Radon testing and mitigation in Sioux City
Never tested, or holding a result of 4 pCi/L or more? One call connects you with a credentialed radon mitigation company that works in your part of Siouxland.
Where do things stand?
- Radon testingShort-term and long-term kits, continuous monitors, confirming a high result, and the test after a system goes in.
- Radon mitigation systemsSub-slab depressurization systems that pull radon from under the floor and vent it above the roof line.
- Crawl space radonSealed membrane systems for crawl spaces, plus suction for slab rooms and homes with more than one foundation type.
- Radon fan repairFailed or noisy fans, flat manometers, cracked pipe, alarms, retesting, and activating passive radon pipes.
- Real estate radonTesting in the inspection window, fixing a high result before closing, and checking an existing system's paperwork.
How it works
Call or send a request
Tell us your town and your situation: no test yet, a high number, a home sale, or a system that needs a look.
We connect you
Your call goes to an independent radon company that serves Sioux City and the surrounding towns.
They call you back
They see the house and quote the test or the mitigation system with you directly.
Who is this for?
Homeowners, buyers, sellers and landlords in Sioux City, Sergeant Bluff and Le Mars in Iowa, and South Sioux City across the Missouri River in Nebraska. Any house that sits on soil, through a basement, crawl space or slab, can draw radon in. You can't see, smell or taste it, so testing is the only way to find out.
How common is radon around Sioux City?
Common on both sides of the river.
- Iowa: Iowa HHS says the EPA considers the entire state of Iowa at high risk for radon in homes. There's no low-radon corner of the state to count on.
- Nebraska: The Nebraska Department of Health and Human Services (DHHS) says more than half of radon tests in the state come in above the 4.0 pCi/L action level.
- The health risk: The EPA estimates radon is responsible for about 21,000 lung cancer deaths a year in the U.S. It's the top cause of lung cancer among non-smokers and the second leading cause overall.
How does radon get into a house?
Radon forms as uranium in soil and rock breaks down. It moves up through the ground and enters through slab cracks, the joint where the floor meets the foundation wall, sump pits, floor drains, utility penetrations and bare soil in crawl spaces. Houses usually sit at slightly lower air pressure than the soil around them, especially when the furnace is running, so they pull soil gas in.
Does Sioux City's terrain change anything?
Sioux City is a hilly town; Stone State Park, at the city's northwest corner, sits near the northern end of Iowa's Loess Hills, while South Sioux City across the river is nearly flat. Hillside lots mean a lot of walkout basements and split foundations, and older Northside and Morningside homes often have additions on different footings. None of that predicts your number, but it does shape the system design. Radon levels vary house to house, so test yours.
How do I test?
Use a short-term kit for a quick look or a long-term kit, which runs more than 90 days, for a better read on your average. Place it on the lowest floor you live on, keep the house closed up, and mail it promptly. Iowa's Radon Hotline, 1-800-383-5992, sells low-cost kits, and Iowa HHS has offered one free kit per household through partner programs while supplies last. For real estate, a certified radon measurement specialist with a continuous monitor is the usual choice. See radon testing.
What if my result is high?
Iowa HHS treats results at or above 4 pCi/L as elevated and recommends mitigation, but says the decision shouldn't rest on a single test. The EPA suggests considering a fix between 2 and 4 pCi/L too. The usual fix is sub-slab depressurization: a pipe and fan that pull soil gas from under the floor and vent it above the roof. See radon mitigation systems.
Do radon contractors need a credential in Iowa?
Yes. Iowa's radon mitigation rules, rewritten effective July 1, 2026, say no one may mitigate radon for a fee in Iowa without an Iowa HHS credential, and that includes out-of-state companies working for Iowa residents. Turning a passive radon pipe into an active system, or modifying an active one, also takes a credentialed person. Under the same rules the house is tested before and after mitigation, and the system must bring radon below 4 pCi/L in the area where it's installed. In South Sioux City, Nebraska requires a DHHS license for radon work. The Siouxland radon guide explains all of it, with sources.
What does a radon system cost?
It depends on the foundation (full basement, walkout, crawl space, slab or a mix), how freely air moves under the slab, where the pipe can run, and how many suction points the house needs. The company you're connected with sees the house and gives you a written quote. We don't set or quote prices.
Are you a radon company?
No. Sioux City Radon Removal is a referral service. We pass your call to an independent radon company that serves your address, and that company does the testing, quoting, installing and warranty work. Before you sign, read our tips for hiring a radon contractor.
Areas we cover
Planning ahead? Read our Siouxland radon guide.
Common questions
Who will test or fix my house?
An independent radon company that serves your area. We connect you; we don't test or install systems ourselves.
Is there a fee to use this site?
No. Calling or sending a request is free. The radon company quotes and bills its work directly.
What towns do you cover?
Sioux City, Sergeant Bluff and Le Mars in Iowa, South Sioux City in Nebraska, and nearby Siouxland towns.
At what level should I fix radon?
Iowa HHS recommends mitigation at or above 4 pCi/L, confirmed by more than one test. The EPA suggests considering it from 2 to 4 pCi/L.
Radon number higher than you hoped?
Call and a local radon mitigation company will look at the house and quote a system.