Does Water Damage Affect Granite or Stone Countertops?

Granite and other natural stones are porous, meaning they can absorb water if the sealant wears off or if the stone is left wet for long periods. A small spill wiped up right away usually causes no harm. But standing water from a leaky faucet, a dishwasher overflow, or a slow pipe leak can seep into the stone and the seams where pieces meet.

Once moisture gets into the pores, it can carry dirt and minerals that leave dark stains or a dull film. In humid climates, trapped moisture can also create an environment where mold and mildew grow. The stone itself rarely cracks from water, but the underlying wood or particleboard base can swell and warp, which affects the countertop's stability.

• Wipe up spills immediately with a soft cloth
• Check the sealant on your stone countertops regularly
• Look for dark spots or a change in texture after water exposure
• Inspect the area under sinks and around faucets for leaks
• Keep the countertop dry after cleaning, especially near seams

Your first step is to stop the water source. If it's a leaky pipe or appliance, shut off the water supply to that area if you can. Then remove any standing water with towels or a wet vacuum, being careful not to spread it. Open windows or use fans to help the area dry, but avoid using heat, which can cause the stone to crack.

For stubborn stains, a poultice made of baking soda and water can sometimes draw out the moisture, but test it on a hidden spot first. Do not use harsh chemicals or abrasive scrubbers, as they can damage the stone's surface. If the water has reached the seams or the base underneath, it's wise to have a professional inspect the extent of the damage, as hidden moisture can cause long-term issues.

Regular maintenance is the right way to protect your granite or stone countertops. Reapply a stone sealer every one to two years, or as recommended by the stone supplier. This helps close the pores and makes the surface more resistant to water. Also, wipe up spills promptly and dry the countertop after cleaning to avoid standing water.

Check the plumbing under your sinks and the seals around your faucets for any signs of wear. In humid climates, like Port St. Lucie's hot rainy summers, moisture can be a constant presence, so staying vigilant is important. If you notice any soft spots, discoloration, or unusual smells, address them early. A little prevention goes a long way in keeping your stone countertops looking good and functioning well for years.