Septic FAQs for the Brazos Valley

In most cases, no, not if your property couldn't support a conventional system to begin with. Soil and lot constraints don't change. If your property qualified for a conventional system originally and you upgraded by choice, it might be possible to convert back, but you'd still need a new design, new permits, and a fresh installation.

Aerobic systems usually have a visible control panel with an alarm light, an aerator that you can sometimes hear running, and either spray heads or a drip distribution area. Conventional systems have nothing visible above ground except a tank lid or two. Your county OSSF records will also show which type was permitted at the property.

A conventional gravity-fed system on a property with good soil is almost always the most affordable option both upfront and over time. But "cheapest" only matters if your property qualifies, and many properties in the Brazos Valley don't. For typical price ranges by system type and what moves the cost, see our Brazos Valley septic cost guide.

Yes. Texas regulations require active maintenance contracts for aerobic and similar systems. If a system is being installed, the maintenance contract is part of getting the system to final approval. If you own an existing aerobic system, your county typically expects to see continuous maintenance records.

The most common conventional system failure is drain field saturation. The soil's ability to absorb effluent decreases over time, especially if the system is overloaded or undersized. Repair options range from rest cycles and additional reserve area to full replacement. In many cases, where the conventional system has reached the end of its useful life, replacement with an aerobic system is the path forward because there's no room left for a new conventional drain field. If you're seeing alarms, slow drains, sewage backups, or wet spots in your yard, call or text us at (979) 286-3100. We can help you figure out whether you're looking at a repair or a replacement.

For a residential install, conventional systems generally run $6,000–$10,000, aerobic spray systems $8,000–$12,000, and aerobic drip systems $10,000–$14,000. Where your particular system lands depends on system size, lot size, soil, and site access. The only way to get an accurate number is a site evaluation. People often search for "septic tank cost," but the tank is one piece of a complete system. These ranges cover the full setup.

No. County permit fees appear as their own line item, separate from the system price, and run $300 to $460 depending on the county. You'll find each county's office phone and email in our Brazos Valley septic guide.

An aerobic system is a small treatment plant. Instead of just settling waste in a tank like a conventional system, it adds oxygen to break it down further, disinfect it, and pump it out through spray heads or drip lines. That's more equipment (aerator, alarm, pump, chlorinator) and a required maintenance contract. In the Brazos Valley, the clay subsoil rules out conventional systems on most properties, which is why aerobic is the common choice here. See our aerobic vs. conventional comparison.

After a few questions about your property, such as lot size, system type, and what's already on property, we can offer a ballpark range. The next step is to schedule a free estimate: someone from Cast Environmental Services comes out, looks at the property, and gives you a written quote. Call or text (979) 286-3100 and we'll get you on the calendar.

If you're inside Bryan, College Station, or another incorporated city, you're probably on city sewer. If you're outside city limits, you're almost certainly on septic. You can also check your county property records, which list the permitted OSSF for your address if one exists. See the county directory above for contact info.

Ask the seller for the OSSF permit on file with the county, including system type and install date. Walk the property and find the tank lids and any spray heads or drip area. If the system is aerobic, find out who holds the existing maintenance contract and whether it's still active. If anything looks off (alarms, wet spots, smells, overgrown distribution area), get a septic inspection before closing if you're still in escrow, or soon after if you've already moved in.

Most Brazos Valley properties we evaluate have at least one feature, a dense clay subsoil, mature trees, tight setbacks, or a subdivision rule, that rules out a conventional system. Aerobic systems handle conditions conventional systems can't. When a property does qualify for conventional, we recommend it, but that's the exception in our service area.

Most permits are issued within two to four weeks of design submission, though county workload and season affect it. Your county office can tell you their current turnaround, or ask us and we'll find out. For what to expect at each stage of the septic process, see our Brazos Valley septic guide.

The inspector specifies what needs to be corrected. We fix it and request a re-inspection. As long as the design is sound and the correction is straightforward, this is a routine bump, not a major setback. "Responsive, knowledgeable, and willing to take the time to talk through all the details to make sure we understood. Todd also works really well with the county inspectors, which we found to be extremely valuable in helping with approval and making slight changes to the design. The job was done on time for a very fair price. I highly recommend!" — Cory S., Google Review

The fastest way is a phone call to your county's environmental health office with your address. They can tell you what's permitted, when it was installed, and what type of system it is. If no permit is on file, the system was likely installed before permitting was required, and a current inspection is your next step. For help deciding between system types, see our aerobic vs. conventional comparison.

We serve the Brazos Valley — College Station, Bryan, Caldwell, Navasota, Hearne, Brenham, Somerville, Snook, Madisonville, and the surrounding communities across Brazos, Burleson, Grimes, Madison, Robertson, Leon and Washington counties. If you're outside that area, give us a call. We cover much of the wider Brazos Valley.

Septic installations (new residential or commercial construction) Septic replacements (failing systems or upgrades) Repairs & troubleshooting Maintenance contracts Real estate septic inspections

Yes. We work on both residential and commercial septic systems. If you're outside our usual service area, call or text to confirm availability.

Yes. In many cases we can provide pricing guidance by phone after a few quick questions. If your project requires a site visit or a design, we'll explain what's needed and why.

For repairs: Have your address, county, symptoms (like alarms or odors), and system type ready. For installs: Share your address, county, bedrooms, square footage, and if you have a design. For maintenance: Provide your address, county, system type, and if you need a new contract.

Once permits and design are approved and the job is scheduled, most installs and replacements take about 1–3 days once started, depending on site conditions and county scheduling.

Yes, in most cases. Replacing a septic system in Texas typically requires an OSSF permit through your county. Requirements can vary and we'll walk you through what applies to your property and handle the coordination and paperwork. Notarization is required for county affidavits.

Costs depend on your property, soil, system type, and county rules. Aerobic systems usually cost more than conventional systems. We’ll give you honest pricing over the phone after a few quick questions. If a site visit or design is needed, we’ll let you know upfront.

We install systems appropriate for your property and county requirements, including aerobic, conventional, and drip systems. We'll explain your options and recommend what fits your site and long-term goals.

Get us involved early in site planning. We’ll coordinate your septic design with your layout, soil, and county rules to avoid delays.

Yes. Aerobic and drip systems require regular maintenance and reporting under Texas regulations. Conventional systems generally don't — they don't have the same mechanical components that need ongoing inspections. If you're not sure what your system requires, call or text and we'll walk you through it.

Most aerobic systems require three service visits per year under Texas regulations. Each visit includes inspection of pumps, aerators, controls, and alarms, plus any required reporting to your local authority. The exact schedule depends on your permit and county requirements.

Without regular maintenance, aerobic systems can fail — leading to alarms, odors, wet spots, and potential permit violations. In Texas, an unmaintained aerobic system can result in notices from your county and costly emergency repairs. A maintenance contract keeps your system running and your required reporting current.

Yes. For new aerobic systems we install, Cast Environmental Services includes two years of routine maintenance and required reporting at no additional charge. After that, we offer ongoing maintenance contracts if you'd like us to keep taking care of the system.

Look for alarms, odors, wet spots, slow drains, or backups. If your system is aging, we’ll help you decide if a repair or replacement is the smarter choice.

Yes. We can coordinate required paperwork and keep you updated on next steps. Notarization is required for all county affidavits.

Yes. We regularly coordinate with builders, designers, and project managers to keep septic planning in step with construction timelines, site layout, and county requirements. Bringing us in early usually makes the rest of the project smoother for everyone.

We don't provide pumping services. If pumping is needed as part of a repair, replacement, or new install, we can recommend a local pumping company.

We'll set up a time that works, come out to the property, find and uncover the system, and run a few simple checks to see how it's working. After the visit, you'll get a clear, plain-language summary of what we saw. If we find anything you should know about, we'll explain what it means for the sale and what the likely repair options and costs look like.