cliff notes version: i'm about to buy a house, did a home inspection that revealed a wet spot on the basement perimeter wall, but we were unable to determine source. any ideas? longer version: i put in an offer to buy a house, and we had a ratified contract within a couple of days. so yesterday, during the home inspection i noticed a water stain on the basement wall (see small pic below). the inspector used a little tool to determine it was indeed wet. the areas above, left, right and floor trim were tested with the tool and came out dry. he didn't test the carpet, but it felt dry. it had rained heavily for about 1-2 hours the day before. what confuses me, and confused the inspector and my realtor who was there, is that it's the outer perimeter wall that faces a significant slope that goes away from the house. BUT, about 6" of ground closest to the house is actually sloped slightly inward towards the house. could this very, very minor inward slope be causing water to seep into the foundation? if so, why wasn't the carpet soaking wet? maybe the carpet pad soaked up most of the water before the carpet could soak it up? so i went back and looked at the stock photos they included in the sales listing. and lo and behold, there's the same water stain! (see larger pic below) so it's obviously been there for several weeks at least, and possibly several years as they simply repaint over the same stain over and over. so, any ideas fellas? also, it's the outer perimeter wall, so there are no water pipes (or shouldn't be) in that wall.