How far should surface water be from the edge of the drain field?

The correct distance for surface water from the edge of the drain field is 100 feet. This requirement is based on the need to prevent contamination and ensure the proper functioning of the septic system. Surface water, such as from rain or runoff, can carry pollutants into the drain field, potentially overwhelming the system and leading to system failure or contamination of groundwater.

Maintaining a distance of 100 feet helps to create a buffer zone where any surface water can disperse and filter before it reaches the drain field. This distance also aids in protecting the septic system's integrity by avoiding excessive moisture that could saturate the drain field and disrupt the treatment of wastewater. Proper separation between surface water and the drain field is essential for maintaining the effectiveness of the septic system and safeguarding public health and the environment.

The other distances, such as 10 feet, 50 feet, and 200 feet, do not align with typical regulations or best practices for septic system installation and maintenance. They either do not provide adequate protection or exceed practical requirements.