Bottom of the range: conventional gravity trenches in soil that drains, open flat lot, no pump. Top of the range: engineered system the soil forces on you (mound, drip, aerobic), hillside or wooded lot, pump chamber ($1,800–$4,000 where the disposal area sits above the tank), or a lot with no room for a conventional field.
What's in the quote
- County site evaluation and permit
- Design (engineer-stamped where required)
- Excavation, materials, installation
- Final inspection coordination
- Rough grade and sod
What isn't: landscaping beyond sod, driveway or fence removal if the field is under them, and unrelated plumbing.
Before you commit: get a diagnosis that rules out the repairable causes — clogged distribution box, crushed line, a tank that just needed pumping. A replacement that wasn't necessary is the most expensive mistake in septic.