The underground water service pipe from the meter shall not be less than _____ feet apart horizontally from the house sewer.

The regulation regarding the horizontal separation of the underground water service pipe from the house sewer is designed to prevent cross-contamination between the drinking water supply and wastewater systems. Keeping the pipes at a minimum distance from each other helps to reduce the risk of sewage leaking into the potable water supply, which is essential for public health and safety.

A separation of at least 5 feet is typically specified in plumbing codes to ensure that there is adequate distance to mitigate the risk of infiltration or damage that could lead to contamination. The rationale behind this minimum distance is based on practical considerations of soil movement, potential leaks, and the maintenance of both systems.

This requirement highlights the importance of adhering to plumbing codes and standards that are put in place to protect the integrity of water systems and the health of the community. The other distances mentioned, while they may seem prudent, are above the minimum requirement set for safe installation practices.