Hays County Septic

Drain field replacement cost in Hays County / the Central Texas Hill Country (2026)

. This is the number every septic owner is trying to avoid, and the spread is wide because the soil decides the design.

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 (), 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.

Get a replacement estimate

Get started

Book a visit or get a price

Backing up? Send this and we'll come straight back to you.

Repair, replacement or a new install — tell us the situation.

All work is performed by TCEQ-licensed installers and licensed maintenance providers working under the county's on-site sewage facility program.