How deep and level should the absorption beds and trenches in a septic system drain field be?

The absorption beds and trenches in a septic system drain field should be shallow (1-5 feet) and level. This is because a properly functioning drain field relies on the soil's ability to filter and absorb wastewater effectively.

When the trenches are too deep, there is a risk that the wastewater will not be adequately treated before it percolates through the soil. Shallow trenches ensure that the effluent remains within a zone where bacteria can break down contaminants efficiently. Additionally, keeping the absorption beds level allows for uniform distribution of the effluent, preventing pooling and ensuring that all parts of the drain field are used effectively.

In contrast, options that suggest depths of 6-10 feet or uneven surfaces can lead to insufficient treatment and potentially create environmental and health hazards, as effluent may not permeate the soil correctly. Therefore, maintaining a design that is shallow and level is crucial for the efficacy of the septic system's drain field.