Backflow preventers can be installed in four-inch sanitary sewer service lines to prevent sewer from backing up into homes. On new service connections, a “backflow” device must be installed in the service line whenever the structure’s slab or first-floor elevation is lower or equal to the top of the nearest manhole.
The Greenville County Codes Office inspects the installation of the backflow preventer. Homeowners that have experienced or are concerned about sewage backing up in their home may want to consider installing a backflow preventer on their sewer lateral.
All mechanical devices require routine maintenance. Backflow prevention devices should be inspected on a regular basis to ensure proper working condition. Local plumbers will be able to assist you if you need help. The homeowner is responsible for maintaining these devices installed on their sewer lateral.