This is another post on the subject of infrastructure failure. This will deal with the sewer systems. If you are on a septic tank, you will probably not have problems. However, people who live in more urban areas can have a nasty problem. Depending on where you live, you may have a risk of other people’s sewage backing up into your home.
For instance, I am aware of low-lying areas in which the sewage has to be pumped up hill to get to the treatment plant. If you live in a low-lying area that is dependent on pumps and the people above you continue to use their system after the power has failed you should have a plan to plug your sewer line. From my own study of the sewer system, this is more prevalent in some communities than one might suspect. The more hills you have in your area the more likely this is to occur.
If you live in large apartment buildings especially high rises, you may have a similar problem. This could be bad enough to force you to leave. If you live in an area where this could affect you, learn about how you would be impacted. Something as simple as a bag of Ready Crete cement could save you a giant mess. Knowledge can be power.