Best way to notify schools of “drop dead” decision date when waitlisted?

Hey everyone,

I am currently accepted and enrolled at a school out of state which I plan on attending in the event I am not admitted off of 1 of 3 waitlists I currently remain on in my home state. I really don’t want to come off as a bother / pushy so how would you let the admissions department know that you need to make a decision by a certain date? I really do not want to jeopardize my chances at these schools but at the same time I need an answer.