What is the minimum safe distance required from wells and underground cisterns to sewer pipes with watertight connections?

The minimum safe distance required from wells and underground cisterns to sewer pipes with watertight connections is established to prevent contamination of the water supply. The selection of a 20-foot distance is based on guidelines designed to ensure adequate protection against potential leakage or overflow from the sewer system that could pose a risk to the quality of the water in the well or cistern.

This distance helps mitigate the risk of pathogens and pollutants infiltrating the groundwater, thus safeguarding public health. The specific reasoning for 20 feet is derived from industry best practices and regulatory standards that balance practical installation considerations with safety measures. Choosing a distance that is too short could expose water supplies to harmful contaminants, while distances that are overly conservative may not be practical for most installations.

Other distances provided in the choices exceed regulatory and practical requirements. For example, while a 50-foot or 100-foot distance may provide even greater protection, such requirements are typically not necessary in regions with stringent watertight connections and proper installation practices. This allows for efficiency in installation while still upholding safety and environmental standards.