Septic System Installation and Repair in Corvallis, Montana

Precision Septic Systems Engineered for Lasting Performance

A failing or aging septic system takes over a property, turning simple water use into worry about backups, odors, and what seeps below ground. Doing it right the first time ends that worry for good. At Bohlander Construction, we design, install, and repair septic systems for rural homes and working properties across Corvallis, Montana. From the first soil evaluation to the final grade, we build systems that treat wastewater cleanly and quietly for decades, so your household runs the way it should.


Our septic services run the full range. We install conventional and alternative systems, set and replace tanks, build and repair drainfields, and run sewer and water lines. Landowners in Hamilton, Stevensville, Florence, and Missoula rely on us for the same work. Whether you are placing a system on raw land, upgrading one that no longer keeps up, or saving a drainfield that has begun to fail, we size every component around your home and soil, then meet local code and pass inspection before calling it done.


That standard comes from 13 years of excavation and septic work across the valley, and it shows in sites we leave graded clean. Owning our full fleet keeps our schedule tight and our pricing fair, with no rental machines to wait on. From opening walkthrough to final backfill, you deal with the owner, so nothing gets lost between hands. When your system needs building or rescuing, request a quote on our contact page and we will help you plan it right.

Free Estimate!

For the fastest reply, call or text us 24/7 at 406-381-5633

Free Estimate!

For the fastest reply, call or text us at

Contact Us

Our Septic Services

  • New Septic System Installation

    Building a system from scratch starts with careful layout and excavation. We set the tank, install the drainfield, connect the lines, and backfill to grade. Every component is placed to meet code so wastewater is treated safely and reliably for decades to come.

  • Septic Tank Replacement

    Old concrete or steel tanks eventually crack, corrode, or fail outright. We remove the worn tank, prepare the excavation, and set a sized replacement in its place. Surrounding lines are checked and reconnected, then the ground is restored and left clean and level.

  • Drainfield Installation and Repair

    Wastewater moves from the tank into the drainfield, where soil filters it. We install new fields and repair failing ones that have clogged or flooded, laying pipe at the right depth and slope so effluent disperses evenly and the whole system keeps working.

  • Septic System Design and Soil Evaluation

    Good systems start below the surface. Before any digging, we evaluate soil conditions, water table, and lot layout to choose the right system type. This groundwork shapes tank size, field placement, and design, so the finished install fits your property and passes inspection.

  • Septic Tank Removal and Decommissioning

    Abandoned tanks left in the ground become a hazard over time. We pump, then crush or remove the old tank, and fill the void so the area stays safe and stable. Decommissioning is handled to standard, leaving your property ready for next use.

  • Sewer and Waterline Connections

    Connecting a home to its septic tank and water supply takes precise trenching. We dig, lay, and bed sewer and water lines at the correct depth, then backfill to protect the pipe. Clean connections keep your household running without leaks or settling problems.

Benefits of Septic Systems

Reliable Wastewater Management

You gain a system that quietly does its job every day, moving waste away from your home and treating it in the soil. No backups, no odors, no guesswork. Just steady performance that lets you use water without worrying about what happens underground.

Code Compliant Installations

Meeting local health and building code protects you long after the work wraps up. When your system is installed to standard and inspected, you avoid fines, failed home sales, and rework down the road. You gain confidence that everything sits where regulators expect.

Protection for Property Value

A sound septic system is a selling point, never a liability. Buyers and inspectors look closely at wastewater setups, and a documented, permitted system keeps your land marketable. Putting money into it now safeguards one of the most important features of rural property.

Systems Sized to Your Household

Capacity has to match the home it serves; a tank that fits a small cabin will not serve a full family. We size to your bedrooms and daily water use, so the system handles real demand with fewer backups and longer pumping intervals.

Cleaner Groundwater

When effluent is treated the way it should be, it protects the water beneath your feet. A well designed field filters waste before it reaches the aquifer, guarding your well and your neighbors. That means a healthier property and a safer water supply.

Long Lasting Performance

Careful installation pays off for years to come. A system built on solid soil evaluation, correct sizing, and proper grading can serve your home for decades with only routine care. You spend less time thinking about it and more time enjoying your land.

Testimonials


See What Our Customers Are Saying!

Protect Your Property With Smarter Wastewater Solutions

Clean, dependable wastewater handling is the quiet backbone of any rural home, and it deserves a crew that treats the job seriously. At Bohlander Construction, we install and repair septic systems across Corvallis, Montana with careful soil work, correct sizing, and a job site left tidy when we roll out. Whether you are building new, replacing a tired tank, or rescuing a failing drainfield, we bring the equipment and the direct communication to get it done without surprises. When you are ready to move forward, request a quote or send us the details through our contact page, and we will walk you through the next steps for your property.

Frequently Asked Questions

  • How long does a septic system last?

    With proper care, most septic systems last 20 to 40 years. Concrete tanks often reach 40 years, while a well maintained drainfield serves 20 to 30 years. Routine pumping, inspection, and keeping heavy loads off the field help you reach the upper end.

  • How often should a septic tank be pumped?

    Most households pump their tank every three to five years, and a professional inspection every one to three years is wise. The right interval depends on tank size, how many people live in the home, and the water your household uses each day.

  • What type of septic system is best for my property?

    It depends on your soil, water table, and lot size. Conventional gravity systems suit many sites, while others need mound or alternative designs. With 13 years of local experience, Bohlander Construction evaluates each property in Corvallis, Montana and recommends the system that fits.

  • What size septic tank do I need?

    Tank size is based mainly on the number of bedrooms and expected daily water use, not simply how many people live there today. A larger home needs a larger tank to handle peak flow and keep the system running smoothly for many years.

  • How do I know if I have a septic system?

    Several clues point to one. If you live in a rural area, receive no municipal sewer bill, and draw from a private well, you very likely rely on septic. A tank lid or access riser usually sits about ten feet from the house.

  • What should I never flush into a septic system?

    Only human waste and toilet paper belong in the system. Grease, wipes, coffee grounds, chemicals, paint, and so called flushable products all disrupt the bacteria that break down waste. Keeping these out prevents clogs, protects the drainfield, and extends the whole system life.

  • How do I maintain my drainfield?

    Treat the field gently. Keep vehicles, livestock, and structures off it, direct roof and surface runoff away, and avoid planting trees whose roots invade pipes. Pairing that care with regular tank pumping keeps effluent flowing and prevents the soggy spots that signal failure.

  • Do I need a permit to install a septic system?

    Yes. County health departments require permits and a site evaluation before installation, and rules vary across western Montana. Bohlander Construction handles this process for properties in Corvallis, Montana, arranging the soil work and paperwork so your new system is approved and installed correctly.