Installing a new septic system is one of the largest plumbing projects a homeowner can undertake. It requires soil testing, engineering design, county health department permitting, excavation, and precise installation to ensure the system functions properly for decades. This is not a project for general contractors — it requires licensed septic system professionals who understand local codes, soil conditions, and system design.
Got Plumbing USA connects you with licensed septic system installers who manage the entire process from soil testing through final inspection.
Installation Process
- Soil and site evaluation — percolation testing determines the soil's absorption rate, which dictates drain field design.
- System design — an engineer designs the system based on soil conditions, household size, lot topography, and local codes.
- Permitting — the design is submitted to the county health department for review and permit approval.
- Excavation — the tank hole and drain field trenches are dug to precise specifications.
- Tank and component installation — the tank, distribution box, and drain field components are set and connected.
- Drain field construction — gravel beds, perforated pipes, and filter fabric are installed per the engineered design.
- Final inspection — the county inspector verifies the installation meets all code requirements before backfilling.
Cost
New septic system installation typically costs $5,000–$25,000+ depending on the system type (conventional gravity, pressure distribution, mound, or aerobic), soil conditions, system size, and local permitting requirements. Conventional gravity systems on suitable soil are the most affordable. Mound systems or aerobic treatment units for difficult sites cost more.