Bought a house 4 years ago. There was a 3-inch black pipe sticking up in basement that someone had put tape over and a piece of foam in the pipe. We thought it was existing plumbing for maybe a future bathroom in the basement. Three years later, we moved our washer and dryer upstairs, out from the basement, and tied the plumbing for it to that pipe in basement. ow, a year later, that pipe is backed up and we have put a 50 foot snake down, but there seems to be no clog. Could the pipe maybe not have been supposed to be used?

How old is the house ? Could it possibly be a radon pipe ? Are there any other pipes coming up thru the floor nearby, for maybe a tub or sink ?

50 feet an nothing ???
a sewer camera would be useless if the pipe is full of water. but a probe that goes into the pipe that can be located and followed from above ground would at least tell you what direction it is going and how far it runs..

built in 70s and the basement is a concrete slab no other pipes comin up



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Why would you have connected the washer to the pipe WITHOUT figuring out WHAT it was for? WE cannot tell you anything about it.