Questions we hear in Johnson City and the Tri-Cities

The EPA maps Washington County as Zone 1, the highest predicted indoor-radon band (average screening above 4 pCi/L). Sullivan County is Zone 1 too. Carter and Unicoi next door are Zone 2. The map is why we take the county seriously. It is not a reading for your hallway. Test the house.

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.

No. Tennessee does not issue a state radon measurement or mitigation license. TDEC points people to national credentials: NRPP and NRSB. Ask for the credential and look it up on the directory.

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.

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.

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.

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.

Johnson City and Washington County first. We also cover Kingsport and Bristol TN (Sullivan County) and Jonesborough. Elizabethton and Unicoi when the drive makes sense. Say the town in the form.

Straightforward crawl or slab jobs in this region often land somewhere between $800 and $2,500. Split hillside foundations and historic stone crawls run more. That is a market range, not a bid. Send the foundation and the test number if you have one.

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.