How much does a septic system cost?

A conventional septic system runs about $5,000–$12,000 installed. Mound and aerobic systems for difficult soils cost more.

What determines septic system cost?

Soil conditions (percolation test), system type, tank size, and local permit requirements are the main cost drivers.

📁 theHomework.ca_□×

Cost to install a new septic system.

Planning a general contractor project?

Tell us what you need and local pros will get in touch. Free, no obligation.

System type

Save your results to your home — free.Open the full tool →

Tired of calling around? Post your project once and let local pros come to you.

How much does a septic system cost?: A conventional septic system runs about $5,000–$12,000 installed. Mound and aerobic systems for difficult soils cost more.
What determines septic system cost?: Soil conditions (percolation test), system type, tank size, and local permit requirements are the main cost drivers.