Woodbury County · EPA Radon Zone 1
Radon Mitigation and Testing in Sioux City, IA
Radon mitigation in Sioux City is normally a one-day sub-slab system, because Woodbury County is EPA Radon Zone 1 and the deep, porous loess soils here move soil gas easily. We connect Sioux City homeowners with credentialed specialists for a free, no-obligation quote.
Radon mitigation in Sioux City is normally an active sub-slab depressurization system, installed in about one day by a specialist credentialed by Iowa HHS. Woodbury County is EPA Radon Zone 1, the highest-risk category, and Iowa HHS, citing the EPA, states that "the entire state of Iowa is considered at high risk for radon gas in homes" (read 2026-08-18). Levels vary house to house, so testing is the only way to know yours.
What Iowa requires of that system is more specific than most homeowners expect, and it is worth knowing before you compare quotes. The binding rule is Iowa Administrative Code 641-44.3(3)"c", rewritten effective July 1, 2026, which requires a credentialed person to "comply with all requirements as stated in the ANSI/AARST mitigation standards as amended to August 1, 2025", and names ANSI/AARST SGM-SF-2023, Soil Gas Mitigation Standards for Existing Homes, for a house like yours (rule read in full 2026-08-18). Ask which edition of that standard the design follows. Iowa HHS also keeps older language on its radon program page pointing to the 1993 EPA Radon Mitigation Standards and ASTM E2121; that page has not caught up with the rule, so go by the rule. What to budget is in our radon mitigation cost in Iowa guide.
Iowa Radon Professionals does not test or install systems. We connect Sioux City homeowners with NRPP-certified, Iowa HHS-credentialed radon mitigation specialists who do, and the quote is free and no-obligation. If a test has already come back elevated, start with what to do when a radon test comes back high in Iowa.
Why Radon Levels in Sioux City and Woodbury County Run High
The short answer is the soil. The Sioux City area is blanketed by loess, a fine, wind-deposited silt carried in from glacial outwash plains. The Loess Hills hold some of the thickest loess deposits anywhere in the world. Beneath the loess lie Pre-Illinoian glacial till and layers of sand and gravel, and near Sioux City the Cretaceous bedrock, chalky shale and limestone, sits relatively close to the surface. Uranium in these parent materials decays over time into radium and then radon gas.
What makes loess matter for radon is its structure. Loess is highly porous and unusually permeable for a silt, which means soil gas moves through it efficiently. Radon generated at depth can migrate upward through that open pore network and accumulate under a home’s slab, then enter through cracks, joints, and penetrations. Combined with the area’s many full basements, that gives radon a short, easy route into living space, which is why Sioux City homes so often test high.
The same permeability that lets radon in also shapes how a system is designed. High-permeability loess is generally favorable for active sub-slab depressurization, because a single, well-placed suction point can extend its pressure field across a large area under the slab. A credentialed specialist measures the sub-slab pressure field and sizes the fan to the soil, and seals any sand or gravel lenses that could short-circuit the suction. The goal is a system that holds the whole footprint below the action level, confirmed by a post-mitigation re-test.
One honest limit on all of this: we publish no Sioux City or Woodbury County average, because we have no sourced figure to publish. Radon comes out of the ground and the ground changes over short distances, so two houses on the same block can measure differently. EPA Radon Zone 1 is a prediction about the county, not a reading of your basement. A test kit is.
What Radon Mitigation Costs in Sioux City, and Who Pays
A typical Iowa mitigation job runs near $2,000, with most falling in an $800 to $2,500 range depending on foundation type, the number of suction points needed, and how the system is routed. Sioux City is not a separate pricing market from the rest of the state. Our radon mitigation cost in Iowa guide breaks down what moves that number up or down, and a quote from a credentialed specialist is free.
On help paying for it, here is what we can actually show you. The Iowa Department of Revenue page listing the state’s tax credits and exemptions was read in full on 2026-08-18 and carries no entry for radon testing or radon mitigation, so there is nothing on that list to claim. The one city-run program this site has verified anywhere in Iowa is run by the City of West Des Moines and is limited to households inside that city (verified 2026-08-10), so it does not reach Sioux City. Ask Siouxland District Health what local help exists here, and ask a tax professional about your own return.
Whether a homeowners insurance policy contributes anything toward mitigation depends entirely on the policy and the carrier, so ask yours directly rather than assuming either way. This site does not give insurance advice. What it can tell you is what the work costs and who is credentialed to do it.
Radon Services We Help Sioux City Homeowners Find
We connect Sioux City homeowners with a credentialed specialist for radon mitigation in Iowa and every related service below, from an elevated test result through post-mitigation re-testing.
Radon Mitigation
The standard active soil depressurization system that vents radon from beneath the slab to above the roofline.
Learn MoreRadon Testing
Short-term and long-term radon measurement. Testing is the only way to know your home is above or below the action level.
Learn MoreReal Estate Radon Testing
Fast, transaction-timeline testing for home sales and purchase contingencies, with results that fit closing deadlines.
Learn MoreCrawl Space Radon Mitigation
Sub-membrane depressurization for homes with crawl spaces, sealing and venting soil gas at the source.
Learn MoreRadon System Repair
Diagnosing failing fans, re-testing, and bringing older systems back under the EPA action level.
Learn MoreNew Construction Systems
Passive and active radon-resistant new construction (RRNC) rough-in built into the home from the start.
Learn MoreWhen Sioux City Homes Need Radon Mitigation
Older homes near downtown and Morningside
Brick and early-1900s homes often have stone or block foundations with multiple entry paths for soil gas.
Mid-century basements
Post-war neighborhoods like Leeds and Greenville have finished basements where families spend real time below grade.
Newer bluff-top construction
Even newer homes on the hills test high, because the soil, not the age of the house, drives Sioux City radon.
A house with a crawl space
A crawl space is a different job from a slab, and the membrane and suction design changes with it. See crawl space radon mitigation.
A pending home sale
Woodbury County transactions routinely include a radon contingency on a tight timeline. See real estate radon testing.
A system installed years ago
Fans wear out and pressure gauges drift, so an older system is worth checking rather than assuming it still holds the house below the action level.
Neighborhoods and areas we help homeowners in include Morningside, Leeds, Riverside, Greenville, Indian Hills, North Side, downtown Sioux City.
Radon Test Kits in Sioux City and Woodbury County
Iowa HHS points Iowans at two routes for a first test, and both are cheap. It states: "Contact your local county health department or call 1-800-383-5992 to purchase a do-it-yourself, low-cost test kit" (read 2026-08-18). For Sioux City that local department is Siouxland District Health, which Woodbury County lists among its own departments (read 2026-08-18). Ask what it currently stocks and charges before ordering. Iowa HHS gives that hotline’s hours as "8:30 am (CST) through 4:30 pm (CST)" and it takes kit orders by phone (read 2026-08-18).
The second route is the American Lung Association. Iowa HHS contracts with the ALA to maintain the Radon in Iowa website and staff the hotline, and states that "both short-term and long-term radon test kits are available for purchase from the American Lung Association (ALA) at lung.org/radon" (read 2026-08-18). Kits are also sold at most hardware and home improvement stores. The choice between the two kit types is worth understanding: a short-term kit answers quickly, and a long-term kit measures across a longer stretch of the year.
If a screen comes back at or above 4 pCi/L, that is the point to bring in a professional. Iowa HHS states the action level and then adds a qualifier most pages leave out: "Results at or above 4 pCi/L are considered elevated and mitigation is recommended, however mitigation decisions should not be based upon a single test result" (read 2026-08-18). The state publishes both a list and a map of credentialed mitigation specialists, so checking the person you hire against the live list takes a minute. What else to ask is in radon testing in Iowa and how to verify Iowa radon mitigation contractors.
Sioux City Schools and the Iowa Radon Mandate
Iowa’s HF 2412, the Gail Orcutt Radon School Safety Act, requires every school attendance center in the state to test for radon by July 1, 2027 and every five years after. That mandate covers Sioux City Community School District buildings along with the other districts serving Woodbury County. Families who want to understand testing status can ask their district directly, and the same Zone 1 geology that affects schools affects the homes around them. See our guide to the Iowa school radon mandate.
The NRPP-certified, Iowa HHS-credentialed partner contractor you are matched with is licensed and insured and provides a written workmanship warranty.
Properly installed systems typically reduce radon by 50 to 99% according to the EPA. Your specific result is confirmed by the specialist with a post-mitigation re-test.
How Radon Mitigation Works for Sioux City Homeowners
Free quote request
Submit the form or call. Share your most recent radon level if you have one.
Specialist contact
A credentialed specialist serving the area reaches out to assess your home.
Installation
A standard sub-slab system is typically installed in about one day.
Post-mitigation re-test
The specialist confirms the level dropped below the action level.
Nearby Areas We Serve
Beyond Sioux City, we connect homeowners with credentialed radon specialists throughout Woodbury County and nearby communities, including Sergeant Bluff, Lawton, Moville, Sloan, Le Mars, Hinton. Serving another part of the state? See our service area or request a quote.
What it costs, and what happens after you send it
- What does radon mitigation cost in Sioux City?
- A residential system runs about $800 to $2,500, with a typical Iowa job near $2,000. A standard sub-slab system for a basement home sits at the lower end, $800 to $1,800, while a crawl space or multi-area job runs $1,500 to $2,500. Those figures are published Iowa contractor pricing, market data for comparison rather than a quote or a price set by us. The Iowa cost guide breaks the figures out by system type and lists what moves a quote.
- How fast will someone get back to me?
- Calls and form submissions reach Compass Camper LLC directly. We read the request and pass it to an independent local radon professional, usually within about an hour during the day. That professional then contacts you to look at the home and quote the work on their own schedule.
- What work is covered?
- Radon mitigation, radon testing, real estate radon testing, crawl space mitigation, system repair, and new-construction systems. See every service.
Only the independent radon professional you are matched with can price your actual home. Compass Camper LLC does not test or mitigate radon and does not quote it.
Frequently Asked Questions
How much does radon mitigation cost in Sioux City?
A typical Iowa mitigation job runs near $2,000, with most falling in an $800 to $2,500 range depending on foundation type, the number of suction points needed, and how the system is routed. Sioux City is not a separate pricing market from the rest of Iowa, so the statewide figures are the ones to plan against. Our Iowa cost guide breaks the number down, and a quote from a credentialed specialist is free.
Can I get a tax credit for radon mitigation in Iowa?
Not from the state list. The Iowa Department of Revenue page listing tax credits and exemptions was read in full on 2026-08-18 and carries no entry for radon testing or radon mitigation. The one city-run program this site has verified anywhere in Iowa is run by the City of West Des Moines and reaches only households inside that city (verified 2026-08-10), so it does not apply in Sioux City. Ask Siouxland District Health about local help, and ask a tax professional about your own return.
What month is radon highest in Sioux City?
Levels in the same house move around, which is why Iowa HHS states that "mitigation decisions should not be based upon a single test result" (read 2026-08-18). Rather than picking a month, confirm the result you have: run a second short-term test, or a long-term kit that measures across a longer stretch of the year, before committing to a system. A certified measurement specialist follows the EPA and ANSI/AARST protocols Iowa HHS names, which is what makes one result comparable to another.
What does Iowa require of a radon mitigation system?
Iowa Administrative Code 641-44.3(3)"c", rewritten effective July 1, 2026, requires a credentialed person to "comply with all requirements as stated in the ANSI/AARST mitigation standards as amended to August 1, 2025". For a single-family home that standard is ANSI/AARST SGM-SF-2023, Soil Gas Mitigation Standards for Existing Homes (rule read in full 2026-08-18). Carry that into the quote conversation: ask which edition of the ANSI/AARST standard the design follows and who is credentialed to sign off on it. Iowa HHS still shows older language on its radon program page citing the 1993 EPA Radon Mitigation Standards and ASTM E2121, which the rule has since superseded.
How high is radon in Sioux City?
All of Woodbury County is EPA Radon Zone 1, the highest-risk category, so homes here are predicted to average above the 4 pCi/L action level. Many test elevated, and your own home should be tested, since levels vary house to house. We publish no Sioux City average, because no sourced figure exists for us to publish.
Why are Sioux City radon levels so high?
The area’s deep loess soils are highly porous and permeable, so radon generated in the soil and underlying glacial and Cretaceous materials migrates upward efficiently and collects under homes. The soil, not the age of the house, is the main driver.
Where can I get a radon test kit in Sioux City?
Iowa HHS directs Iowans to their local county health department or the Iowa Radon Hotline at 1-800-383-5992 for a low-cost do-it-yourself kit (read 2026-08-18). For Sioux City that department is Siouxland District Health, so ask what it currently stocks and charges. Both short-term and long-term kits are also sold by the American Lung Association at lung.org/radon, and kits are stocked by most hardware stores. For a home sale or a post-mitigation check, the measurement should be done by a certified specialist to the applicable protocol.
Who installs the system?
An NRPP-certified, Iowa HHS-credentialed partner contractor serving the Sioux City area. That contractor is licensed and insured and provides a written workmanship warranty. You contract directly with them.
Get Your Free Sioux City Radon Quote
Tell us about your home and a credentialed specialist serving Woodbury County follows up. Prefer to talk? Call (712) 218-3501.
When you submit this form, your information is shared with an NRPP-certified, Iowa HHS-credentialed radon specialist for the purpose of scheduling your free quote.
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