International Residential Code (IRC) Plumbing Practice Test

Point-of-use reverse osmosis drinking water treatment units are specifically designed to remove contaminants from water, providing users with safe drinking water directly from their taps. The appropriate standard for these units is NSF/ANSI 58, which focuses on the performance and safety of reverse osmosis drinking water treatment systems.

NSF/ANSI 58 establishes criteria for the testing and certification of reverse osmosis systems to ensure they effectively reduce specific contaminants commonly found in drinking water. This standard covers various aspects, including the materials used in the construction of the units, the removal capabilities for various contaminants, and overall product performance.

While the other standards, such as NSF 61, NSF 44, and NSF 55, address different aspects of water treatment—like health effects of the materials in contact with drinking water, water softeners, and UV light disinfection, respectively—they do not pertain specifically to reverse osmosis units. Hence, NSF/ANSI 58 is the relevant standard for ensuring that point-of-use reverse osmosis systems meet the necessary criteria for producing safe drinking water.