Standard & Complex Septic Tank Repair & Installation Services

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Office:Contact A3 Underground, Boise, Idaho Septic Contractor    Cell:Contact A3 Underground, Boise, Idaho Septic Contractor
We Serve Customers Throughout the Boise Metropolitan Area

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

Boise, Idaho Underground Utility Trenching Services

The Best Value in Trenching Services for Boise,
Washington County and Nearby Areas

Boise's Preferred Choice for Underground Utility Trenching, Joint Trenching and Trench Digging

A3 Underground Construction offers comprehensive trenching services for Boise, Nampa, Caldwell, McCall, Weiser, and surrounding areas. Over the last 30 years, our owners have served thousands of satisfied homeowners, farmers, ranchers, and commercial and industrial businesses and built an excellent reputation. We've become known for our expert workmanship, extensive industry knowledge, and honest business practices. Whether you need utility trenching for a new commercial building in Nampa, drainage trenching for your ranchette in Boise, or cable line trenching for your private estate in Caldwell, you can trust that we have the skills and expertise to provide exceptional results at highly competitive prices.

Full Service Residential, Commercial, and Industrial Trench Digging for Utilities and Drainage

As a licensed and experienced excavation contractor, we're able to provide trenching services for a wide range of applications. This includes digging short and long run utility trenches (sewer, water, storm, gas, electric, and telecommunications), joint trenches, large cable commercial and industrial trenches (for up to 4-5 inch conduits), and trenches for retrofit or changed utilities. With our years of industry expertise, we are also experts at site evaluation and planning, and can assist you in designing the best layout for connecting utility lines to septic systems, drainage systems, utility boxes, and more. We can also provide expert construction trenching for retaining walls, concrete footings, and foundations.

Code-Compliant Trenching at Affordable Rates for Industrial Facilities, Ranches, Farms, Commercial Properties, Private Estates, and More

At A3 Underground Construction, we understand the need for reliable workmanship that will be long-lasting, code-compliant, and completed according to your required design specs. That's why we always follow the industry's best practices, and go the extra mile to ensure complete customer satisfaction. Because we are a full-service underground construction company, we can handle all the details, including pulling permits, installing utilities for new construction, and integrating your utility trenching into a new or existing septic system. After all utilities have been installed and hooked up to your utility or power panel, we will arrange for an inspection and close the trench after it has received approval.

Call Today for an Onsite Estimate and Accurate Quote On Trenching for Phone Lines, Cable, Telecommunications, Sewer, Water, Gas, Electric, and Storm Systems

Contact us today to schedule an onsite estimate and competitive quote. Our helpful and knowledgeable staff would be pleased to answer any questions you might have about our cost-effective trenching, excavating, and septic system services.

Why Choose A3 Underground Construction

  • Licensed and Insured Excavation Contractor
  • Over 30 Years of Experience
  • Code-Compliant Utility Trenching for Water, Sewer, Storm, Gas, Electric, Phone, and Cable
  • Joint Trenching For Multiple Utility Lines
  • Large Cable Commercial & Industrial Trenching
  • Trench Digging for Ponds, Drainage Systems, Culverts, and Well-to-Field Piping
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For fastest response, please call (208) 257-3208, (208) 630-3017


They have done many jobs for me and friends Always happy with the work done!

Susan Haggard Via Facebook Review

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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We provide septic, grading, excavation, trenching, and drainage services throughout central and southwest Idaho, including but not limited to:

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