New Septic Installation in San Jacinto County, Texas
Licensed, bonded septic system installation for San Jacinto County — Coldspring, Shepherd, Point Blank, Oakhurst, Waterwood, Camilla and the surrounding rural communities.
Licensed & Bonded
Texas OSF installer
Permitted & Inspected
County health-dept approved
New Installs Only
Built right the first time
Free Estimates
No-obligation, on-site
Your San Jacinto County septic installer
Across San Jacinto County's rural land, most homes run on their own on-site septic system instead of city sewer. We design, permit, and install new septic systems for new construction, manufactured, and mobile homes throughout the county — including Coldspring, Shepherd, Point Blank, Oakhurst, Waterwood, Camilla — handling the soil and percolation testing and the county OSSF permitting from start to finish.
We install new septic systems all across San Jacinto County, from Coldspring and Shepherd to Point Blank, Oakhurst, and Camilla, including the Lake Livingston communities like Waterwood and Cape Royale. Between the lake lots, the Sam Houston National Forest fringe, and the acreage along the highways, almost nothing out here is on city sewer — homes run on their own on-site systems. Whether it's a new build, a lake house, or a manufactured home on family land, we size the system, pull the county permit, and install it to pass.
What we install in San Jacinto County
Site Evaluation & Perc Testing
We evaluate your soil and run the percolation test that determines how well your ground absorbs water — the foundation of a system that works.
System Design & Sizing
We size the tank and drainfield to your home's bedroom count and your soil's absorption rate, then engineer a layout that fits your lot.
Permitting & County Approval
We prepare and submit your on-site sewage facility (OSF) permit application and coordinate approvals with your county health department.
Excavation & Site Prep
We prepare the site and excavate for the tank and drainfield with the right grade and setbacks — protecting your wells, structures, and property lines.
Tank Installation
We set the septic tank, connect the inlet and outlet plumbing at the correct grade, and install the effluent filter and risers for easy future access.
Drainfield Installation
We install the drainfield (leach field) that disperses treated effluent safely into the soil, sized to your percolation results and available area.
We handle San Jacinto County permitting
On-site sewage facilities (OSSF) are permitted at the county level. We prepare the application, submit the soil and design documentation, and see it through approval and final inspection — so your San Jacinto County system is fully permitted and passes the county inspection.
In San Jacinto County, septic permits go through the San Jacinto County Permit Department in Coldspring, which handles OSSF permitting alongside 9-1-1 addressing and floodplain review — convenient, because near Lake Livingston those checks often run together. The application uses the county's own OSSF permit form, backed by a soil and site evaluation from a licensed site evaluator; aerobic and other non-standard designs are prepared by a professional engineer or registered sanitarian per TCEQ 30 TAC Chapter 285. The county inspects the system before it's covered, and installation must be by a TCEQ-licensed installer — the county even publishes its official installer list. We assemble the packet, file it, and coordinate the inspection so the job isn't waiting on paperwork.
Local OSSF permitting authority: San Jacinto County Permit Department
Typical county permit fee: About $310 (county fees change — we confirm the current amount during permitting)
New to septic? Our guides cover the basics: How Much Does a New Septic System Cost in Texas? (2026) · What Size Septic Tank Do I Need? · What Is a Perc Test (and Why Does It Matter)?
Soil & site conditions in San Jacinto County
Most of San Jacinto County is East Texas pineywoods flatwoods: a fine sandy loam surface over slowly permeable, clayey subsoil, with a seasonal high water table in the wetter months. Soil series mapped through this Big Thicket belt — Sorter, Splendora, Segno — run poorly to somewhat poorly drained, which knocks out a conventional gravity drainfield on many lots. That's why aerobic systems with spray or drip dispersal are the standard install here, with the occasional better-drained sandy ridge near the lake supporting something simpler. The on-site soil evaluation makes the call for your parcel.
Cities & towns we serve in San Jacinto County
We also install new septic systems across the rest of our service area: Harris County · Montgomery County · Fort Bend County · Waller County · Liberty County · Washington County · Grimes County · Walker County · Colorado County · Austin County · Wharton County.
San Jacinto County septic questions
Do I need a permit for a septic system in San Jacinto County?
Yes. A new on-site sewage facility (OSSF) requires a county permit plus a soil/site evaluation before installation. We handle the full permitting process for you, start to finish.
How much does a septic system cost in San Jacinto County?
It depends on your soil type, system type, and drainfield size. Use our instant estimator for a ballpark, then we confirm the exact price after a free on-site evaluation.
Do you install septic systems for manufactured and mobile homes?
Yes — manufactured and mobile homes on rural San Jacinto County land are what we install most. We size and permit the right system for your home and lot.
Who issues septic permits in San Jacinto County, and what does the permit cost?
The San Jacinto County Permit Department at 1 State Hwy 150, Room 3, in Coldspring, (936) 653-3823, issues OSSF permits. The residential OSSF permit fee is $310 on the county's published pricing sheet (commercial is $410). Fees get revised, so we confirm the current amount when we file your application.
What does the permit process look like in San Jacinto County?
You apply through the Permit Department on the county's OSSF application, with a soil and site evaluation from a licensed site evaluator behind it. Aerobic and other non-standard designs are prepared by a professional engineer or registered sanitarian under TCEQ 30 TAC Chapter 285. The county inspects the system before it's covered, and the install must be done by a TCEQ-licensed installer. We handle the full packet and the inspection scheduling.
Does being near Lake Livingston change my septic project?
Often, yes. Lake-area lots in communities like Waterwood, Cape Royale, and Point Blank can be smaller, sloped, or close to the water, and the same county office that issues your septic permit also handles floodplain review, so those checks run together. The design just has to account for the lot — smaller and tighter usually points to an aerobic system with drip dispersal, which fits where a big conventional field can't.
Why do most San Jacinto County homes need an aerobic system?
The pineywoods flatwoods soils here — series like Sorter and Splendora — are fine sandy loams over slow clay with a seasonal high water table, and they're mapped poorly to somewhat poorly drained. That combination fails the TCEQ criteria for a conventional gravity drainfield on many sites, so an aerobic unit with spray or drip dispersal is the system that passes. Your on-site soil evaluation confirms it.
Can you install a septic system for a manufactured or mobile home in San Jacinto County?
Yes. Manufactured and mobile homes around Shepherd, Coldspring, Oakhurst, and the lake communities almost always need their own on-site septic system, and the county process is the same as for a site-built house — evaluation, design, permit, licensed installation, and inspection before cover. We take care of all of it.
Does the county care who installs my system?
Yes — installation must be by a TCEQ-licensed installer, and San Jacinto County publishes an official OSSF installer list through the Permit Department. Using a licensed installer isn't optional, and it protects you: the county won't approve a system that wasn't built and inspected properly.
Get your free San Jacinto County estimate
Tell us about your property and we'll size your system and schedule a free, no-obligation on-site evaluation.
Buying land in San Jacinto County? Check the soil before you close
Enter any address and get the USDA soil rating, FEMA flood zone, mapped wetlands, and the septic system type you're likely looking at — free, in about ten seconds.
Serving property owners across the region
Counties We Serve
- 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
Don't see your county?
We're often able to serve nearby areas too. Reach out with your property's location and we'll let you know if we can help.
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