If you just got a radon test result back and you're staring at a number above 4 pCi/L, the first question is almost always about money. Here's what actually drives radon mitigation cost in Colorado, based on EPA guidance and how installations typically work in Arvada and Jefferson County homes.
How much does radon mitigation cost in Colorado?
Nationally, EPA's A Citizen's Guide to Radon puts typical radon reduction system costs between roughly $800 and $2,500, with many homes landing near the middle of that range. Colorado pricing follows the same pattern, since the equipment, labor, and permitting involved don't differ dramatically by state.
What changes the number for a specific house is foundation type, crawlspace access, and how many suction points a system needs to pull radon-laden soil gas out from under the slab. A simple single-point system in a home with a clean, accessible basement slab sits at the lower end. A home with a mixed foundation -- part basement, part crawlspace, part slab-on-grade, which is common in older Arvada and Jefferson County neighborhoods -- often needs multiple suction points and costs more.
What factors affect the price of a radon mitigation system?
Price is driven mainly by foundation complexity, fan size, pipe routing, and any sealing work needed at sump pits or slab penetrations -- not by the radon number itself. A house testing at 6 pCi/L and one testing at 20 pCi/L can require the identical system, since both exceed EPA's action level of 4 pCi/L.
- Foundation type: basements and poured slabs are generally more straightforward than crawlspaces or homes with multiple foundation types under one roofline.
- Number of suction points: larger footprints or homes with interior footings sometimes need a second or third pipe run to depressurize the whole slab evenly.
- Sump pit sealing: if the home has a sump pit, it usually becomes part of the suction point and needs an airtight lid -- this is standard, not an upsell.
- Exterior routing: where the discharge pipe can run and exit above the roofline affects labor time, especially on multi-story homes.
Get quotes from licensed operators in our network after a real inspection rather than a phone estimate -- foundation layout matters more than square footage alone.
Does Colorado require a license to install a radon mitigation system?
Colorado does not run a separate state contractor license specifically for radon mitigation, but the Colorado Department of Public Health and Environment (CDPHE) directs homeowners to hire professionals certified through the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). Always ask for that certification number before work starts.
This matters because an improperly installed system -- wrong fan sizing, a suction point in the wrong spot, or an unsealed sump lid -- can leave radon levels barely changed even though a fan is running and the electric bill went up. CDPHE's role is largely informational and coordinating the state radon program rather than issuing its own contractor licenses, so certification credentials are your main verification tool.
How do I get a radon test in Arvada or Jefferson County?
Short-term charcoal or electronic test kits measure radon over 2-7 days under closed-house conditions, meaning windows and exterior doors stay shut except for normal entry and exit. EPA recommends closed-house conditions for at least 12 hours before and during the test for an accurate reading, and testing during colder months tends to produce more consistent results since homes are naturally sealed up for heat.
Homes throughout Jefferson County -- including the Arvada area -- sit in a region EPA's Map of Radon Zones classifies as Zone 1, its highest potential category, which is why testing is worth doing regardless of a home's age or foundation type. A positive short-term test above 4 pCi/L is typically followed by either a second short-term test or a long-term test (90+ days) to confirm before scheduling mitigation.
What does a typical active soil depressurization system include?
An active soil depressurization (ASD) system uses a PVC pipe run from below the slab, through the house or along an exterior wall, up to a fan mounted in the attic or outside, then venting above the roofline. A small U-tube manometer gauge is mounted on the visible pipe section so the homeowner can see at a glance whether the fan is still running.
That manometer detail is easy to overlook but it's the main way anyone -- homeowner or future home inspector -- confirms the system is actually working years later without opening walls or retesting immediately. For a deeper look at how these systems are engineered for Arvada foundations specifically, see our guide on active soil depressurization systems in Arvada. If you're still deciding whether your reading warrants action, our piece on average radon levels across Colorado breaks down how to read a test report.
This article is for general education and does not replace a site-specific inspection or the guidance of a certified radon professional. Regulations, certification requirements, and permitting rules can vary by municipality and change over time -- confirm current requirements with CDPHE or your local building department before scheduling work.