Stormwater Drainage and Erosion Control in King County WA
Protect your home or job site from water damage with expert drainage and erosion solutions built for the Pacific Northwest.
the "problem" of stormwater damage to property.
The Hidden Cost of Stormwater
What Stormwater Is Doing to Your Property (Even If You Can’t See It) When rainwater has nowhere to go, it doesn’t just make a mess — it destroys everything in its path.
Cracks in your foundation that cost thousands to repair
Flooding under your home that breeds mold and mildew
Soggy lawns that never dry out
Erosion that weakens fences, driveways, and retaining walls
Damage that lowers your property value
Most homeowners don’t realize the damage until it’s too late — and the bill is massive. But all of it is preventable.
Washington State Certified Erosion & Sediment Control Lead
Seattle RainWise Certified
Woman-Owned Business
200+ Homeowners Served | 55+ Reviews
About Sandbagger Northwest
Based in Seattle and proudly woman‑owned, Sandbagger Northwest delivers expert drainage and erosion control backed by experience, certifications, and a commitment to doing the job right.
We don't cut corners — we dig trenches, install the right systems, and solve water problems for good.
Drainage and Erosion Control for Homeowners & Contractors
Protect your home or job site from water damage with expert drainage and erosion solutions built for the Pacific Northwest.
Residential Services
Custom Drainage Systems for Your Home
If you’re tired of standing water, soggy grass, or damp basements — we can help. Our residential drainage services are designed to move water away from your home and yard, safely and permanently.
French Drains
Capture and redirect groundwater before it damages your foundation or yard.
Underground Downspout Drainage
Bury gutter lines to prevent puddles and protect landscaping.
Drywell Systems
Soak up and slowly release water from low areas that never dry out.
Trench and Channel Drains
Eliminate surface runoff from driveways, patios, and sidewalks.
Catch Basins
Collect water and debris before they cause erosion or flooding.
Yard Grading & Sloping
Re-shape your lawn or landscape so water flows where it should.
Each system is tailored to your property’s layout, soil, slope, and runoff issues — and installed to last.
Commercial Services
Stormwater Compliance and Erosion Control
We install BMPs, manage SWPPP plans, stabilize soil, and build retention systems that meet city and county standards.
Why Choose Sandbagger
Built for Western Washington And Built to Last
When it comes to drainage and erosion, shortcuts lead to costly repairs. That’s why Sandbagger Northwest uses proven systems, high-quality materials, and deep local knowledge to do it right the first time.
Underground Downspout Drainage
Bury gutter lines to prevent puddles and protect landscaping.
Drywell Systems
Soak up and slowly release water from low areas that never dry out.
Trench and Channel Drains
Eliminate surface runoff from driveways, patios, and sidewalks.
Catch Basins
Collect water and debris before they cause erosion or flooding.
Our Process
How We Work
Discovery
We inspect your site, walk the property with you, and identify the real problem.
Planning
We design a smart drainage or erosion solution tailored to your landscape and goals.
Execute
We install using professional-grade materials, the right slope, and the right system.
DELIVER
We finish clean, make sure it works, and stand behind the results.
Featured projects
our Work
We take pride in the drainage systems and erosion control solutions we install across King County. From small residential fixes to large commercial builds, Our Work speaks for itself.
French Drain Installation
Burien, WA
Drywell System
Seattle, WA
Trench Drain for Driveway
Renton, WA
Soil Stabilization Project
Kent, WA
Locations / Service Area
Proudly Serving King County and Greater Seattle
From soggy backyards in Burien to large commercial sites in Renton, we’ve helped homeowners and contractors all over King County fix their water problems for good.
Seattle
Burien
RENTON
KENT
DES MOINES
SHORELINE
TUKWILA
Bellevue
Federal Way
REVIEWS
What Our Clients Are Saying
lisa m.
After years of dealing with a wet basement, Sandbagger came in and fixed it for good. The French drain works perfectly and the yard looks great too
mike b.
Fast, professional, and the only crew that actually knew how to fix my slope drainage issue.
Richard Horton
Can’t recommend them enough. Super clear process and great results. Worth every penny.
FAQs
Frequently Asked Questions
How do I know if I need a French drain?
Look for soggy grass, pooling water, or signs of water near your foundation — these are common signs you need better yard drainage.
Do you pull permits?
Yes, we handle permits as needed based on local city or King County requirements. We’ll walk you through what’s required during the quote process.
What areas do you serve?
We serve all of King County, WA — including Seattle, Burien, Renton, Kent, Des Moines, Shoreline, Tukwila, Bellevue, and surrounding areas.
How much does drainage installation cost?
Pricing depends on the size of the system, type of drainage, and site conditions. We provide free quotes and custom recommendations based on your property.
What type of maintenance is required?
Most systems require little to no maintenance, but we recommend seasonal checks to ensure everything is flowing properly — especially before heavy rain.
Are your systems covered by a warranty?
Yes. We back our installations with a workmanship guarantee and use high-quality materials built to last in the Pacific Northwest climate.
Stop Water Damage Before It Starts
Protect your home, your yard, or your build site with expert drainage and erosion control from Sandbagger Northwest.