TEXAS · TCEQ REGION 13 · 15 COUNTIES
Aerobic septic systems in TCEQ Region 13 (San Antonio)
TCEQ Region 13 office (San Antonio)
14250 Judson Rd, San Antonio TX 78233-4480
Main line: 210-490-3096
TCEQ does not permit septic systems in any of these 15 counties. For an OSSF permit or a maintenance report, use the county's authorized agent in the table below.
From TCEQ's regional office directory, read Oct 31, 2026.
TCEQ Region 13 (San Antonio) covers 15 Texas counties: Atascosa, Bandera, Bexar, Comal, Edwards, Frio, Gillespie, Guadalupe, Karnes, Kendall, Kerr, Medina, Real, Uvalde and Wilson.
All 15 counties permit on-site sewage facilities through a local authorized agent (a county), and maintenance reports go to that agent.
Reports are due within 14 days after the test (30 TAC §285.7(e)(1)(B)). The filing channel is confirmed for 1 of the 15 counties. The rest have not published it, and their pages say so.
30,428 aerobic systems were authorized across the region from 2015 to 2025. In 2025, 2,470 of the region’s 4,416 on-site sewage facility authorizations were aerobic (55.9%).
Counties in TCEQ Region 13 (San Antonio)
| COUNTY | PERMITTING AUTHORITY | HOW TO FILE | AEROBIC 2015–25 | AEROBIC 2025 | MPs |
|---|---|---|---|---|---|
| Atascosa | Atascosa County | Not confirmed | 200 | 35 | 2 |
| Bandera | Bandera County | Not confirmed | 788 | 105 | 10 |
| Bexar | Bexar County | Not confirmed | 6,024 | 465 | 31 |
| Comal | Comal County | upload · Confirmed | 13,846 | 941 | 34 |
| Edwards | Edwards County | Not confirmed | 4 | 0 | 1 |
| Frio | Frio County | Not confirmed | 32 | 1 | 0 |
| Gillespie | Gillespie County | Not confirmed | 1,012 | 77 | 8 |
| Guadalupe | Guadalupe County | Not confirmed | 2,709 | 261 | 13 |
| Karnes | Karnes County | Not confirmed | 167 | 20 | 2 |
| Kendall | Kendall County | Not confirmed | 1,753 | 156 | 16 |
| Kerr | Kerr County | Not confirmed | 1,063 | 96 | 13 |
| Medina | Medina County | Not confirmed | 1,390 | 138 | 3 |
| Real | Real County | Not confirmed | 52 | 8 | 0 |
| Uvalde | Uvalde County | Not confirmed | 0 | 0 | 0 |
| Wilson | Wilson County | Not confirmed | 1,388 | 167 | 8 |
MPs are licensed OSSF maintenance providers whose license mailing address is in the county. Each provider is counted once, where it is based; many also work in neighboring counties.
Permits across the region, 2015–2025
| YEAR | ALL OSSF | SURFACE (SPRAY) | DRIP |
|---|---|---|---|
| 2015 | 4,569 | 2,129 | 103 |
| 2016 | 4,476 | 2,252 | 128 |
| 2017 | 4,874 | 2,376 | 203 |
| 2018 | 5,230 | 2,497 | 227 |
| 2019 | 5,444 | 2,278 | 280 |
| 2020 | 5,915 | 2,634 | 332 |
| 2021 | 6,567 | 3,092 | 487 |
| 2022 | 6,244 | 2,993 | 510 |
| 2023 | 5,144 | 2,460 | 482 |
| 2024 | 4,575 | 2,098 | 397 |
| 2025 | 4,416 | 2,079 | 391 |
Authorizations to Construct from the eleven annual TCEQ “Types of Systems Installed” reports, summed over the region’s counties. Surface irrigation and drip both require aerobic pretreatment. The statewide dataset has the CSV, and the 2025 report compares the regions.
The rules are the same in every county
- · An aerobic system with surface application is tested every four months (30 TAC §285.91(4), Table IV). How often systems are inspected.
- · Each report goes to the permitting authority and the owner within 14 days of the test (30 TAC §285.7(e)(1)(B)). The deadline rule.
- · A new aerobic system starts with a two-year service policy (30 TAC §285.7(c)). After that the owner renews the maintenance contract or, for a single-family home, may maintain the system themselves where local rules allow (§285.7(d)(4)). What the contract must say.
Common questions
Which counties are in TCEQ Region 13 (San Antonio)?
15 Texas counties: Atascosa, Bandera, Bexar, Comal, Edwards, Frio, Gillespie, Guadalupe, Karnes, Kendall, Kerr, Medina, Real, Uvalde and Wilson.
Who permits aerobic septic systems in TCEQ Region 13 (San Antonio)?
All 15 counties permit on-site sewage facilities through a local authorized agent (a county), and maintenance reports go to that agent.
How many aerobic septic systems were permitted in the San Antonio region?
30,428 aerobic systems were authorized across the region from 2015 to 2025. In 2025, 2,470 of the region’s 4,416 on-site sewage facility authorizations were aerobic (55.9%).
When is an aerobic maintenance report due in TCEQ Region 13 (San Antonio)?
Within 14 days after the date the test is performed, everywhere in Texas. 30 TAC §285.7(e)(1)(B) requires the report to go to the permitting authority and to the system owner.
The other fifteen TCEQ regions
Data as of Oct 5, 2026, from the TCEQ authorized-agent register, the OSSF license register, the annual “Types of Systems Installed” reports and the counties’ own pages. How we research and check this. Not legal advice. Verify with your permitting authority.