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

> Radon mitigation in Johnston for split-level and slab homes. Iowa HHS-credentialed testing and systems backed by a 5-year warranty.

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

![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 Johnston & nearby areas

# Radon Mitigation in Johnston for Split-Levels and Slab Additions

Last updated: October 27, 2026

Johnston has many split-level homes and slab additions from the 1970s through the 1990s, plus newer subdivisions. Multi-slab homes may need more than one suction point.

-   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 Issues Johnston Homeowners See Most

The local problem

### The basement passed, but the sunroom addition did not

**What you notice:** A system lowered the basement reading, yet a family room or sunroom addition still tests above the action level.

**Why it happens here:** Johnston went from 222 residents in 1970 to more than 17,000 by 2010, so most homes are 1980s-and-later split-levels, many since expanded with on-grade additions on their own slab and no gravel bed.

**How we fix it:** Residential radon mitigation here includes checking each addition during diagnostics and, where needed, tying a second suction point into the same 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.

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### 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.

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### 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

## What We Offer for Split-Levels and Additions

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

![Radon mitigation pipe and fan installed on the exterior of a two-story Des Moines home](/images/misc/white-pvc-radon-mitigation-pipe-with-inline-radon-.webp)

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/)

![Continuous radon monitor placed in the lowest lived-in level of a Des Moines home](/images/misc/continuous-radon-monitor-sitting-on-a-small-table-.webp)

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### 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/)

![Commercial radon mitigation system on the exterior of an Iowa school building](/images/misc/radon-mitigation-pipes-and-fans-mounted-on-the-ext.webp)

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/)

![New construction home in a Des Moines suburb with a radon pipe stub set before the slab pour](/images/misc/new-construction-home-framing-in-a-waukee-subdivis.webp)

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/)

![Technician replacing a radon fan on the exterior pipe of a Des Moines-area home](/images/misc/radon-technician-on-a-ladder-replacing-an-old-rado.webp)

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, Start to Finish

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.
    

## Additions Testing High? We Can Help

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 Families Near Terra Park and Beaver Creek Choose Us

-   check\_circleMulti-slab system design for split-levels and additions
-   check\_circleDiagnostics before drilling
-   check\_circlePassive system testing and activation
-   check\_circleClose to our northwest Des Moines office
-   check\_circle5-year warranty on systems and installs
-   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

> "We tested before finishing our basement. The report showed the level spiked at night, which made the decision easy. They explained everything without making us panic."

Natalie S. · Johnston

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> "Our sunroom addition was the problem area. They added a second suction point under it and tied it to the same fan."

Rob T. · Beaver Creek

starstarstarstarstar

> "Professional and on time. The manometer is easy to read and the post-test was well below 4."

Kelly D. · Terra Park 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

## Local Experience With Multi-Slab Homes

Local logistics

### A Short Drive to Johnston

Johnston is just north of our Franklin Ave office. Merle Hay Rd and NW 86th St take us straight into town, and I-35/80 covers the neighborhoods near Camp Dodge and toward Saylorville Lake.

Because we're close, it's easy to schedule a diagnostics visit and install back to back. Fan alarms and repair questions go through our 24-hour line.

Local homes

### Split-Levels and Slab Additions

**Split-levels.** Many Johnston homes built in the 1970s through the 1990s have a lower level on one slab and a family room or garage on another. Each slab can need its own suction.

**Slab-on-grade additions.** Sunrooms and family room additions often sit on a separate slab with no gravel layer. Radon can enter there even after the basement is mitigated, so we check additions as part of the design.

**Newer subdivisions.** Newer homes near Terra Park and northwest Johnston may have passive radon pipe. A post-construction test tells you if it's enough.

### Local facts that shape the job

-   fact\_check Johnston is in Polk County, uses ZIP code 50131, and borders the Des Moines River with part of Saylorville Reservoir inside city limits. 
    
    (en.wikipedia.org)
    
    [https://en.wikipedia.org/wiki/Johnston,_Iowa →](https://en.wikipedia.org/wiki/Johnston,_Iowa)
    
-   fact\_check Johnston incorporated in 1969 and had 222 residents in 1970, 4,702 in 1990 and 24,064 in 2020. 
    
    (en.wikipedia.org)
    
    [https://en.wikipedia.org/wiki/Johnston,_Iowa →](https://en.wikipedia.org/wiki/Johnston,_Iowa)
    
-   fact\_check Beaver Creek runs through the city, and Camp Dodge Military Reservation sits within Johnston. 
    
    (en.wikipedia.org)
    
    [https://en.wikipedia.org/wiki/Johnston,_Iowa →](https://en.wikipedia.org/wiki/Johnston,_Iowa)
    

Where we work

## Neighborhoods and Routes We Cover in Johnston

### Areas served

-   Terra Park area
-   Beaver Creek
-   Merle Hay Rd corridor
-   Johnston Station
-   Northwest Johnston
-   Saylorville Lake area
-   Camp Dodge area

ZIP codes we cover: 50131

### Local landmarks

-   location\_onCamp Dodge
-   location\_onSaylorville Lake
-   location\_onTerra Park
-   location\_onPaul J. and Ida Trier House
-   location\_onNational Weather Service Des Moines office
-   location\_onBeaver Creek

### How we get there

Merle Hay Rd and NW 86th St take us north from our Franklin Ave office into Johnston, and I-35/80 and Iowa Highway 141 cover the west side toward Camp Dodge.

Straight Answers

## Johnston Radon Questions, Answered

### Can radon come in through a slab addition?

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Yes. Sunrooms and family room additions often sit on a separate slab without a gravel layer. We test suction under them during diagnostics and include them in the design if the main system will not reach.

### Does a split-level need more than one suction point?

expand\_more

Sometimes. Most homes in town were built after 1980 as split-levels or two-stories. We measure suction reach under each slab before designing, and add a second point on the same fan only when one cannot cover both.

### Do you cover Johnston Station and the Camp Dodge side of town?

expand\_more

Yes. We cover the Merle Hay Rd corridor, Beaver Creek, the Terra Park area and neighborhoods toward Saylorville Lake and Camp Dodge, reached by Merle Hay Rd and Iowa Highway 141.

### Should I test before finishing my basement?

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Yes. It is easier and cheaper to place a suction point and route pipe while walls are open. Test again after the finish work, since new flooring and framing can change how air moves.

### How quickly can you schedule a Johnston diagnostics visit?

expand\_more

Johnston is just north of our Franklin Ave office, so we can often book diagnostics and the install back to back. Call our 24-hour line for the next available time.

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 Johnston

-   location\_on Urbandale
    
    [/service-areas/urbandale/ →](/service-areas/urbandale/)
    
-   location\_on Grimes
    
    [/service-areas/grimes/ →](/service-areas/grimes/)
    
-   location\_on Ankeny
    
    [/service-areas/ankeny/ →](/service-areas/ankeny/)
    
-   location\_on Polk City
    
    [/service-areas/polk-city/ →](/service-areas/polk-city/)
    
-   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 Johnston

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