The answer to 'soffit water stains' is that they are often caused by leaks or improper ventilation in the roof system. Symptoms include visible water stains or discoloration on the soffit (the underside of the roof overhang), and can indicate more serious issues like roof leaks, clogged gutters, or inadequate attic ventilation.
In many cases, soffit water stains can be addressed through DIY repairs, such as sealing cracks, cleaning gutters, or improving attic ventilation. However, if the stains are severe or the underlying cause is not readily apparent, it's best to call in a professional roofing contractor to inspect the roof and soffit and recommend the appropriate solution.