Backflow FAQ

To schedule backflow service, please contact us at 888-843-7155



What is backflow?

Backflow is the undesirable reversal of the flow of water from its intended direction in any pipeline or plumbing system. Put simply, a typical water distribution system allows water to flow from a service line to your establishment. Hydraulic conditions within the system may deviate from the normal conditions, causing the water to flow in the opposite direction. Eventually, this will lead to the local public water supply, and create potentially hazardous cross-connection.


Why do we need to prevent backflow incidents?

With any backflow incident there is a risk of non-potable materials – those not intended for human consumption – flowing back into the local water system. This could include wastewater, industrial fluids, chemicals, fire sprinklers, or lawn irrigation water.


What causes backflow?

Backflow occurs when the water pressure in the water distribution system is lower than the water pressure in an individual system. There are two main causes of backflow:  back-siphonage and backpressure.

Backsiphonage occurs when a negative or reduced pressure is applied at a building’s tap, creating the potential for contaminants to be siphoned into the drinking water system. Potential causes of backfsiphonage include heavy water usage on a system, water main breaks, and unauthorized fire hydrant use.

Backpressure incidents can occur when the pressure on an individual system exceeds the pressure in the distribution system, resulting in undesirable gasses or liquids being introduced into the drinking water supply. Potential causes of backpressure include pumps, elevated piping, and thermal expansion.


How can backflow incidents be prevented?

Backflow incidents can be avoided through the installation of a backflow prevention assembly. A backflow prevention assembly essentially turns pipe into a one-way street; water can flow in the intended direction, but cannot flow backwards even in the presence of backflow or backsiphonage.

In order to ensure that these important devices are functioning properly, backflow assemblies should be tested on a yearly basis to confirm that the water distribution system is being adequately protected from potentially-harmful pollutants or contaminants.

If you need to have backflow testing, installation, or repair performed, PAWSC would be happy to help. We employ experienced and professional backflow technicians to perform all manner of backflow service work.

PAWSC employs experienced and professional backflow technicians to test, install, and repair backflow assemblies.



To schedule backflow service, please contact us at 888-843-7155