A high radon number in the middle of a sale feels like the deal just cracked. It didn't. This is the most fixable item on any inspection report — and it can be handled inside your closing window.
Call (605) 600-8804Give us the closing date, the test result, and the foundation type — we'll tell you straight whether test, install, and verification fit your window. Call (605) 600-8804 or send the form.
Yes — radon can be tested, mitigated, and verified before closing, and that's usually exactly how it goes. Still, we understand the phone calls we get: the inspection window is shrinking, the buyer is scared, the seller feels accused, and everyone is staring at a number nobody had heard of a week ago. If that's you today, here's the perspective the deadline steals from you: of everything an inspection can flag, radon is the one item with a permanent fix, a known price, and a one-day install.
It's also the least surprising finding in this market. Pennington County sits in EPA Zone 2 on the radon map, yet state test data has shown more than half of local tests coming back above the 4.0 pCi/L action level — and statewide, roughly half of tested South Dakota homes are elevated, a share national analyses have ranked among the very highest in the country. An elevated result doesn't mean something is wrong with this particular house; it means the house sits near the Black Hills. A standard fix runs about $1,200 to $2,500 — a rounding error against the sale price, which is why these deals close.
South Dakota handles radon through its general property-condition disclosure, and the mechanics matter to both sides of the table. Under SDCL § 43-4-44, the seller of a residential property must complete the state's Seller's Property Condition Disclosure Statement — the Department of Labor & Regulation form, revised July 2025 — and deliver it to the buyer before a purchase agreement is signed, or within ten days of the offer being accepted. The form requires disclosure of known environmental hazards, and radon is on that list.
The statute has teeth on both ends. Under SDCL § 43-4-42, a seller who misrepresents or omits what they knew is liable to the buyer for actual damages, and a court may add costs and fees. But SDCL § 43-4-40 gives sellers the other side of that coin: truthfully completing the form is your safe harbor. In practice, a seller who tested, mitigated, and disclosed has nothing to fear from radon — the paperwork protects you. The seller carrying risk is the one who knew and stayed quiet. (This is a plain-English summary, not legal advice; your agent or attorney can apply it to your transaction.)
For buyers, the form is a starting point rather than a guarantee — it covers what the seller knows. If the house has never been tested, there's nothing to disclose, which is why many lenders, relocation programs, and buyers' inspectors in this market ask for a radon test during the inspection period.
No South Dakota statute assigns the cost — radon gets negotiated like a furnace or a roof, and it lands every way:
What breaks a stalemate isn't argument — it's a firm written quote. Once both agents have a real number and an install date, radon shrinks from an unknown into a line item. We turn quotes around fast for exactly that reason.
Faster than most people expect — the install itself is a single visit, typically three to five hours. The calendar is really governed by the testing on either side of the work:
Inside a standard escrow, that whole sequence fits with room to spare. On a compressed timeline, call us with the date before either side promises anything — we'll tell you honestly what fits, because a blown closing helps nobody.
No — and sellers who worry about this have it inverted. A mitigation system with before-and-after test results is documentation, and documentation is what real estate runs on. It tells the next buyer three things at once: this home was tested, the result was addressed, and the fix was verified with a number. Compare that with the alternative — an untested house in a county where state data has shown most submitted tests coming back elevated — and the mitigated home is the easier sale, not the harder one.
It also simplifies every future SDCL 43-4-44 disclosure: the system is disclosed, the verification test is attached, done. The fix is permanent, the paperwork carries forward, and the only recurring item is a fan that lasts about 11 years and costs a few dollars a month to run. In a market this radon-prone, "already mitigated" reads the way "new roof" does — one less thing.
Call with the date and the number. You'll hang up knowing the price, the timeline, and whether it all fits — no guesswork left.
(605) 600-8804You need three things from a radon contractor: speed, a number your clients can act on, and paperwork that holds up. That's the job. We schedule around inspection and closing dates rather than our own convenience, we quote firm in writing so negotiations run on real figures, and we keep you copied so you're never chasing a status update the day before walkthrough.
Every install is built to the ANSI/AARST standards and ends with a documented post-mitigation verification test — the before-and-after numbers that satisfy a buyer, support the seller's disclosure form, and stay useful at the next sale. One thing worth passing to your clients: South Dakota doesn't license radon work, so make sure whoever touches your transaction — us or anyone else — commits to standards-based work and a verification test in writing. Have a listing you know will need testing, or a buyer staring at a 12 this morning? Call (605) 600-8804 and we'll take it from here.
South Dakota law doesn't assign it; it's negotiated like any other inspection item. Common outcomes: the seller installs a system before closing, the seller credits the cost at settlement, or the two sides split it. At roughly $1,200 to $2,500 for a standard system, it's a small line next to the sale price — which is why radon rarely kills a deal.
The install itself takes a single visit, usually three to five hours. The schedule-driver is the verification test afterward, which needs at least 48 hours. Test, install, and verify commonly fit inside a normal closing window. Call with your date and we'll tell you honestly whether it fits.
Yes. Under SDCL 43-4-44, sellers of residential property complete the state disclosure form — which covers known environmental hazards, including radon — and deliver it before a purchase agreement is signed or within ten days of offer acceptance. A seller who misrepresents or omits can be liable for the buyer's actual damages under 43-4-42, while truthfully completing the form is the seller's safe harbor under 43-4-40.
Almost never over radon alone. It has a permanent, well-understood fix at a known price, unlike structural surprises. And with state test data showing more than half of Pennington County tests above 4.0 pCi/L, the next house may well test the same. Negotiate the fix and keep the house you wanted.
No — it helps. A system with before-and-after test results tells the next buyer the issue was found, fixed, and verified. It also makes the seller's SDCL 43-4-44 disclosure simple: disclose the system, hand over the paperwork. Buyers worry about unknowns, and a documented system removes one.
Yes, once a post-mitigation verification test shows the level below the EPA action level of 4.0 pCi/L. The pipe isn't the proof — the follow-up number is. Ask for that result and keep it with your closing file; it stays useful all the way to your own future sale.