2026-02-12 · 5 min read
Radon Mitigation Cost in Missouri (2026)
Northern Missouri has EPA Zone 1 radon risk; St. Louis and Kansas City metro areas frequently test above 4 pCi/L. Costs run $900–$2,300 for most homes.
Missouri Radon Risk
Missouri's radon picture depends on where you live. Northern Missouri — north of the Missouri River — sits in EPA Zone 1, the highest risk category. The glacial geology here produces the same high radon conditions as neighboring Iowa and Illinois.
St. Louis and Kansas City metro areas both see significant radon exposure. Older homes in St. Louis County and St. Charles County frequently test above 4 pCi/L. On the Kansas City side, Clay, Jackson, and Platte counties see elevated levels.
The Ozarks (south-central Missouri) is less studied but shouldn't be ignored. Granite and chert bedrock in areas like the Mark Twain National Forest region can produce elevated radon. Springfield and surrounding areas warrant testing.
Southern Missouri near the Arkansas border generally has lower risk.
What Mitigation Costs in Missouri
| Foundation Type | Typical Cost |
| Slab-on-grade | $900–$1,600 |
| Basement (unfinished) | $950–$1,800 |
| Basement (finished) | $1,200–$2,300 |
| Crawl space | $2,200–$5,500 |
| Multiple foundations | $1,800–$3,500 |
Regional Breakdown
St. Louis metro (St. Louis City, St. Louis County, St. Charles): Strong contractor market, competitive pricing. Standard basement: $950–$1,800. Many older brick homes in the region require more complex pipe routing — expect slightly higher quotes on pre-1970 homes.
Kansas City metro (Missouri side): Similar competitive dynamics to the Kansas side. Contractors serve both markets. Budget $950–$1,800 for a standard basement.
Columbia / Jefferson City: Mid-market pricing. Multiple certified contractors. Standard jobs: $1,000–$1,900.
Springfield / Joplin: Growing contractor market. Lower radon risk than northern MO but testing still warranted with basements. Pricing: $900–$1,700.
Rural Missouri: Limited contractor options outside metro areas. Travel fees common. Budget 15–20% above metro rates.
Missouri's Sump Pit Issue
Missouri basements frequently have sump pits — and sump pits are one of radon's favorite entry points. A properly installed mitigation system will seal the sump pit with a gas-proof cover as part of the installation. Make sure any quote includes sump pit sealing if your basement has one.
Missouri Resources
- Missouri Radon Program: 800-669-7236 or health.mo.gov/radon
- Verify NRPP: radonproficiency.org
- Verify NRSB: nrsb.org
Frequently Asked Questions
Does Missouri have high radon?
Yes, especially northern Missouri and the St. Louis and Kansas City metro areas. Northern Missouri counties are EPA Zone 1. The Ozarks in southern Missouri have variable radon — the granite and chert geology can produce elevated levels despite being less commonly discussed.
How much does radon mitigation cost in Missouri?
Most Missouri homeowners pay $900–$2,300 for a standard system. St. Louis has an excellent contractor market. Kansas City (Missouri side) also has strong competition. Rural Missouri sees 10–20% higher prices due to fewer contractors.
Does Missouri have a state radon program?
Yes. The Missouri Radon Program through the Department of Health and Senior Services offers resources and contractor lists. Visit health.mo.gov/radon or call 800-669-7236.
Is radon a problem in Missouri basements?
Absolutely. Most Missouri single-family homes have full or partial basements, and radon enters through foundation cracks, sump pits, and block walls. Getting your basement tested is the essential first step.
Find a Certified Mitigator Near You
Every contractor on RadonBase is NRPP or NRSB certified — mitigators only, no testers.
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