What is the required clearance in inches for a sewer line crossing over a culinary water main?

The required clearance for a sewer line crossing over a culinary water main is typically established to ensure safety and protect the integrity of the water supply. A clearance of 18 inches is well within the standard guidelines that aim to prevent any potential contamination of the culinary water from the sewer line. This level of separation helps to mitigate the risk of backflow or leakage from the sewer system reaching the potable water supply, which is crucial for maintaining public health and safety.

The specified 18-inch clearance provides an adequate distance to ensure that any infiltrations or stress on the sewer line do not compromise the culinary main. Additionally, this distance aligns with state regulations and best practices, which are designed to prevent cross-contamination between sewage and drinking water systems. Compliance with this requirement is essential for the safe operation of both systems.