My basement flooded the other day. I quickly came to realize that when the washing machine drained it came up through the black pipe that was coming out of the ground under the hot water heater. This is not attached to the hot water heater but I guess its there acting as a drain. The washing machine and hot water drainage pipe are no more than 10 feet away from each other. My thinking is that the drainage for the washer got clogged and is coming up through the drain of the hot water heater as they are attached. It only happens when the water is on spin cycle draining the water. How would I go about freeing this clog up? Run a drain snake through there? Any other ideas or suggestions??? Any would be much appreciated.

[b]Leak in finished basement coming from under the wall (directly below first floor bathroom).[/b] [b]Wall is not wet, ceiling is not wet. Recessed lights, however, are flickering, but no evidence of water near them.[/b] [b]What I did:[/b] 1 - Replaced faucet to make sure leak was not at faucet. [b]Other info:[/b] 1 - just replaced toilet flapper and toilet fill valve in tank 2- also just snaked out a clog in the bathtub - pulled up a little hair but was surprised that I didn't pull up much more. 3 - leak is a gushing leak that happens once and a while (maybe a gallon of water at a time); however, when I tested sink, tub, shower, leak did not happen immediately or even soon after. [b]What I will check today:[/b] 1 - supply line to toilet. 2 - shower knob stems. [b]My questions:[/b] [b]1 - [/b]Why is leak coming from under wall and no other wetness? 2 - What else should I be checking? [b]Thanks!![/b]