New Septic Installation in Grimes County, Texas
Licensed, bonded septic system installation for Grimes County — Navasota, Anderson, Iola, Bedias, Plantersville, Todd Mission 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 Grimes County septic installer
Across Grimes 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 Navasota, Anderson, Iola, Bedias, Plantersville, Todd Mission — handling the soil and percolation testing and the county OSSF permitting from start to finish.
We install new septic systems across Grimes County, from Navasota and the county seat at Anderson up to Iola, Bedias, Richards, and Shiro, and down through Plantersville and Todd Mission on the Montgomery County line. With Highway 249 pushing this way, this stretch of the Post Oak Savannah is filling in with new homes and manufactured homes on acreage — and almost none of it has sewer to tie into. A properly sized, county-permitted septic system is how a homesite out here goes live, and we handle the whole thing.
What we install in Grimes 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 Grimes 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 Grimes County system is fully permitted and passes the county inspection.
In Grimes County, septic permitting runs through the Grimes County Environmental Services Division, headquartered at the county annex in Anderson. The county's own published sequence starts with a certified site evaluator doing the soil and site evaluation, a system design built on those results, and the permit application filed with the fee. The county issues an Authorization to Construct before any dirt moves, the system must be built by a TCEQ-licensed installer, and a county representative inspects the finished install before issuing the Notice of Approval. On aerobic systems, a notarized Affidavit to the Public also gets recorded with the County Clerk. One thing new for 2026: the county now requires its Certificate of Compliance before permanent electric service can be connected to a new structure in the unincorporated county, so the septic permit isn't a detail you can leave for later — we sequence it so your power isn't held up.
Local OSSF permitting authority: Grimes County Environmental Services Division
Typical county permit fee: About $420 (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 Grimes County
Grimes County sits in the Post Oak Savannah, and the ground here has a split personality: gray, fine sandy loam on top that looks friendly, sitting over a dense clay pan that barely lets water through. That claypan is what sinks a conventional drainfield on many lots — water perches on the clay instead of soaking away. Aerobic systems with spray or drip dispersal are the common answer across the county, with the bottomland clay loams along the creeks telling a similar story. The on-site soil evaluation sets your lot's actual class and the design that will pass.
Cities & towns we serve in Grimes 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 · San Jacinto County · Walker County · Colorado County · Austin County · Wharton County.
Grimes County septic questions
Do I need a permit for a septic system in Grimes 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 Grimes 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 Grimes County land are what we install most. We size and permit the right system for your home and lot.
Who issues septic permits in Grimes County, and what does the permit cost?
The Grimes County Environmental Services Division issues OSSF permits, from the county annex at 1170 CR 280 in Anderson, (936) 873-4495. The residential permit fee is $420 on the county's current schedule, and an aerobic system also records a notarized Affidavit to the Public with the County Clerk (about $25 for the first page). We confirm current figures when we file.
What are the steps to get a septic system permitted in Grimes County?
The county publishes a straightforward sequence: a certified site evaluator performs the soil and site evaluation, a design is prepared from it, and the application is filed with the fee. The county issues an Authorization to Construct before work starts, a TCEQ-licensed installer builds the system, and a county representative inspects it before issuing the Notice of Approval. We handle every step as your installer.
Is it true I can't get permanent power without the septic being approved?
Effectively, yes. Since January 2026, permanent electric service can't be connected to a structure in unincorporated Grimes County until the county issues its Certificate of Compliance — and an approved, permitted septic system is part of getting there. We sequence the septic permit and inspection so your electrical hookup isn't the thing waiting on it.
Why do so many Grimes County lots need an aerobic system?
The Post Oak Savannah soils here are typically a fine sandy loam sitting on a dense, nearly impervious clay pan. Water perches on that clay instead of soaking through, 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 works, and your on-site soil evaluation confirms it for your lot.
Can you install a septic system for a manufactured or mobile home in Grimes County?
Yes — manufactured homes on acreage around Navasota, Iola, Bedias, Plantersville, and Todd Mission are a big part of what we do. The county process is identical to a site-built house: site evaluation, design, Authorization to Construct, licensed installation, and the county inspection, plus the recorded affidavit on aerobic systems.
Do you cover the whole county, including the Navasota area?
Yes. We install throughout Grimes County — Anderson, Navasota and its outskirts, Bedias, Iola, Richards, Shiro, Roans Prairie, Carlos, Singleton, Plantersville, and Todd Mission. If your property is outside a city sewer service area anywhere in the county, we can size, permit, and install your system.
Get your free Grimes 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 Grimes 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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