Does OSHA Require Radon Testing at Work? Georgia Employer Duties

1. Is radon an OSHA workplace issue?

Most people think of radon as a home problem, something a buyer worries about during an inspection. That framing misses where many adults spend the rest of their indoor time, which is at work. An office, a shop, a warehouse, or a clinic can pull radon from the soil the same way a house does, and the people inside breathe it for hours every day, week after week.

So radon is squarely a workplace question. The federal agency most people associate with workplace safety is OSHA, and the federal agency most people associate with radon is the EPA. Neither runs a program that mails employers a radon testing form, but both have a role here. OSHA frames employer responsibility through its general duty clause, and the EPA sets the action level that nearly everyone uses to decide when a reading is too high. This article walks through how those two third-party authorities apply to a Georgia workplace.

2. Where radon collects in a workplace

Radon is a colorless, odorless gas produced as uranium in soil and rock breaks down. It moves up through the ground and enters a building through cracks in the slab, gaps around pipes and utility penetrations, sump openings, and any other path where indoor air meets the soil below. Because the source is the ground, the parts of a workplace closest to it carry the highest risk.

In practice that means ground-floor offices, basements, lower-level break rooms and storage areas, slab-on-grade retail and shop floors, and any below-grade space where staff work long shifts. A basement records room, a ground-floor reception desk, or a workshop built on a slab can all accumulate radon. Upper floors are generally lower risk, but they are not automatically clear in buildings where elevator shafts, stairwells, and utility chases give soil gas a path upward.

3. OSHA's general duty clause and radon

OSHA does not publish a single standard that prescribes a radon testing schedule for every employer. Instead, the most relevant tool is the general duty clause, Section 5(a)(1) of the Occupational Safety and Health Act. In plain terms, it requires each employer to furnish a place of employment free from recognized hazards that are causing or likely to cause death or serious physical harm to employees.

Radon fits the description of a recognized hazard. It is a well-documented carcinogen, and the link between long-term radon exposure and lung cancer is not in dispute among health authorities. Where an employer has reason to suspect elevated radon, for example a ground-floor or basement workspace in a known higher-radon area, addressing it sits within that general duty. The clause does not hand you a number or a calendar, which is exactly why a documented test and a clear response are the sensible way to show the hazard was taken seriously.

4. A 40-hour week is real exposure

A full-time employee spends roughly 2,000 hours a year at work, most of it indoors and much of it in the same room or floor. That is a meaningful slice of total indoor time, and it is the reason workplace radon deserves the same attention a home gets. Radon risk is driven by cumulative exposure, so the hours add up: a person who works a basement office for years can take in a substantial dose even though no single day feels like a problem.

Health authorities consistently identify radon as a leading cause of lung cancer, second only to smoking, and the leading cause among people who have never smoked. The EPA and the broader public-health consensus treat long-term exposure as the concern, not a brief encounter. For an employer, that reframes the question from whether the air feels fine to whether the cumulative dose over a multi-year career is acceptable. The only way to answer that is to measure the level.

5. Why employers choose to test

Even without a prescriptive mandate, employers test workplaces for radon for several practical reasons. The first is duty of care. Looking after the people who work for you is the core reason, and a documented test plus a clear response is the most direct way to show that a known hazard was handled responsibly.

The second is liability and recordkeeping. If a question is ever raised, an employer who tested, kept the report, and mitigated where needed is in a far stronger position than one who never looked. A paper trail showing the level found, the system installed, and the post-mitigation result demonstrates the issue was identified and resolved rather than ignored.

The third is the transaction. Radon testing routinely comes up when a business buys a building, signs or renews a commercial lease, or goes through environmental due diligence as part of a property acquisition. A landlord may ask, a lender may ask, or the lease may already assign responsibility for indoor air. Testing ahead of these moments turns a potential sticking point into a settled fact. Our commercial radon testing guide covers the due-diligence side in more detail.

6. The 4.0 pCi/L action level

When a workplace test comes back, the number most people measure it against is the EPA action level of 4.0 pCi/L (picocuries per liter). It is the widely used third-party threshold for taking action on indoor radon, applied across homes, schools, and commercial buildings. A space that reads at or above 4.0 pCi/L is a candidate for mitigation, and the work is not considered done until a follow-up test confirms the level has come down.

It helps to be precise about what the action level means. It is the level at which action is recommended, not a sharp line between safe and dangerous. Radon risk is continuous, so a workplace reading just under 4.0 pCi/L still carries some risk, and the EPA notes that there is no level with zero risk. Some employers choose to address levels between 2.0 and 4.0 pCi/L when the cost is modest and the space is occupied for long hours. Rather than treat any single workplace number as settled fact, the sound approach is to measure, compare to this third-party benchmark, and act on what the results show.

7. How workplace radon testing works

Testing a workplace is not disruptive. Measurement devices are placed in the areas that matter most, which usually means ground-contact and lower-level spaces where staff spend time, and they sit undisturbed for a set period. A short-term test runs a minimum measurement window of a few days; longer-term measurements give a better average where readings are likely to vary across seasons. Work continues normally the entire time, and no one has to leave.

Larger buildings call for a sampling plan rather than a single device, because a sprawling slab or a building with several ground-contact zones can vary from room to room. After the measurement window, devices are retrieved, analyzed, and reported. If any area reads at or above the action level, mitigation usually means a sub-slab depressurization system sized for the building, followed by a retest to confirm the level dropped. For a deeper look at office-specific testing, see our guide to radon testing in office buildings, and our overview of commercial radon services.

8. Radon risk in metro Atlanta workplaces

Georgia does not have a state radon testing law, which leads some employers to assume radon is not a local concern. The geology says otherwise. On the EPA Map of Radon Zones, four metro Atlanta counties, Fulton, Cobb, DeKalb, and Gwinnett, are Zone 1, the highest category, meaning a predicted indoor average at or above 4.0 pCi/L. Several surrounding north Georgia counties also carry elevated designations tied to the region's granite and uranium-bearing bedrock.

For an employer with ground-floor or lower-level workspace in metro Atlanta, the combination of genuinely elevated regional radon and the absence of a state mandate is a reason to take the initiative rather than wait. Testing once gives you a clear baseline, and if the level is low you have a documented record showing the workplace was checked. If it is high, you have caught it early enough to fix it on your own timeline.

9. Frequently asked questions