What is the recommended minimum horizontal separation distance between water mains and sewer lines?

The recommended minimum horizontal separation distance between water mains and sewer lines is typically ten feet. This distance is crucial in preventing contamination of the drinking water supply. Keeping a safe distance between these two types of infrastructure helps to minimize the risk of cross-connections and potential leaks from sewers that could infiltrate the water supply, especially during conditions such as flooding or ground movement.

Maintaining this separation distance is a standard practice in water distribution system design to ensure public health and safety. The ten-foot recommendation acts as a buffer zone that enhances the integrity of the potable water system while reducing the likelihood of harmful contaminants coming into contact with the water supply. This guideline is rooted in various health and safety regulations and is widely accepted in engineering standards pertaining to water distribution and sewerage systems.