Fix It For Good

Mitigation Resources

Elevated radon is fixable. A professionally installed mitigation system can reduce indoor radon by up to 99%. Here's how to find a certified contractor, what it costs, and what to expect.

Up to 99%

Radon reduction possible

$800–$2,500

Typical system cost

3–5 hrs

Installation time

10–20 yrs

System lifespan

Your Options

Mitigation Methods

Most Common

Sub-Slab Depressurization

Effectiveness

Up to 99% reduction

Typical Cost

$800–$2,500

Best For

Homes with concrete slab or basement foundations

A pipe is inserted through the foundation slab and connected to a fan that draws radon from beneath the home and vents it outside above the roofline. This is the EPA's preferred method and works in the vast majority of homes.

How It Works

1Contractor drills one or more holes through the foundation slab
2PVC pipe is inserted and routed to the exterior or through the home
3A continuously running fan creates negative pressure below the slab
4Radon is drawn out before it can enter the living space
5A system diagnostic gauge confirms the fan is operating

Suitable For

✓Basement homes
✓Slab-on-grade homes
✓Crawl space homes (with modification)
✓Most new construction

Find a Certified Contractor

Know What You're Paying For

Cost Breakdown

Item	Low Estimate	High Estimate	Notes
Initial assessment / diagnostic	$0	$200	Often included in installation quote
Sub-slab depressurization (SSD) system	$800	$2,500	Most common — includes fan, pipe, labor
Additional suction points	$200	$500	Per additional pipe if needed
Interior pipe routing (finished basement)	$300	$700	If pipe must run through living space
Post-mitigation radon test	$15	$150	DIY kit or professional confirmation test
Annual fan electricity cost	$25	$75	Fan runs 24/7 at ~20–90 watts
Typical Total (System + Test)	$800	$2,700	Most homeowners pay $1,200–$1,500

Costs vary by region, home size, foundation type, and contractor. Always get 2–3 quotes. Some states offer financial assistance — check your state radon program.

The Full Process

What to Expect

Before Installation

Get 2–3 quotes from certified contractors
Confirm contractor is NRPP or NRSB certified
Ask for a written scope of work and warranty
Ensure your radon test result is confirmed (retest if needed)
Clear access to the basement or crawl space

During Installation

Installation typically takes 3–5 hours
Contractor drills through slab and routes pipe
Fan is mounted in garage, attic, or exterior
System diagnostic gauge is installed
You can remain in the home during installation

After Installation

Test radon levels 24–48 hours after installation
Levels should drop significantly within hours
Check the system diagnostic gauge monthly
Retest every 2 years to confirm continued effectiveness
Fan replacement may be needed after 10–20 years

Certified Professionals Only

Find a Certified Mitigator

Always use a contractor certified by NRPP or NRSB. Certification ensures proper training, equipment, and adherence to EPA guidelines.

NRPP

National Radon Proficiency Program

The most widely recognized certification body for radon measurement and mitigation professionals in the US.

Find Contractors

NRSB

National Radon Safety Board

Certifies radon measurement and mitigation professionals. Accepted by most states and real estate transactions.

Find Contractors

EPA

EPA Contractor Finder

The EPA's official tool to find certified radon measurement and mitigation professionals in your area.

Find Contractors

State Program

State Radon Programs

Many states maintain their own lists of certified contractors and may offer financial assistance programs.

Find Contractors

Contractor Red Flags

Walk Away If You See These Warning Signs

✗No written quote or contract

✗Not certified by NRPP or NRSB

✗Guarantees a specific radon level without testing

✗Recommends sealing alone as a complete fix

✗No post-installation test included or recommended

✗Unusually low price with vague scope of work

✗Pressure to decide immediately

✗No diagnostic gauge installed with the system

Questions to Ask Your Contractor

Are you certified by NRPP or NRSB? Can I see your certification number?

How many mitigation systems have you installed in homes like mine?

What type of system do you recommend and why?

Will you include a post-installation radon test?

What warranty do you offer on the system and your labor?

What happens if the system doesn't reduce levels below 4 pCi/L?

Will you install a system diagnostic gauge so I can monitor fan operation?

Are there any permits required and will you handle them?

Testing Guide

Not sure if you need mitigation? Start with a test.

View Page →

Risk by State

See your state's EPA radon zone and average levels.

View Page →

FAQ

More questions about radon, testing, and mitigation.

View Page →

High Radon Is Fixable.

A one-time investment of $800–$2,500 can eliminate up to 99% of your home's radon — permanently.

Find a Certified Mitigator