Water Distribution · Cross-Connections
What Is Backflow?
Backflow is an unintended reversal of flow that can move nonpotable water or other material toward the drinking-water system. A cross-connection provides the physical path, while a pressure condition drives the reversal.
Operators look for unprotected connections, hoses, submerged outlets, auxiliary supplies, process equipment, pressure changes, and failed assemblies. Cross-connection specialists determine required protection under the program.
A closed hand valve is not dependable backflow protection, and clean-looking water beyond a connection does not establish that the hazard is acceptable.
If an unknown hose connects public-water piping to process equipment, protect the area, stop or isolate work as authorized, and notify the cross-connection program. Do not improvise a permanent correction.
Key point: A cross-connection is the physical path, and a pressure condition drives the backflow. A closed hand valve is not dependable protection.
Keep learning
Water Distribution Fundamentals
This page comes from the course. It covers mains and valves, storage, pumps and pressure, water quality, backflow, main work and daily operations, one step at a time, with short knowledge checks and a certificate of completion.
Take the course