonly part of the inspection contingency. Missouri recommends professional testing with a continuous radon monitor for legal-transaction testing. If the result is at or above 4.0 pCi/L, mitigation can be negotiated between buyer and seller—often as a repair credit or a condition of the sale.

For sellers, a pre-listing radon test can help you understand your home's level and address it proactively. A properly installed mitigation system can be a selling point, showing buyers that the home has been tested and addressed.