If you are buying a home around Austin or out in the Hill Country, there is a good chance it runs on septic instead of city sewer. That is not a problem. But it is one of the most expensive things on the property to fix if it fails, and the tank is buried where you cannot see it.
After 20 years on septic systems across Central Texas, here is what I tell every buyer who calls. The tank is buried, the drainfield is buried, and the seller wants to close. You cannot see what you are buying unless someone who knows septic gets eyes on it first. This guide walks you through what to ask, what an inspection covers, and the Texas rules nobody warns you about.
First, Find Out What Kind of System You Are Buying
Septic systems are not all the same, and in this part of Texas the difference matters. Most older rural homes have a conventional system: a tank and a gravity drainfield. Lower maintenance, fewer moving parts.
But across the Hill Country, where the soil is rocky, the lots are smaller, or the property sits near water, you find a lot of aerobic systems. These use a pump, an aerator, and often spray heads to treat the water to a higher standard. They work well, but Texas law requires an aerobic system to carry an active maintenance contract with a licensed provider, with inspections three times a year. That matters a lot when you are buying.
Why You Inspect Before You Close
A standard home inspection barely touches the septic system. You want a dedicated septic inspection during your option period, while you still have leverage.
A good inspection tells you whether the system is healthy or near the end of its life, gives you documentation lenders and title companies sometimes ask for, and hands you a negotiating tool if there is a problem. You can ask the seller to repair it, knock the price down, or walk away. A new drainfield can run into five figures. Find that out now, not six months after you move in.
The 9 Questions to Ask the Seller
- Is the home on septic or city sewer? Confirm it in writing.
- What type of system is it, conventional or aerobic? This drives everything else.
- When was it last pumped? No memory and no receipt is a red flag.
- Is there a septic location map or permit? If they do not know where it is, they likely have not maintained it.
- How old is the system? A well-kept system lasts 20 to 40 years.
- Any backups, slow drains, or odors? Ask directly.
- What repairs were done during ownership?
- Is there a current aerobic maintenance contract? Required by Texas law for aerobic systems.
- Does any part of the system cross onto a neighbor’s land?
What a Real Septic Inspection Checks
When we inspect for a buyer, we are not just lifting the lid and looking in. A full inspection means opening the tank, checking sludge and scum levels, inspecting the baffles, and running water through the home to confirm it flows properly to the tank and out to the drain-field. On many jobs we pump the tank so we can see the condition underneath and check the drain-field for backflow. On an aerobic system, we also check the pump, the aerator, the spray heads, the disinfection levels, and the alarm. Then you get a written report with photos you can take straight to the negotiating table.
The Texas Rules That Catch Buyers Off Guard
Septic systems in Texas are regulated by the TCEQ, but your county usually enforces the rules. Hays, Travis, Williamson, Comal, and the surrounding counties each act as the local authority. The state does not legally require a septic inspection on every sale, but many counties, lenders, and title companies make one a condition of closing anyway. If the home has an aerobic system, the maintenance contract is mandatory and must stay active, because a gap can stall your closing. And once you buy, you have to notify the local permitting authority that you are the new owner.
Red Flags to Watch For During a Showing
Watch for soggy ground near the tank or drain field when the rest of the yard is dry, a patch of grass much greener than everything around it, a faint sewage smell, slow drains or gurgling pipes throughout the house, signs of recent digging, or a seller who cannot say where the tank is. (For the full rundown, see our guide on the warning signs your septic is failing.)
Frequently Asked Questions
Not by the state on every sale. But many counties, lenders, and title companies require one to close, and for aerobic systems the maintenance contract is required by law. Even when optional, it is one of the smartest few hundred dollars you can spend before buying.
It depends on the type and size of the system and whether the tank needs pumping as part of the inspection. Call us with the address and we will give you a straight quote up front.
A pump-out empties the tank. An inspection evaluates the whole system: tank, baffles, drainfield, and on aerobic systems the pump and spray components. We often pump as part of a thorough inspection so we can see the condition underneath.
A well-maintained system typically lasts 20 to 40 years. Aerobic systems need more frequent service. Past 20 years with no maintenance, factor possible replacement into your offer.
It is negotiable. Buyers often pay during the option period because the report protects them. Either way, whoever holds the report holds the information.
Buying or selling a home on septic? Get a clear, honest inspection with a same-day report. Call Hometown Septic at (512) 781-1205 or book online.