Septic System Installation — Compare Local Installers
New septic tank being installed
Building a home, replacing a failed system, or upgrading an old tank? Septic installation is a major job that needs permits, soil testing and a licensed contractor. Compare local installers and get multiple quotes.
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When you need a new system
- New construction outside the sewer grid
- A tank or drain field beyond repair
- Adding bedrooms/bathrooms beyond system capacity
- Converting from an old cesspool or failing system
How much does a septic system cost installed?
A conventional system typically costs $3,500–$12,000 installed. Engineered systems (mound, aerobic/ATU) needed on difficult soils run $10,000–$20,000+. Soil conditions and county permit costs drive the price.
Watch: understanding septic systems (This Old House)
understanding septic systems (This Old House)
Related services
Frequently asked questions
Do I need a permit? Yes — septic installs are permitted and inspected at the county level in every state.
How long does a septic system last? A well-maintained conventional system lasts 25–40 years; drain fields 20–30.
Find a septic installer in your area — choose your city from the menu above.