Minor water leaks in walls can cause mold growth over time. Mold needs a source of moisture and organic material to grow, and a small water leak in a wall can provide both of these things. The leak can also cause damage to the wall, making it easier for mold to take hold.

Mold growth can occur within 24 to 48 hours if the conditions are favorable and can spread rapidly. Even small leaks can lead to serious mold problems if they are not addressed quickly.

It's important to keep an eye out for potential water leaks in walls, such as discoloration or staining on the wall, a musty odor, or peeling or cracking paint. If you suspect a water leak, it is important to have it inspected and repaired by a professional as soon as possible to prevent mold growth. Additionally, regular check-ups of your home, especially in humid areas, can help prevent mold from growing in the future.