New Septic Installation in Harris County, Texas
Licensed, bonded septic system installation for Harris County — Crosby, Huffman, Hockley, Cypress, Tomball, Atascocita 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 Harris County septic installer
Across Harris 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 Crosby, Huffman, Hockley, Cypress, Tomball, Atascocita — handling the soil and percolation testing and the county OSSF permitting from start to finish.
We install new septic systems across the unincorporated parts of Harris County, from Crosby and Huffman on the east side to Hockley, Cypress, and Tomball in the northwest, plus the Atascocita area. Houston is the county seat, but plenty of homes on acreage outside the city limits aren't on municipal sewer and rely on an on-site septic system. As new houses and manufactured homes go up on these lots, a properly sized and permitted septic system is how they handle their wastewater.
What we install in Harris 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 Harris 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 Harris County system is fully permitted and passes the county inspection.
If you're building in unincorporated Harris County (outside any city limits), your septic permit goes through the Harris County Office of the County Engineer's Watershed Protection group, which handles OSSF permitting. The system is designed and stamped by a licensed Texas professional engineer or registered sanitarian, and a registered site evaluator or PE completes the required on-site soil evaluation. We file everything through the county's online ePermits portal, the recorded Affidavit to the Public, the site evaluation, the septic design and site plan, and a maintenance contract from a licensed provider. Once the county reviews the plans and issues the Authorization to Construct, we build it, call in each inspection at least 24 hours ahead, and your permanent power is released only after those inspections pass.
Local OSSF permitting authority: Harris County Office of the County Engineer — Wastewater Quality Permitting
Typical county permit fee: Set by the county — 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 Harris County
Harris County sits on the flat Gulf Coast prairie, and most lots here are clay, clay loam, or sandy clay loam with a water table that rises close to the surface in the wet season. Those slow-draining clay soils often fall into the higher TCEQ soil classes (think Class IV clay), which usually points toward an aerobic treatment unit with drip or spray dispersal rather than a conventional gravity drainfield. The required on-site soil evaluation is what sets your actual soil class and the right system for your property.
Cities & towns we serve in Harris County
We also install new septic systems across the rest of our service area: Montgomery County · Fort Bend County · Waller County · Liberty County.
Harris County septic questions
Do I need a permit for a septic system in Harris 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 Harris 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 Harris County land are what we install most. We size and permit the right system for your home and lot.
Who issues the septic permit in Harris County?
Septic (OSSF) permits in unincorporated Harris County are issued by the Harris County Office of the County Engineer's Watershed Protection group, which runs Wastewater Quality Permitting. You can reach the permits office at (713) 274-3900, and applications are submitted through the county's online ePermits portal.
How much is the Harris County septic permit fee?
Harris County doesn't publish a flat base fee for an OSSF permit, so we don't quote a set dollar amount. The exact county permit fee is confirmed during the permitting process. If you'd like the figure straight from the source, the permits office at (713) 274-3900 can confirm it for your project.
What are the steps to get a septic system permitted here?
First, a licensed Texas PE or registered sanitarian designs the system, and a registered site evaluator or PE completes an on-site soil evaluation. Then the application goes through the ePermits portal with the recorded Affidavit to the Public, the site evaluation, the septic design and site plan, and a maintenance contract from a licensed provider. After the county reviews the plans it issues an Authorization to Construct; the licensed installer then builds the system and calls in inspections at least 24 hours in advance.
Why do so many Harris County homes need an aerobic system instead of a conventional one?
Because of the soil. Harris County's flat Gulf Coast prairie is mostly clay, clay loam, and sandy clay loam with a seasonally high water table, and those soils drain slowly. They often grade into the higher TCEQ soil classes (Class IV clay), which typically favors an aerobic treatment unit with drip or spray dispersal over a conventional gravity drainfield. Your required on-site soil evaluation is what confirms the actual class for your lot.
Can you install a septic system for a new manufactured or mobile home in Harris County?
Yes. A new manufactured or mobile home on a lot outside the city limits needs its own permitted, properly sized septic system just like a site-built house. The same Harris County process applies: an engineered design, an on-site soil evaluation, the ePermits submittal, an Authorization to Construct, and county inspections before permanent power is released.
Does this apply if my property is inside Houston or another city's limits?
Harris County's OSSF program covers unincorporated areas only, not property inside a city's limits. If your lot is in unincorporated Harris County, the County Engineer's Watershed Protection group handles your septic permit. If you're inside a city's limits, permitting may run through that city instead, so it's worth confirming where your lot falls before you start.
Get your free Harris County estimate
Tell us about your property and we'll size your system and schedule a free, no-obligation on-site evaluation.
Serving property owners across the region
Counties We Serve
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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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