Do Quartz Countertops Give Off Radon?

Quartz countertops are popular options for kitchen and bathroom remodeling projects due to their durability, aesthetics, and low maintenance. However, some homeowners have concerns about potential radon gas emissions from quartz countertops. In this comprehensive guide, we will examine if quartz countertops give off radon, the health risks of radon exposure, testing methods, and steps you can take to minimize risks.

What is Radon?

Radon is a naturally occurring, radioactive gas that forms from the decay of uranium in soil, rock, and water. It is colorless, odorless, and tasteless. Radon gas can seep into homes through cracks in foundations and accumulate to dangerous levels.

The U.S. Environmental Protection Agency (EPA) identifies radon as the second leading cause of lung cancer after smoking. Radon exposure is estimated to cause over 20,000 lung cancer deaths per year in the U.S.

The main health risk from radon exposure is lung cancer. Radon can accumulate in indoor air and be inhaled. The radioactive particles can damage lung tissue and lead to lung cancer over time.

Do Quartz Countertops Emit Radon?

Quartz countertops are engineered stone made from crushed quartz bonded together with resin. Quartz itself does not contain uranium and does not emit radon. However, there has been some concern over trace levels of radiation detected in some quartz countertops.

The main source of radiation in quartz countertops is from granite fragments that are sometimes added to the mixture. Granite contains uranium and thorium, which can decay into radon gas. However, the trace levels detected are generally well below EPA safety limits.

According to the EPA and major quartz manufacturers, quartz countertops pose little to no health risk from radon. Emissions are negligible and no scientific studies have conclusively linked quartz countertops to dangerous radon levels in homes.

How Radon Enters Homes

While quartz countertops are unlikely sources, radon can still enter homes through other avenues:

  • Cracks or openings in foundations: Radon gas can seep up from soil and rock under home foundations. Any cracks, joints, or openings provide entry points.
  • Well water: Radon can dissolve and accumulate in groundwater sources. Using well water with high radon levels for showering and cooking can increase indoor radon levels.
  • Some building materials: Natural rock, granite, and concrete products can emit low levels of radon. However, building codes limit radioactive levels.
  • Natural gas appliances: Trace levels of radon can be released from some natural gas appliances. Proper ventilation helps mitigate this.

In most cases, the surrounding soil is the primary source of elevated indoor radon. Homes built on uranium-rich soils in certain regions are at higher risk.

Recommended Radon Levels

The EPA sets the following guidelines for radon exposure:

  • 4 pCi/L (picocuries per liter): Recommended indoor radon limit. Homes with levels at or above this should take mitigation steps.
  • 2 pCi/L: New home construction should aim for radon levels below this threshold.
  • 0.4 pCi/L: Outdoor ambient radon levels. Indoor levels below this are considered negligible risk.

These numbers refer to average long-term radon concentrations. Short-term fluctuations are normal.

Testing for Radon in Your Home

The only way to know your home’s radon levels is to test. Here are some tips:

Use certified test kits

Choose professional radon test kits that meet EPA requirements. Look for kits certified by the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).

Follow instructions carefully

Carefully read and follow all instructions for proper setup, placement, timing, and return shipping. Mistakes can invalidate results.

Test in the lowest lived-in level

Test kits should be placed in the lowest level of the home suitable for occupancy, such as a basement. This is where radon accumulates most.

Conduct closed-house conditions

Keep all windows and doors closed 12 hours before and during the test for accurate results (except for normal entry and exit).

Test for minimum 48 hours

EPA recommends a minimum 48-hour test. Longer 3-7 day tests provide a more accurate average radon level.

Take multiple tests

Take a follow-up test if your initial result is at or above 4 pCi/L. Averages from multiple tests provide a more reliable radon level.

Consider professional testing

Hiring a certified radon professional to conduct testing ensures proper procedures are followed.

How to Reduce Radon Levels in the Home

If radon levels are confirmed to be 4 pCi/L or higher, take steps to mitigate radon. Here are some effective solutions:

Sealing Cracks and Openings

Sealing all cracks, joints, and openings in the foundation can prevent radon entry. Use caulk, expandable foam, concrete, or other seals. Pay particular attention to openings around pipes, wires, sump pits, and drains.

Active Soil Depressurization (ASD)

ASD uses a system with a vent pipe, blower fan, and seals to draw radon from below the home and vent it outside before it can enter. It is extremely effective at reducing high radon levels.

Improving Ventilation

Increasing under-slab and soil ventilation can disrupt radon flow into the home. Passive vent pipes and crawlspace vents help improve air flow. Active fans can enhance ventilation.

Filtration Systems

High-efficiency HEPA filters can remove radon from indoor air. They are less effective at reducing the source but provide an extra layer of protection.

Home Pressurization

This prevents radon ingress by maintaining higher indoor air pressure. Fresh outdoor air dilutes indoor radon. Strategic use of HVAC systems or dedicated air supply fans pressurize the home.

Water Treatment

Radon water filtration systems using granulated activated carbon effectively remove radon from well water before it enters the home.

FAQs About Quartz Countertops and Radon

Do all quartz countertops emit radon?

No. Pure quartz does not release radon. Trace emissions some countertops give off are from granite filler, not quartz. Most quartz countertops on the market meet EPA safety standards.

Is radon only a concern for countertops made with granite?

Natural granite countertops have slightly higher radon emissions than engineered quartz. But EPA testing confirms radiation from both materials are well below dangerous levels with proper ventilation.

Should I get my quartz countertop tested for radon?

Current evidence does not suggest quartz countertops are significant radon sources. Home radon tests also cannot accurately measure emissions from a small surface. Whole-house testing of overall indoor radon levels is more useful.

Do granite or marble countertops emit more radon than quartz?

Some natural stone countertops like granite and marble have slightly higher radon emissions due to natural uranium content. However, this does not mean they are dangerous. EPA studies show their radiation is negligible for indoor health risks.

Should I seal my quartz countertop?

Sealing is not necessary for radon reduction in quartz countertops, since emissions are already well below EPA limits before sealing. Sealing may provide other benefits like resisting stains. But it will not significantly reduce radon.

Can quartz countertops cause cancer?

There is no scientific evidence linking quartz countertops to increased cancer risk. Due to their low radon levels, EPA and major quartz brands confirm quartz poses negligible health risks. Any radon exposure would be far lower than from other common sources.

The Bottom Line

While radon exposure poses health risks, quartz countertops are very unlikely to significantly increase exposure. Radon emissions from quartz are well below EPA safety thresholds in all tested materials. The natural uranium content and radon levels are too low to be a health hazard. Still, it is smart to test your home’s radon levels for overall indoor air quality and peace of mind. If found to be high, a qualified radon mitigation professional can help identify and seal radon entry points in the foundation and soil. With proper home testing and radon-reduction strategies, you can enjoy beautiful and safe quartz countertops with confidence.


After reviewing the scientific data, quartz countertops pose little to no risk for dangerous radon exposure and related health effects. While radon is a serious health hazard, quartz itself does not emit the gas, and only trace levels detected are from granite fillers, not the quartz. EPA studies confirm emissions are far below hazardous levels. Overall indoor radon, water, and soil are much more significant sources than quartz surfaces. Following EPA radon guidelines, testing home levels, and mitigating high results are wise safeguards. But specific testing or sealing of quartz countertops is unnecessary to minimize radon risks. Homeowners can choose quartz countertops with peace of mind that they do not endanger health with radioactive radon. With proper precautions to identify and reduce any elevated environmental radon, beautiful quartz can be enjoyed safely.