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Start Here: Radon Guides by Question

Updated November 1, 2026

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What does my radon result mean?

Understand radon and your result

• What Does My Radon Test Result Mean
  Enter your radon result in pCi/L or Bq/m³ and the test type. See what EPA guidance says to do next: retest, consider a fix, or fix. Not medical advice.
• What is radon?
  What it is, how it gets in, EPA's risk tables
• Radon higher in winter?
  Why winter readings run higher and when to test
• Do new homes have radon?
  New homes can have radon too: what to do
• Opening windows and radon
  A short-term drop, not a fix
• Basement vs first floor
  Which level to test, and what changes the answer
• Radon in a crawl space
  Where to test and how crawl space radon is fixed
• Radon in well water
  Test the air first, then the water; aeration vs carbon

Test your home

• Radon test kits
  Short-term vs long-term, and how to place the kit
• Radon Test Kit
  Which radon test kit to order, how to place it, and how to find a free or discounted kit first. Plain steps based on EPA guidance for homeowners.
• Digital detectors vs test kits
  How each works, why short readings mislead, how long to run one
• Radon test after mitigation
  When to test, who should run it, and how often

Fix a high reading

• Radon mitigation systems
  Sub-slab depressurization, fans and what to check after
• Radon mitigation cost
  State-sourced price ranges, running costs, how to compare quotes
• Find a certified radon contractor
  State programs, NRPP/NRSB, questions to ask, contract checklist

Buying or selling a home

• Radon in a home sale
  EPA steps for buyers and sellers, test options, who pays