Radon Testing and Inspection in Sioux Falls, SD

Call (605) 210-7667 You hear back from a person, not an autoresponder, within one business day. Call before 3pm on a weekday and it is usually the same afternoon.

Continuous radon monitor set up for testing in a Sioux Falls basement

Start here, because everything else depends on the number. South Dakota gives away 500 free radon test kits a year through DANR, and for a homeowner with no deadline that free kit is genuinely the right first move. Order it, run it under closed-house conditions for the required window, mail it in. If it comes back under 4.0, retest in two years and get on with your life.

When a free kit is the wrong tool

Real estate is the obvious case. A charcoal kit takes days to mail and days to analyze, and a purchase agreement does not wait. It also produces a single averaged number with no record of what happened hour to hour, which matters because a kit that got moved, or a window that got opened, leaves no evidence either way. Continuous monitors solve both problems. Ours log hourly, run 48 hours, and print a tamper record along with the result, which is the documentation a title company or a relocation company will actually accept.

Where the kit goes, and why most DIY tests are wrong

Lowest livable level, at least 20 inches off the floor, four inches from any other object, a foot from an exterior wall, three feet from a window. Closed-house conditions for 12 hours before and throughout. Those numbers come straight off the DANR guidance and almost nobody follows all of them. A kit sitting on the concrete floor next to the dryer will give you a number, just not a number that means anything. The most common call we get is somebody whose two tests came back 4 pCi/L apart, and roughly every time the answer is placement.

Post-mitigation and existing system testing

Every install we do ends with a test, included. Separately, we test systems other people installed, which around Sioux Falls is a steady piece of the work. A system with a dead fan reads like no system at all, and a manometer showing level liquid has been telling somebody that for months. If you bought a house that came with a system and nobody handed you a test result, you do not know what it is doing.

How long does a radon test take?

48 hours with a continuous monitor, two to seven days with a charcoal kit plus lab turnaround. Long-term alpha track tests run 90 days and give the most accurate annual picture.

What radon level requires mitigation?

The EPA action level is 4.0 pCi/L. There is no threshold below which radon is considered safe, and many Sioux Falls homeowners choose to mitigate in the 2 to 4 range, particularly with kids sleeping in a basement bedroom.

Does South Dakota require radon testing when selling a house?

No. South Dakota requires sellers to disclose known radon levels but does not require a test, and it does not require landlords to disclose to tenants. In practice most Sioux Falls agents now recommend testing before listing so the number is not a surprise during inspection.

Available across the Sioux Falls area

Related radon services

Need radon testing and inspection in Sioux Falls? Call (605) 210-7667 or send the form for a written, itemized quote. Back to radon mitigation in Sioux Falls.