Basement Waterproofing Arlington
Basement waterproofing in Arlington for floor water after valley soils saturate, wall damp, and older perimeter drains that were never tied off correctly.
NDS-certified crews, inspection before dig
First we find out how the water gets in: up through the gravel under the floor, from an old perimeter drain that was never hooked up, or from roof water dumped at the footing. Then we lay out an NDS-certified drainage system to move it away. Our crews work out of Lynnwood, and we always inspect before we quote.
Three things owners notice first
Open the one that sounds like your basement, then check it against what you see after a few days of steady rain.
Why basements near the Stillaguamish take on water
Between the river flats and the runoff coming down off the higher ground, a lot of water moves through the soil here. We find the exact way in before anyone talks about digging.
Basement waterproofing Arlington jobs come down to one thing: a basement room you can use without fighting water every winter. Puddles, damp walls and a musty smell all fall under that. Sealing the outside of the foundation down at the footing is a different service, and we link to it further down when that is what the house needs.
Rain this close to the foothills runs heavier than in the lowland cities to the south, and a long soaking storm fills the gravel under many valley lots fast. Water moves quickly through those gravel layers and reaches the slab. On older farm-era houses the perimeter drain often was never connected to anything, so it just holds water at the footing. And if your pump runs but the floor is still wet, the discharge is probably landing right back in the yard. Having a system is not the same as having one that works.
Where the water shows up is the best clue. Damp in the middle of the slab after a long rain is coming from below. A stain on the same wall after every storm points to roof or yard water, or a leak in that wall. A musty basement with no standing water still has a moisture problem, and it will keep ruining carpet and drywall until it is fixed.
You can compare all of our systems on the drainage systems hub. If water is coming up through the floor, the two Field Manual guides at the end of this page explain why.
Four things that put water in local basements
Most wet basements we see in the valley have two or three of these going on at once, so we check every one on the visit.
Saturated gravel and outwash. Much of the valley floor sits on river gravel and glacial outwash, with clay on the rises toward the foothills. When those soils fill up, water finds the cold joint, the pipe holes, and the seam where the wall meets the slab. A coat of sealer on the inside won’t hold back that much water for a whole winter.
Perimeter drains that go nowhere. A lot of the older rural houses here, built from the 1940s through the 1970s, have drain tile that was never tied into anything or has filled with silt, so the water stays at the footing. A drain on the inside can keep the room dry, but if a wall is the main leak, outside work may still be needed.
Roof and hillside runoff. Short downspout extensions, yards that slope toward the house, and runoff from the higher ground all keep soaking the same wall. When surface water is the cause, where that water gets sent is part of the fix.
A pump that can’t keep up. When the basin is undersized, the pump runs nonstop, or the discharge empties beside the foundation, the same water just cycles back in. We match the basin and pump to the water we find and send the discharge well clear of the house.
More on this: hydrostatic pressure after PNW rain and water on the basement floor after rain.
Three ways we dry out a basement
Which one we recommend comes down to where the water gets in: the floor, a wall, or both.
Interior drainage & sump
Perimeter drain pipe set below the slab, running to a sump pit. This is the usual fix for water rising through the floor, and it works when a driveway or deck rules out digging.
Exterior membrane & drain tile
We excavate along the wall, lay fresh drain pipe beside the footing, and put a membrane on the outside. It makes sense when a wall leaks and the side yard gives us room, which is common on bigger valley lots.
Sump & discharge fixes
A bigger basin, backup power, or a new discharge route when the pump runs but the floor still gets wet.
How we decide what your basement needs
There is no standard package. We figure out how the water gets in first and only recommend what fixes that.
On the visit we look at where the downspouts empty, how the ground slopes next to the house, where the walls and floor get wet, what drains and sump are already there, and whether the old perimeter drain was ever connected. The scope we hand you says plainly whether it is inside work, outside work, a sump fix, or a combination done in order, and what each part should solve.
Where people lose the most money is on paint-on sealers and crack injection with no drainage behind them. If water pressure under the slab is the problem, drainage goes in first. If one wall leaks and we can dig, outside work usually holds up longer. If a driveway, deck, or the lot line is in the way, an inside system is often the practical choice.
Basement waterproofing Arlington jobs get scoped after we have seen where the water comes in. If the real need is a full dig with membrane at the footing, to protect the foundation rather than dry a room, we will point you to our foundation waterproofing service instead.
Drying a room vs sealing the foundation
This page covers wet basement living space — floors, walls, smell, seasonal seepage, and the drainage that keeps a room usable. Membrane work at the footing and structural footing drains are a separate job with a separate crew, so they are scoped on their own.
Where we work around town
Valley-floor lots and the newer neighborhoods on higher ground handle water differently, so the fix depends on the house, not the address.
We cover the whole area, from older farm-era houses on the valley floor to the newer master-planned streets of Gleneagle, and we also work in Marysville, Everett, and Stanwood out of our Lynnwood office. Flat valley lots and hillside or daylight basements need different access plans, and we tell you which one you have before work starts.
See every city we cover on our service areas page.
Same service in nearby towns
If you live just past the town line, these pages cover the same work.
We also work in Marysville, Everett, and Mill Creek — same crews, same approach.
Common questions
Quick answers to what homeowners usually ask.
Why does the floor get wet after a long rain? When the ground under the slab is full of water, it pushes up wherever it can, usually at the cold joint along the walls. A drain and a working pump handle that. A coating does not.
Our old perimeter drain was never connected. Will an inside drain still help? Usually, yes, as far as keeping the room dry. The old drain still matters if a wall is leaking, and we will tell you if outside work should follow.
Do I need excavation on a big lot? Not always. An inside system fixes most floor-water problems. Digging makes sense when a wall is the main leak and there is room to get equipment in.
Do the same crews cover Marysville and Everett? Yes. Our north-county jobs run out of the Lynnwood office. Reviews from your neighbors and an inspection tell you more than any web page, so book through contact or call (206) 388-7867.
What does a wet-basement job cost? It depends on the scope. Sealing one crack is a much smaller job than a full interior system or an outside dig, so we give you a price after we have seen the house.
Field Manual guides
Longer guides written from jobs we have done around Western Washington, worth a read before you choose a fix.
Want someone to look at it? We come out, show you what we find, and lay out drainage that matches how the water is getting into your basement, not a one-size membrane pitch. There is more background in the Field Manual.
