Backflow can occur for several reasons, including when the pressure in the plumbing system for dirty water is higher than the pressure in the supply lines ... sewer backflow preventer to keep ...

Annual backflow inspections required for irrigation systems as city moves to comply with state rules after October warning.

Open the sprinkler zone farthest from the main line and start running ... Return to the main water supply valve near the backflow preventer (if your system has one). You may have a faucet next ...

Local Columbia, SC plumbing companies are showing support for the SCDES backflow prevention program, noting every public water system must initiate a viable cross connection control strategy.