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The house is 20 years old. Is it an emergency repair required guys? Is the pipe strong enough? The house is due for sale in a couple of months and I am thinking seriously if I really want to break the wall.

prashster, I have no idea how the sewage pipe looks like in the basement. What makes the diagnose even harder is that the basement is finished so I may have to break the wall in order to see what's going on there.

I hear only one loud bang right after all the water went down the drain. I suspect it's the drain pipe down in the basement. The noise is happening before the valve closes so it is not likely water hammer. Also the other toilet on the same floor makes the same noise and I noticed some not as...

Thank you Mike. I checked the toilet (shut off the valve before flushing) and I still get the bang. Now, I notice the bang on the other toilet on the same floor and also banging noises (not as loud) when the tap water is running on the sink beside the toilet. drain problem maybe? I am planning...

After I flush the toilet and the water went down the drain, a few moments later I hear a loud banging noise from the basement. I did some reading and it is suggested that I may have a water hammer. However the water hammer is normally associated with a closing valve which is not the case here...