Underground Storm Drainage Systems in King County WA
Engineered solutions for surface runoff and subsurface flow — built to meet code, pass inspection, and protect your site.
We design and install underground storm drainage systems for commercial properties, public works projects, and large-scale developments across King County and the Seattle metro.
Why It Matters
Underground Drainage is the Backbone of Your Site's Water Control
Whether you're building a parking lot, subdivision, warehouse, or city street — your stormwater system must:
Control runoff from impervious surfaces
Prevent flooding or erosion
Protect building foundations and infrastructure
Comply with King County, DOE, and EPA regulations
Our systems do all of the above — with full documentation and expert installation.
What We Build
Storm Drainage Solutions Tailored to Your Site
We install:
Underground pipe networks (PVC, HDPE, and concrete)
Catch basin tie-ins and manholes
Stormwater conveyance and collection systems
Infiltration trenches and galleries
Drywell connections
Outfall structures and daylighting systems
We work closely with engineers, GCs, and project managers to ensure smooth execution.
Design & Compliance
Designed for Durability. Built to Pass Inspection.
Plan interpretation and spec validation
Grade and slope calculations
BMP coordination
System testing and video inspection (if required)
As-built updates and final reporting
Installed to King County and DOE standards
Our systems do all of the above — with full documentation and expert installation.
Equipment & Crew
We Have the Tools and the Team to Get It Done
Excavators, skid steers, and trenchers
Full PPE and safety compliance
Traffic control and street safety (if required)
Experienced crew with commercial jobsite training
Woman-owned, insured, and licensed in Washington
Where We Work
Serving Commercial Sites Across King County WA
We reshape yards and correct slopes across:
Seattle
Burien
RENTON
KENT
SHORELINE
Federal Way
TUKWILA
auburn
DES MOINES
and more
REVIEWS
Contractor Feedback
Civil Contractor, Bellevue WA
They installed over 800 feet of storm pipe under a tight schedule — everything passed inspection first try.
Site Superintendent, Renton WA
Professional crew, fair pricing, no nonsense. One of the best drainage contractors we’ve worked with.
FAQs
Underground Drainage FAQs
Do you work from engineer-stamped plans?
Yes — we regularly install per plan and coordinate with design teams to meet specs and deadlines.
Can you coordinate with paving and utility crews?
Absolutely. We regularly collaborate on phased site work and work around other contractors.
Do you offer maintenance after installation?
Yes, we can provide inspection, cleanout, and repair services for long-term performance.
Let’s Build a Stormwater System That Lasts
Request a bid today and get expert commercial drainage installation — built to code and on schedule.