What is the purpose of a drain field?

The primary purpose of a drain field, also known as a leach field, is to allow treated effluent to percolate into the soil. After wastewater has been treated through the on-site sewage facility system, the effluent is directed to the drain field where it is dispersed and allowed to seep into the ground. This percolation process helps to further purify the effluent as it's filtered through the soil, utilizing natural processes to break down any harmful pathogens and nutrients.

Soil acts as a natural filtering medium, effectively removing contaminants from the effluent before it reaches the groundwater, thus protecting public health and the environment. The proper functioning of a drain field is essential for the sustainability of on-site sewage systems, ensuring that effluent is adequately managed and that local water sources remain uncontaminated. The process not only supports soil health but also enhances the biological treatment of remaining pollutants in the effluent.