I have a toilet in my basement(below ground level, that I might replace in the future, but is loose. After a recent heavy rain, when we ran the washing machine, water came from the bottom of the toilet and flooded the basement floor. Would a plug in the drian hole solve this, or do I have to reseal it somehow?
Since the upstairs toilet drain fine, as well as the tub, I'm assuming it's not a big backup in the sewer, but how would I be sure?
Thanks you