Sump pumps are used in basements to remove water and moisture which could cause damage to the basement.
Sump pumps are connected to an outside hose which drains the water out to the yard.
The pumps should never connect into the sewer systems, this is actually illegal.
If you have a leaky basement or a damp musty smell in the basement, and there is no sump pump, you might consider having one installed to clear up the problem.
This is not a job you would typically want to do yourself. Installation of a sump pump requires time and experience to do the job correctly. A professional plumber will have all the tools and supplies to properly install the sump pump(s) so that they meet code restrictions and guidelines.
A sump pump will clear up the musty smell and dampness in the basement.
A sump pump is wired into the home’s electric system so it can operate whenever the sump pit fills up. In many cases, these pumps will also have a battery back up in case of a power failure.
If you have a sump pump that is not operating, you should contact a plumber. It may be that the pump itself has a problem or it may be as simple as a clogged drain hose outside.
Either way, someone with experience should assess the problem.