A3 Underground Construction

We’re a licensed and experienced excavation and septic system contractor that serves Boise, Nampa, McCall and surrounding areas. 

A3 Underground Construction is a licensed and insured excavation and septic system contractor with over 30 years of experience. We are fully qualified to provide septic system installation and repair; underground drainage solutions; utility and joint trenching; grading, demolition and excavating throughout Boise, Nampa, McCall, New Plymouth, Midvale, Middleton, Meridian, and surrounding areas.