Are commercial buildings required to test for radon in Georgia?

Georgia does not have a statewide mandate for commercial radon testing. However, the EPA recommends testing all ground-contact buildings, and some federal agencies require testing for buildings they own or lease. Schools receiving federal funds may have radon testing recommendations under the Indoor Radon Abatement Act. Property owners and employers may also face liability exposure if they fail to test and occupants are later found to have been exposed to elevated radon.

How is commercial radon testing different from residential?

Commercial testing uses the same measurement technology (continuous radon monitors or alpha track detectors) but requires different protocols. Commercial buildings are typically larger, may have multiple zones, and have different occupancy patterns than homes. Testing should cover all ground-contact rooms used regularly, and measurements need to account for HVAC operating schedules and building pressurization. Commercial testing usually involves more test devices and a more detailed assessment report.

How much does commercial radon testing cost?

Commercial radon testing costs depend on building size and the number of test locations needed. A small commercial space (under 2,000 sq ft) might cost $300-500 for a single-zone test. A school with 20 ground-floor classrooms might cost $2,000-5,000 for comprehensive testing. Multi-story office buildings typically need testing only on ground-floor and basement levels, which limits the scope and cost.

Can radon affect upper floors of a commercial building?

Radon concentrations typically decrease with height above ground level. In most commercial buildings, significant radon levels are limited to basement and ground-floor spaces. However, buildings with shared HVAC systems that draw air from ground-level or below-grade areas can distribute radon to upper floors. Elevator shafts and utility chases can also act as pathways for radon migration between floors.

Commercial Radon Testing Guide: Schools, Offices & Multi-Unit Buildings

1. Why Commercial Buildings Need Radon Testing

Radon enters buildings through the same mechanism regardless of whether the building is a home or an office. Soil gas migrates through the foundation and accumulates indoors. If a building sits on soil that produces radon, and the building has ground contact, radon can be a concern.

The health risk applies to anyone spending significant time in the space. An employee who works 40 hours per week in a ground-floor office with elevated radon is getting substantial cumulative exposure. Children in a school or daycare spend 6-8 hours per day, five days a week, in the same building.

Metro Atlanta sits on the Piedmont granite belt, which produces radon throughout the region. Commercial properties are on the same geology as residential properties. The same zip codes that show elevated residential radon will also affect commercial buildings. Check your building's area with our radon risk lookup.

2. Which Buildings Are at Risk

Not every commercial building needs radon testing. The key factor is ground contact and occupancy time:

Building Type	Risk Level	Testing Priority
Schools (ground-floor classrooms)	High priority	Strongly recommended
Daycares and childcare facilities	High priority	Strongly recommended
Ground-floor offices	Moderate	Recommended
Basement-level retail/restaurants	Moderate to High	Recommended
Multi-story buildings (upper floors only)	Low	Optional
Warehouses (low occupancy time)	Low	Optional

3. Testing Protocols for Commercial Properties

Commercial radon testing differs from residential testing in several ways:

Test Placement

For commercial properties, each regularly occupied ground-contact room should have its own test device. Unlike residential testing where one device in the lowest livable area is sufficient, commercial buildings need multi-point testing because HVAC zones, construction materials, and floor plans create different radon conditions in different areas of the same building.

Test Duration

The EPA recommends either short-term testing (2-7 days with CRM devices) or long-term testing (90+ days with alpha track detectors) for commercial buildings. Alpha track detectors are the most common choice for schools because they are inexpensive, unobtrusive, and do not require electricity, making them practical for deploying across many rooms simultaneously.

HVAC Considerations

Commercial HVAC systems significantly affect radon levels. Testing should occur during normal HVAC operation (not during shutdowns or maintenance periods) to reflect actual occupant exposure. If the building's HVAC is shut down on weekends, testing that includes a weekend may show artificially elevated readings for those hours.

4. Schools and Daycares

Schools and daycares deserve special attention because children are more vulnerable to radon exposure than adults. Their lungs are still developing, they breathe more rapidly relative to body weight, and they have more years ahead for cumulative damage to manifest as cancer.

EPA School Testing Guidelines

Test every frequently used room in contact with the ground

Include classrooms, offices, libraries, cafeterias, and gymnasiums

Test during the school year when HVAC operates normally

Retest every 5 years or after significant building modifications

Georgia School Testing

Georgia does not mandate radon testing in schools. The Indoor Radon Abatement Act of 1988 directed the EPA to develop school testing guidance, but compliance is voluntary. Some Georgia school districts have conducted testing programs, but many have not. Parents and administrators can advocate for testing by citing EPA guidance and the documented health risk to children.

5. Office Buildings and Workplaces

Office workers in ground-floor or basement-level spaces can accumulate significant radon exposure. A full-time employee spends roughly 2,000 hours per year in the workplace. If radon in that workspace averages 6 pCi/L, the cumulative exposure adds meaningfully to their lifetime risk.

Employer Considerations

OSHA does not regulate radon in most workplaces. OSHA's permissible exposure limit for radon applies to specific industries (mining), not typical offices. However, the general duty clause requires employers to maintain a safe workplace, which could include addressing known radon hazards.

Employee awareness is increasing. As more people become aware of radon risk, employees in ground-floor spaces may request testing. Proactive testing by employers demonstrates responsibility and avoids potential liability.

Lease agreements. Commercial tenants should consider requesting radon testing as part of their lease negotiation, similar to requesting environmental assessments. Landlords may be willing to test or share existing test data.

6. Liability and Legal Considerations

Commercial property owners and managers face potential liability related to radon:

Duty of care. Property owners who know or should know about environmental hazards have a general duty to address them. Radon is a well-documented carcinogen. Failing to test a ground-contact building in a known radon area could be seen as negligent.

Real estate transactions. Commercial property sales may include environmental due diligence that should encompass radon, particularly for ground-floor and below-grade spaces.

Insurance implications. Some commercial insurance policies may have provisions related to environmental hazards. Testing and mitigating radon demonstrates risk management that could be favorable for coverage terms.

7. Commercial Mitigation Options

Commercial radon mitigation uses the same principles as residential mitigation but on a larger scale:

Sub-slab depressurization is the most common approach. Multiple suction points may be needed for large floor areas. Higher-capacity fans may be required to create adequate suction across the full slab.

HVAC modifications can supplement active mitigation. Increasing fresh air intake, balancing supply and return air, and ensuring positive pressure in occupied spaces all help reduce radon levels.

Sealing foundation cracks, expansion joints, and utility penetrations reduces radon entry points. In commercial buildings, slab-to-wall joints and elevator pit drains are common entry points.

Commercial mitigation costs vary widely based on building size and complexity. Small commercial spaces may cost $2,000-5,000. Large facilities with multiple zones may cost $10,000-25,000+. Use our cost estimator as a starting reference point.

Commercial Radon Testing: Schools, Offices & Multi-Unit Buildings