If you’re researching septic system replacement near you, one of the first questions homeowners ask is simple: what actually happens to the old tank? It doesn’t just disappear once a new system goes in. The old tank has to be dealt with properly, and how that’s done depends on your soil, your local regulations, and the condition of the tank itself. Understanding the process ahead of time makes the whole project a lot less stressful.
At Bell Excavating, we’ve handled septic system replacement near you throughout Hudson, Somerset, River Falls, and the surrounding Minnesota and Wisconsin communities since 1997. Here’s a straightforward look at what happens to your old tank once a replacement is underway, so you know what to expect from start to finish.
Signs You Might Need a Septic System Replacement
Before we get into what happens to the old tank, it helps to know why homeowners end up needing a septic system replacement near you in the first place. Common warning signs include:
- Slow drains throughout the house that don’t clear with routine cleaning
- Sewage odors near the tank or drain field
- Standing water or unusually green, spongy patches in the yard
- Frequent backups despite regular pumping
- A tank that’s decades old and made of materials no longer up to code
If your system is showing several of these signs at once, a repair may only buy you a little time. A full septic system replacement near you is often the more reliable long-term fix.
Step One: Pumping and Inspecting the Old Tank
The process always starts with pumping. Every drop of wastewater and sludge has to be removed before anyone can safely work near the tank. Once it’s empty, our crew inspects the tank and the surrounding soil to confirm the scope of the project and check for any additional issues, like a failing drain field or damaged pipes, that should be addressed at the same time.
This step matters for safety and for planning. It tells us whether the old tank can be removed outright or whether it makes more sense to decommission it in place, which is a common approach for older concrete or steel tanks that are difficult to extract.
Step Two: Decommissioning or Removing the Old Tank
Once the tank is pumped and inspected, there are generally two paths forward:
Full removal. The tank is excavated and hauled off the property entirely. This is typically necessary when the new system needs to be installed in the same location, or when local code requires complete removal.
Decommissioning in place. The lid or top of the tank is broken down below grade, the interior is treated, and the void is backfilled with clean sand or gravel. This approach is common when removing the tank would risk damaging nearby utilities or structures, and it still meets local health and safety requirements.
Either way, this stage is where a lot of the physical work happens, and it’s a big part of why septic system replacement near you should always go through a licensed, experienced contractor. Improperly decommissioned tanks can settle over time, creating sinkholes or drainage problems years down the road.
Step Three: Installing the New System
With the old tank out of the way, our team moves into site preparation for the new system. That includes soil evaluation, grading, and confirming the design matches the property’s needs and local permitting requirements. From there, we install the new tank, connect it to the home’s plumbing, and set up the drain field.
Every new installation is built to current SSTS and MPCA standards, so the system is designed to last and to hold up under inspection. Our crews are certified and experienced with septic system replacement near you across both Minnesota and Wisconsin, which means we know the specific code requirements on both sides of the border.
Old Tank vs. New System: What Changes
Homeowners are often surprised by how much has changed in septic technology since their original tank went in, especially if it’s decades old.
| Factor | Old Tank (Typical) | New System |
|---|---|---|
| Material | Steel or older concrete, prone to corrosion | Modern concrete or approved synthetic materials |
| Capacity | Often undersized for current household use | Sized to match household needs and local code |
| Inspection access | Limited or buried access points | Accessible risers for easier future maintenance |
| Code compliance | May predate current SSTS/MPCA standards | Fully compliant with current regulations |
| Expected lifespan | Nearing or past end of service life | Decades of reliable service with proper care |
Common Questions About Septic System Replacement Near You
How long does the process take?
Most residential projects take a few days for the physical excavation and installation, though the full timeline, including permitting, soil testing, and inspections, can stretch to several weeks depending on your county.
Is decommissioning or full removal cheaper?
Decommissioning in place is generally less expensive than full excavation and removal, but the right choice depends on where the new system needs to go and what your local permitting authority requires.
Ready for a Septic System Replacement Near You?
Dealing with an aging or failing septic tank isn’t something to put off. The longer a struggling system sits, the more likely it is to cause backups, yard damage, or costly emergency repairs. If you’re weighing your options for a septic system replacement near you, it helps to work with a team that understands both the removal and the installation side of the job.
Bell Excavating has been serving homeowners across Hudson, Somerset, River Falls, and the greater Minnesota and Wisconsin region since 1997, with certified crews who handle every step from pumping the old tank to backfilling the new drain field. Our septic services cover installation and repair, and our septic pumping team can get your current system emptied and inspected before any work begins.
According to the U.S. EPA, local permitting authorities set the specific rules for how an old septic tank must be handled once it’s taken out of service, so working with a contractor who knows those requirements matters just as much as the excavation work itself.
Ready to talk through your options? Contact Bell Excavating today to schedule your septic system replacement near you.