The traditional absorption field should be laid in trenches not more than how many inches below the ground surface?

The correct depth for a traditional absorption field to be laid in trenches is typically around 24 inches below the ground surface. This depth is critical for ensuring that the effluent from the septic system is adequately treated as it percolates through the soil layers before reaching the groundwater.

At this depth, the effluent can interact effectively with the soil microbes that help to break down contaminants. Additionally, a 24-inch depth allows for sufficient soil cover to protect the absorption field from surface disturbances, while still ensuring that the absorption field is effective in its function of filtering and treating wastewater.

Going shallower would risk a less effective treatment process, as the effluent may not have enough soil for filtration, leading to a potential failure in the system. Conversely, deeper trenches might complicate the absorption process and could result in issues like groundwater contamination. Therefore, the 24-inch standard strikes an optimal balance between treatment efficacy and environmental protection.