What is the minimum distance a sewer line must be from a water supply line according to most codes?

The minimum distance that a sewer line must be from a water supply line is typically set at 10 feet according to most plumbing codes. This requirement is crucial for public health and safety, as it helps to prevent potential contamination of the potable water supply. The separation minimizes the risk of leaks, cracks, or breaks in the sewer line contaminating the water supply through groundwater pathways or direct contact, which could lead to serious health hazards.

The 10-foot distance serves as a buffer zone to ensure that any potential leakage from the sewer line does not reach the water supply line. This precaution is essential in both residential and commercial plumbing systems, as maintaining the integrity of the water supply is paramount for both safety and quality.