CA AB2330

Defines "cold spa" as a structure for brief therapeutic immersion in water maintained between 35-60 degrees Fahrenheit, including cold plunge tanks and cold immersion pools

Requires cold spas to include mechanical recirculation systems that continuously or intermittently circulate, filter, and disinfect water

Permits use of ozone and ultraviolet (UV) disinfection technologies, which may eliminate the need to drain and refill after each use if water quality standards are maintained

Establishes state preemption, prohibiting local governments from adopting stricter regulations on cold spas regarding lifeguard staffing, medical personnel, construction classifications, water replacement frequency, or permitting standards

Allows cold spas to operate without onsite lifeguards when following an approved operational safety plan with posted supervision and warning signage