The answer to 'why is my soffit water stains' is that water stains on your soffit are typically caused by a leak or moisture issue in your roof or siding system. Common causes include improper installation, damaged or deteriorating materials, or poor ventilation.
Symptoms of a soffit water stain issue may include discoloration, peeling paint, mold or mildew growth, and even rotting wood. It's important to address the root cause quickly to prevent further damage to your home's structure and interior. In some cases, the solution may be as simple as caulking or sealing a gap, while more serious issues may require replacing damaged materials or improving ventilation.