Cost to Install a Septic System in Houston [2025 Data]

If you’re building a new home and gravitating toward a septic system, you can look forward to one less bill in the mail for sewage services. The cost to install a septic system in Houston ranges between $6,120 and $9,855, with an average of $7,889. While most homes in Houston can hook up to the city’s sewage system, some homes in the outskirts of the city may not have the same access.

If you need to install a new septic system, find out what your project will cost based on your home size, type of system, and more.

Septic System Installation Cost Factors 

Here are the major cost factors to consider when planning for your septic system installation in Houston, Texas.

Tank Size

The septic tank size you need will depend 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 $900 to $1,500 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.

Materials

Septic tanks are commonly made of plastic, concrete, or fiberglass, with fiberglass being the most expensive. Here’s how much a tank costs based on each material.

In Houston, the water table is 10 to 30 feet underground, meaning that the soil is saturated with water at those depths. However, the depth of the water table can vary with your property’s exact location.

Type of Septic System

Each type of septic system comes with its own set of pros and cons. While anaerobic systems are relatively low-maintenance, they aren’t great for small properties. Similarly, anaerobic systems can do well in small spaces but require extra work.

• Anaerobic: Anaerobic systems are more common and cost $3,000–$8,000. They’re less costly than aerobic systems and don’t need extra power or chemicals, but they’re less efficient and require a larger leach field. A pipe runs from the house to the septic tank, where another pipe runs into the leach field. Anaerobic bacteria break down solid waste before the system distributes the wastewater into the soil. 

• Aerobic: Aerobic septic systems utilize oxygen pumped into the tank to activate bacteria that feed on the solid waste. They’re more expensive at $10,000–$20,000 but are more efficient and work well on smaller properties. They require additional power to run, so hook yours up to a power generator in case of a power outage. Otherwise, these systems can plug into your property’s main power source.

Site Prep

Your septic installation starts with all of the work to assess and prepare the site. Here’s what to expect.

• Land Survey: You’ll need to get a land survey before installing a septic system to ensure your plans fall within property lines. Expect to spend $330–$900 to hire a licensed land surveyor.

• Percolation Test: Before the installation, you need a local perc test pro to perform a percolation test. The test measures water drainage in the soil, soil type, and the height of each sediment layer on your property to determine the best type of septic system for you. The cost to test your soil is $700–$2,000.

• Leach Field Installation: Septic tank systems consist of a septic tank and a trench referred to as a leach field or drain field. This section of the system transports the wastewater back to the soil. Drain field installation costs $5,000–$12,000.

Septic System Installation Pro Costs

These are the additional costs you can expect to pay when hiring a septic system installer near you for a project of this size. 

Labor 

Labor costs range between 50% and 70% of the total project cost. Your septic installer will guide you through the entire process, from soil testing to the final inspections. This is an intensive project in terms of time and labor, and you can’t DIY it, so plan on bringing an experienced pro on board.

Permits

Permits are required for installing septic systems in Houston. The first step is an On-Site Sewage Facility (OSSF) Feasibility Study to determine which septic system type you can install on your property. Secondly, a licensed engineer or licensed registered sanitarian will submit permit documents that include the design of the septic system.

You’ll also need a maintenance contract with a septic company, and not having one is considered a misdemeanor violation.

Does a Septic System Increase Home Value?

Whether a septic system increases a home’s value in Houston depends on several factors. Since Houston is a metropolitan area, septic systems aren’t as common as in outlying rural areas. This means that most homebuyers looking at properties expect a traditional wastewater system tied to the city’s sewer.

The best chances of increasing your home value are by ensuring your septic system is well-maintained. This requires you to pump the tank every three to five years, only flush septic-safe toilet paper, and keep the drain field in good shape.

A septic system in poor condition can lower your home value because new homeowners most likely don’t want to invest in repairs or a system replacement.

How Angi Gets Its Cost Data

Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects. 

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