Commercial & Multifamily Radon Services in Iowa City, IA

Radon Is a Building Problem, Not Just a House Problem

Any occupied space in contact with the ground can accumulate radon: ground-floor apartments, walkout offices, basement break rooms, daycare classrooms, storage areas converted to workspace. Upper floors are generally lower risk, but stairwells, elevator shafts, and mechanical chases can carry soil gas upward in ways that surprise people.

The health stakes are the same as in a home. Radon is the second-leading cause of lung cancer overall and the leading cause among non-smokers, with the EPA attributing about 21,000 U.S. lung cancer deaths per year to it. The difference in a commercial or multifamily building is scale: one elevated slab can expose dozens of tenants or employees at once.

Owners also face pressure homeowners do not. Iowa City's rental ordinance, in effect since July 1, 2021, requires radon testing for single-family and duplex rentals on the rental permit cycle, with mitigation required at 4.0 pCi/L or higher. Lenders, insurers, and daycare licensing reviewers increasingly ask about radon too, so a documented answer is becoming part of normal building ownership here.

How Multifamily Testing Differs

You do not need to test every unit in an apartment building, but you cannot test just one either. Standard multifamily protocols call for testing a representative set of units, with an emphasis on ground-contact units, since that is where radon enters. Which units, how many, and for how long depends on the building layout, foundation type, and what the results will be used for.

Financing raises the bar. HUD requires radon testing on financed multifamily deals, and the testing protocol, the percentage of ground-contact units sampled, and the reporting format all have to satisfy the lender's environmental reviewer. We plan the unit sample, coordinate access, and deliver reports formatted for that review, so a missing data point does not stall a closing.

In a university rental market, timing matters as much as protocol. Tests need closed-building conditions and cooperative tenants, which is easier to arrange in some parts of the lease calendar than others. We schedule around turnovers and give tenants clear written notice of what the test is and what it requires of them, which keeps disruption and complaint calls to a minimum.

Mitigation Design for Large Slabs

A single-family radon system usually needs one suction point and one fan. A commercial slab is a different engineering problem. Larger footprints, thicker slabs, footings that divide the sub-slab space into separate zones, and compacted fill that resists airflow all mean one pipe in one corner will not depressurize the whole building.

Good commercial design starts with pressure field extension testing. We drill small test holes across the slab, apply suction at a candidate location, and measure how far the negative pressure field actually reaches. Those measurements, not guesswork, determine how many suction points the building needs, where they go, and what fan capacity each one requires.

The systems themselves follow the same principles as residential active sub-slab depressurization, scaled up: multiple suction points tied into higher-capacity fans, discharge pipes terminating above the eave line, u-tube manometers or pressure gauges at each fan for at-a-glance verification, and sealed sump pits, floor drains, and slab joints so the fans pull from the soil instead of from conditioned air. Crawl-space areas get sub-membrane depressurization under a sealed liner.

Routing matters more in commercial work. Pipe runs have to respect fire separations, tenant spaces, and the look of the building. We plan runs through mechanical rooms, chases, and exterior walls where possible, and we coordinate with your maintenance staff so the finished system is something they can monitor and service.

Working Around Tenants and Business Hours

Most of our commercial work happens in occupied buildings, and we plan for that from the first site visit. Core drilling and pipe installation are scheduled in blocks that suit the property, whether that is business hours in vacant suites, early mornings before a daycare opens, or coordinated unit-by-unit access in an apartment building.

For residential tenants, we provide notice templates the property manager can send, keep work inside each unit to a single visit wherever possible, and leave spaces clean. For businesses, we stage work to keep exits, corridors, and customer areas open. Dust control and noise windows are agreed on in advance, not negotiated on the day.

Property managers get a single point of contact and a schedule they can forward to tenants. Our goal is that the only lasting evidence of the project is a quiet fan, a manometer reading where it should be, and a set of passing test results.

Documentation for Lenders, Insurers, and Regulators

In commercial radon work, the paperwork is half the product. Every project we do produces a file you can hand to whoever is asking: unit-by-unit or space-by-space test results with dates and device types, the credentials of the certified professionals who did the work, system design drawings, post-mitigation verification results, and maintenance instructions.

That file answers lenders on HUD and conventional multifamily deals, insurers doing risk reviews, the city on rental permit questions, and licensing agencies for daycares and similar facilities. It also protects you later: if a tenant or buyer raises radon years from now, you have contemporaneous records showing the building was tested and, where needed, mitigated by state-certified professionals.

We keep copies of everything we produce, so if a document goes missing during a sale or refinance, a replacement is an email away.

Duty of Care for Employers, Property Managers, and HOAs

If people spend forty hours a week in your building, their radon exposure there is a workplace health question, and it is one of the cheapest ones to answer. Testing an office or shop costs little, and if levels are elevated, mitigation is a one-time capital fix rather than an ongoing expense. Employers who test and document are in a far better position than those who never asked.

Property managers carry the same logic across a portfolio. A standing radon program, testing on a defined cycle, mitigating where needed, and retesting mitigated buildings every two years per EPA guidance, turns radon from a recurring scramble into a line item. We run programs like this for managers with buildings across Johnson County.

Condo associations and HOAs sit in between: the slab and the systems are usually common elements, while the exposure happens in private units. We help boards test common-element foundations, interpret results across ground-contact units, and plan mitigation as a common expense with documentation each owner can keep.

Our Phased Approach: Assess, Test, Design, Install, Verify

Commercial radon projects go wrong when someone quotes a system before understanding the building, so we work in phases. First we assess: foundation type, slab zones, mechanical systems, occupancy, and any prior test history. Then we test to the protocol your situation requires, whether that is a rental permit, a HUD deal, or simple due diligence.

If results come back under 4.0 pCi/L, the project ends there with documentation, and we tell you so. If mitigation is needed, we design from pressure field measurements, quote the actual scope, and install on a schedule built around your tenants and hours.

Every install ends with verification testing to confirm the system performs, plus a walkthrough with your maintenance staff covering the manometers, the fans, and what a failure looks like. Call us or send the form below to talk through your building, and we will lay out exactly what an assessment would involve.