#1. An Interior Plumbing Leak
This may seem like a no-brainer, but you should always check for inside leaks first when trying to identify the cause of moisture in your basement. A water leak can come from numerous places: a shower, a sink, a toilet, a washing machine, a dishwasher, a bad pipe, just to name a few. Sometimes, if the moisture in your basement is located on the ceiling or walls beneath a bathroom or kitchen, an interior water leak is to blame. Find where the moisture is located and determine if something in that area is leaking.
