Questions we hear in Johnson City and the Tri-Cities
Same answers as the homepage. Zone maps, kits, credentials, cost, and how long a system takes. If the test already came back high, or you are buying in Zone 1, use the guides below.
Is Washington County really a high-radon county?+-
Highest predicted average radon potential for the county area, typically described as averages above 4 pCi/L. It is not your home's result. Sullivan County is Zone 1 too. Carter and Unicoi next door are Zone 2. Test the house.
Can I just use the free TDEC kit?+-
Yes, if you already live there and you want a first look. Order from the Tennessee Radon Program, run it 3 to 5 days, and mail it back immediately. If you're buying or selling, use a professional continuous test so the other side has a time-stamped report.
Does Tennessee license radon testers?+-
No. Tennessee does not issue a state radon measurement or mitigation license. TDEC points people to national credentials: NRPP and NRSB. Ask us for our certification ID and look it up on the directory. We do not print a number on this site because listings go stale.
What's the EPA action level?+-
4 pCi/L. EPA also says think about fixing between 2 and 4. We treat 3.8 and 4.2 as the same conversation. A 12 is a different one. We will not invent a number from your zip code.
Do crawl-space houses need a different system?+-
Usually yes. A dirt crawl gets a sealed membrane and a fan pulling from under the plastic. A basement or slab gets a pipe through the concrete. Hillside houses that have both often need both. A box fan in a foundation vent is not a system.
Should I test well water?+-
Test the air first. If you're on a private well or spring, especially in northern Washington County, a water sample can be a second step. City water in Johnson City, Jonesborough, Kingsport, or Bristol is not the usual indoor-radon driver. We will not guess a water number from a geology paper.
How fast can you test a house under contract?+-
A continuous monitor usually needs a closed house and about 48 hours on site, plus scheduling. Tell us the inspection window in the quote form. We will say if the calendar works. Do not wait until the last Wednesday on a split-foundation house.
Do you work Kingsport and Bristol, or only Johnson City?+-
Johnson City and Washington County first. We also cover Kingsport and Bristol TN (Sullivan County) and Jonesborough. Greeneville, Elizabethton, and Erwin when the drive makes sense. Say the town in the form.
What does mitigation usually cost?+-
Often about $800 to $2,500 for typical active soil depressurization. Many jobs cluster near $1,000 to $1,500. Complex foundations run higher. That is a market range, not a bid. Send the foundation and the test number if you have one.
How long does radon mitigation take?+-
Most straightforward systems in Johnson City go in about a day once we have seen the foundation. Count the site visit, design, install day, and a post-mitigation test after the house settles. Same-day from a cold call is not a promise for a split hillside or a house that needs electrical run.
How do I pick a radon mitigator in Tennessee?+-
Tennessee has no state radon license, so verify NRPP or NRSB in the public directory. A good quote names the foundation, the fan and sealing, electrical, a post-test, and a certification ID you can look up. Ask us for our certification ID.
Will this website tell me my radon level?+-
No. The Washington County risk explainer talks geology and housing. It will not print a fake pCi/L. The only reading we stand behind is a device in the room.
Longer answers
The short answers stay here. Buying a home, cost, timeline, credentials, crawl encapsulation, monitors versus kits, home value, walk-out spikes, test versus mitigate, the EPA 4.0 line, crawl versus slab, short-term versus long-term tests, mail kits versus a professional test, the high-test handoff, and Zone 1 for homeowners each have a page.
Buying a home in Johnson City
Test every purchase. Zone maps show county potential, not this address. Use the inspection contingency.
After a failed radon test
Elevated result, who pays in a Tennessee deal, crawl versus hillside, and the retest.
Zone 1 for homeowners
What EPA Zone 1 means in Johnson City and Washington County. County potential, not a test of one house.
Mitigation cost in Johnson City
Market ranges, what you are paying for, crawl versus slab, and how to get a real quote.
How long mitigation takes
Site visit, install day, same-day honesty, and the post-mitigation test window.
Choose a mitigator in Tennessee
No state radon license. Verify NRPP or NRSB. Ask us for our certification ID.
Does crawl encapsulation stop radon?
Plastic on a crawl is moisture work. Washington County still needs a test, and often suction under the membrane.
Continuous monitor vs kit
Kits screen fast. Continuous monitors show averages and night spikes common in East Tennessee walk-outs.
Does mitigation hurt home value?
A working system with a post-test usually helps a Johnson City sale. An unread high result is the deal risk.
Walk-out basement night spikes
Short night peaks are common. Decide from the longer average on the lowest lived-in floor, not one scary hour.
Test or mitigate radon first?
Test first. A Washington County map is not a reading. Clear results at or above 4.0 pCi/L mean plan mitigation, then retest.
What EPA 4.0 pCi/L means
4.0 pCi/L is the EPA fix line, not a safe-versus-unsafe cliff. Between 2.0 and 4.0, consider action after a valid Johnson City test.
Crawl space vs slab radon
Both foundation types can test high in Washington County. The foundation changes the system, not whether you should test.
Short-term vs long-term test
Short-term screens a decision this week. Long-term averages seasons. Start with the window your timeline actually needs.
Mail kit vs professional test
A careful mail kit can screen. Contract clocks and messy kit results are when a professional Johnson City test is the cleaner path.
Request a quote
Tell us the town, the foundation, and whether this is a home test or a real-estate deadline. Call or send the form.