What is the primary purpose of backflow prevention in certain building water supplies?

What is the primary purpose of backflow prevention in certain building water supplies?

• A. To prevent contaminated water from entering potable supply.
• B. To reduce mineral buildup.
• C. To increase irrigation potential.
• D. To improve color of water.

Answer: (A)

Backflow prevention protects the drinking water system by stopping potentially contaminated water from flowing backward into the potable supply. When pressures in the system change—like a drop in supply pressure or higher pressure downstream—water from non-potable sources (such as irrigation, boilers, or chemical tanks) could be drawn back into clean water lines. Devices such as air gaps, backflow preventers, and check valves create a barrier to reverse flow, preventing contamination of the public water supply. The primary goal is to protect health by keeping contaminants out of drinking water, not to address mineral buildup, irrigation capacity, or water color.

Backflow prevention protects the drinking water system by stopping potentially contaminated water from flowing backward into the potable supply. When pressures in the system change—like a drop in supply pressure or higher pressure downstream—water from non-potable sources (such as irrigation, boilers, or chemical tanks) could be drawn back into clean water lines. Devices such as air gaps, backflow preventers, and check valves create a barrier to reverse flow, preventing contamination of the public water supply. The primary goal is to protect health by keeping contaminants out of drinking water, not to address mineral buildup, irrigation capacity, or water color.