Test results
What your radon test result means
Radon results are reported in picocuries per liter (pCi/L). Enter your number in the checker, or read below for what each range means and what to do next.
$800–$1,200 typical system in PA
Pennsylvania DEP's range. Free quote, no obligation, from an installer certified by the PA Department of Environmental Protection.
What does your test result mean?
Enter the radon level from your test report.
General guidance from the EPA and Pennsylvania DEP, not a substitute for a certified professional's assessment.
4.0 pCi/L or higher: plan a fix
This is the EPA action level. Pennsylvania DEP recommends a radon reduction system at or above it. If your first result came from a short-term test and you aren't in a hurry, the EPA suggests a follow-up test to confirm it, either a second short-term test or a long-term test. If you're buying or selling a home, one short-term result is often what the sale goes by.
2.0 to 3.9 pCi/L: worth considering
The EPA suggests considering a fix in this range, since no radon level is completely safe. A long-term test, which runs more than 90 days, gives a better picture of your home's year-round average.
Below 2.0 pCi/L: low
No system is recommended. Levels change, so DEP recommends retesting about every two years. Health officials also advise testing again after a major renovation, such as finishing a basement.
Why results can bounce around
- Weather and season. Radon is often higher in colder months, when the house is closed up.
- Test placement. Results should come from the lowest lived-in level, at least 20 inches off the floor, away from drafts and outside walls.
- Short vs. long tests. A 2- to 7-day test is a snapshot. A test of more than 90 days shows the average.
What a fix usually does
The EPA says radon levels in most homes can be reduced to 2 pCi/L or below. Pennsylvania DEP puts a typical system at $800 to $1,200.
Sources: U.S. EPA radon guidance · PA DEP, January 2026
Who you'll talk to
An independent referral to a certified installer
Butler County Radon Help is a referral service, not an installer. When you request a quote, we connect you with a radon mitigation company certified by the Pennsylvania Department of Environmental Protection that serves Butler County. The quote is free, and you're never obligated to hire anyone.
Check any company yourself
Look it up in the PA DEP radon services directory, or call DEP at 1-800-23-RADON.
Service area
Serving all of Butler County
- Butler
- Cranberry Township
- Zelienople
- Harmony
- Evans City
- Mars
- Valencia
- Seven Fields
- Saxonburg
- Slippery Rock
- Chicora
- Prospect
- Adams Township
- Jackson Township
- Center Township
- Penn Township
Good to know
Your radon questions, answered.
Straight answers from EPA and Pennsylvania DEP guidance.
More guides: What your test result means · How to test for radon · Radon mitigation cost · Buying or selling a home · Radon in new homes
Is 4.0 pCi/L dangerous?
4.0 pCi/L is the EPA action level, where a fix is recommended. Radon is the second leading cause of lung cancer in the U.S., and risk rises with the level and how long you're exposed.
Should I retest before installing a system?
If you have time, the EPA suggests a follow-up test to confirm a short-term result. In a home sale, one short-term test is often used.
My neighbor's result was low. Is mine?
Not necessarily. Radon levels can be very different between houses on the same street. Only a test of your own home tells you.
What if my result is in working levels (WL)?
The EPA's action level in working levels is 0.02 WL, the counterpart of 4.0 pCi/L. Ask the lab or tester if you're unsure how to read your report.
Free quote
Ready to lower your radon?
Tell us a little about your home, and we'll connect you with a DEP-certified installer serving Butler County.
- No cost to request a quote
- Shared with one certified installer, not sold to a list
- Mention a closing date and it's flagged as urgent