What is the purpose of a backwater valve?

The purpose of a backwater valve is specifically to prevent sewage from backing up into a building especially during conditions like heavy rain or flooding. When municipal sewer systems become overwhelmed, such as during a storm, the pressure can cause sewage to flow backward into home plumbing systems. A backwater valve acts as a one-way gate that allows sewage to exit the building but prevents it from returning. This is crucial for maintaining sanitary conditions and protecting the living environment from potential contamination and damage.

While preventing leaks, enabling drainage during low pressure, and measuring water flow are important aspects of plumbing systems, they do not pertain to the primary function of a backwater valve. Therefore, the correct understanding of the backwater valve's role is vital for effective plumbing and safeguarding health standards in residential and commercial properties.