How far must public water supply lines be from unlined evapotranspiration beds?

The correct distance that public water supply lines must be from unlined evapotranspiration beds is 10 feet. This requirement is based on regulations aimed at protecting public health and maintaining water quality. The separation distance is essential to prevent any potential contamination of the water supply caused by factors such as leachate from the evapotranspiration bed, which could introduce pathogens or pollutants into the groundwater or the drinking water supply.

Establishing this 10-foot buffer helps ensure that the water supply remains uncontaminated by substances that may accumulate in the evapotranspiration beds, including effluents or other waste. Following this regulation also promotes best practices in the design and installation of water supply systems, ensuring compliance with public health standards and safeguarding environmental quality.

In comparison, other distances suggested in the choices do not align with established guidelines, as they either lack sufficient separation to effectively protect the water supply or are unnecessary given the known risks associated with closer proximity.