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 Ada County, Idaho

Boise - Eagle - Meridian - Kuna - Star - Garden City - Hidden Springs

Experienced Septic System Installation & Repair Company Serving Boise, Eagle, Meridian, and Nearby Areas

A3 Underground Construction provides the best value in septic system installation and repair in Boise, Eagle, Meridian, and surrounding areas of Ada County. We also provide high-quality utility trenching, excavation, grading, demolition, and drainage installation services.

We are a fully licensed and insured septic system and excavation contractor with over 30 years of experience and thousands of satisfied customers. From complex septic system installation in Boise and sewer line trenching in Eagle, to culvert design and installation in Meridian, we can do it all. Whatever the scope of work, large or small, our dedicated team always delivers expert workmanship and professional customer service at a very competitive price. That's why we are trusted by countless private property owners, ranchers, farmers, agricultural concerns, and commercial businesses throughout Eagle, Boise, Meridian, and nearby areas of Idaho.

Our full range of services include, but are not limited to:

  • Septic System Planning, Design, Installation, and Repair
  • Septic Tank Installation and Replacements
  • Aerobic, Nitrogen Reduction, and Microbic Septic Systems (Installation, Repair, and Maintenance)
  • Septic Tank Installation
  • Septic Tank Repair
  • Septic Tank Locating
  • Septic Tank Lid and Riser Installation/Replacements
  • Stone Drainfield Installation & Repair
  • Leach Line Additions
  • Trench Drains and French Drains
  • Well-to-Field Piping
  • Culverts, Retaining Ponds, & Adjustable Concrete Spillways
  • Grease Traps, Interceptors, and Sewer Line Installations
  • Utility Trenching for Water, Sewer, Storm, Gas, Electric, and Cable
  • Joint Trenching & Large Cable Trenching
  • Backhoe and Demolition Services
  • Excavating and Grading for Driveways, Building Sites, Walkways, and More

Comprehensive Septic Tank System Design and Installation for Boise, Eagle & Median Properties

Farms, Ranches, Ranchettes, Industrial Facilities, Warehouses, Commercial Buildings, Homes, and Estates

From site planning, drain field design, and permitting, to excavating, placing the septic tank, and hooking up the system, A3 Underground Construction is the best choice for complete sewer system design and installation services in Boise, Eagle, Meridian, and surrounding areas. We're also one of the few septic tank installers serving the Boise area that is certified by the State of Idaho to install both standard and complex septic systems, including aerobic, microbic, and nitrogen reduction systems. Our experienced staff can handle all the details from start to finish, whether you need an entirely new septic system for your ranch in Eagle, leach line additions for your private estate in Meridian, or an at-grade soil absorption system in Boise. We always follow the industry's best practices and comply with all relevant city and county building codes. Call us today to schedule an on-site consultation. While we are experts in designing custom septic and sewage systems, we are also able and willing to work with existing design specs from your preferred building contractor.

Certified to Install, Repair & Maintain Complex Septic Systems, Including Aerobic, Nitrogen Reduction, Microbic, Large Soil Absorption Systems, and More Throughout the Eagle, Meridian and Boise Area

A3 Underground Construction is a state-certified complex septic system installer in Boise, Eagle, and Meridian for the installation, repair, and maintenance of aerobic, microbic, and nitrogen reduction systems, large soil absorption systems, and other complex septic systems. Because we have gone through specific training in these advanced sewer management systems, we are fully versed in all the regulatory codes and best practices that are required for proper installation and maintenance. Whether you have high groundwater concerns, uneven and rugged terrain, or a requirement from the County to install a complex septic system, we have you covered. Simply give us a call to schedule a convenient onsite estimate anywhere in or near Eagle, Boise, and Meridian. One of our knowledgeable estimators will visit your location and provide you with a personalized consultation and competitive bid.

High Quality Trench Digging, Excavating, Grading, Demolition, and Backhoe Services for Meridian, Eagle, and Boise, Idaho Customers

As a demolition contractor with over three decades of experience, A3 Underground Construction can provide a full range of grading, excavating, utility trenching services, and more. Our excavation and demolition services include:

  • Grading for driveways, walkways, and building pads
  • Tree removal and land clearing
  • Home demolition services
  • Excavating for ponds, sewers, and drainage systems
  • Trench digging for sewers, utilities, and irrigation systems
  • Building site prep
  • Backhoe services
  • Ground leveling and dirt compaction services
  • Swimming pool removal
  • Debris hauling and removal
  • Digging for concrete footings, retaining walls, and foundations

Cost-Effective Agricultural Drainage Solutions, From Culverts, Concrete Spillways, and French Drains, To Retaining Ponds and Individual Lagoons

Whether you need to install a retaining pond for your ranch in Boise or repair a culvert on your estate in Eagle, our experienced team has the skills and expertise to get the job done quickly, efficiently, and affordably. Our stormwater and drainage systems are crafted from high quality steel, concrete, plastic, or galvanized metal, and are specifically designed and constructed to ensure ideal grading and drainage. Because we use the industry's best practices and superb attention to detail, you can rest assured that every drainage system we install or repair is built to be long lasting, durable, and high functioning.

Call Today! We Offer Competitive On-Site Estimates and Personalized Consultations for Our Excavation & Septic Tank Services Throughout Eagle, Meridian, and Boise, Idaho

Contact us today to speak to a member of our friendly and knowledgeable staff, who can answer any questions you might have about our comprehensive septic system installation and repair services, agricultural drainage solutions, or demolition, grading, and excavation services. We serve residential, agricultural, and commercial clients throughout Boise, Eagle, Meridian, 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 & Installed 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 Ada County, including but not limited to:

  • Boise, ID
  • Blacks Creek, ID
  • Eagle, ID
  • Garden City, ID
  • Hidden Springs, ID
  • Kuna, ID
  • Meridian, ID
  • Mora, ID
  • Orchard, ID
  • Owyhee, ID
  • Pleasant Valley, ID
  • Regina, ID
  • Sonna, ID
  • Star, ID
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