Greenville · Greer · Simpsonville · Upstate SC
Radon Testing in Greenville, SC
Find out what you're breathing. Professional radon testing for homeowners, buyers and sellers across the Upstate, with clear results and an honest explanation of what they mean.
Schedule a Radon Test
Why test your Greenville home for radon?
You can't see, smell or taste radon, so a test is the only way to know whether your home has a problem. The U.S. EPA and the U.S. Surgeon General recommend testing all homes below the third floor. Radon is the leading cause of lung cancer among people who have never smoked, and the risk grows with the level and the length of time you're exposed.
Radon levels depend on the soil and rock under your house, your foundation, and how air moves through the home. That's why two similar houses on the same Simpsonville or Greer street can have very different results. Testing takes only a few days, and it answers the question for your house specifically.
Radon testing options
Professional continuous monitor
An electronic monitor records radon every hour, typically for at least 48 hours, and can detect tampering or unusual conditions. This is the usual choice for real estate transactions because results come back quickly and are well documented.
Short-term test kit
Charcoal or similar passive devices stay in place from 2 to 90 days, then go to a lab. They're an affordable first screen. Follow the instructions closely, because placement and closed-house conditions affect accuracy.
Long-term test
Devices left in place for more than 90 days show your home's average across seasons. EPA notes a long-term test gives a better picture of year-round exposure than a short-term test.
How a professional radon test works
- Book a time. Call or use the form. Tell us whether it's for your own peace of mind or for a home sale, and your deadline.
- Closed-house conditions. Keep windows and outside doors closed, except for normal coming and going, starting 12 hours before the test. Don't run whole-house fans that bring in outside air.
- Monitor placement. The monitor is set in the lowest livable level, out of drafts and away from humidity sources.
- Results explained. After the test period you get your average in pCi/L and what it means under EPA guidance.
- Next steps if needed. At 4 pCi/L or above, we'll talk through confirming the result and your radon mitigation options in Greenville, or read how mitigation systems work.
Understanding your radon results
- Below 2 pCi/L: Low. EPA still suggests retesting periodically, and after major renovations or changes to your heating and cooling system.
- 2 to 3.9 pCi/L: EPA suggests considering mitigation, since any radon exposure carries some risk.
- 4 pCi/L or higher: EPA's action level. Confirm with a follow-up test and plan to fix your home.
Radon naturally rises and falls with weather and season, so a single short-term number is a snapshot. If a decision depends on it, a second test or a long-term test gives you more confidence.
Radon testing for real estate
Many Upstate buyers now ask for a radon test during the inspection period. A professional continuous-monitor test gives buyers, sellers and agents a documented result within the inspection window. If the number comes back high, mitigation is a common, straightforward repair that can be quoted and scheduled before closing.
Where we test
- Greenville
- Greer
- Simpsonville
- Mauldin
- Taylors
- Travelers Rest
- Easley
- Fountain Inn
- Five Forks
- Spartanburg
- Anderson
- the wider Upstate
Radon testing FAQs
How much does radon testing cost in Greenville?
Do-it-yourself test kits are inexpensive and sold at hardware stores and online. Professional testing with a continuous radon monitor costs more but gives hour-by-hour data and is often preferred for real estate transactions. Call for current pricing on a professional test. For mitigation pricing, see typical radon mitigation costs in Upstate SC.
How long does a radon test take?
Short-term tests run from 2 to 90 days; most professional real-estate tests run at least 48 hours. Long-term tests run more than 90 days and give a better picture of your year-round average.
What is a normal radon level?
EPA estimates the average indoor radon level in U.S. homes is about 1.3 pCi/L, and the average outdoor level about 0.4 pCi/L. EPA recommends fixing a home at 4 pCi/L or higher and considering it between 2 and 4 pCi/L.
Where in the house should the test go?
In the lowest level of the home that is used or could be used as living space, at least 20 inches off the floor, away from drafts, exterior walls, kitchens, bathrooms and sump pits. Keep windows and exterior doors closed (normal entry and exit is fine) for 12 hours before and during a short-term test.
My neighbor tested low. Do I still need to test?
Yes. Radon levels can be very different from one house to the next, even on the same street, because they depend on soil, foundation and how the house is built and used. Testing is the only way to know your own level.
Is a radon test part of a standard home inspection in South Carolina?
Not automatically. Radon testing is usually an add-on you request, so ask for it when you schedule your inspection. Buyer and seller tips.
Do new homes need radon testing?
Yes. EPA recommends testing all homes, new and old, with or without basements. New homes can also be built with radon-resistant features, which still should be tested to confirm.
What happens if my result is high?
If a short-term test is 4 pCi/L or higher, EPA suggests a follow-up test (either another short-term or a long-term test) to confirm, unless you're in a real estate transaction where a timely decision is needed. If the result is confirmed, the next step is a radon mitigation system.
Find out your home's radon level
Call for a free, no-pressure quote anywhere in Greenville County and the Upstate.
Call (864) 555-0100