ANSI/NSF standard covers materials that come into contact with potable water.

• A. EPA 3.3
• B. ISO 14001
• C. ASTM D5135
• D. ANSI/NSF, 61

Answer: (D)

Materials that touch potable water must be evaluated for safety and health effects. ANSI/NSF 61 specifically addresses drinking water system components and sets the criteria and testing needed to ensure materials that contact potable water won’t leach harmful substances. That focus on health effects for components in contact with drinking water is why it’s the correct standard. The other options don’t provide that targeted evaluation: EPA 3.3 isn’t a standard for drinking-water materials, ISO 14001 relates to environmental management systems, and ASTM D5135 is a general test method not specific to materials in contact with potable water.