What Is A Backwater Valve?
A backwater valve is a plumbing device put in place to prevent raw sewage from backing up into a home. Most properties by default prevent sewage backups due to their piping design or location in relation to grade. For homes with certain plumbing system limitations, or those structures located below the elevation of city sewer manholes, a backwater valve is a must. If the public sewer system gets backed up, these devices will prevent sewage from entering the dwelling through floor drains and fixtures. Above is a diagram of a backwater valve installed on the exterior of a home, which is an ideal installation location for servicing. These can also be install on the interior of a home, such as a basement, where landscaping or structures prohibit.