mold behind drywall near plumbing
https://wiki-triod.win/index.php/Finding_Mold_Behind_Drywall_After_a_Plumbing_Leak:_A_Real_Case_Study_from_Gateway_Water_%26_Mold
When you catch a whiff of mustiness near a wall, especially around a bathroom or kitchen, it's often a sign that moisture is seeping through the drywall and feeding mold behind it. I found this out the hard way after a slow leak in a plumbing pipe went unnoticed for months. The mold was thriving in that damp, dark space between the drywall and the studs, hidden from sight until we opened it up during a renovation. It's a common problem where water pipes run through walls, and if you don't addre…