Check local building codes, permits, and setback requirements
Test the soil and determine the proper septic system size
Choose the tank type and drain field layout
Mark the tank, trench, and drain field locations
Excavate the tank hole and drain field trenches
Prepare a level gravel or sand base
Lower the septic tank into the excavation
Connect the house sewer line to the tank inlet
Install outlet piping, baffles, and inspection risers
Connect the tank outlet to the drain field distribution system
Backfill around the tank carefully
Install the drain field pipes and cover them with gravel and soil
Vent the system as required by code
Test for leaks and proper flow
Cover and grade the site to direct surface water away
Schedule final inspection and approval
Maintain the system with regular pumping and inspections