Septic tank cost: what owners paid
When owners hired someone for a septic tank, the middle half paid $2,900 to $10,000 and the typical job cost $5,200. Counting do-it-yourself jobs, the typical job was $5,000.
What owners paid
$5,200
The typical job when owners hired it out. The middle half paid $2,900 to $10,000.
Every job, do-it-yourself included: $5,000 typical.
Hired out, by home size: the typical job and the middle half
- Under 1,500 sq ft$2,900$1,000 to $6,700
- 1,500 to 2,499 sq ft$6,700$3,900 to $11,400
- 2,500 sq ft or more$7,100$4,300 to $13,000
Source: U.S. Census Bureau, American Housing Survey 2023, the latest release: work owners did in about 2021–2023. Our percentiles from the survey’s public use file, checked October 11, 2026.
When owners hired the work out
88% of these jobs were hired out. The survey sample is too small for a hired-out figure in any one metro; the national figures by home size are in the table.
The hired-out figures as a table, with margins of error
Scroll the table sideways to see every column on a small screen.
| Homes | Sample jobs | 25th percentile | Median | 75th percentile |
|---|---|---|---|---|
| Every home size | 111 | $2,900 ±$692 | $5,200 ±$1,553 | $10,000 ±$2,504 |
| Under 1,500 sq ft | 39 | $1,000 ±$1,365 | $2,900 ±$837 | $6,700 ±$2,668 |
| 1,500 to 2,499 sq ft | 36 | $3,900 ±$1,019 | $6,700 ±$2,100 | $11,400 ±$2,930 |
| 2,500 sq ft or more | 32 | $4,300 ±$1,872 | $7,100 ±$2,932 | $13,000 ±$5,094 |
What these figures cover: Septic tanks added or replaced, as the Census survey asks it. The survey does not record whether a job also included a new drain field, so a whole new system can cost more than these figures.
How these figures are made: from the Census Bureau's 2023 American Housing Survey public use file, each job counted with its survey weight and a 90% margin of error from the survey's replicate weights. A job is hired out when the owners said someone outside the household did most of the work. The public file rounds costs.
What moves the price
- The tank size, set by the number of bedrooms and the county’s rules.
- The soil test (percolation test) and the design the county approves.
- Whether the drain field is reused, repaired or replaced; a new field is often the bigger part of the job.
- Access for the excavator, rock and a high water table.
- Permits, inspections and putting the yard back.
Before you compare quotes
Ask every contractor to price the same scope, in writing. Do the quotes cover the same tank size and material, the same drain field work, the permit and inspections, and putting the yard back?
Put the quotes side by side in the quote worksheet, or keep every price for the project in a budget worksheet.