Radon testing
Professional short-term testing, from about $150 as a typical estimate. A good first step before any system.
About radon testingRadon Mitigation in Greenville, SC
Greenville County is the only county in South Carolina the EPA places in Zone 1, its highest radon-potential group. We test homes across the city and install systems that vent radon outdoors before it builds up inside.
Get a Free Quote Call (727) 300-6656Greenville sits in South Carolina's only Zone 1 county
The EPA sorts every county into three radon zones. Of South Carolina's 46 counties, 37 are Zone 3, eight are Zone 2, and exactly one is Zone 1: Greenville County. That label is about predicted indoor levels, and the testing data backs it up.
South Carolina's radon program tallied 5,220 initial home tests from Greenville County through June 2022. The average result was 3.4 pCi/L, and the single highest reading was 126.6 pCi/L. For context, the EPA puts the average American home at about 1.3 pCi/L. The EPA recommends fixing a home at 4 pCi/L or above and suggests considering a fix between 2 and 4.
An average is not a forecast for your house, though. Two homes on the same Greenville street can test very differently, which is why the EPA says to test every home regardless of zone. The EPA also estimates radon is the leading cause of lung cancer among non-smokers. A test is the only way to know where you stand. Read more in our guide to what Zone 1 means for Greenville County.
Homes in Greenville: from Cleveland Park to new construction
Greenville has grown from about 70,700 residents in 2020 to an estimated 75,300, and its housing is as varied as its neighborhoods. Downtown, the West End, the Village of West Greenville, Cleveland Park and Southernside each mix older houses with newer infill. Many Upstate homes sit on crawl spaces or slabs, and older homes may have basements.
Foundation type drives the fix. Slab and basement homes usually get sub-slab depressurization, a sealed pipe and quiet fan that pull soil gas from under the floor. Crawl space homes usually get a sealed plastic membrane with suction beneath it.
Only about 41% of Greenville homes are owner-occupied, so we also hear from landlords and tenants. With a median home value near $487,500, radon also comes up often during sales. Greenville County is the only SC county whose residential code calls for radon-control methods in new homes, so a newer house may already have a passive pipe that just needs a fan.
Radon services for Greenville homeowners
Every job starts with a clear written quote and ends with a follow-up radon test to confirm levels dropped.
Sub-slab depressurization
The standard fix for slab and basement homes. Typical range $900–$2,500.
How sub-slab systems workCrawl space radon mitigation
Sealed membrane plus suction for crawl space homes. Typical range $1,500–$3,500.
Crawl space optionsNew construction radon
Activating or checking the radon-control pipe in a newer Greenville County home.
New-home radon helpGet a free radon quote in Greenville
Tell us about your home and any test results. We usually reply the same day, and every price is confirmed after an on-site look. See typical costs first if you like.
Greenville radon questions
Is radon really a problem in Greenville, SC?
It can be. Greenville County is the only EPA Zone 1 county in South Carolina, and state program data shows an average initial test of 3.4 pCi/L across 5,220 county homes, with one reading as high as 126.6. Plenty of homes test low, too. The only way to know about your house is to test it.
I rent my home in Greenville. Can I still test?
Yes. A short-term test is simple and doesn't change the home. South Carolina's radon program offers one free test kit per home while supplies last, or you can hire a professional test. If results come back high, share them with your landlord, since installing a mitigation system is a decision for the property owner.
My newer Greenville home has a radon pipe. Is that enough?
Not always. Greenville County's code calls for radon-control methods in new homes, which often means a passive vent pipe. Passive systems can help, but they don't always bring levels under 4 pCi/L. Test the home first. If levels are elevated, adding a fan to the existing pipe is often a straightforward upgrade.
Know your number. Fix it if it's high.
Free radon mitigation quotes across the Upstate — usually a same-day reply.