How much does a septic system cost?
What the parts and the design of a septic system cost, from real prices on landplan.io, what changes the cost, and how to get exact quotes for your property.
The short answer
A septic system's price adds up four things: the parts (tank, pipe, the drain field and any pump or treatment unit), the design, the permit, and the installation. landplan.io has real prices for the first two: what distributors charge for the parts, delivered, and what designers on landplan.io quoted for a design. The permit fee is set by your county. Installation (digging, labor, hauling) depends on the site and the installer, so we don't publish a figure for it: your installer prices it from the design.
What the parts cost, delivered
| Part | Median | Most sell between | Used in | States |
|---|---|---|---|---|
| Aeration Tank | $7,333 | $6,365 – $8,656 | Every system | 1 |
| Septic Tank | $1,769 | $1,677 – $1,926 | Every system | 8 |
| Dose Tank | $1,776 | $1,606 – $1,906 | Pump, mound and pressure systems | 4 |
| Dual Septic Pump Tank | $1,735 | $1,640 – $1,830 | Pump, mound and pressure systems | 1 |
| Gravel | $15 | $15 – $15 | Trench, bed and mound fields | 1 |
| Sand | $9 | $9 – $9 | Trench, bed and mound fields | 1 |
| Pump | $661 | $421 – $1,205 | Pump, mound and pressure systems | 1 |
| Control Panel | $633 | $517 – $1,019 | Pump and aerobic systems | 1 |
| Spray Head | $258 | $254 – $301 | Spray systems | 1 |
The median of distributors' listings on landplan.io (1,090 listings), all sizes together. A bigger house needs a bigger tank and a bigger field.
Septic tank prices by state, month by month · Find septic products and distributors
What a septic design costs
Designers on landplan.io quoted between $250 and $800 for a septic system design: the middle half of 36 quotes, rounded to $50. The system and the site change the price.
| System | Typical quote | Quotes |
|---|---|---|
| Conventional | $250 – $400 | 14 |
| Aerobic + drip | $700 – $800 | 12 |
When you hire through landplan.io you pay the quote plus a landplan.io service fee. Each quote shows what you pay before you accept it.
What changes the cost
- The soil. How fast the soil takes water sets the size of the drain field. Slow soils need a bigger field, or another system such as a mound.
- The house. The number of bedrooms sets the daily design flow, and with it the tank size and the field size.
- The system. Mound, aerobic, drip and spray systems add parts a gravity trench system doesn't need: pumps, dose tanks, treatment units and control panels.
- The site. Slope, the depth to rock or water, and the setbacks from wells, streams, buildings and property lines decide where the system fits, and whether it must pump uphill.
- The local rules. Each state and county sets its own tank sizes, setbacks and allowed systems. landplan.io applies them when it designs.
- Delivery and access. The distance from the distributor and room for the excavator change what the parts and the work cost.
Get exact quotes for your property
Post your job with the address and what you need. Verified designers who serve your county quote a design, and you choose one. Nothing is charged until you accept a quote.
Septic costs by state
| State | Median aeration Tank | Most sell between | Typical design quote |
|---|---|---|---|
| Ohio | $7,235 | $6,044 – $9,015 | $250 – $800 |
Each state's page has its septic rules and every part's price there.
Questions
How much does a septic tank cost?
The median delivered aeration Tank on landplan.io cost $7,333 in October 2026; most sold between $6,365 and $8,656, from 24 distributors' listings. Installation is extra.
How much does a septic system design cost?
Designers on landplan.io quoted between $250 and $800 for a septic design: the middle half of 36 quotes. When you hire through landplan.io, a service fee is added, and each quote shows the total.
Why is there no single price for a whole septic system?
Installation depends on the site and the installer: the soil, the slope, access for the excavator and local labor. We publish what we have real prices for, the parts and the design. Your installer prices the work from the design.
How do I get an exact price for my property?
Post your job on landplan.io with the address and what you need. Verified designers who serve your county quote a design, and you choose one. With the design in hand, an installer can price the work.