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Do granite countertops give off radon?

By Radon411 Editorial TeamUpdated October 1, 2026How we research

Short answer

Granite can give off some radon, since any granite can contain uranium, but building materials rarely cause radon problems by themselves, and levels from granite are not typically high. The soil under a house is the principal source of radon in homes, so test the air to know your level.

Next step: a test is the only way to know your home's level. How to test your home

Any granite sample can contain varying concentrations of uranium and other naturally occurring radioactive elements, and some granite used for countertops may contribute variably to indoor radon levels. At this time, the existing data is insufficient to conclude that the types of granite commonly used in countertops are significantly increasing indoor radon levels.

In the United States, radon gas in soils is the principal source of elevated radon levels in homes, and building materials rarely cause radon problems by themselves. Some building materials also can release low levels of radon.

There is no generally accepted radiation testing protocol for countertops. A home radon test measures the air you breathe, whatever the source, and testing is the only way to know your level.

What to do next: test the lowest lived-in level of the home with a of at least 48 contiguous hours under , and read the result with the interpreter.

Granite can give off some radon

Granite is a naturally occurring igneous rock, formed by the cooling of molten rock, and any granite sample can contain varying concentrations of uranium and other naturally occurring radioactive elements. Some granite used for countertops may contribute variably to indoor radon levels.

Granite countertops and radon: what is known
Question	Answer
Can granite contain uranium?	Yes, in varying concentrations
Can a countertop add radon?	Some granite may contribute variably to indoor radon
Are levels from granite usually high?	Not typically high
Are common countertop granites shown to raise indoor radon significantly?	The existing data is insufficient to conclude that

The soil is the main source

In the United States, radon gas in soils is the principal source of elevated radon levels in homes. The principal source of radon in homes is the soil in contact with basement floors and walls, and building materials rarely cause radon problems by themselves.

Cross-section drawing of a house with a basement and a crawl space, numbered at the seven ways EPA lists for soil gas to get in: cracks in solid floors, construction joints, cracks in walls, gaps in suspended floors, gaps around service pipes, cavities inside walls, the water supply. — Soil gas, the main source of indoor radon, enters through the foundation.

A building's radon level depends on factors including the local geology and the radon given off by its building materials. See where does radon come from.

Testing a countertop versus testing the air

There is no generally accepted radiation testing protocol for countertops, and granite products do not require radiation testing. Radiation concentrations can only be measured with sophisticated portable instruments or laboratory equipment.

What each kind of test tells you
Test	What it measures	Who
Home radon test kit	Radon in the room's air, whatever its source	You, following the kit's instructions
Radiation measurement of a countertop	Radiation from the stone itself	A specially trained radiation professional

Home test kits are not designed to measure radon from a countertop, but if you are concerned about the radon level in your home, use one as instructed: it measures the air you breathe.

What to do if you have granite

To reduce your radon risk, first test the air in your home. Test the lowest lived-in level, as for any home; testing is the only way to know if you and your family are at risk. If the level is high, the usual fix draws soil gas from beneath the house, since soil is the main source.

Granite in perspective

Radon levels attributable to granite are not typically high, but there are too many variables to generalize about the risk inside a particular home with granite countertops. What is known is where most radon comes from, and how far it can be brought down: commonly used can reduce the radon coming from the soil beneath a home to 2 or less in most homes.

Sources of radon in a home, in proportion
Source	Contribution
Soil under and around the house	The principal source of elevated radon in homes
Granite and certain concrete products	Can give off radon in a small number of homes
Building materials in general	Can release low levels; rarely cause problems by themselves

When a specialist helps

When a home's radon problem is being diagnosed, a specially trained radiation professional may be able to test for other radon sources, such as granite, alongside soil gas. Some types of granite may also emit gamma radiation above typical background levels, which only such instruments measure.

Questions about granite and radon

Do granite countertops cause radon?

Some granite may contribute variably to indoor radon, but the soil is the principal source, and building materials rarely cause radon problems by themselves.

Should I remove my granite countertops?

Test the air first. The existing data is insufficient to conclude that common countertop granites significantly increase indoor radon.

Can I test my countertop for radon?

There is no accepted testing protocol for countertops. A home radon test measures the air, which is what you breathe.

Do quartz or marble give off radon?

Building materials in general rarely cause radon problems by themselves. Test the air to know your level.

Is granite radiation dangerous?

Levels from granite are not typically high, though some types may emit gamma radiation above typical background levels.

Can radon from granite be fixed?

Test first. Commonly used mitigation can reduce the radon from the soil beneath a home to 2 pCi/L or less in most homes, and soil is the main source.

Where does most indoor radon come from?

The soil in contact with basement floors and walls.

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