What is a requirement for water closet seats regarding their position?

The requirement that water closet seats must not be sprung to return is based on safety and usability considerations. When a seat is designed to be sprung to return, it can create an unpredictable movement that may pose a risk to users, especially when seated or getting up. This characteristic can lead to accidents or discomfort, as users may not be able to control the seat's position when they approach or leave the toilet. A stable, fixed position is preferred for user safety and convenience, ensuring that the seat stays in place until it is manually adjusted by the user. Understanding this requirement is essential for compliance with plumbing codes and for the overall design of sanitary facilities.