# Radon Mitigation and Testing in Johnston, Iowa > 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/ Serving Johnston & nearby areas # Radon Mitigation and Testing in Johnston, Iowa The trusted local radon experts in Johnston since 2016. Schedule An Estimate [/free-estimate/ →](/free-estimate/) Call (515) 218-7447 [tel:+15152187447 →](tel:+15152187447) Last updated October 27, 2026 ![Radon Mitigation Des Moines service van parked in front of a central Iowa home](/images/misc/radon-mitigation-des-moines-se-1793203436759-ee84j6.webp) - Certified Radon Techs - 5-Year Warranty - 24/7 Support Know the risk ## Radon Mitigation Issues Johnston Homeowners See Most The basement passed, but the sunroom addition did not. - 01 ### Split-levels and additions Johnston went from 222 residents in 1970 to 24,064 in 2020, so most homes are 1980s-and-later split-levels, many expanded with sunroom or family room additions on their own slab. - 02 ### The addition nobody mitigated Those additions sit on a separate slab with no gravel bed beneath it, so radon enters there even after the main basement has been mitigated. - 03 ### Our fix in Johnston We check every addition during diagnostics and, where one needs it, tie a second suction point into the same fan, then test the whole house. Our services ## What We Offer for Split-Levels and Additions Radon testing, mitigation, new construction, commercial systems and maintenance in Johnston. ![Radon mitigation pipe and fan installed on the exterior of a two-story Des Moines home](/images/misc/white-pvc-radon-mitigation-pip-1793203573543-rlr2sd.webp) Residential Radon Mitigation We size the system to your foundation: basement sub-slab, crawlspace, exterior or vapor intrusion. View service → [/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) Radon Testing We run CRM, short-term, long-term, real estate and post-mitigation tests with credentialed testers. View service → [/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) Commercial Radon Systems We test and mitigate schools, HUD multifamily, offices, warehouses and vapor intrusion sites. View service → [/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) New Construction Systems We rough in passive systems for builders, test after move-in and upgrade passive pipes to active. View service → [/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) Radon System Maintenance We fix fan alarms, error codes, pipes and joints, and maintain and inspect radon systems from any installer. View service → [/radon-system-maintenance/ →](/radon-system-maintenance/) ![Technician cleaning a main supply duct in a Des Moines basement with a rotary brush and vacuum hose](/images/hero/technician-cleaning-a-main-supply-air-duct-trunk-l.webp) Air Duct Cleaning We clean the supply and return ducts in Des Moines homes and leave a written quote before any work. View service → [/air-duct-cleaning/ →](/air-duct-cleaning/) Every job completed by Radon Mitigation Des Moines [/ →](/) in Johnston gets a system designed for the foundation, installed by certified technicians and tested when it is done. Why choose us ## Why Families Near Terra Park and Beaver Creek Choose Us In Johnston we are most often called for residential radon mitigation and radon testing. On every job you get: - 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 ![Finished radon mitigation system on the side of an Iowa suburban home](/images/features/finished-radon-mitigation-system-with-white-pvc-pi.webp) How it works ## How It Works, Start to Finish Most homes are finished in one day. We test every system before we call it done. 1. 1 ### Test A 48-hour continuous radon monitor test in your home, or send us an existing result. ![Continuous radon monitor on a small table in a Des Moines home](/images/misc/continuous-radon-monitor-sitting-on-a-small-table-.webp) 2. 2 ### Design We review your foundation, slab sections and sump, then pick suction points and routing. ![Technician running pressure field extension diagnostics in a basement](/images/features/technician-running-pressure-field-extension-diagno.webp) 3. 3 ### Install We install the system, seal the entry points and add a manometer. Most homes take one day. ![Finished radon mitigation system with white PVC pipe on the side of a home](/images/features/finished-radon-mitigation-system-with-white-pvc-pi.webp) 4. 4 ### Verify A post-mitigation test proves the level dropped. The system has a 5-year warranty. ![U-tube manometer on a radon pipe showing steady suction](/images/misc/close-up-of-a-u-tube-manometer-on-a-white-radon-pi.webp) Schedule An Estimate [/free-estimate/ →](/free-estimate/) Reviews ## Reviews From Johnston 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." Natalie S. · Johnston ★★★★★ > "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 ★★★★★ > "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 → [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 GETTING THERE ### A Short Drive to Johnston Johnston is just north of Des Moines. 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) [https://en.wikipedia.org/wiki/Johnston,_Iowa →](https://en.wikipedia.org/wiki/Johnston,_Iowa) - 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) - 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) Service areas ## Where We Work in Johnston ### Areas served - Terra Park area - Beaver Creek - Merle Hay Rd corridor - Johnston Station - Northwest Johnston - Saylorville Lake area - Camp Dodge area ### 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 Des Moines into Johnston, and I-35/80 and Iowa Highway 141 cover the west side toward Camp Dodge. ZIP codes: 50131 FAQ ## Johnston Radon Questions, Answered ### 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. ### 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. ### 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. ### 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. ### Johnston is just north of Des Moines, 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. Schedule An Estimate [/free-estimate/ →](/free-estimate/) Call (515) 218-7447 [tel:+15152187447 →](tel:+15152187447) Service areas ## Also Serving Near Johnston - Urbandale [/service-areas/urbandale/ →](/service-areas/urbandale/) - Grimes [/service-areas/grimes/ →](/service-areas/grimes/) - Ankeny [/service-areas/ankeny/ →](/service-areas/ankeny/) - Polk City [/service-areas/polk-city/ →](/service-areas/polk-city/) All service areas → [/service-areas/ →](/service-areas/) Des Moines & Central Iowa ## Book Radon Mitigation in Johnston Schedule An Estimate [/free-estimate/ →](/free-estimate/) Call (515) 218-7447 [tel:+15152187447 →](tel:+15152187447)