What is the required distance between public water supply lines from unlined evapotranspiration beds?

The requirement for public water supply lines to be located at least 100 feet away from unlined evapotranspiration beds is primarily rooted in public health and safety concerns. This distance is established to prevent potential contamination of the public water supply. Unlined evapotranspiration beds, which are used for the treatment and disposal of wastewater, can release pathogens, nutrients, and other contaminants into the surrounding soil and groundwater.

By maintaining a 100-foot distance, the risk of contaminants traveling through the soil and reaching the water supply lines is significantly reduced. This buffer zone is critical in ensuring that water quality is maintained and that public health is safeguarded, as bacteria or chemicals from the treatment systems could compromise the safety of the drinking water if they were to migrate closer.

The other distances provided in the choices are insufficient to adequately protect water supply lines from potential contamination. Therefore, the requirement for a 100-foot separation is a crucial aspect of water supply safety regulations.