New York City Master Plumbers Exam 2025 – 400 Free Practice Questions to Pass the Exam

The primary purpose of a backflow prevention assembly is to prevent contamination of the potable water supply. This device ensures that water flows in one direction, thus preventing any backflow of potentially polluted water into the clean drinking water system. Contaminants from various sources, such as irrigation systems or industrial processes, can pose significant health risks if they enter the potable water supply.

By using a backflow prevention assembly, plumbing systems safeguard public health by maintaining the integrity of the drinking water. This is critical in ensuring that the water provided to consumers remains safe and free from harmful substances that could lead to illness or other health issues.

Other options, while important in their own contexts, do not primarily relate to the function of backflow prevention assemblies. Enhancing water pressure, decreasing wastewater flow, and controlling stormwater runoff are separate engineering and plumbing considerations that involve different systems and applications.