Septic rules and requirements in Guadalupe County, Texas
Septic permits in Guadalupe County are issued by the Guadalupe County Environmental Health Department. A new system permit costs $400. USDA rates most of the soil in the county Very limited for septic absorption fields — 95.2% of the rated acres. Guadalupe County Environmental Health · checked 2026-10-06
Guadalupe County Environmental Health
Issues the permit
checked 2026-10-06
$400
Septic system permit
checked 2026-10-06
Very limited
USDA rating, 95.2% of rated acres
checked 2026-10-06
Who issues septic permits in Guadalupe County?
Guadalupe County Environmental Health Department, at 310 IH 10 West, Seguin, Texas 78155, (830) 303-8858. It is part of county government. The state writes the rules it applies.
This office issues septic permits in the county.
Guadalupe County Environmental Health · checked 2026-10-06
What does a septic permit cost in Guadalupe County?
$400 for a septic system permit, on the county's own schedule.
Applies to a new conventional system for a home.
In effect from October 23, 2025.
| Residential Conventional OSSF Application | $400 | a home with a conventional system |
|---|---|---|
| Residential Advanced Treatment OSSF Application | $500 | a home with a advanced treatment system |
| Multi-Unit / Rental Communities / Condo / Commercial OSSF Application | $600 | any system |
| Repair OSSF Applications | $200 | a system the source lists as repair; replacing tanks or drain-fields needs a new permit at the full fee |
| Connection OSSF Applications | $200 | a system the source lists as connection to an existing OSSF |
| Alteration OSSF Applications | $200 | a system the source lists as alteration |
| Expansion of OSSF Applications | $200 | a system the source lists as expansion |
| OSSF Re-Inspection Fee | $200 | a system, per re-inspection |
Advanced treatment systems pay more.
Guadalupe County Environmental Health Fee Schedule · checked 2026-10-06
How long does approval take in Guadalupe County?
30 days.
Applies to a full application.
The county must explain a denial in writing.
Guadalupe County Environmental Health, OSSF Permit Process · checked 2026-10-06
Is the soil in Guadalupe County suitable for a septic system?
USDA rates most of the county Very limited for septic absorption fields — 95.2% of the rated acres. A rating describes the ground, not a parcel. The county's site evaluation decides each lot.
USDA NRCS Soil Data Access (SSURGO) · checked 2026-10-06
What Guadalupe County inspects, and how often
Every 4 months for a system with extra treatment or drip lines.
A company the state registers does the checks.
Guadalupe County Environmental Health, OSSF FAQ · checked 2026-10-06
What Guadalupe County sets itself
The state writes the code. Guadalupe County adds the rules below. They are what makes this page differ from the Texas requirements.
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Every septic system needs a county permit, whatever the size of the lot.
Applies to a system on a lot of any size.
Guadalupe County On-Site Sewage Facilities Order, Section 10(D) · checked 2026-10-06
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1 acre
Applies to a lot that uses its own septic system.
Guadalupe County Environmental Health, OSSF FAQ · checked 2026-10-06
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An engineer or a sanitarian must draw the plans for any system with a pump tank.
Applies to a system with a pump tank.
Guadalupe County On-Site Sewage Facilities Order, Section 10(E) · checked 2026-10-06
Sources
Each figure above has a government source and a checked-on date. USDA's Soil Data Access service supplies the soil records. A script writes them, and nobody types them.
- Guadalupe County Environmental Health
- Guadalupe County Environmental Health, OSSF page
- Guadalupe County Environmental Health, OSSF FAQ
- Guadalupe County On-Site Sewage Facilities Order, Section 10(D)
- Guadalupe County Environmental Health Fee Schedule
- Guadalupe County Environmental Health, OSSF Permit Process
- 30 TAC §285.91(2), Table II -- Septic Tank and Aerobic Treatment Unit Sizing
- USDA NRCS Soil Data Access (SSURGO)
Verify before you act. Septic rules are set locally and they change. Check anything here before you spend money on it. Call the Guadalupe County Environmental Health Department, on (830) 303-8858.