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Septic System Replacement in Whatcom County
When a system is genuinely finished. Old one decommissioned, new one designed and permitted, and the yard put back.
- Confirmed as beyond repair before we quote
- Old tank decommissioned properly
- Design and county permit handled
- Ground reinstated, not just backfilled
Replacement is the right answer less often than it is quoted
This is the biggest bill on the site, so it deserves the most scepticism. Before anyone replaces a system, three things should have been ruled out: an overdue tank feeding solids into the field, a mechanical failure such as a pump or a blocked filter, and groundwater overwhelming a field that would otherwise be fine.
We rule those out first, on every job, because a replacement quoted without that work is a guess with a large number attached.
Sometimes the answer really is replacement. Tanks crack and fail structurally. Drain fields that have been fed solids for two decades have clogged soil that will not recover. Systems installed to standards from fifty years ago are sometimes simply undersized for a house that has been extended twice.
When that is the case, the job is bigger than digging a hole. There is a design, a county permit, the old system to decommission properly, and a yard to put back together. We handle all of it as one piece of work.
What we handle
Full system replacement
New tank and new drain field where both are finished, including decommissioning the old tank to the required standard rather than leaving it in the ground as a hazard.
Drain field only replacement
Where the tank is sound and only the field has failed. Cheaper, faster, and far more common than full replacement. Covered in more depth on our drain field page.
Upgrades and system type changes
Where the original system type is no longer viable on the site, replacing it with pressure distribution, a sand filter or a mound. This is often the outcome on wet or tight lots.
What is included
Confirmation that replacement is necessary
Tank assessed, mechanical causes ruled out, groundwater separated from failure. If we can save it we will tell you.
Site evaluation and design
Soil testing, usable area established with setbacks respected, and a system designed for what the ground will actually accept now rather than what was acceptable decades ago.
Permit and decommissioning
County permit package prepared and submitted, and the old tank pumped, crushed or filled and decommissioned to the required standard.
Installation and reinstatement
New system installed, county inspection attended, and the ground genuinely restored rather than left as a mound of spoil and rutted grass.

How a replacement runs
Assessment
Confirming the system is genuinely at the end, with the reasoning explained and the cheaper alternatives explicitly ruled out.
Site evaluation
Test pits and soil logging, groundwater assessment, and establishing where a new system can legally and practically go.
Design and quote
System type and layout, and an itemised number covering decommissioning, installation and reinstatement.
Permit
Submitted and followed through county review.
Decommission and install
Old system decommissioned, new tank and field installed, inspected.
Reinstatement and records
Ground restored, and you get the new as-built. Keep it somewhere findable.
Why replace with us
We try not to. That is a strange thing for the replacement page to say and it is the most useful thing on it. The incentive in this trade runs the wrong way: the largest job is the one with the least diagnostic work behind it. Ruling out the cheap causes first is how we would want to be treated.
We decommission the old tank properly. An abandoned septic tank left in the ground is a genuine collapse hazard, and it will surface as a problem at the next property sale. It gets pumped and crushed or filled, and it goes on the record.
We put the ground back. A replacement tears up a substantial part of a yard. Backfilling is not the same as reinstating, and the difference is obvious for years afterwards.
And we are realistic about winter. Heavy excavation on saturated ground makes a worse mess and sometimes a worse result. If a job should wait for drier weather and it safely can, we will say so.
Dispatch
Been told you need a new system?
Get a second opinion before you commit. Sometimes it is correct. Often the cheaper causes were never checked.
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Septic replacement questions
How much does a new septic system cost in Washington?
Wide range, driven by soil, system type, access and whether an engineered system is required. Our cost guide sets out what moves the number.
How many years does a septic tank usually last?
A concrete tank can last several decades. The drain field usually reaches the end first, which is why field only replacement is far more common than full replacement.
Is it illegal to sell a house with a failed septic system?
You cannot conceal one, and a transfer generally cannot complete with an unresolved failure. In practice it becomes a negotiation: fixed before closing, or reflected in the price with the work documented.
Can I install my own septic system in Washington state?
Design, permitting and installation are regulated, and this is not realistically a homeowner project. An unpermitted system creates problems at resale as well as health and legal exposure.
What happens to the old septic tank?
It has to be decommissioned rather than abandoned: pumped out, then crushed or filled so it cannot collapse. Leaving it intact and buried is both a hazard and something that will surface during a future sale.
Can a septic drain field be repaired instead of replaced?
Sometimes. It depends on whether the soil itself has clogged or whether the field is being overwhelmed by something upstream or by groundwater. That is exactly what the assessment is for.
Where we replace systems
We cover Bellingham, Lynden, Ferndale, Blaine, Birch Bay, Everson, Nooksack, Sumas, Deming, Custer, Sudden Valley and Point Roberts.
View service areas- Bellingham
- Lynden
- Ferndale
- Blaine
- Birch Bay
- Everson
- Nooksack
- Sumas
- Deming
- Custer
- Sudden Valley
- Point Roberts
Book a replacement assessment
Tell us what has happened, and if you have already had a quote elsewhere, tell us what it said.
Call(360) 555-0147Mon to Fri, 7am to 5pm, with emergency service outside those hours.
- Same day emergency response
- The tank gets inspected while the lid is off
- Written reports the county and escrow accept
- No call out fee on a booked job
Request logged
Thanks. We will give you a time and a price.
If it is an emergency, call rather than waiting for a reply.
(360) 555-0147