Where should the liquid drain from a level 3 vacuum source be connected?

The correct answer indicates that the liquid drain from a level 3 vacuum source should be connected to a sanitary drainage system. This is appropriate because sanitary drainage systems are designed to safely carry waste material and prevent contamination, which aligns well with the requirements for handling fluids from medical equipment. Since the level 3 vacuum source deals with potentially contaminated liquids, connecting to a sanitary system ensures proper treatment and disposal, mitigating any risks of infection or exposure.

In contrast, connecting to an outdoor drainage system could lead to environmental contamination and is not suited for managing potentially hazardous waste. The nearest utility sink might not be designed to handle the volume or nature of waste from a vacuum source, potentially causing backflow or other plumbing issues. Linking to the stormwater system is also unsuitable as it could result in foul odors and environmental hazards, since stormwater systems are not intended to handle wastewater from medical practices. Thus, using a sanitary drainage system reflects compliance with health and safety regulations in medical gas practices.