Statewide cost pages give you Texas averages. This page gives you the ranges that actually show up on Tyler and Longview quotes — and explains why two neighbors can get prices $8,000 apart.
| Project | Typical East Texas range | Notes |
|---|---|---|
| Conventional system — new install or replacement | $6,300–$10,000 | Tank + drainfield. Only where the site evaluation approves the soil for a conventional design. |
| Aerobic system (ATU) — new install or replacement | $10,000–$20,000 | Required by clay soil, high water table, small lots, or proximity to water. Includes treatment unit, controls and spray or drip dispersal. |
| Site evaluation & permitting | $1,500–$5,000 | Licensed site evaluation, system design and permit fees. Usually part of the total project price — confirm whether your quote includes it. |
| Complete installed system, all-in | $6,300–$20,000 | The full Texas range across system types. Most East Texas conventional jobs cluster at the lower half; aerobic jobs at the upper half. |
Ranges reflect published Texas market cost data (statewide installer surveys and national cost-guide figures for Texas), localized to East Texas conditions. They are planning figures, not quotes — the site evaluation sets the real price.
Compare quotes line by line. A legitimate East Texas install quote should state:
An unusually low "installed price" usually means one of three things: the evaluation and permit aren't included, the system is undersized for your bedroom count, or the installer isn't licensed and the system won't be permitted. An unpermitted system can fail inspection, block your building final, and become your problem — in writing — when you sell. Always ask for the license and the permit paperwork.
Statewide content farms quote Texas averages that blend Houston suburbs, Hill Country rock, and West Texas sand. East Texas is its own case: much of the Tyler–Longview area has sandy loam in the north and west that can suit conventional systems, and heavy clay in low-lying and eastern areas that pushes projects aerobic. That's why the honest local answer is a range with a soil test attached — anyone who quotes you a firm price without an evaluation is guessing with your money.
Get a quote based on your actual lot → or call (903) 282-3347.