The answer to 'why is my countertop water damage' is that water damage on countertops is usually caused by prolonged exposure to moisture. This can happen from spills, leaks, or high humidity that goes untreated. Symptoms include discoloration, warping, cracking, or a softening of the surface.
To fix water-damaged countertops, you'll need to identify and address the source of the moisture first. Small surface stains may be treatable with a sealant or polish, but deeper damage often requires professional repair or replacement. If the damage is extensive, it's best to call in a countertop repair specialist to evaluate the issue and provide the appropriate solution.