Drywell Installation in Seattle & King County WA
Fix standing water and manage runoff with a drywell system built to drain deep and last long.
Sandbagger installs custom drywell drainage systems that collect and filter excess water below the surface — keeping your yard and foundation dry all year.
What is a Drywell?
How a Drywell Solves Drainage Problems
A drywell is an underground structure that collects stormwater or runoff and slowly disperses it deep into the surrounding soil. It’s ideal for homes with:
Pooling water in low areas
Downspouts draining too close to the house
Soil that drains poorly or stays saturated
Runoff from patios, driveways, or hardscapes
No city storm drain connection nearby
Drywells are efficient, eco-friendly, and highly effective in Washington’s wet climate.
What’s Included
What You Get With a Sandbagger Drywell Install
Every system we install is tailored to your yard’s unique water flow and soil type. Our process includes:
On-site drainage inspection
Excavation and proper drywell sizing
Filter fabric, clean gravel, and flow pipe installation
Surface tie-ins from downspouts or trench drains
Optional overflow or backup discharge lines
Full site restoration with grading
We install both single and multi-well systems depending on your drainage volume.
Is a Drywell Right for You?
When to Choose a Drywell Over Other Drainage Options You’ll benefit from a drywell if:
Your property has no slope or limited gravity drainage
You don’t have access to storm drains or city tie-ins
Rainwater pools in flat areas or flower beds
Your soil stays soggy days after a storm
You’re trying to reduce surface runoff near your foundation
Why Work With Sandbagger
Local Expertise. Better Materials. Long-Term Results.
Woman-owned, Seattle-based, and RainWise-certified
WA State Certified Erosion & Sediment Control Lead
200+ residential systems installed in King County
Built for Pacific Northwest rainfall and clay-heavy soils
We finish the job with clean grading and no mess
Where We Work
Drywell Installers Serving All of King County WA
Seattle
Burien
RENTON
KENT
DES MOINES
SHORELINE
TUKWILA
Bellevue
Federal Way
& surrounding areas
REVIEWS
What Clients Say
Danielle M., Kent, WA
They buried two drywells to handle water from our whole roof — haven’t seen a puddle since. Works great!
Mark F., Shoreline, WA
Straightforward, on time, cleaned up after. Best contractor we’ve hired.
FAQs
Drywell Installation FAQs
How deep is a drywell?
Most residential drywells are installed 3–6 feet deep, depending on water volume and soil drainage.
Do drywells require maintenance?
Occasional inspection is recommended, especially if tied into gutters. We offer cleanout options for easier access.
Will I need a permit?
In some cities or larger installs, yes — and we’ll handle that as part of the project.
Ready to Fix Your Drainage the Right Way?
Let’s inspect your yard and install a system that manages water below the surface — where it belongs.