Where must the required lavatory be located in relation to a water closet in employee and public toilet rooms?

The required lavatory must be located in the same room as the water closet in employee and public toilet rooms to promote convenience and hygiene. By placing the lavatory within the same space, users can quickly access handwashing facilities immediately after using the toilet, which is critical for maintaining sanitation and preventing the spread of pathogens. This arrangement also complies with the International Plumbing Code, which emphasizes the importance of easily accessible hygiene facilities in public and shared restrooms.

Placing the lavatory in an adjacent room, on a different floor, or in any arbitrary location would hinder users' ability to wash their hands promptly after utilizing the water closet, ultimately compromising health and safety standards set forth in plumbing codes. The need for proximity between these fixtures aligns with the goals of ensuring cleanliness and public health. Thus, the requirement for both fixtures to be within the same room is essential for the effective functioning of toilet facilities.