Septic Tank Installation in Texas: Complete Guide
Aerobic vs conventional, San Antonio metro county permits, costs, and step-by-step timelines.
Choosing the right system
Most lots in Bexar, Comal and the surrounding counties end up on an aerobic treatment unit (ATU) because of clay-heavy or shallow soils. Conventional systems with a gravity drain field are still allowed where percolation tests pass and the lot is large enough.
A site evaluator will perform a soil test and design a system to your lot, household size and water usage. Expect designs sized for the number of bedrooms plus a safety factor.
Permits by county
Bexar County: permitted through the Bexar County Public Works OSSF program. Comal, Guadalupe, Wilson, Atascosa, Medina and Kendall counties each have their own designated representatives.
We handle the permit application, site plan, soil test scheduling and inspections as part of every install.
Typical timeline and cost
From soil test to a fully installed system usually takes 3–6 weeks. New aerobic systems in the San Antonio metro typically run $8,500–$14,000 installed; conventional gravity systems run $5,500–$9,500 when soils allow.