Septic tank service costs depend on your project and location. Check with a local pro for your specific job.
Converting a cesspool to a septic system costs between $4,500 and $11,200, with most homeowners spending around $6,300 for your project.
The type of septic system you choose and your home size determine your final total, with anaerobic systems costing less than aerobic models.
You should also account for percolation test fees, land surveys, permits, and potential ground repair when creating your conversion budget.
Hiring a local septic tank company prevents groundwater contamination and ensures your new system meets local code requirements for safe operation.
In 2026, the national average cost to convert a cesspool to a septic system is $6,300. Most homeowners pay between $4,500 and $11,200, with the spread driven by the type of septic system, home size, and site-specific factors like permits and ground repair.
The cost of replacing a cesspool with a septic tank varies widely based on the type of system you choose, labor complexity, and permit requirements. Here is a breakdown of how each factor influences the final bill.
The type of septic system you choose is one of the biggest drivers of your total cost, with prices ranging from $2,000 to $20,000. Lower-end options like conventional or anaerobic systems are well-suited to single-family homes and sit at the more affordable end of that range. High-end systems are more complex and specialized, which drives up both engineering and labor costs.
The table below shows how the cost of converting a cesspool to a septic system varies by system type:
| Septic System Type | Average Cost in 2026 |
|---|---|
| Conventional | $5,750 |
| Anaerobic | $4,500 |
| Aerobic | $15,000 |
| Eco-friendly wetland | $11,250 |
| Pressurized | $7,775 |
| Gravelless | $7,000 |
| Evapotranspiration | $12,500 |
| Recirculating sand filter | $8,000 |
The size or capacity of your septic tank is tied directly to your home's size and bedroom count, with tank costs ranging from $500 to $2,500. A one-bedroom home can typically function with a 500-gallon tank, while a six-bedroom home may require a 1,500-gallon tank.
Costs for a cesspool-to-septic conversion vary by tank size and household demand, as shown in the table below:
| Tank Size (Gallons) | Home Size (Number of Bedrooms) | Average Cost in 2026 |
|---|---|---|
| 500 | 1 | $500–$900 |
| 750 | 2 | $700–$1,200 |
| 1,000 | 3–4 | $900–$1,500 |
| 1,200 | 5–6 | $1,200–$1600 |
Labor is one of the largest expenses in a cesspool-to-septic conversion, with local septic tank installer costs ranging from $1,500 to $4,100 depending on project complexity. If your contractor also needs to remove the original cesspool tank and perform ground repair, expect to pay toward the higher end of that range compared to a straightforward new system installation.
Perc tests are typically required before a septic tank installation can proceed and cost between $450 to $1,400 depending on soil conditions and the size of the land area. These tests involve digging holes in the intended leach field to analyze soil composition and drainage capacity. If the test requires a land survey to identify which areas to analyze, you can expect to pay toward the higher end of that range.
A land survey from an insured professional costs between $330 to $900 and confirms that your proposed septic system site sits on your property and meets all legal parameters. While not technically required, skipping a survey can expose you to expensive, unexpected costs down the road if the system is later found to be improperly sited.
Most municipal health or environmental departments require a permit before you can convert a cesspool to a septic system, with permit costs ranging from $330 to $2,000. Permits must be renewed every few years, so budget for ongoing compliance with any changing septic system requirements.
The material your septic tank is made from directly affects both the septic system cost and how long the tank will last. Plastic tanks are the most affordable upfront but are more prone to damage and premature wear, while fiberglass tanks offer greater durability at a higher price point.
Costs to convert a cesspool to septic vary by material type, as shown in the table below (labor not included):
| Septic Material Type | Low Cost in 2026 | High Cost in 2026 |
|---|---|---|
| Plastic | $700 | $2,500 |
| Fiberglass | $1,450 | $2,000 |
| Concrete | $750 | $2,000 |
Labor typically accounts for 50% and 70% of the total installation cost, with system complexity, system size, and site location all influencing the final bill. Remote locations can add transportation costs for heavy equipment and materials, while larger or more complex systems require more expertise and time on the job.
Site prep is another significant labor driver, with excavation costs running up to $300 per hour, land leveling up to $5,000, and leach field repair up to $5,000. Poor soil conditions can further extend the time and effort required for site preparation.
Once your septic tank is installed, plan to budget between $150 and $1,000 every few years to cover routine maintenance and any repair needs that arise.
Regular maintenance is essential to keeping your septic system running smoothly and extending its lifespan, with professional inspections costing between $150 to $450 and recommended at least every three years. Depending on your household size and tank capacity, the septic tank should be pumped every three to five years as well.
Septic tanks handle heavy daily demand, making occasional repairs nearly inevitable, with costs ranging from $600 to $3,000 depending on the extent of the damage. Staying current with regular inspections and routine maintenance is the most effective way to catch issues early and avoid the higher end of that repair range.
Hiring a local septic tank pro will cost homeowners around 50% to 70% of the total project cost in labor alone, but it’s a necessary cost that ensures the project’s completion. Unlike other projects, a pro is required here, so the labor cost is unavoidable. That being said, homeowners should know that those costs go toward the proper completion of an intricate conversion.
Hiring a pro is a requirement, but it comes with many benefits, including:
Proper licensing and insurance are important for this job due to the safety aspects.
Pros will have access to and expertise with heavy machinery that’s often required for excavation.
You may be required to obtain permits, which these teams can easily source.
Hiring a pro ensures that you don’t void any existing warranties or affect your insurance.
Proper installation is important to prevent groundwater contamination.
Local codes may actually prohibit DIY work and require licensed professionals.
If you’ve purchased a home with a cesspool and want to convert it to a septic system, the costs can vary widely. These strategies can help you manage your budget.
Talk to multiple septic system contractors before proceeding with the installation. Many contractors offer different pricing options, services, qualifications, and experience, and considering several options helps you to make an informed and cost-effective decision.
Regulations are in place for a reason, and neglecting them could result in expensive fixes and fines. Make sure to get a percolation test, obtain the correct permit, and comply with all local regulations to avoid unnecessary costs.
Regular maintenance and repairs not only help your septic system perform better but can also extend its lifespan. Avoid premature wear or replacement by getting inspections and maintenance services at recommended intervals.
Gather any paperwork you have relating to your cesspool, previous septic systems, plumbing, or utilities, which can help a pro safely and efficiently complete the job.
Gather multiple quotes, as there might be more than one way to tackle this project.
Familiarize yourself with the different types of septic systems, which a pro can help you choose.
Don’t attempt to dig up any part of your system. The last thing you want is to strike a pipe or the “rainbow roots” of an electrical system.
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 extensively research project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We rely on 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.
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.
I recently moved to another state and chose United Trust Van Lines after comparing several companies. Their team was punctual, professional, and extremely careful with my belongings. I was especially impressed with how they handled my home office setup and fragile items. Everything arrived on...
United Trust Van Lines, LLCPositive experience. As previously stated, the replacement/repair could not be completed (no fault of the plumbing tech) b/c misinformation was rec?d by property management maintenance. Thanks to the plumbing tech for your efforts. Appreciate you!
The WaterworksAs usual with ECO, tech Jordan was outstanding, very professional, very knowledgeable, and very thorough with repairs made to tankless water heaters. Very highly recommend ECO!!!
Eco Plumbers, Electricians, and HVAC TechniciansI would recommend this company to anyone! He showed up on time, was friendly, completed a very difficult repair on our dryer vent cover, was responsive, and pricing was extremely fair and competitive. I would have him back to do any of our repairs or cleanings without hesitation!
U.S.A. Dryer Vent, LLCBest cleaning I've had at my property
I'm a repeat customer of All Star Paving & Sealing and I appreciate the service that all start paving has done for me in the past. I just recently had them out for an estimate and things couldn't have gone better. The staff that they send out to do the estimates are very knowledgeable. The...
All Star Paving and SealingSupreme Brick & Chimney is one of the best service providers I’ve interacted with. Extremely efficient, knowledgeable, and thorough. They took the time to walk me through their detailed full-service inspection and were extremely professional. Not to mention their turnaround time was...
Supreme brick & chimneyThey were great! They were thorough and efficient and paid attention to the details. Definitely recommend. I'm definitely going back!
FIFI'S EARTH FRIENDLY CLEANINGStorms Mobile Welding was great to work with. They were prompt, professional and did an overall excellent job on the project. I highly recommend.
Great experience all together. Dog friendly, courteous, great results and honest with recommendations. Will certainly be using Cardinal in the future for any carpet repairs
Cardinal Carpet Care & RepairFrom average costs to expert advice, get all the answers you need to get your job done.
How much does a septic system cost? Explore impacting factors, important add-ons, and how you can save money on septic system installation right here.
Does your property have poor ground water or soil conditions? Learn about engineered septic system cost, types, and factors for you to consider.
Replacing a drain field requires digging up quite a bit of land and involves a decent amount of testing. Using this guide, you’ll learn how much it costs to replace a drain field based on a few key factors such as size and type of septic system.
Follow this guide to learn how to get rid of a cesspool to save some money and transform your home into a more eco-friendly space.
When it comes to cesspools versus septic tanks, cesspools are less expensive but require more maintenance. Septic tanks are more eco-friendly.
Before buying a house with a cesspool, it’s important to know what you’re getting into. Learn about how cesspools work and what to expect as a new homeowner.
