Radon Mitigation in Johnston for Split-Levels and Slab Additions
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.
- Iowa HHS credentialed
- 24/7 booking
- 5-year warranty
- Iowa HHS Credentialed
- NRPP / NRSB Certified Techs
- 5-Year Warranty
- 24/7 Support
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.
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.
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.
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.
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.
Residential Radon Mitigation
Radon systems matched to your foundation: basement sub-slab, crawlspace, exterior, waterborne and vapor intrusion.
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Radon Testing
CRM, short-term, long-term, real estate and post-mitigation radon testing by credentialed testers.
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Commercial Radon Systems
Testing and mitigation for schools, HUD multifamily, offices, warehouses and vapor intrusion sites.
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New Construction Radon Systems
Passive system installs for builders, post-construction testing and passive-to-active upgrades.
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Radon System Maintenance
Error codes, fans, pipes and joints, and inspections for existing radon systems, including ones we didn't install.
View ServiceMost local requests start with residential radon mitigation or 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, Start to Finish
Most single-family homes are finished in one day, and every system is verified before we call it done.
- 01
Test
A 48-hour continuous radon monitor test in your home, or send us an existing result.
- 02
Design
We review your foundation, slab sections and sump, then pick suction points and routing.
- 03
Install
Credentialed techs install, seal and add a manometer. Most homes take one day.
- 04
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.
Why Families Near Terra Park and Beaver Creek Choose Us
- Multi-slab system design for split-levels and additions
- Diagnostics before drilling
- Passive system testing and activation
- Close to our northwest Des Moines office
- 5-year warranty on systems and installs
- 24/7 support
Reviews From Local Homeowners
"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."
"Our sunroom addition was the problem area. They added a second suction point under it and tied it to the same fan."
"Professional and on time. The manometer is easy to read and the post-test was well below 4."
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
- 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)
- Johnston incorporated in 1969 and had 222 residents in 1970, 4,702 in 1990 and 24,064 in 2020. (en.wikipedia.org)
- Beaver Creek runs through the city, and Camp Dodge Military Reservation sits within Johnston. (en.wikipedia.org)
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
- Camp Dodge
- Saylorville Lake
- Terra Park
- Paul J. and Ida Trier House
- National Weather Service Des Moines office
- Beaver 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.
Johnston Radon Questions, Answered
Can radon come in through a slab addition?
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?
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?
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?
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?
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.
Also Serving Near Johnston
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.
- Iowa HHS credentialed
- 5-year warranty
- Post-mitigation test