Septic tank service costs depend on your project and location. Check with a local pro for your specific job.
The cost to replace a septic tank in Austin, TX, averages $5,886.
You may have to pay more than average if you have invasive tree roots near your tank, as the tree may need to be removed.
Permits are required to replace a septic tank in Austin, TX, with typical costs ranging from $300 to $1,000.
Hiring a septic tank professional in Austin, TX, helps you avoid the expense of failed inspections that can occur with DIY work.
Property owners can expect to pay in a range of $4,905 to $11,772 for the cost to replace a septic tank in Austin, TX. However, most homeowners in the city spend $5,886 on average. Your costs may be higher if your tank is in an area with invasive roots, requiring tree removal, or if the property has a high water table, which is common near Lady Bird Lake, Lake Travis, or nearby rivers and creeks.
The size and type of septic system affect the cost of replacing a septic tank in Austin, TX. If you have invasive tree roots near the system that may damage the septic tank, drain field, and pipes, you’ll pay more. Tree removal in Austin, TX, has an average cost of $735.
If you live in a neighborhood of Austin, TX, with a septic system that’s several decades old, your current wastewater pipes might not work with the new tank. A septic tank pro can advise you if you’ll have extra costs beyond the installation of the new tank. Neighborhoods that commonly have older septic systems include those near Lake Travis and Anderson Mill.
The septic tank size you need depends on the number of bedrooms your home has. For a three- or four-bedroom home, you’d need a 1,000-gallon septic tank, which costs $880 to $1,475 for the tank alone.
Larger houses have more sinks, toilets, bathtubs, and other wastewater sources that flow into the septic tank. As tank size increases, so do costs.
| House Size | Tank Size (Gallons) | Average Cost |
|---|---|---|
| 1 bedroom | 500 | $490–$885 |
| 2 bedroom | 750 | $685–$1,180 |
| 3–4 bedrooms | 1,000 | $885–$1,475 |
| 5–6 bedrooms | 1,200 | $1,180–$1,570 |
| 6–7 bedrooms | 1,500 | $1,475–$2,455 |
Septic tanks may be made of a few different materials. Fiberglass is often the most expensive. To save some money, compare a concrete versus a plastic septic tank instead. Here’s how much a tank costs based on its material.
| Material | Average Cost |
|---|---|
| Plastic | $490–$1,965 |
| Concrete | $685–$1,965 |
| Fiberglass | $1,175–$1,965 |
Call a pro with any questions you have about your system, even if they're general questions. The more informed you are about your system, the better it will work and the better that pros can help you with it.
Replacing a septic system often involves excavation and clearing trees or roots. Since excavation can be a messy work, many homeowners add sod over their yards or even regrade their yards at the end of a septic tank replacement for a finished look.
| Prep Work | Average Cost Range |
|---|---|
| Excavation | $1–$5 per square foot |
| Tree/root removal | $195–$1,965 |
| Sod installation | $1–$2 per square foot (including labor) |
| Yard regrading | $980–$3,240 |
Hiring a septic tank professional in Austin, TX, is required for replacing a tank. You also need to obtain permits and pass inspections when doing the work, which often requires a pro. If you’re unsure how to find your septic tank, a pro can do it for you.
In the Austin, TX, area, you need to submit a plan for the replacement installation and receive approval before starting the work. Permits for this work cost $300 to $1,000. Those who need a site evaluation or a new design for the system will pay at the higher end of the permit range.
In nearly all cases, the professional will charge you a flat fee for the tank replacement work instead of charging by the hour. If your septic tank is on a rural property in Austin, TX, or Travis County, you might pay a trip fee to have a professional visit the rural site. If the tank is in a remote area of the property and the professional struggles to move the necessary equipment into place, the job may take longer, and you might pay more than the average.
You don’t have any guarantee that replacing your septic tank in Austin, TX, will increase your home’s value. However, a working septic system improves your family’s quality of life by preventing sewage backups and wastewater leaks.
If you plan to sell, replacing a failing septic tank can also make your home more competitive in the Austin market. Buyers have plenty of options and may avoid homes with septic issues.
Many buyers unfamiliar with septic systems may worry about future repair costs. Showing proof of a recent replacement can ease those concerns, increase buyer confidence, and lead to more offers or stronger offers.
To help homeowners plan their next project, Angi provides readers with carefully researched cost data and upholds strict editorial standards. We start with national average project costs, which we collect by analyzing competitor information, retailer material costs, and input from professional contractors. We then apply local price index data to calculate location-specific estimates that reflect what homeowners typically pay in their local area. To do that, we use data from the U.S. Bureau of Economic Analysis (BEA), including its Regional Price Parities (RPPs), which measure price differences across cities. This helps us account for differences in labor, materials, and overall cost of living, so estimates in higher- or lower-cost areas better reflect real-world local pricing.
Every estimate undergoes a thorough editorial review to verify accuracy, consistency, and alignment with observed market conditions.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
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