Septic System Installation in Greenvine, Texas
Licensed, bonded septic installers in Greenvine and across Washington 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 Greenvine 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.
Greenvine & Washington County
New construction, manufactured & mobile homes
Out around Greenvine, 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 Washington County permit, and build it to pass inspection the first time.
Get My Free EstimateGreenvine is quiet blackland farm country southwest of Brenham, near the Fayette County line. The tracts out here are family land and weekend places with no utilities beyond the meter loop, so every home runs its own septic system.
What we install in Greenvine
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 Washington County soils
Advanced aerobic treatment systems
A lot of the ground around Greenvine 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 Washington County permitting for Greenvine
Septic permits around Greenvine go through Washington 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 Washington County, your septic permit goes through Washington County Environmental Health, a division of the county's Engineering and Development Services, which administers OSSF permitting for the whole county. Every new, altered, repaired, or enlarged system needs a permit before work begins, regardless of acreage, and applications go through the county's online MGO Connect portal. A licensed site evaluator or professional engineer completes the required soil and site evaluation, the county issues a written Authorization to Construct before anything is dug, and a county inspector has to pass the system before it's covered. Aerobic systems also need a recorded Affidavit to the Public and ongoing maintenance by a county-registered provider. We handle that whole sequence for you, from the portal submittal to the final Notice of Approval.
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: Washington County Environmental Health (Engineering & Development Services)
Typical county permit fee: About $325 (county fees change — we confirm the current amount during permitting)
Soil & site conditions near Greenvine
Washington County is classic Brazos Valley blackland: much of the county runs to calcareous black clays like the Frelsburg, Bleiblerville, and Latium series, which drain very slowly and swell when wet. Those tight clays usually land in the least-permeable TCEQ soil classes, where a conventional gravity drainfield won't pass, so most new installs here are aerobic systems with spray or drip dispersal. The loamier Brenham-type soils and the sandier post-oak ground toward the north of the county can grade out better, which is why the on-site soil evaluation is what settles the design for your specific lot.
Why Greenvine 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 Greenvine install works
Instant estimate
Get a ballpark price for your Greenvine 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 Washington 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
Greenvine septic questions
Do you install septic systems in Greenvine?
Yes. We install new septic systems all over Greenvine and Washington County — for new construction, manufactured homes, and mobile homes.
How much does a septic system cost in Greenvine?
Most Greenvine installs run between $9,000 and $15,500 — about $9,000 for a conventional system where the soil allows it, $13,500 for an aerobic spray system, and $15,500 for an aerobic system with drip dispersal. Run the instant estimate for a ballpark, and we'll confirm the exact number once we've seen the lot.
Do I need a permit for a septic system in Greenvine?
Yes. Any new septic system in Greenvine needs a Washington County permit and a soil test before anyone digs — and we take care of all of it for you.
Who issues septic permits in Washington County, and what does the permit cost?
Washington County Environmental Health, a division of the county's Engineering and Development Services at 3650 Highway 36 North in Brenham, administers OSSF permitting countywide. The single-family residential OSSF permit fee is $325 on the county's current fee schedule. Fees change over time, so we confirm the exact amount when we file — the office can be reached at (979) 277-6290.
What are the steps to get a septic system permitted in Washington County?
A licensed site evaluator or professional engineer completes the soil and site evaluation, the system is designed to TCEQ 30 TAC Chapter 285, and the application goes through the county's online MGO Connect portal. The county issues a written Authorization to Construct before any work starts, a county inspector must pass the system before it's covered, and the county issues the Notice of Approval after. We manage the whole sequence as your installer.
Do I need a permit even on a large rural tract?
Yes. Washington County requires an OSSF permit for every new, altered, repaired, or enlarged septic system regardless of acreage — routine tank pumping is about the only thing exempt. If a seller or neighbor tells you a big tract skips the permit, that's not how this county runs it.
Is there a minimum lot size for a septic system in Washington County?
For lots subdivided on or after June 15, 2009, the county requires at least 1.5 acres if the home is on a private well, or 1.0 acre if it's on public water. Smaller or older lots aren't automatically ruled out, but they typically need a professionally designed system. We check where your parcel falls during the site evaluation.
Why do so many Washington County homes need an aerobic system?
The county's blackland clays — series like Frelsburg and Bleiblerville — drain very slowly and usually grade into the least-permeable TCEQ soil classes, which rules out a conventional gravity drainfield on many sites. An aerobic treatment unit with spray or drip dispersal is the design that passes. The sandier post-oak ground in the north of the county can be the exception, and the on-site soil evaluation is what decides.
Can you install a septic system for a manufactured or mobile home near Brenham?
Yes. Manufactured and mobile homes on acreage around Brenham, Burton, Chappell Hill, and the rest of the county need their own permitted septic system just like a site-built house. The same county process applies — soil evaluation, MGO Connect submittal, Authorization to Construct, and inspection before cover — and we handle all of it.
Check your Greenvine lot before you buy or build
Soil rating, flood zone, wetlands, and the likely septic system type for any Greenvine address — free, in seconds.
Get your free Greenvine septic estimate
Tell us a little about your Greenvine property and we'll size your system and set up a free visit. No pressure, no obligation.