Engineered hardwood floors are designed to be as water-resistant as possible, and much more so than solid wood floors. But, as much as possible, engineered wood floors should not be exposed to water. Engineered wood flooring is made with thin composite layers of wood, which are specifically designed to counteract wood’s natural tendency to warp when exposed to water. This means that they do better in mildly damp locations, such as basements, than hardwood. But just like solid wood floors, engineered wood floors will develop mold if they are constantly exposed to water. Engineered wood floors are also usually finished with a water-resistant layer, so they shouldn’t immediately stain the moment that they make contact with water. However, water should be cleaned up off floors quickly. If it is allowed to sit, it will result in the same staining problems that you see with solid wood floors.