What standard must liquid bleach meet to be approved for disinfection in public water systems?

Liquid bleach, specifically sodium hypochlorite, must conform to the National Sanitation Foundation (NSF) Standard 60 to be approved for use in public water systems for disinfection purposes. This standard ensures that any chemical used in potable water systems meets safety and health requirements established for substances that come into contact with drinking water. By conforming to this standard, the bleach has been assessed and verified for its effectiveness as a disinfectant while ensuring that it does not introduce harmful contaminants into the water supply.

The other options, while related to safety and regulation, do not specifically address the requirement for bleach to meet NSF Standard 60 for public water system disinfection. Thus, the primary importance lies in NSF Standard 60, which provides a crucial framework for ensuring the safety of chemicals used in water treatment processes.