# Radon Mitigation Knoxville, IA | 5-Year Warranty, 24/7

> Radon testing and mitigation in Knoxville, Iowa and Marion County. Credentialed techs and a 5-year warranty.

URL: https://radonmitigationdesmoines.com/service-areas/knoxville/

![Radon technician arriving at a central Iowa home with a radon monitor](/images/misc/radon-technician-walking-up-the-driveway-of-a-cent.webp)

location\_on Serving Knoxville & nearby areas

# Radon Mitigation in Knoxville, Iowa

Last updated: October 27, 2026

Knoxville is the Marion County seat, home of Knoxville Raceway and a few miles south of Lake Red Rock. Many in-town homes date to the coal and railroad era and sit on stone or block foundations.

-   verifiedIowa HHS credentialed
-   schedule24/7 booking
-   shield5-year warranty

Request a Quote

[/contact/ →](/contact/)

 

phone\_in\_talk (515) 218-7447

[tel:+15152187447 →](tel:+15152187447)

-   verified Iowa HHS Credentialed
-   workspace\_premium NRPP / NRSB Certified Techs
-   shield 5-Year Warranty
-   support\_agent 24/7 Support

Know the risk

## Radon Mitigation Problems in Knoxville, Iowa Homes

The local problem

### Stone foundations under Knoxville's coal-era homes

**What you notice:** An old house near the square tests high, and the basement walls are rough stone or rubble.

**Why it happens here:** Knoxville was founded in 1845 and grew with nearby coal mining in the 1870s and 1880s, so many in-town homes have stone or rubble foundations that leak soil gas through every joint.

**How we fix it:** We seal stone walls and the sump, add sub-slab suction and, where the floor is dirt or thin, a membrane tied into the same residential radon mitigation fan.

map

### Every Iowa county is EPA Zone 1

About 71% of Iowa homes test above the EPA action level of 4.0 pCi/L. Your neighbor's number tells you little about yours, so a 48-hour test is the only way to know.

ac\_unit

### Winter makes it worse

When the furnace runs and the ground freezes, warm air rises out of the house and pulls soil gas in through the slab, sump and cracks.

real\_estate\_agent

### High results stall closings

A failed radon test during inspection can hold up a sale. We test inside your contingency window and can install and verify a system before closing.

Radon services

## Radon Services for Marion County Homes

Testing, mitigation, new construction, commercial and maintenance from one credentialed team. The services most requested here are listed first.

home

### Residential Radon Mitigation

Radon systems matched to your foundation: basement sub-slab, crawlspace, exterior, waterborne and vapor intrusion.

View Service arrow\_forward

[Residential Radon Mitigation →](/residential-radon-mitigation/)

monitor\_heart

### Radon Testing

CRM, short-term, long-term, real estate and post-mitigation radon testing by credentialed testers.

View Service arrow\_forward

[Radon Testing →](/radon-testing/)

domain

### Commercial Radon Systems

Testing and mitigation for schools, HUD multifamily, offices, warehouses and vapor intrusion sites.

View Service arrow\_forward

[Commercial Radon Systems →](/commercial-radon-systems/)

construction

### New Construction Radon Systems

Passive system installs for builders, post-construction testing and passive-to-active upgrades.

View Service arrow\_forward

[New Construction Radon Systems →](/new-construction-radon-systems/)

build

### Radon System Maintenance

Error codes, fans, pipes and joints, and inspections for existing radon systems, including ones we didn't install.

View Service arrow\_forward

[Radon System Maintenance →](/radon-system-maintenance/)

Most local requests start with 

residential radon mitigation

[/residential-radon-mitigation/ →](/residential-radon-mitigation/)

 or 

radon testing

[/radon-testing/ →](/radon-testing/)

. Every job is handled by the same Iowa HHS-credentialed crews behind our 

radon mitigation in Des Moines

[/ →](/)

, with the same post-mitigation test and 5-year warranty.

How it works

## How It Works

Most single-family homes are finished in one day, and every system is verified before we call it done.

1.  01 monitor\_heart
    
    ### Test
    
    A 48-hour continuous radon monitor test in your home, or send us an existing result.
    
2.  02 architecture
    
    ### Design
    
    We review your foundation, slab sections and sump, then pick suction points and routing.
    
3.  03 construction
    
    ### Install
    
    Credentialed techs install, seal and add a manometer. Most homes take one day.
    
4.  04 fact\_check
    
    ### Verify
    
    A post-mitigation test proves the result, backed by our 5-year warranty.
    

## Old Stone Basement? We Know What to Do

Send your result and foundation type for a written quote. Every system is verified with a post-mitigation test and covered by our 5-year warranty on systems and installs.

phone\_in\_talk (515) 218-7447

[tel:+15152187447 →](tel:+15152187447)

 

Request a Quote

[/contact/ →](/contact/)

Why choose us

## Why Homeowners Near the Raceway Call Us

-   check\_circleOlder foundation experience
-   check\_circleCrawlspace membranes
-   check\_circleCredentialed techs
-   check\_circle5-year warranty
-   check\_circle24/7 support

![Finished radon mitigation system on the side of an Iowa suburban home](/images/features/finished-radon-mitigation-system-with-white-pvc-pi.webp)

Client Verification

## Reviews From Local Homeowners

starstarstarstarstar

> "They explained every step and the system has been running quietly since."

Pam G. · Knoxville

starstarstarstarstar

> "Basement plus crawlspace addition. One system handled both."

Larry W. · Lake Red Rock area

Read our reviews on Google open\_in\_new

[https://search.google.com/local/reviews?placeid=ChIJRTO3QJee7ocRgEpZOJOW_-U →](https://search.google.com/local/reviews?placeid=ChIJRTO3QJee7ocRgEpZOJOW_-U)

Local knowledge

## Experience With Coal-Era Foundations

Local logistics

### Serving Knoxville

We reach Knoxville on **Iowa Highway 5** and use Highways 14 and 92 to cover downtown, the **Knoxville Raceway** area and homes toward Lake Red Rock. Visits are grouped on scheduled days.

Local homes

### Stone and Block Foundations

Knoxville dates to 1845 and grew with nearby coal mining in the 1870s and 1880s. Many older homes near the courthouse square sit on stone or block foundations with open sumps.

A sub-slab system with thorough wall sealing is the usual fix, sometimes with a crawlspace membrane for older additions.

### Local facts that shape the job

-   fact\_check Knoxville is the Marion County seat and uses ZIP code 50138, with Lake Red Rock and Elk Rock State Park about 4 miles north. 
    
    (en.wikipedia.org)
    
    [https://en.wikipedia.org/wiki/Knoxville,_Iowa →](https://en.wikipedia.org/wiki/Knoxville,_Iowa)
    
-   fact\_check Knoxville was founded in 1845, incorporated in 1855, and saw significant coal mining nearby in the 1870s and 1880s. 
    
    (en.wikipedia.org)
    
    [https://en.wikipedia.org/wiki/Knoxville,_Iowa →](https://en.wikipedia.org/wiki/Knoxville,_Iowa)
    
-   fact\_check The 2020 census counted 3,494 housing units in Knoxville. 
    
    (en.wikipedia.org)
    
    [https://en.wikipedia.org/wiki/Knoxville,_Iowa →](https://en.wikipedia.org/wiki/Knoxville,_Iowa)
    

Where we work

## Neighborhoods and Routes We Cover in Knoxville

### Areas served

-   Downtown Knoxville
-   Courthouse square
-   Knoxville Raceway area
-   Lake Red Rock area
-   Elk Rock area

ZIP codes we cover: 50138

### Local landmarks

-   location\_onKnoxville Raceway
-   location\_onNational Sprint Car Hall of Fame & Museum
-   location\_onMarion County Courthouse
-   location\_onLake Red Rock
-   location\_onElk Rock State Park

### How we get there

We reach Knoxville on Iowa Highway 5, with Iowa Highways 14 and 92 covering downtown and the roads north toward Lake Red Rock.

Straight Answers

## Knoxville Radon FAQs

### Can you mitigate a stone foundation near the Knoxville square?

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Yes. Stone and rubble walls let soil gas through the joints, so we seal the walls and sump, add sub-slab suction and use a membrane where the floor is dirt or very thin.

### My Knoxville house has a dirt-floor addition. Can it share the basement fan?

expand\_more

Often. We tie a crawlspace membrane and a sub-slab point into one fan when the layout allows, which is common in older Marion County homes.

### How far north toward Lake Red Rock do you travel?

expand\_more

Yes. We reach them on Iowa Highways 14 and 92 and group Marion County visits on scheduled days.

Still have a question?

Our support line answers 24 hours a day, 7 days a week.

phone\_in\_talk (515) 218-7447

[tel:+15152187447 →](tel:+15152187447)

 

Send a Question

[/contact/ →](/contact/)

Nearby service areas

## Also Serving Near Knoxville

-   location\_on Pleasantville
    
    [/service-areas/pleasantville/ →](/service-areas/pleasantville/)
    
-   location\_on Oskaloosa
    
    [/service-areas/oskaloosa/ →](/service-areas/oskaloosa/)
    
-   All service areas
    
    [/service-areas/ →](/service-areas/)
    

![](/images/hero/radon-technician-loading-white-pvc-pipe-and-radon-.webp)

24/7 booking & support

## Book Radon Mitigation in Knoxville

Credentialed testing and mitigation with 24/7 booking, a post-mitigation test and a 5-year warranty on systems and installs.

Request a Quote

[/contact/ →](/contact/)

 

phone\_in\_talk Call (515) 218-7447

[tel:+15152187447 →](tel:+15152187447)

-   verifiedIowa HHS credentialed
-   shield5-year warranty
-   fact\_checkPost-mitigation test