This standard sets the minimum requirements for closed-vessel ultraviolet (UV) disinfection systems and equipment elements for drinking water disinfection of Cryptosporidium, Giardia, and viruses.

It does not include wastewater, reuse, or advanced oxidation treatment. Equipment and elements covered under this standard include UV reactors, related appurtenances, and reactor validation.

The purpose of this standard is to provide minimum requirements for UV systems for drinking water treatment systems. This standard is intended to assist with the design, procurement, installation, and commissioning of UV disinfection systems.