For the septic tank, it is typically situated underground and positioned downstream from the property's wastewater sources, such as toilets, sinks, and showers. The tank's location should allow for easy access for maintenance and pumping while maintaining a safe distance from structures, wells, water bodies, and property lines. Additionally, the tank should be placed in an area with suitable soil conditions that facilitate effective treatment of wastewater before it enters the drain field.

The drain field's location is equally important, as it plays a key role in the final stage of wastewater treatment. The drain field is typically located downstream from the septic tank, where treated effluent is dispersed into the soil for further purification. The area designated for the drain field should have well-draining soil, adequate distance from water sources and property boundaries, and proper slope to ensure efficient wastewater distribution and minimize the risk of saturation or groundwater contamination. Overall, strategic placement of the drain field and septic tank is essential for a functional and environmentally sound septic system.