Professional Septic System Installation in Flathead County

Code-Compliant, Long-Lasting Septic Systems

When you’re building or upgrading a home in Flathead County, a properly installed septic system is essential. Columbia MTN Excavation delivers full-service septic system installation—ensuring every component is installed to code, functions efficiently, and lasts for years to come.


We partner with homeowners, builders, and property managers to deliver clean, dependable wastewater solutions.

Complete Septic Installation Services

We handle every phase of the process with care and precision:

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Site Evaluation & Planning

Before excavation, we assess the soil, slope, and size of your property to determine the best septic system design.

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Excavation for Tanks & Drain Fields

Our team excavates trenches, tanks, and leach fields with precision to ensure proper flow, drainage, and environmental safety.

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Septic Tank Placement

We install concrete, plastic, or fiberglass tanks with proper bedding and backfill for long-term performance.

Grading and Leveling

Proper grading ensures stable construction and efficient water drainage, protecting your property for years to come.

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Drain Field Installation

Our crew designs and installs leach lines or chambers based on your site plan and water table level.

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Permitting Support

We assist with local permitting requirements, ensuring your system is fully compliant with Flathead County regulations.

Ideal for:

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New residential construction

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Rural and off-grid properties

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System replacements or upgrades

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Failed system recovery

Why Choose Columbia MTN for Septic Work?

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Experienced in Local Regulations

We understand the Flathead County health department standards.

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Accurate Excavation


Tanks and trenches are excavated to exact depth and grade.

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Fast Scheduling


We minimize downtime and keep your project on track.

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End-to-End Support


From planning to inspection, we’re with you at every step.

Testimonials

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Columbia MTN Excavation made the whole process easy—from soil testing to final hookup. Highly recommended.

Michael James
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They installed our septic system on time and helped with permits. Very professional team.

James Harold

Schedule Your Septic Consultation

Let’s talk about your site and septic needs. We offer free quotes and fast turnaround.