Bexar County, TX
Septic systems and aerobic maintenance in Bexar County
Updated · Editorial team; not yet technically reviewed
Short answer
Every on-site sewage facility in Bexar County must be permitted. For aerobic systems, the initial permit lasts two years after installation; after that, the owner must keep a service contract with a maintenance provider on file with the county, and the provider submits quarterly maintenance reports.
What Bexar County handles
All on-site sewage facilities within Bexar County must be permitted. [1]
For aerobic systems, the initial permit is valid for two years after installation; after that the homeowner must maintain a service contract with a provider and submit it to Bexar County. [1]
The service provider submits quarterly maintenance reports to the county's designated representative. [1]
Why so many aerobic systems
Shallow soil over limestone across much of northern Bexar County, over the Edwards Aquifer recharge zone, limits conventional drain fields, so many homes use aerobic units that treat and spray wastewater. They need air pumps, chlorinators and alarms kept working, which is why the county tracks contracts.
Don't let the contract lapse
- Calendar the renewal; the contract must stay on file with the county.
- Keep chlorine tablets made for wastewater on hand.
- Call the provider for any alarm or odor, not just at the quarterly visit.
In San Antonio
Most San Antonio homes are on SAWS sewer. See San Antonio high water bills and San Antonio backflow testing.
City-specific guides in Bexar County
- Backflow testing in San Antonio
- Toilet replacement and SAWS rebates in San Antonio
- High water bill in San Antonio? Find the leak, then ask SAWS for an adjustment
- Sewer line clogs in San Antonio and SAWS lateral reimbursement
- Leak and pipe repair help in San Antonio: SAWS Plumbers to People
- Frozen pipes in San Antonio
- Drains backing up in San Antonio
- Water service lines in San Antonio: SAWS inventory and free inspections
Common questions
Do all Bexar County septic systems need permits?
Yes, every on-site sewage facility in the county must be permitted.
How long is a Bexar County aerobic permit valid?
Two years after installation.
What happens after a Bexar County aerobic permit expires?
The owner must keep a service contract on file with the county.
How often are Bexar County aerobic systems serviced?
Providers submit maintenance reports quarterly.
Why are aerobic septic systems common in Bexar County?
Shallow soil over limestone limits conventional drain fields in many areas.
What if my Bexar County service contract lapses?
The county requires a current contract on file, so renew it before it expires.
Do San Antonio homes need county septic permits?
Homes on SAWS sewer don't; the rules apply to on-site systems.
Who files the maintenance reports for Bexar County systems?
The service provider.
Does the Edwards Aquifer affect Bexar County septic systems?
Thin soil over the limestone recharge zone is one reason aerobic treatment is common in northern Bexar County.
Who can service a Bexar County aerobic system?
A maintenance provider under a service contract filed with the county.
Cities and services in Bexar County
- Plumbing services in San AntonioSan Antonio's defining plumbing fact is its water: it comes largely from limestone aquifers and is very hard. Scale buildup drives many local calls, f…
- Backflow Testing in TexasBackflow testing in Texas: the TCEQ tester license anyone testing or repairing assemblies must hold, test-at-install and annual rules, and gauge accuracy checks.
- Water Heater Replacement in TexasTexas law on water heater swaps: cities over 5,000 regulate water heaters and require permits beyond simple repairs, and the homestead exemption for owners.
- Plumbing in TexasStatewide code, licensing and climate for Texas.
Other Texas counties
- Plumbing and septic in unincorporated Harris CountySeptic in unincorporated Harris County: the County Engineer's OSSF permit, the site evaluation and design, the installer inspection, and who to call.
- Septic systems in unincorporated Travis CountySeptic systems in unincorporated Travis County: the county OSSF permit, the soil evaluation and affidavits it needs, and maintenance contracts for aerobic systems.
- Septic (OSSF) permits in Tarrant CountyTarrant County permits septic systems in unincorporated areas and 23 contract cities. When a permit is needed, repair permits, and the ETJ around nearby cities.
Sources (1)
- Bexar County, On-Site Sewage Facilities · checked 2026-10-03