Of course, we’re inclined to say that nearly all plumbing issues should get fixed ASAP so you won’t run up astronomical utility bills or have severely damaged pipes or other parts in the long run.  However, don’t hesitate to call a professional plumber when you’re dealing with major repairs such as a septic tank or sewer clogs, as they can seriously compromise your health if not addressed right away.  The same applies to busted or suddenly leaky pipes that could cause flooding.