Septic System Installation in Montgomery, Texas
Licensed, bonded septic installers in Montgomery and across Montgomery County. We handle the soil test, the county permit, and the full install.
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
Instant Estimate
Your Montgomery septic estimate in 60 seconds
A few quick questions and you'll see your system size and a price range. No obligation, no contact info to start.
What are you installing a septic system for?
We specialize in new installs for homes on rural land.
Montgomery & Montgomery County
New construction, manufactured & mobile homes
Out around Montgomery, most homes sit on land city sewer never reached, so they run on their own septic system. We install new systems for new builds, manufactured homes, and mobile homes. We run the soil and perc testing, pull the Montgomery County permit, and build it to pass inspection the first time.
Get My Free EstimateThe old county seat over on the east side of Lake Conroe still runs the way it always has out past SH 105 and FM 149: lakefront lots and rolling acreage on their own septic, well beyond where any city sewer line reaches.
Septic systems in Montgomery
The old county seat over on the east side of Lake Conroe still runs the way it always has out past SH 105 and FM 149: lakefront lots and rolling acreage on their own septic, well beyond where any city sewer line reaches. This stretch of the county leans toward the sandier, loamier Willis-Formation pineywoods soils, so where the dirt drains well some lots can take a conventional or low-pressure dosed system, while lakefront ground gets a closer look at the water table. A new install here is typically new construction or a manufactured home going onto raw acreage, and it starts with a soil analysis from a Registered Site Evaluator and a sealed OSSF design permitted through Montgomery County Environmental Health Services. We handle the permit and the inspections from start to finish.
What we install in Montgomery
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.
Built for Montgomery County soils
Advanced aerobic treatment systems
A lot of the ground around Montgomery is heavy clay, and in spots the water table sits high part of the year. On lots like that a standard gravity drainfield won't pass, so you'll need an aerobic system with drip or spray dispersal. We don't guess at it — the free soil test tells us exactly what your lot can take.
We handle Montgomery County permitting for Montgomery
Septic permits around Montgomery go through Montgomery County, not the state. We put the application together, turn in the soil and design paperwork, and stay on it through approval and the final inspection — so you're not the one chasing the county.
In Montgomery County, your septic permit goes through Montgomery County Environmental Health Services (the On-Site Sewage Facilities program). Before we build, the property needs a site evaluation with a soil analysis from a Registered Site Evaluator, plus an OSSF design sealed by a Registered Sanitarian or professional engineer (submitted in three sets) along with signed floor plans and the property's floodplain status. We handle the Application for Permit to Construct at the county Permit Office at 501 N. Thompson, Suite 100 in Conroe, and after installation we request the Notice of Approval inspection before any backfill. As your installer, we take care of these steps so you don't have to chase the paperwork.
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)?
Local OSSF permitting authority: Montgomery County Environmental Health Services
Typical county permit fee: Set by the county — we confirm the current amount during permitting.
Soil & site conditions near Montgomery
Montgomery County actually spans two different soil zones, and that decides what your system needs. The southern and eastern parts of the county tend to have fine, clay-rich Beaumont and Lissie soils that drain slowly and can sit over a seasonal high water table, while the northern county around Conroe and Willis has sandier, loamier Willis-Formation soils in the pineywoods. Heavy clay lots usually call for an aerobic treatment unit with spray or drip dispersal, while sandier lots up north may allow a conventional or low-pressure dosed system. The on-site soil analysis is what sets your system class, so we never guess.
Why Montgomery homeowners choose us
Licensed & Bonded
Move forward knowing your project is handled by a licensed, bonded installer.
New Construction & Mobile Home Specialists
We install new systems for new construction, manufactured, and mobile homes — so we're fast, precise, and up to date on the rules.
We Handle the Permits
Soil testing, design documentation, and county OSF approval — all managed for you.
Honest, Upfront Estimates
Clear, itemized quotes after we evaluate your site. No pressure, no surprises.
Local & Dependable
We know your county's requirements and show up when we say we will.
Built to Last
Properly sized, properly installed, and restored clean — a system you can forget about.
How your Montgomery install works
Instant estimate
Get a ballpark price for your Montgomery project online in about a minute.
Free on-site evaluation
We test your soil and confirm the right system for your lot.
Permit & design
We handle the Montgomery County OSSF permit end to end.
Install & inspection
Professional installation and final county sign-off.
What homeowners say
"They handled our soil test, permit, and full septic install for our new build. The process was clear, the crew stayed on schedule, and the county inspection passed the first time."
The Ramirez Family
Montgomery County, TX
"We needed septic for our manufactured home and they took care of everything from design to approval. Clear pricing, good communication, and no surprises."
Carlos & Elena Martinez
Waller County, TX
"Our property was raw land and we did not know where to start. They sized the system, handled the county paperwork, and kept the project moving."
The Johnson Family
Liberty County, TX
"Responsive, professional, and familiar with the local requirements. They made the permit and installation process much easier than we expected."
Miguel Hernandez
Fort Bend County, TX
Montgomery septic questions
What type of septic system do lakefront lots near Montgomery usually need?
It depends on the soil and how close you are to Lake Conroe. The Montgomery area sits in the sandier Willis-Formation soils, so well-draining lots can sometimes take a conventional or low-pressure dosed system. But lakefront lots get a close look at the water table and setbacks from the water, and where drainage is tight the design moves to an aerobic treatment unit with spray or drip dispersal. The on-site soil analysis is what sets it, so each Montgomery lot gets its own answer.
How long is a septic permit good for once we start a project in Montgomery?
A Montgomery County permit to construct expires 180 days after it enters the system, so the install needs to move forward within that window once it's issued. That's rarely a problem on a Montgomery new build, but it's why we line up the soil analysis, the sealed design, and scheduling before we file. We track that clock and the Notice of Approval inspection so your permit doesn't lapse mid-project.
Do you install septic systems in Montgomery?
Yes. We install new septic systems all over Montgomery and Montgomery County — for new construction, manufactured homes, and mobile homes.
How much does a septic system cost in Montgomery?
Most Montgomery installs run between $12,000 and $20,000, depending on your soil, the system type, and how much drainfield you need. Run the instant estimate for a ballpark, and we'll give you a firm number once we've seen the lot.
Do I need a permit for a septic system in Montgomery?
Yes. Any new septic system in Montgomery needs a Montgomery County permit and a soil test before anyone digs — and we take care of all of it for you.
Who issues the septic permit in Montgomery County, and what does it cost?
Permits are issued by Montgomery County Environmental Health Services through its On-Site Sewage Facilities (OSSF) program. You'll pay a county permit fee plus a $10 TCEQ state fee. The county adopted a new health fee schedule effective September 1, 2025, so the current county fee amount should be confirmed directly with Montgomery County (the Permit Office can be reached at (936) 539-7839).
What are the steps to get a septic permit here?
First, a Registered Site Evaluator performs a site evaluation with a soil analysis. Then an OSSF design is prepared and sealed by a Registered Sanitarian or professional engineer, submitted in three sets, along with signed floor plans and the property's floodplain status. The Application for Permit to Construct is filed at the Montgomery County Permit Office (501 N. Thompson, Suite 100, Conroe). After we install the system and before any backfill, we request the Notice of Approval inspection. As your installer, we manage these steps for you.
Why do so many Montgomery County lots need an aerobic system?
It comes down to the soil. The southern and eastern parts of the county have fine, clay-rich Beaumont and Lissie soils that percolate slowly and can sit over a seasonal high water table, which commonly calls for an aerobic treatment unit with spray or drip dispersal. The sandier, loamier Willis-Formation soils in the northern county around Conroe and Willis may instead allow a conventional or low-pressure dosed system. Your on-site soil analysis sets the system class, so the design always matches your specific lot.
Can you install a septic system for a manufactured or mobile home on Montgomery County land?
Yes. A lot of work here is new construction and manufactured homes placed on acreage outside city sewer, and those homes need an on-site septic system. We size and install the system to match the home and the lot's soil. The permit process through Montgomery County Environmental Health Services is the same, including the required site evaluation, sealed OSSF design, and Notice of Approval inspection before backfill.
How much land do I need for a septic system in Montgomery County?
Montgomery County guidance is generally about 0.75 acre minimum for a lot without a private well, and roughly 1.5 acres if the property has a well. The exact requirement depends on your soil analysis and system design. We can review your lot during the site evaluation step before installation.
How long is a Montgomery County septic permit good for, and is anything extra needed in Precinct 4?
A permit to construct expires 180 days after it enters the system, so the install needs to move forward within that window. If your property is in Commissioner Precinct 4, the county also requires a Precinct 4 verification/culvert form as part of the process. We'll flag whether that applies to your property up front.
Get your free Montgomery septic estimate
Tell us a little about your Montgomery property and we'll size your system and set up a free visit. No pressure, no obligation.