Action Plan for Main Sewage Line Failure Wanted

[Ryan PRice]

Does anyone have a suggested action plan in the event of a main sewage line emergency?   For older rentals this is something I would love to have a plan for, should the water ever stop draining due to a blockage/break/collapse  (or worse- a backup into the house) of an old underground main sewer line. 

I'm not even sure who I should contact first (plumber, specialty sewer line company, the city utility or permit office, exaction company etc), nor am I sure of the best course of action to reduce the inconvenience to a tenant. 

  I bet plenty of you have gone through such an ordeal and wished you had a plan in place beforehand....For those in the know, your input in having a plan in place for such an issue would be much appreciated.