Updated September 16, 2026
Short answer
A residential septic (OSSF) permit in the greater Houston area costs roughly $210–$575 in county fees depending on where you build: Fort Bend County charges $575, Grimes $420, Washington $325, San Jacinto $310, Liberty $275, Austin County $275–$375, Colorado $250, and Walker $210, while Harris, Montgomery, Waller, and Wharton counties confirm the current fee at application. The permit itself is required by state law — every new system must be designed and approved under TCEQ rules (30 TAC Chapter 285) before installation — and your installer normally files it for you.
Who actually issues your permit
TCEQ delegates septic permitting to each county's authorized agent, so the fee and the paperwork depend on the county where the property sits — not the city. The table below lists the authorized agent for each county we serve, with the published single-family fee where the county publishes one.
What the fee covers
The county fee generally covers the application review, the soil/site evaluation review, and the inspections that let the county authorize your system to operate. It does not include the system design or the installation itself — those are part of your contractor's price.
We file it for you
Quick Flow Septic handles the whole permit path as part of every installation: the soil evaluation, the TCEQ-compliant design, the county application, and the final inspection. The county fee is passed through at cost — you never stand in line at the permit office.
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Houston-area septic (OSSF) permit fees by county
| County | Permitting authority | Single-family permit fee |
|---|---|---|
| Harris | Harris County Office of the County Engineer — Wastewater Quality Permitting | Set at application — confirm with the county |
| Montgomery | Montgomery County Environmental Health Services | Set at application — confirm with the county |
| Fort Bend | Fort Bend County Environmental Health Department | $575 |
| Waller | Waller County Environmental Division | Set at application — confirm with the county |
| Liberty | Liberty County Permit & Inspection Department | $275 |
| Washington | Washington County Environmental Health (Engineering & Development Services) | $325 |
| Grimes | Grimes County Environmental Services Division | $420 |
| San Jacinto | San Jacinto County Permit Department | $310 |
| Walker | Walker County Planning & Development — On-Site Wastewater | $210 |
| Colorado | Colorado County Permit Office | $250 |
| Austin | Austin County Planning & Development Department | $275 conventional / $375 aerobic |
| Wharton | Wharton County Permit & Inspection Department | Set at application — confirm with the county |
Frequently asked questions
Do I need a permit for a new septic system in Texas?
Yes. Under TCEQ rules (30 TAC Chapter 285), a new on-site sewage facility must be permitted through the county's authorized agent before construction, apart from narrow acreage-based exceptions that rarely apply to residential builds in the counties we serve.
Can I apply for the septic permit myself?
A homeowner can, but the application requires a site/soil evaluation and a system design prepared by licensed professionals, so in practice your installer files the package. We include the filing in every installation.
Why aren't Harris, Montgomery, Waller, and Wharton fees listed?
Those counties set or update their OSSF fee schedules without publishing a single current figure online, so we only print fees we can verify — eight of the twelve counties we serve. We confirm the exact county fee for your address as part of your free estimate.
Is the permit fee part of the installation price?
It's a county charge on top of the system price — for most projects a small fraction of the total. See our septic cost guide for what actually drives the price of the system itself.
How long does county approval take?
It varies by county and workload. The county reviews the application and design before construction can start, then schedules a final inspection once the system goes in — we build that timeline into your project schedule.
Quick Flow Septic installs new septic systems across Harris County · Montgomery County · Fort Bend County · Waller County · Liberty County · Washington County · Grimes County · San Jacinto County · Walker County · Colorado County · Austin County · Wharton County.
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