What is the purpose of backflow prevention devices in potable water systems?

• A. To prevent contaminated water from flowing backward into the distribution system.
• B. To increase water pressure.
• C. To filter contaminants.
• D. To regulate chemical dosing.

Answer: (A)

Backflow prevention devices protect the potable water system by stopping water from flowing backward into the distribution network. When pressure in the system drops or a cross-connection with a non-potable source exists, water could reverse direction and carry contaminants into drinking water. These devices create a barrier or controlled break in flow, preventing any contaminated water from re-entering the supply and safeguarding public health. They don’t raise pressure, don’t filter water, and don’t regulate chemical dosing—their sole purpose is to stop backflow.