Septic System Installation in the Brazos Valley
Whether you're building new or replacing a failing system, we'll help you figure out what your land needs. Every property is different — site conditions, soil type, and setback distances all factor into the right system.
As a trusted Brazos Valley septic installer, we handle the full OSSF (On-Site Sewage Facility) design and install process, whether that's aerobic, conventional, or drip.
Serving the Brazos Valley — including College Station, Bryan, Caldwell, Hearne, Iola, Navasota, and surrounding areas.
AEROBIC
The most common system we install is the aerobic treatment unit (ATU), which uses oxygen to break down waste more efficiently than conventional systems. After treatment, the disinfected water is pumped through a spray distribution system to irrigate designated areas of your property. This setup not only meets Texas OSSF standards but also allows for a smaller drain field footprint and environmentally friendly water reuse.
Most Common
CONVENTIONAL
Conventional septic systems require carefully evaluated site and soil conditions—such as soil texture, percolation rate, depth to groundwater, and adequate setback distances—to ensure the drain field can effectively filter effluent into the ground per Texas OSSF standards. These systems rely on gravity-fed trenches filled with gravel or media where soil microbes purify wastewater through filtration and biological breakdown.
DRIP
Ideal for properties with limited space, our drip distribution septic systems pair a treatment unit with low-pressure dosing through flexible emitter lines buried just below the soil surface. This efficient method provides uniform wastewater dispersal, requires minimal drain field area, maintains compliance with Texas OSSF regulations, and allows for landscaping over the system while reducing clogging and maintenance needs.
REPLACING A FAILING SYSTEM
Patches rarely hold. If your septic is backing up, pooling, or failing inspection, we install full replacement systems — aerobic, conventional, or drip — sized and designed for your site. Free on-site assessment to help you decide whether replacement or repair makes sense for your property.
What We Handle For Your Install
We'll provide a seamless process from initial planning to final county inspection.
On-Site Sewage Facility (OSSF) Design
New systems and full system replacements are required to be designed by a licensed professional designer. We can schedule time with our recommended designers and include this fee in your final invoice, or you can select and have the system designed yourself.
Required County Paperwork
We will facilitate all required paperwork with the county to make the system installation process as simple as possible utilizing digital technology as available by the county.
Note: a notarization will be required for all county affidavits.
System Installation
Upon county approval, we will complete the installation in line with the OSSF design. Residential installations typically take 1–3 days once started. Commercial timelines vary depending on system size and site conditions — we'll give you a realistic estimate upfront.
County Inspection
All systems must be inspected by the County Designated Representative and approved prior to use. We schedule the inspection quickly following the completion of the install to ensure the system is properly installed and ready for use.
Ongoing Maintenance
Texas requires all OSSF systems to be maintained by a licensed professional. All new aerobic systems include two years of routine maintenance and required county reporting at no additional charge. After two years, we offer ongoing maintenance contracts.
Why property owners choose Cast Environmental Services:
-
Licensed OSSF Installer II — the highest Texas credential
-
Two years of maintenance included with every aerobic install
-
One family, one crew, one phone number. No call centers, no runaround.