Septic System Installation
Building on a lot without municipal sewer access? Replacing a failed system that cannot be repaired? Septic installation in Bexar County requires TCEQ-licensed installers, engineered system designs, county permitting, and soil analysis—a process with little room for shortcuts.
Bexar County Installation Requirements
Texas regulates on-site sewage facilities (OSSFs) through the TCEQ, with Bexar County Development Services handling local permits. Every new installation requires:
Soil Evaluation A licensed site evaluator tests your property's soil percolation rate and profiles the subsurface conditions. The Hill Country's variable geology—limestone outcrops, caliche layers, clay pockets—means adjoining lots can require completely different system designs.
System Design Based on soil conditions, anticipated wastewater volume (calculated from bedroom count), and lot constraints, an engineer or licensed installer designs an appropriate system. Options range from conventional gravity-fed drain fields to aerobic treatment units to drip irrigation systems.
County Permit Bexar County reviews the design, confirms setback requirements from wells and property lines, and issues the installation permit. Installations in the ETJ (extra-territorial jurisdiction) of various cities may involve additional review.
Installation Inspection County inspectors verify installation matches the approved design before the system can be covered and put into service.
System Types We Install
Conventional Anaerobic Systems The traditional septic setup: a buried tank where bacteria break down waste anaerobically, followed by a gravity-fed drain field where effluent percolates into soil. Works well in sandy or loamy soils with good drainage. Limited viability in tight clay or shallow bedrock conditions common in parts of Bexar County.
Aerobic Treatment Units (ATUs) These systems inject air into the treatment chamber, supporting oxygen-dependent bacteria that produce cleaner effluent. Required in challenging soil conditions and for smaller lots where conventional drain fields won't fit. ATUs require electricity and periodic maintenance but can work where conventional systems cannot.
Low-Pressure Dosing Systems A pump delivers measured doses of effluent to the drain field rather than relying on gravity flow. Provides more even distribution across the absorption area and works on sites with unfavorable topography.
Drip Irrigation Systems For the most challenging sites—rocky terrain, small lots, poor soil drainage—drip systems distribute highly treated effluent through buried irrigation tubing. Requires an ATU for pre-treatment and is the most mechanically complex option.
New Construction Process
Site Evaluation (1-2 weeks) We schedule the soil test and survey your lot constraints.
System Design (1 week) Based on evaluation results, we design a system matched to your site and household size.
Permit Application (2-4 weeks) We prepare and submit the Bexar County OSSF application with all required documentation.
Installation (2-5 days depending on system type) Once permitted, installation typically completes within a week. Conventional systems install faster; aerobic and drip systems require more time.
Final Inspection and Commissioning County inspection, system activation, and homeowner orientation on operation and maintenance.
Replacement Systems
Failed drain fields, cracked tanks, and systems that no longer meet current codes all require replacement. The process mirrors new construction—site evaluation, design, permitting, installation—but adds demolition and disposal of the old system.
If your existing system is failing, we evaluate whether repairs can extend its life or whether replacement is the more economical long-term choice.
Installation Costs
Septic installation costs vary significantly based on system type and site conditions:
- Conventional systems: $8,000-$15,000
- Aerobic treatment units: $15,000-$25,000
- Drip irrigation systems: $20,000-$35,000
These ranges reflect Bexar County norms but actual costs depend on soil conditions, tank size, system complexity, and site accessibility. We provide detailed written estimates after site evaluation.
Schedule a Site Evaluation
Planning new construction or facing a failed system? Contact us to schedule a site evaluation and learn which system types suit your property.