When assessing a small septic system, soil must be examined down to what depth?

When assessing a small septic system, the soil must be examined down to a depth of 25 feet to ensure proper evaluation of its characteristics. This depth allows for a thorough understanding of various soil properties that are crucial for the effective functioning of the septic system.

Examining the soil to this depth provides insights into the texture, permeability, and potential for water retention, all of which are essential factors when designing and installing a septic system. These attributes determine how well the soil can absorb effluent from the system and ensure that the system functions correctly while minimizing environmental impacts.

A shallower examination might miss critical layers of soil that could affect drainage and waste treatment, potentially leading to system failure or contamination issues. Therefore, assessing down to 25 feet is vital for safe and effective septic system planning and implementation.