Short answer
A new residential septic system in Texas typically runs from about $12,000 for a small conventional system to $20,000+ for a larger aerobic (ATU) drip system — driven mainly by your soil, the system type it requires, and the drainfield size.
What drives the price
The biggest factors are your soil and perc results (better-draining soil needs a smaller, cheaper drainfield), the system type your soil allows, your tank size (set by bedroom count), and the drainfield's linear footage. Site access and county permitting add to it.
Conventional vs. aerobic cost
A conventional gravity system is the most affordable option where soil percolates well and there's room for a standard field. An aerobic treatment unit (ATU) with drip dispersal costs more, but it's required on tighter soils or smaller lots where a conventional field won't pass.
How to get your exact price
Use our instant estimator for a ballpark in under a minute. The exact price comes after a free on-site soil evaluation, since your soil class is the single biggest cost driver.
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