Where can specific details and legal requirements for backflow prevention be found?

The Water Supply (Water Fittings) Regulations 1999 specifically addresses the requirements for plumbing and water supply systems in order to prevent backflow. This legislation outlines the acceptable standards and practices that must be followed to ensure safe drinking water and protect public health. It includes details on the installation and maintenance of backflow prevention devices, which are crucial in safeguarding potable water from contamination caused by reverse flow.

In contrast, the other options pertain to different areas of regulation. Building Regulations Part P focuses on electrical safety in domestic installations, the Health and Safety at Work Act is primarily concerned with workplace safety and health regulations, and the Water Resources Act addresses water resource management rather than plumbing specifics. Therefore, for the precise legal standards and technical details regarding backflow prevention, the regulations mentioned in the correct choice are the most relevant and authoritative source.