What Is a Porous Surface? Porous vs. Non-Porous Countertops Compared

A porous countertop has microscopic openings in its surface where liquids, oils, and bacteria can settle if given the chance. These openings come from how the material formed. Natural stone cools, compresses, and crystallizes underground over millions of years, and that process leaves tiny gaps between mineral grains.

Those gaps are not visible to the naked eye in most cases, but they are there, and they determine how a countertop behaves in daily use. At our design center in Somerset, we walk homeowners through this distinction constantly because it affects far more than looks. It shapes how a countertop is cared for and how it holds up over years of cooking, entertaining, and everyday spills.

Granite and Quartzite: Beautiful, Natural, and Porous

Our granite countertops and quartzite countertops are both quarried from the earth, and both are naturally porous. Granite forms from cooled magma or lava, while quartzite begins as sandstone that gets transformed by heat and pressure over time. The result in both cases is a dense, hard surface with small pores scattered throughout.

Because these stones are porous, a sealer is applied to help resist staining. The sealer fills the pores near the surface so liquids bead up instead of soaking in. It does not make the stone impervious, and the degree of porosity varies from one slab to the next depending on the color and mineral makeup.

Pro Tip: Darker, busier granite patterns tend to hide the natural pits and fissures that come with a porous stone far better than lighter, more uniform slabs.

Quartz: An Engineered, Non-Porous Alternative

Quartz is a different story entirely. Our