State radon guide
Radon Testing, Mitigation Costs & Contractors in Missouri
Missouri DHSS provides radon testing, mapping, and mitigation information. Because indoor levels vary from building to building, homeowners should test the property rather than rely on a county average.
Testing your home
Residents may test their own homes using an appropriate device. Missouri says radon professionals should be used for testing connected to legal transactions and recommends NRPP/NRSB-certified contractors.
Missouri offers one short-term radon test kit per household at no cost while supplies last using the state's current ordering process. Verify the coupon/order workflow before launch.
Programs and inventory can change. Confirm current availability with the listed agency before relying on an offer.Mitigation cost planning
Estimate only: a professionally installed residential radon mitigation system often falls in a broad $1,200–$3,500 range, but the final price can be lower or higher. Foundation type, crawlspaces, finished basements, multiple suction points, fan/pipe routing, electrical work, permits, diagnostics, and post-mitigation testing can materially change the quote. Use local written bids rather than treating this range as guaranteed pricing.
A test result provides important context, but it does not directly increase the modeled price.
Missouri rules and public resources
Needs Legal Verification: Missouri's current page states that radon professionals must be used for legal-transaction testing and recommends NRPP/NRSB certification. The exact state licensing terminology should receive legal/editorial verification before publication.
EPA radon-zone context
Missouri radon potential varies, but every home can differ. EPA and state maps are context, not an address-level test result.
Testing is the only way to know. EPA radon zones are broad planning tools. Never use a zone, county, ZIP, or map to predict the radon level of a specific home or to decide that testing is unnecessary.
Public radon professional listings in Missouri
Directory inclusion is not an endorsement or a guarantee. Confirm current services, credentials, insurance where appropriate, pricing, service area, and availability directly.
APEX Environmental Consultants Inc
Advanced Radon Control LLC
Air Sense Environmental
Testing · Mitigation
Alpha Radon KC, LLC
Mitigation
Atlas Technical Consultants
BT3 Inspections
Barnett Real Estate Inspections, LLC
Blackstone Consulting LLC
Boykin Home Inspections Inc
Buyers Protection Group
CW Inspections
Complete Inspection, LLC
Testing
Frequently asked questions
Should every home in Missouri be tested for radon?
Testing is the only way to know the radon level in a specific Missouri home. Maps, county averages, a neighbor's result, and foundation type cannot replace a properly conducted test.
What does a result of 4 pCi/L mean?
EPA recommends taking action to reduce radon at 4 pCi/L or higher and suggests considering action between 2 and 4 pCi/L. The action level is not a line between safe and unsafe; long-term risk generally increases as exposure increases.
How much does radon mitigation cost in Missouri?
Pricing varies by the home and the system design. RadonCostGuide uses broad planning estimates only; foundation type, crawlspaces, finished areas, suction points, electrical work, permits, diagnostics, and post-mitigation testing can all affect the final quote.
How do I find a radon professional in Missouri?
Start with the state radon program and the NRPP/NRSB directories where appropriate. Independently confirm current credentials, insurance, scope of work, permits, warranties, service area, and pricing before hiring.
Are free or low-cost radon test kits available in Missouri?
Missouri offers one short-term radon test kit per household at no cost while supplies last using the state's current ordering process. Verify the coupon/order workflow before launch.
Sources
Content reviewed 2026-08-22. Costs are planning estimates, not quotes or guarantees.