Came out to identify why sewage backed up into the home. Found cleanout outside with standing water. Flushed toilet inside and felt ground start vibrating. Dug around and found lift station lid underground. Opened lid to inspect pump. .4 hp zoeller sewage ejection pump. Spoke with homeowner who said original pump float switch went bad and they had to have it replaced. Appears that new float switch was installed too high in basin, allowing sewage to back up into line before pump activates and activates very frequently. Believe the frequency of the float switch engaging caused a failure to engage with the pump and caused the sewage to back up into the home. Notified homeowner of findings.