Florida — 6.2M metro

Radon in Miami,
FL

Florida is one of the nation's lowest-radon states, and Miami is among the lowest-risk major metros in the US. Florida Department of Health data shows the vast majority of homes well below 2 pCi/L — far under the EPA action threshold.

Risk Level

Low Risk

0.3–1 pCi/L

Typical range (area avg.)

EPA action level: 4 pCi/L

Why Miami Has Low Risk Radon

South Florida sits on porous Oolitic limestone (Miami Limestone Formation) with extremely low uranium content. The limestone's water-saturated nature near sea level essentially prevents radon migration from rock to overlying soils and structures.

Local Housing and Radon Risk

Miami and South Florida's construction is virtually all slab-on-grade with no basements — sea level and water table make basements impractical. This construction style essentially eliminates the primary radon entry pathway seen in higher-risk regions.

Testing Advice for Miami Residents

Radon testing is still recommended even in South Florida — EPA advises all homeowners to test at least once. In Florida's case, testing primarily confirms what's already expected: low levels. However, homes in northern Florida (Tallahassee area) have measurably higher risk.

How to Test Your Miami Home

Step 1: Choose Your Test Type

For initial screening, a charcoal short-term test kit ($12–$25) placed for 48–96 hours provides a quick result. For the most accurate reading, a long-term alpha-track test ($20–$35) left in place for 90+ days accounts for seasonal variation — especially important in Miami's climate.

Step 2: Place the Test Correctly

Test in your lowest livable level — basement if you have one, otherwise the first floor. Keep the test 20 inches from the floor, away from windows and exterior walls. Close windows and doors 12 hours before and during the test for accurate results.

Step 3: Interpret Your Results

Below 2 pCi/L: low concern, retest every 2 years. 2–4 pCi/L: consider mitigation, retest in 2 years. 4 pCi/L or higher: the EPA recommends mitigation. Above 8 pCi/L: prioritize mitigation promptly.

Step 4: Hire a Certified Mitigator if Needed

If your test result is at or above 4 pCi/L, hire a certified radon mitigator. In Florida, always verify your contractor's state certification. Sub-slab depressurization — the most effective mitigation method — typically costs $800–$1,400 installed (rarely needed) in the Miami area.

Frequently Asked Questions — Radon in Miami

Is radon a real problem in Miami?

Yes. Florida is one of the nation's lowest-radon states, and Miami is among the lowest-risk major metros in the US. Florida Department of Health data shows the vast majority of homes well below 2 pCi/L — far under the EPA action threshold. The EPA recommends all homes be tested regardless of location — radon levels can vary significantly even between neighboring properties.

How much does radon mitigation cost in this area?

In the Miami area, professional radon mitigation (sub-slab depressurization) typically costs $800–$1,400 installed (rarely needed). This is a one-time cost that reduces radon by 50–99%. The system requires minimal maintenance and a mitigator can typically complete the work in 3–5 hours.

Should I test if I have a new home?

Absolutely. New homes built with radon-resistant features still show elevated levels in testing — construction conditions and local geology vary too much to assume any home is safe. Test within the first year of occupancy, especially if your home has a basement.

Can I test radon myself, or do I need a professional?

DIY testing is reliable and recommended as a first step. Short-term kits ($12–$25) and long-term kits ($20–$35) are accurate when placed and returned correctly. Professional testing is only required for real estate transactions in some states. If your DIY test shows elevated levels, use a certified professional for both confirmation testing and mitigation.