What are the disadvantages of septic tanks?

More Pros than Cons if you are looking into one.

Require minimal maintenance if cared for properly and need only to be cleaned out once every 3-5 years. Costs about $300-$600 to clean out. Just be sure the size is approved for the size of the house and the leach field is in the proper place.

You must also use Septic Safe TP.

City Sewers have a pipe leading from the road to your house. If this breaks, you are responsible. If it leaks, you are responsible. If it DOES leak, it will take your house to start sinking before they realize it. If there is some sort of natural or unnatural disaster, the sewer lines may back up into the houses.