A classic sign is when using one fixture causes a backup in another. For example, flushing the toilet might cause water to rise in your shower drain.
To avoid a recurring nightmare, follow the "3 P’s rule": Only flush P ee, P oop, and toilet P aper. Avoid pouring grease down drains, and consider a yearly professional inspection if you live in an area with mature trees.
[e.g., "Tenants in Unit 2 were advised not to use sinks until repair completed."]
: Water backing up in the shower or tub when you flush the toilet .