Septic System & Tank Installation Cost Calculator
Homeowners who hired a professional to add or replace a septic tank reported a median cost of $5,800 in 2026 prices; half of the jobs cost $2,300 to $12,500. In the 2023 survey alone the median was $8,700.
United States · hired a pro
$5,800median cost
Half of these jobs cost between $2,300 and $12,500.
191 real jobs from 2017 to 2023, in 2026 prices.
Septic tank cost in each survey
| Survey | Median | Middle half | As reported | Jobs |
|---|---|---|---|---|
| 2019 surveywork done 2017 to 2019 | $4,800 | $1,900–$10,200 | $3,000 | 62 |
| 2021 surveywork done 2019 to 2021 | $5,100 | $1,300–$9,000 | $4,000 | 60 |
| 2023 surveywork done 2021 to 2023 | $8,700 | $3,400–$13,600 | $7,700 | 69 |
Median and middle half in 2026 prices; "as reported" is the median before the price adjustment. How the price adjustment works
Is your septic quote high or low?
| Cost of the job | Share of jobs |
|---|---|
| $500 or less | 6% |
| $1,500 or less | 20% |
| $3,000 or less | 29% |
| $4,000 or less | 39% |
| $6,000 or less | 53% |
| $7,500 or less | 59% |
| $10,000 or less | 69% |
| $15,000 or less | 80% |
| $25,000 or less | 90% |
| $30,000 or less | 96% |
The survey does not record the size of the tank, the type of system or the soil, so a higher quote is not necessarily too high.
Septic tank cost by home size and bedrooms
| Home size | Median | Middle half | Jobs |
|---|---|---|---|
| Under 1,500 sq ft | $4,200 | $2,800–$8,700 | 62 |
| 1,500–1,999 sq ft | $7,500 | $2,900–$18,000 | 32 |
| 2,000–2,499 sq ft | $5,700 | $1,900–$17,000 | 40 |
| 2,500 sq ft or more | $7,400 | $2,500–$14,800 | 53 |
By number of bedrooms
| Bedrooms | Median | Middle half | Jobs |
|---|---|---|---|
| 1 or 2 bedrooms | $5,300 | $3,200–$9,100 | 36 |
| 3 bedrooms | $5,800 | $2,300–$13,600 | 103 |
| 4 or more bedrooms | $5,900 | $1,900–$12,400 | 52 |
Septic tank cost by region
| Region | Median | Middle half | Jobs |
|---|---|---|---|
| NortheastConnecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont | $5,900 | $3,100–$27,800 | 46 |
| SouthAlabama, Arkansas, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia | $4,200 | $1,300–$8,600 | 86 |
| WestAlaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming | $7,400 | $2,800–$18,000 | 32 |
Fewer than 30 jobs, no figure: Midwest (27).
Septic tank cost by age of the home
| Year the home was built | Median | Middle half | Jobs |
|---|---|---|---|
| Before 1960 | $8,600 | $4,900–$18,000 | 46 |
| 1960 to 1979 | $6,800 | $3,900–$13,600 | 54 |
| 1980 to 1999 | $4,000 | $1,800–$9,700 | 57 |
| 2000 or later | $3,200 | $720–$8,700 | 32 |
Septic tank cost in homes with a private well
| Water supply | Median | Middle half | Jobs |
|---|---|---|---|
| Private well | $7,500 | $2,300–$13,400 | 84 |
| Public or private water system | $5,300 | $2,800–$12,500 | 105 |
How homeowners paid for septic tank jobs
| Paid mainly with | Share | Median | Middle half | Jobs |
|---|---|---|---|---|
| Cash from savings | 81% | $5,600 | $1,900–$12,100 | 153 |
| Cash-out refinance | 3% | too few jobs | 5 | |
| Home equity loan | 6% | too few jobs | 10 | |
| Insurance settlement | 2% | too few jobs | 6 | |
| Credit or store card | 2% | too few jobs | 5 | |
| Contractor financing | 2% | too few jobs | 3 | |
| Other | 4% | too few jobs | 7 |
Septic tank: hiring a pro or doing it yourself
84% hired a professional; 16% did most of the work themselves.
| Who did most of the work | Median | Middle half | Jobs |
|---|---|---|---|
| Hired a professional | $5,800 | $2,300–$12,500 | 191 |
| Did most of the work themselves | $1,200 | $740–$4,600 | 37 |
A do-it-yourself cost leaves out the household's own time.
How often homeowners add or replace a septic tank
1.7% of owner-occupied homes on a septic system had this job done in the two years before a survey, by a professional or by the household.
| Year the home was built | Share of homes | Homes surveyed |
|---|---|---|
| Before 1960 | 2.3% | 2,995 |
| 1960 to 1979 | 1.7% | 4,314 |
| 1980 to 1999 | 1.8% | 5,521 |
| 2000 or later | 1.1% | 3,846 |
The same job in homes on a public sewer
| Sewage disposal of the home | Median | Middle half | Jobs |
|---|---|---|---|
| Home on a septic system | $5,800 | $2,300–$12,500 | 191 |
| Home on a public sewer | $4,000 | $790–$8,700 | 82 |
The survey does not say what the jobs in homes on a public sewer were. They are in no other figure on this page.
What counts as a septic tank job in this data
Counted:
- Adding a septic tank to a home.
- Replacing a septic tank.
Not counted:
- Building a new home. The survey asks owners about work on the home they live in.
- Rental homes. Only owners who live in the home are asked about these jobs.
- Routine upkeep such as pumping.
The survey has one line for this job. It does not say whether a job was a tank alone, a tank with its leach field (drain field) or a smaller replacement.
Survey category: "Added or replaced septic tank". Costs the Census Bureau filled in (13% of the professional jobs) are left out.
Where these numbers come from
American Housing Survey 2019, 2021 and 2023 (U.S. Census Bureau and HUD), in 2026 prices by the U.S. Bureau of Economic Analysis price index for home improvements. The calculations are our own; no agency has reviewed or endorsed them. Methodology · Data source