What is the primary function of the drain field?

The primary function of the drain field is to dispose of treated wastewater into the soil. After wastewater passes through the septic tank, where solids settle and some initial treatment occurs, the liquid effluent moves to the drain field. Here, the soil plays a critical role in further treating the effluent through various natural processes, including filtration and microbial action. This process not only helps to purify the water before it enters the groundwater but also minimizes the potential for harmful contaminants reaching the environment.

The effectiveness of a drain field is vital for preventing groundwater contamination and maintaining ecological balance. By allowing treated wastewater to seep into the soil, the drain field helps replenish groundwater aquifers while ensuring the wastewater is treated adequately before re-entering the environment.