leaglly, a landlord has to provide working bathroom and kitchen, aka plumbing, as that is what it makes it habital, even if there is an agreement about repairs.
I just had to pay for about 50 feet of sewer drain to be replaced because it was cracked and started to leak. If the tenant had dropped something on it or ran over it with a car then they would have been responsible for the repairs. as it turned out, it was just old pipe.
if my tenant flushed something down the drain and plugged the sewer, they would also have to pay for repairs. If the let pipes freeze in the winter, also they would have to pay for repairs.
but the fact the tenant did nothing to cause the problems, the landlord has to get it fixed right away or pay for a hotel room until it is fixed.
I have paid to put a tenant up in a hotel before, so I know that is so.