Radon Mitigation Cost in Colorado and Larimer County

Colorado figures

These are the numbers to start with. Each comes from a Colorado agency.

Why these numbers don't line up

• CDPHE disagrees with itself. Its two pages give different ranges, and neither carries a date.
• The program average sits inside the Colorado ranges above, but well above the $1,200 state-report average and the national averages below. The $1,892 figure comes from a specific low-income program, not market quotes, so read it as real job data with that limit. It's still the only Colorado figure here based on a counted set of actual homes.
• The county cites the state. Two of Larimer's figures credit CDPHE, so seeing a number twice doesn't make it two sources.

Nothing here tells you what a contractor will charge for your house. No source gives a price specific to Fort Collins or any other town here.

National figures, labeled

National cost sites run lower than Colorado's agency figures. Don't blend the two. These are national numbers from commercial sites, not local quotes.

HomeAdvisor's 2025 figures by type are $1,000 to $3,000 for active suction and $500 to $2,500 for passive. Bob Vila gives $800 to $3,000 for a crawlspace system. EPA itself gives no dollars. It says the cost is "about the same cost as other common home repairs."

Two other jobs are priced very differently. Crawlspace encapsulation runs $1,500 to $15,000 (HomeAdvisor 2025; Angi 2022), and basement sealing about $4,600 (Angi; Bob Vila, 2022). Neither is a radon fix by itself. See the crawlspace guide.

What moves the price on a given house

The published drivers are these:

• Foundation type. Basement, slab and crawlspace jobs involve different work. See the basement, slab and crawlspace guides.
• Home size and layout. Bob Vila names both.
• Difficult design problems. CDPHE's phrase, and it's the reason its range is qualified. Ask if your house has any.

That's why a price comes from a look at the house. Ask what the quote includes, whether permits and electrical work are in it, and what a replacement fan would cost. EPA says "Fans may last for five years or more," and no source gives a sound local replacement price.

Testing costs are separate. See the kit table for what kits cost. A professional test is about $150 by CDPHE's FAQ, with higher national figures from Bob Vila ($150 to $800). LawnStarter's 2024 national guide lists professional short-term testing at $185 and long-term at $190, and a much higher $310 to $1,420 range that appears to include other work.

Help paying: Low Income Radon Mitigation Assistance

Colorado runs this program through CDPHE. You apply with the state directly; a request on this site doesn't connect to it, and the program uses its own contractor process.

• Who it's for. Colorado residents, in their primary residence, in a low-income household, according to the City of Fort Collins and CDPHE. A Garfield County notice (Jan 30, 2019) says low-income households whose homes test above 4 pCi/L "may be eligible for a free radon mitigation system."
• What the county's page lists. Larimer County's page lists coverage of up to 100% of installation, and a limit of up to $104,300 for a four-person household. Other household sizes weren't found.
• How to apply. Use the online homeowner application, in English or Spanish. CDPHE says "you will receive an email confirmation."
• Whether it's open. CDPHE's page doesn't state its status, so check with CDPHE on current openings at 303-692-2000, its general line.

Larimer County's page also says some HSA or FSA plans may pay for mitigation. Ask your plan.

Worked example: what the fan costs to run

EPA says a system "will slightly increase your electric bill," and that the fan "must run continuously." Here's a calculated estimate for one utility, with every assumption shown.

• Rates: Fort Collins Utilities 2026 standard time-of-day: 32.30¢ summer on-peak, 29.78¢ non-summer on-peak, 8.98¢ off-peak.
• Hours: 8,760 a year, of which about 546 are summer on-peak and about 606 non-summer on-peak (weekdays only, holidays ignored). The other 7,608 are off-peak.
• Blended rate: about 11.87¢ per kWh.
• Left out: the 700 kWh tier charge, the base charge and any lost heated air.

As a check, Minnesota's health department (Sept 13, 2023) works a 20 watt fan at 11¢ per kWh: "about $19.27 per year." A 7.0% Fort Collins rate increase for 2027 was proposed as of this check. Loveland, Xcel and co-op customers pay differently, and this isn't your bill. EPA also says a system can "cause some loss of heated or air conditioned air," with no dollar figure.

What goes wrong with pricing

• A price with no scope. EPA's contract list includes total cost, time needed, permits, and a question about a guarantee: "A guarantee to reduce radon levels to 4 pCi/L or below?" Get those in writing.
• Paying for a job that isn't a radon fix. Sealing alone or encapsulation alone won't do what a system does. See above.
• Expecting the national average. Colorado agency figures run higher.

Who this page isn't for

If you haven't tested, a kit is the next step and not a system quote. See the testing guide. If you qualify for state assistance, go to CDPHE first.

Before you sign

A written price only helps if it says what's included. The hiring guide lists what the contract should cover.

Questions homeowners ask

What should a system cost in Fort Collins?

There's no sourced Fort Collins price. Colorado ranges are above, and your contractor's written quote is the number that counts.

Is a price over the ranges above a bad sign?

Not by itself. The state program's own range reached $5,800. Ask what makes the design difficult and have it written down.

Does the state ever pay for it?

The low-income program can, for eligible households. Check openings with CDPHE.

What will it add to my power bill?

On Fort Collins Utilities rates, about $21 to $74 a year in the examples above. Your fan size and utility change that.

What does adding a fan to my passive pipe cost?

CDPHE says about $500. See the passive systems guide.

How this site helps

LarimerRadon.com is a referral service: a request here goes to one independent local contractor, who quotes and does any work directly with you.

Sources

• CDPHE, testing page, FAQ and low-income assistance (© 2026, undated); program decks of Apr 20, 2023 and Apr 24, 2024.
• Colorado Department of Regulatory Agencies, radon report (Oct 15, 2026).
• Larimer County, health page (Nov 1, 2026), Extension page (Aug 29, 2025), presentation (undated). City of Fort Collins, radon page and rates (2026).
• EPA, Consumer's Guide to Radon Reduction.
• Minnesota Department of Health, energy costs (Sept 13, 2023). Fan spec sheet (2008, on file with New York State).
• National, commercial: HomeAdvisor, Angi, This Old House, LawnStarter, Bob Vila, with dates as shown above.

Related guides

• Radon mitigation
• Passive systems
• Hiring guide
• Fort Collins