Key West, FL Radon Mitigation and Testing

Q: What EPA Radon Zone is Key West in?

Key West is in Monroe County, EPA Zone 3.

Q: How much does radon mitigation cost in Key West?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Monroe County

EPA Zone 3

At the southernmost point of Monroe County and the continental United States, Key West sits on coral limestone bedrock that generally produces minimal radon levels. The historic city features everything from 19th-century conch houses to modern resort developments, most built on elevated foundations. Though radon risk is typically lower in the Keys' coral geology, testing data remains limited for zip code 33040, making baseline testing still advisable for residents.

Key West, FL Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Key West, FL Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Key West Radon Facts

Key details about the radon risk profile for Key West and the 33040 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Monroe County, FL

Zip Code

33040

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Key West and the 33040 zip code are located in Monroe County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Key West, FL

What EPA Radon Zone is Key West in?

Key West and the 33040 zip code are in Monroe County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Key West?

Radon mitigation in Key West typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Key West?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Most Active Radon Markets in Florida

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Ocala	8.31 pCi/L	16
Gainesville	7.09 pCi/L	11
Naples	7.00 pCi/L	11
Lakeland	9.83 pCi/L	6
Bradenton	4.80 pCi/L	5
Alachua	11.50 pCi/L	4
Cape Coral	5.75 pCi/L	4
Miami	5.25 pCi/L	4
North Port	5.25 pCi/L	4
Venice	5.25 pCi/L	4
Tallahassee	4.75 pCi/L	4
Orlando	4.25 pCi/L	4
Valrico	8.33 pCi/L	3
Bonita Springs	6.67 pCi/L	3
Lithia	5.00 pCi/L	3
Sarasota	4.00 pCi/L	3
Estero	6.50 pCi/L	2
Boynton Beach	20.00 pCi/L	1
Fort Lauderdale	14.00 pCi/L	1
Miami Beach	10.00 pCi/L	1