Mold Removal · Arlington, WA
Mold Removal in Arlington, WA — From Flooded Crawl Spaces to Damp Attics
A musty smell after heavy rain usually means moisture has found a place to sit. In Arlington, that place is often a crawl space the Stillaguamish soaked, or an attic above a steamy bathroom. TDC Clean & Dry removes mold across Arlington from our base in Stanwood, and we fix the water that fed it.
Local conditions
Why mold takes hold in Arlington homes.
Downtown Arlington sits on a bluff above the spot where the North and South Forks of the Stillaguamish meet. That geography splits the city's mold problems into two kinds. Homes in the low ground along State Route 530 near Twin Rivers Park face floodwater. Homes up on the bluff and out in the subdivisions face slow, seasonal moisture instead.
Most of Arlington's housing is young. Half of the homes here were built in 1996 or later, and about 59 percent went up between 1990 and 2009. Many homes of that era sit over vented crawl spaces and have tightly insulated attics. When winter rain keeps the crawl space damp, or a bath fan vents into the attic, mold follows.
Old Town adds a third pattern. Arlington was incorporated in 1903, and about one home in nine here predates 1960. Those older houses often have plaster walls, original framing and little in the way of vapor control.
The wettest months run from October through March. Those are also the months windows stay shut and indoor humidity climbs. Cooking, showers and drying laundry all add water to the air, and a cold crawl space or attic is where it condenses. That is why the same houses tend to smell musty every winter until the moisture source is fixed.
The local data
Arlington mold risk by the numbers.
The public data on Arlington points one way. Rain arrives often, homes are built tight, and the river floods on a regular cycle. Snohomish County emergency managers say the valley typically floods every three to five years.3
- Average yearly precipitation at Arlington's NOAA station1
- 49 in
- Median year Arlington homes were built; 59% date from 1990 to 20092
- 1996
- Stillaguamish crest at Arlington on Dec. 5, 2023, against a 14 ft flood stage3
- 21.34 ft
- EPA's window to dry wet materials before mold starts to grow4
- 24–48 hrs
Rain falls on about 119 days a year here, so crawl spaces rarely get a long dry spell.1 The river topped its 19 ft major flood stage again in December 2025.3 Two major floods in three winters leave little time for soaked materials to dry out on their own.
Highest: Nov at 7.15 in. Lowest: Jul at 1.15 in.
View data table
| Month | in |
|---|---|
| Jan | 5.92 |
| Feb | 4.42 |
| Mar | 5 |
| Apr | 4.34 |
| May | 3.43 |
| Jun | 2.66 |
| Jul | 1.15 |
| Aug | 1.34 |
| Sep | 2.49 |
| Oct | 4.94 |
| Nov | 7.15 |
| Dec | 6.15 |
Sources
- 1. NOAA NCEI, U.S. Climate Normals, Arlington, WA (station USC00450257) (1991–2020 normals)
- 2. U.S. Census Bureau, American Community Survey 5-year estimates, Arlington city, WA (2024)
- 3. National Weather Service gauge ARLW1 and Snohomish County Emergency Management, as reported by KOMO News, FOX 13 Seattle and the Lynnwood Times (2023 and 2025)
- 4. U.S. EPA, A Brief Guide to Mold, Moisture and Your Home (current guidance)
Smelled something musty since the last high water?
Floodwater and wet-season damp both leave mold where you cannot see it. We can trace the moisture, show you what we find and explain your options before any work begins.
Our process
How we remove mold in Arlington.
Every Arlington job follows the same order: find the water, seal off the area, remove the growth, then dry and confirm. What changes is where we look first, and that depends on your neighborhood and your home's age.
- 01
22 minutes from Stanwood to your door
Our crew drives about 22 minutes from our Stanwood base to Olympic Avenue, by way of 300th Street NW and I-5. On the first visit we trace moisture with meters and thermal imaging before we judge a single stain.
- 02
Crawl space or attic first, by decade
In a 1990s or 2000s home near Gleneagle or Kent Prairie, the vented crawl space and the attic are the likeliest sources. In an Old Town house, we start with the basement walls and the plaster instead.
- 03
Sealed off before anything comes out
Plastic sheeting closes off the work area, and HEPA air filtration keeps it under negative pressure. About 38 percent of Arlington households rent, so we line up access and approvals with the property owner when needed.
- 04
Removed, cleaned, then proven dry
Moldy drywall and insulation are bagged and taken out, and the framing behind them is cleaned. Dehumidifiers run until a moisture meter reads dry, because roughly 119 rainy days a year will revive anything left damp.
- 05
Put back by the crew that took it out
Once the area is clean and dry, the same crew rebuilds the walls, floors or cabinets we removed. You deal with one company from the first call after a flood to the final coat of paint.
Warning signs
Signs your Arlington home needs mold removal.
Mold rarely announces itself with a black patch on the wall. In Arlington homes, the early signs tend to show up where water collects after rain or high water.
A musty smell that returns every November
If the smell fades in August and comes back with the fall rain, moisture is feeding it. November is Arlington's wettest month, averaging 7.15 inches of precipitation.
Damp insulation or white growth under the floor
Crawl space insulation that sags, drips or shows white, fuzzy growth is holding water. Vented crawl spaces are prone to it through a long wet season.
Dark spotting on attic sheathing or nails
Frosty or rusted nail tips and dark spots on the roof sheathing mean warm, wet air is reaching the attic. A bath fan that vents into the attic instead of outside is a common cause in newer homes.
Stains or warping after the river rises
If Stillaguamish floodwater reached your crawl space, garage or lower floor, assume materials stayed wet longer than they looked. EPA advises drying water-damaged areas within 24 to 48 hours to prevent mold.
Peeling paint or soft plaster in an older home
Bubbling paint and soft plaster often mean water is moving through the wall. In houses built before 1960, it pays to check behind the finish rather than paint over it.
Why us
Why Arlington homeowners call TDC Clean & Dry.
Plenty of companies list Arlington as a service area. Here is what our crew does differently when the job is here.
IICRC-trained crew, 22 minutes up the road
Our technicians hold IICRC certification, and they work out of Stanwood, about 22 minutes from downtown Arlington. You get trained hands close by instead of a crew driving up from the Seattle area.
Flood mold handled with the river in mind
After a Stillaguamish flood, we treat crawl spaces and lower floors as contaminated, not just wet. County emergency managers expect the valley to flood every three to five years, so we plan for the next one too.
Insurance paperwork for Arlington claims
We bill insurance directly and document every job with photos and moisture readings. Flood damage usually needs its own policy, so we help you sort out what is covered before work starts.
One crew from removal to Old Town rebuild
The same crew that removes the mold rebuilds what came out, from a Gleneagle bathroom to an Old Town basement wall. You never have to hire a second contractor to finish the job.
Around Arlington
Arlington neighborhoods we serve.
We work across Arlington and the rural roads around it. Each part of town tends to show mold in its own way.
Old Town
Arlington's historic core along Olympic Avenue holds many of its oldest homes. Here we look at basements, plaster and framing that predate modern vapor barriers.
Gleneagle
The larger homes around Gleneagle Golf Course have big attics and several bathrooms. That combination makes attic ventilation and bath fan routing the first things we check.
Kent Prairie
South of Old Town, Kent Prairie's flat ground was once open prairie. Many homes on level ground like this sit over crawl spaces that stay damp through the long wet season.
Smokey Point
Near I-5 and State Route 531, Smokey Point is the city's commercial hub, with neighborhoods close behind it. We handle homes and businesses here, since a slow leak breeds mold in an office as easily as a house.
Arlington Heights
East of town, Arlington Heights sits on larger lots in the river valley. When the Stillaguamish flooded pastures and ballfields here in December 2023, crawl spaces and outbuildings needed checking afterward.
Arlington FAQ
Mold Removal questions in Arlington, WA
Straight answers to the questions Arlington homeowners ask most about mold removal. If yours is not covered here, call and ask the crew directly.
How much does mold removal cost in Arlington?
Cost depends on how much material has to come out, where the mold is and how far the moisture spread. The on-site inspection is free, and you get a written scope and price before any work starts.
Is mold a problem in Washington state?
West of the Cascades it can be, because the air stays damp for months. Arlington averages about 49 inches of precipitation a year, and EPA recommends keeping indoor humidity below 60 percent to limit mold.
Can I clean mold myself?
For small patches, often yes. EPA says a homeowner can usually handle an area under about 10 square feet, roughly 3 feet by 3 feet. Mold from floodwater, or mold inside walls or ductwork, is better left to a professional.
Does homeowners insurance cover mold after a Stillaguamish flood?
Standard homeowners policies usually exclude flood damage, which falls under separate flood insurance. We document the damage, bill your insurer directly and walk you through what your adjuster needs to see.
How fast should I act after water gets into my crawl space?
Quickly, because EPA advises drying water-damaged materials within 24 to 48 hours to prevent mold. Our emergency line is answered 24/7, and the drive from Stanwood takes about 22 minutes.
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Get help now
Is the Stilly leaving mold behind in your Arlington home?
Call (206) 719-4508 or book an inspection online. We will find the moisture, show you the mold and give you a written plan before anything is removed.
(206) 719-450824/7 emergency line · Monday – Sunday 8:00 am – 4:00 pm · Free inspections
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