The homeowner’s reference
Radon testing and maintenance guides
What to ask before a test, what to keep after an installation, and when to check again.
Original research · Pennsylvania
19 Pennsylvania counties have testing entries but no local mitigation entry
Four DEP reports from September 2026, compared across 67 counties. Where testing and mitigation entries appear, and what those counts do not mean.
Original research · Minnesota
47 Minnesota cities list a licensed tester and no licensed mitigator
The Minnesota Department of Health license search, pulled September 28, 2026. Where measurement and mitigation licenses list an address, and what those listings do not mean.
How long does a radon test take? 5 things to know before booking
Plan a radon test around the device's testing period, preparation and report turnaround. Five checks before booking a tester or using a kit.
Certified radon tester: what they do and how to hire one
What a certified radon tester does, how to check a state license or an NRPP or NRSB certification, and what to confirm before you book.
Radon system maintenance: 7 checks for homeowners
Seven checks for an existing radon system: warning devices, power, visible damage, test results and records. Learn what a pressure gauge can tell you.
How to choose a radon mitigation company: 6 checks before you sign
Verify the mitigation credential, compare two written proposals, read the contract and plan an independent test. Six checks from EPA and NRSB.
Radon mitigation cost: official figures and what changes the quote
EPA's 2025 analysis uses $1,826 per radon mitigation system. State health departments cite $1,000 to $3,000. See what changes your quote.
How often should you test for radon? 5 situations to consider
When to test or retest for radon: an unknown history, buying a home, renovations, more basement use and an existing mitigation system.
Radon test kits and monitors: how the three types compare
Short-term kits, long-term kits and digital monitors measure radon differently. Compare how long each takes, what the result means and where to get one.
Ready to arrange a test or discuss mitigation? Browse providers by state, city or county and check their credential against the official source.