
Radon Mitigation in Longmont, CO
Licensed radon mitigation for Longmont homes: free estimates, written prices and a follow-up test that proves the system works.
Radon is a colorless, odorless radioactive gas that comes up out of Colorado's soil and rock and collects inside homes, most of all in basements, crawl spaces and rooms built on a slab. You can't smell it or see it, and your neighbor's result doesn't tell you anything about your house.
Boulder County is rated EPA Zone 1, the highest radon zone, which means the average home here is predicted to test above the EPA's action level of 4.0 pCi/L. Radon is the leading cause of lung cancer among people who have never smoked.
The good news is that the fix is well understood. A radon mitigation system pulls soil gas from under your foundation and vents it above the roofline before it can get inside. Most systems are installed in a day, and a well-designed system usually brings a home well under the action level. Call (720) 790-3231 or request a free estimate.

Radon Mitigation Longmont Co. does one thing: radon. We test, we design and install radon mitigation systems, and we repair and upgrade the systems already in Longmont homes.
Colorado has required radon mitigation professionals to hold a state license since July 1, 2022, and every system we install is done to that standard. You get a written price before any drilling, a clean install that doesn't change how your home looks, and a post-mitigation test that shows the result.
More about usEvery house meets the ground a little differently. These are the radon services Longmont homeowners ask about most.
Short-term and long-term radon testing to find out where your Longmont home stands before you decide anything.
Learn more →The standard radon mitigation system for Longmont basements and slab homes, vented safely above the roofline.
Learn more →Sealed membranes and sub-membrane suction for crawl spaces, older homes and mixed foundations.
Learn more →Noisy, dead or alarming radon fan? Replacement, repair and system checks for existing Longmont systems.
Learn more →Fast radon fixes when a buyer's inspection comes back high, timed to your closing date.
Learn more →We're based around Longmont and serve the nearby towns in Boulder County and southwest Weld County, from Lyons and Hygiene in the foothills to Firestone, Frederick and Dacono along I-25.
See all service areasRadon isn't a side job for us. Testing, system design, installs and repairs are all we do.
You get a clear, written estimate before any work starts, so there are no surprises on install day.
Every new system is followed by a post-mitigation test that documents your new radon level.
We route pipe outside, through the garage or up through the attic and place the fan where you won't hear it.
Yes. Boulder County is EPA Zone 1, the highest radon zone, so the average home here is predicted to test above 4.0 pCi/L. The only way to know your home's level is to test.
A standard sub-slab system for a basement or slab home commonly runs about $1,300 to $2,500 on the Front Range. Crawl spaces and mixed foundations cost more. We give you a written price before any work starts.
Most standard systems are installed in a single day. Crawl spaces and homes with more than one foundation type can take longer.
The City of Longmont lists free options: borrow a radon detector from the Longmont Public Library, order a free mail-in kit from the State of Colorado, or book a free Longmont Sustainable Home visit. Short-term kits are also sold at the CSU Extension office on Nelson Road.
Winter. Doors and windows stay closed, so readings reflect the worst case. Longmont recommends retesting every few years, even if you already have a radon fan.
Call (720) 790-3231 or request your free radon mitigation estimate in Longmont.
Free — no obligations