New Septic Installation in Walker County, Texas
Licensed, bonded septic system installation for Walker County — Huntsville, New Waverly, Riverside, Dodge, Phelps, Crabbs Prairie 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
Updated October 2, 2026
Your Walker County septic installer
Across Walker 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 Huntsville, New Waverly, Riverside, Dodge, Phelps, Crabbs Prairie — handling the soil and percolation testing and the county OSSF permitting from start to finish.
We install new septic systems across Walker County, from the acreage around Huntsville out to New Waverly, Riverside, Dodge, Phelps, and Crabbs Prairie, including the lake-side subdivisions toward the Trinity. Between the national forest, the timber tracts, and the homesteads along I-45, most of the county sits well beyond any sewer line — homes here run on their own on-site systems. New build, cabin, or manufactured home, we size it, permit it through Planning & Development, and install it to pass the county's inspection.
What we install in Walker 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.
See how a full septic installation works
Comparing installers? See the best septic installers in Walker County
We handle Walker 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 Walker County system is fully permitted and passes the county inspection.
In unincorporated Walker County, septic permits run through the county's Planning & Development office — its On-Site Wastewater division at 1313 University Avenue in Huntsville. Three other authorities cover parts of the county: the City of Huntsville is its own state-authorized septic agent inside its city limits, the San Jacinto River Authority permits within 2,075 feet of Lake Conroe, and the Trinity River Authority within 2,000 feet of Lake Livingston's 131-foot contour. The county asks for its groundwork up front: the property needs a valid 9-1-1 address (allow up to a couple of weeks through the county's addressing office if it doesn't have one), a copy of the recorded deed, a scaled site drawing, and a floor plan of the structure. From there it's the standard TCEQ 30 TAC Chapter 285 sequence — a licensed site evaluator's soil and site evaluation, the design submittal, the county's Authorization to Construct, installation by a TCEQ-licensed installer, and inspection before final approval. Inside Huntsville's ETJ, the city's certificate of compliance comes first. We run that checklist for you so nothing stalls the job.
Local OSSF permitting authority: Walker County Planning & Development — On-Site Wastewater
Typical county permit fee: About $210 (county fees change — we confirm the current amount during permitting)
New to septic? Our guides cover the basics: How Much Does It Cost to Install a Septic System in Texas? (2026) · What Size Septic Tank Do I Need? · What Is a Perc Test (and Why Does It Matter)?
Soil & site conditions in Walker County
Walker County is East Texas timberland: upland forest soils that are typically sands and fine sandy loams sitting over slowly permeable clay subsoil, with alluvial loams along the Trinity River drainages and creek bottoms. The surface layer takes water fine — it's the tight clay underneath and the seasonal wetness that limit a conventional drainfield on many sites. That's why aerobic systems with spray or drip dispersal are commonly specified here, with the occasional deep-sand ridge grading out better. The on-site soil evaluation sets the class and the design for your lot.
What a new septic system costs in Walker County
Our installed prices are flat by system type and cover the system and its installation. The soil evaluation (perc test), the engineered design, and the county permit are not included — we can handle them for you and quote them separately. The soil evaluation also decides which of the three systems your lot needs.
| System type | Installed price |
|---|---|
| Conventional gravity | $8,000 |
| Aerobic (ATU) + spray | $11,950 |
| Aerobic (ATU) + drip | $13,950 |
Walker County's published single-family OSSF permit fee is $210, and it isn't included in the prices above. County fees change, so the current amount is confirmed when the permit is filed.
Cities & towns we serve in Walker County
More Walker County communities we install in
We checked each community the same way as our town pages: spots within 3 miles of the town center, run through the USDA soil survey and FEMA's flood maps. A map sample isn't your lot; the soil borings on your property decide the system.
| Community | Most common soils | Rated "very limited" for a drainfield | In a FEMA high-risk flood zone |
|---|---|---|---|
| Riverside | Falba, Annona | 20 of 20 spots | 7 of 20 spots on land |
| Dodge | Annona, Depcor | 21 of 21 spots | 0 of 21 spots on land |
| Phelps | Annona, Depcor | 22 of 22 spots | 2 of 22 spots |
| Crabbs Prairie | Falba, Arol | 22 of 22 spots | 2 of 22 spots |
| Wildwood Shores | Not sampled (no USGS place record in this county) | ||
Sources: USDA NRCS Soil Survey (SSURGO) and FEMA National Flood Hazard Layer, checked October 2, 2026. Spots on open water (lakes, rivers, bays) are left out of the flood column, which covers land only. Check your own lot with the free land check.
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 · San Jacinto County · Colorado County · Austin County · Wharton County · Brazoria County · Chambers County · Polk County.
Walker County septic questions
Do I need a permit for a septic system in Walker 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 Walker 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 Walker County land are what we install most. We size and permit the right system for your home and lot.
Who issues septic permits in Walker County, and what does the permit cost?
Walker County Planning & Development's On-Site Wastewater division at 1313 University Avenue in Huntsville, (936) 436-4939, issues OSSF permits for unincorporated land; inside Huntsville city limits the city issues them, and lake lots near Lake Conroe or Lake Livingston go to the river authority for that lake. The single-family residential permit fee is $210 on the county's published fee sheet, and an aerobic system also records an Affidavit to the Public with the County Clerk (about $26). We confirm the current figures when we file.
What does the county need before it will take my septic application?
Three things trip people up: the property must have a valid 9-1-1 address (getting one takes roughly 7–10 business days through the county's addressing office), and the application needs a copy of the recorded deed, a scaled site drawing, and a floor plan of the structure. After that it's the standard sequence — site evaluation, design, Authorization to Construct, licensed installation, and inspection. We assemble the whole packet for you.
My property is near Huntsville — does the city get involved?
Inside the city limits, the City of Huntsville issues the septic permit itself; it has been a state-authorized septic permitting agent since 2001. If your lot is outside the city but within its extraterritorial jurisdiction, about two miles out, the county requires a City of Huntsville certificate of compliance before it will issue the septic permit. Beyond that, it's purely a county matter. We check where your parcel falls at the start so the right approvals happen in the right order.
Why do many Walker County lots need an aerobic system?
The timberland soils here are sands and sandy loams over slowly permeable clay, often with seasonal wetness. The surface drains fine, but water stalls on that clay subsoil, which fails the TCEQ criteria for a conventional gravity drainfield on many sites. An aerobic treatment unit with spray or drip dispersal is the design that passes — and the on-site soil evaluation is what decides for your lot.
Can you install a septic system for a manufactured or mobile home in Walker County?
Yes. Manufactured homes on acreage around New Waverly, Riverside, Dodge, and the rest of the county need their own permitted on-site system, and the county process is identical to a site-built house. We handle the 9-1-1 address check, the evaluation and design, the permit, and the licensed install end to end.
Who inspects the system, and when?
Walker County's On-Site Wastewater division inspects the system before it's covered, after installation by a TCEQ-licensed installer. The county's permit windows run weekday mornings and afternoons, and we coordinate the inspection timing so your system is approved and buried without sitting open.
Get your free Walker 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 Walker 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
- Brazoria County
- Chambers County
- Polk 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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