The answer to 'why is my P-trap leaking water' is that a leaky P-trap is a common plumbing issue caused by a variety of factors, such as a worn-out seal, loose connections, or corrosion. The P-trap is the curved pipe under your sink that helps prevent sewer gases from entering your home. If it's leaking, it can lead to water damage, mold, and other problems.
Some common symptoms of a leaky P-trap include water pooling under the sink, a damp cabinet, or a musty smell. To fix a leaky P-trap, you may need to tighten the connections, replace the gasket or washers, or in some cases, replace the entire P-trap assembly. While some minor P-trap leaks can be DIY-friendly, it's often best to call a professional plumber, especially if the issue is more complex or involves water damage.