Standard & Complex Septic Tank Repair & Installation Services

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We Serve Customers Throughout the Boise Metropolitan Area

Boise - Nampa - Meridian - Middleton - Caldwell - McCall - New Plymouth - Midvale

A3 Underground Construction, Boise, Idaho

Experienced Excavation Contractor & Septic Tank Installer Serving Boise, Caldwell, Nampa & the Surrounding Area

A3 Underground Construction is a fully licensed, highly experienced excavation contractor that specializes in septic system installation, and repair, underground utility trenching, drainage solutions, grading, excavation, and demolition services. We have more than 30 years of industry experience and a reputation for superior workmanship, excellent customer service, and competitive prices. With our diverse range of services, large fleet of excavating equipment, and highly skilled team, A3 Underground Construction is able to meet the needs of residential, agricultural, commercial, and industrial clients throughout Boise, Nampa, Emmett, Meridian, Caldwell, Middleton, Weiser, McCall, Eagle, New Plymouth, and surrounding areas.

High Quality Underground Construction Services for Private Property Owners, Farmers, Ranchers, Building Contractors, and Commercial Businesses

A3 Underground Construction's septic system, trenching, excavating, and drainage solutions include:

  • Standard Septic System Installation & Replacement
  • Complex Septic System Installation & Replacement
  • Aerobic and Nitrogen Reduction Systems
  • Septic Tank Installation
  • Septic Tank Repair
  • Septic Tank Locating
  • Septic Tank Enzyme Treatments
  • Stone Drain Field Design and Installation
  • Leach Line Additions
  • Site Evaluation and Planning Services
  • Storm Water Management
  • Agricultural Field Piping
  • Retaining Ponds, Concrete Spillways, and Culverts
  • French Drains and Trench Drains
  • Grease Traps and Interceptors
  • Sewer Lines
  • Utility Trenching and Digging
  • Joint Trenching
  • Large Cable Trenching
  • Backhoe Services
  • Excavating/Grading

Complete Septic System Planning, Design, and Installation, From Start to Finish

Our dedicated team has the hands-on experience and extensive industry knowledge to install engineered septic systems of all kinds. As a full service septic system installer, A3 Underground Construction can handle every aspect of your project, including initial planning, site evaluation, system design, permitting, trenching and grading, and septic tank and leach field installation. Or, if you prefer, we can work with your current building contractor to install your septic system according to architectural and design specs that you provide.

Certified Complex Septic, Aerobic and Nitrogen Reduction System Installer Serving Boise, Nampa, Meridian, Weiser, McCall, Caldwell, and Surrounding Areas

A3 Underground Construction is certified by the State of Idaho to install, repair, and maintain complex septic systems. We're also a licensed septic system installer for aerobic, microbic, and nitrogen reduction systems. Certain counties in Idaho require these types of complex sewer and septic systems in areas with high ground water or other concerns that can adversely affect the proper functioning of a septic system or underground drainage system. Our experienced team receives continued training in new septic system technology and safety guidelines, and always completes all work according to the industry's best practices and relevant building codes.

Grading, Excavating, and Utility Trenching for Residential, Commercial, and Agricultural Lots

We also offer a full range of excavating, grading, and backhoe services at very reasonable prices. Whether you need lot clearing in Caldwell for your private estate, utility trenching and building pad grading in Boise for new home construction, or dirt compaction and ground leveling in Nampa, we have the skills and expertise to provide a cost-effective, high quality solution.

Give Us A Call Today for a Personalized Consultation and Competitive Quote

Contact A3 Underground Construction today to speak to a member of our knowledgeable staff, who can answer any questions you might have. We offer onsite estimates, personalized consultations, and competitive bids throughout Boise, Caldwell, Nampa, McCall, Weiser, and surrounding areas.

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For fastest response, please call (208) 257-3208, (208) 630-3017


Highly professional, always a great job for a fair price. You can't go wrong with this company for your excavation needs.

Linda Coyle Standifer Via Facebook Review

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10 Reasons to Choose A3 Underground Construction
  • Over 3 Decades of Experience
  • Fully Licensed & Insured Excavation Contractor
  • Locally & Family Owned Business
  • One of the Few Certified Complex System Installers in the Boise Metropolitan Area
  • Extremely Helpful and Knowledgeable Staff
  • We Can Handle Every Aspect of Your Project
  • Complete Site Evaluation and Planning Services
  • Exceptional Workmanship at a Competitive Price
  • All Work Performed in Compliance with Relevant Building Codes & Permitting Regulations
  • Jobs Are Completed On Time & On Budget
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We provide septic, grading, excavation, trenching, and drainage services throughout central and southwest Idaho, including but not limited to:

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