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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; and snow plowing and removal services throughout Boise, Nampa, McCall, New Plymouth, Midvale, Middleton, Meridian, and surrounding areas.
