Conventional Septic System Cost

Typical installed range: $3,500 – $8,000

What it is

A conventional system uses a tank plus a gravel or pipe drain field. It needs deep, well-drained soil and adequate space, which is why it is the cheapest option when the site allows it.

When you need it

Regulations vary by state and county. In general, this system is required when a conventional drain field is not allowed by soil, water table or setback rules. Your local health department makes that determination after a soil test.

Cost breakdown

See the other system types: Chamber, Aerobic / ATU, Mound, Sand filter.