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Why (and How to) Test Your House for Radon

Posted on January 21, 2025   |   Updated on September 30, 2025
Adrian González

Adrian González

Contractor reaches up to a PVC pipe inside a home.

Keep your home safe by testing for radon. (Alex Potemkin / Getty)

You can’t see it, smell it, or taste it, but it can be deadly. Radon is the leading cause of lung cancer among non-smokers in the country and is responsible for 500 deaths annually in Colorado. To raise awareness, the Denver Department of Public Health and Environment is giving away free radon test kits this week. Here’s what you need to know and how to nab your free kit.

What Is Radon?

It is a naturally occurring radioactive gas resulting from the breakdown of uranium in the soil that makes its way into the atmosphere. It’s considered harmless at low levels, but can be dangerous when it enters a home. Nearly half of Colorado homes contain radon levels higher than the amount designated as safe by the Environmental Protection Agency.

How to Test Your Home for Radon

Experts recommend testing your home for radon every two to three years. The Colorado Department of Public Health and Environment offers instructional videos, educational resources, and other radon FAQs to help.

If you’ve already used your free test kit, or would rather contact a professional, you can hire a contractor to come test your home. There are options from the National Radon Proficiency Program and the National Radon Safety Board.

Are you renting your home? You should bookmark the EPA’s radon guide for renters. Landlords are required to include radon disclosure in lease agreements and make reasonable efforts to mitigate elevated radon levels within 180 days, otherwise a lease can be voided.

Where to Get Your Free Radon Test Kit

DDPHE is offering free radon test kits this week. You can pick one up at any of the giveaway events listed below 👇

  • Tuesday, Jan 21 | 11 a.m.-3 p.m. | DPL Bear Valley Branch
  • Wednesday, Jan 22 | 11 a.m.-3 p.m. | DPL Montbello Branch
  • Thursday, Jan 23 | 11 a.m.-3 p.m. | DPL Hampden Branch
  • Friday, Jan 24 | 11 a.m.-3 p.m. | DPL Rodolfo “Corky” Gonzales Branch

Or, you can fill out this online form from the state to have a free radon test kit shipped to you while supplies last.

Miss out on the freebies? The state also offers some additional resources for low-cost test kits, as well as a low-income radon mitigation assistance program.

see more:public health

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