On the Level: Why is that smelly water seeping from my shower wall?
We have a problem in our shower stall. After the shower is used, a small amount of water -- maybe a couple of ounces — slowly wells up from about a dozen different points where the tile floor and wall meet and meanders down to the drain. These leaks are scattered around all four wall/floor joints. The water is foul-smelling, like stagnant water.
Source: capitalgazette.com