Commercial Stormwater & Erosion Control in King County WA
From site prep to final inspection, Sandbagger Northwest keeps your job site compliant, protected, and moving forward.
We work with general contractors, developers, and municipalities across King County to install stormwater and erosion systems that meet specs, pass inspection, and protect the land.
What We Fix
Site Solutions for Contractors, Developers & Public Works
We provide commercial drainage and erosion control for:
General contractors and builders
Civil construction firms
Developers and architects
HOAs and property managers
Public agencies and municipalities
Our Commercial Services
Commercial Services
Built to Spec. Built to Last. Built To Pass Inspection.
We’re certified, insured, and experienced in the field — and we know how to deliver drainage and erosion systems that meet local, state, and federal requirements.
Underground Storm Drainage Systems
We design and install large-scale underground systems to control stormwater on streets, lots, and commercial properties.
Catch Basins & Drain Inlets
Collect runoff and trap sediment to protect downstream systems and improve water quality.
Erosion Control Services
From slope stabilization to hydroseeding, we protect exposed soil and reduce runoff on active job sites.
Stormwater Pollution Prevention Plans (SWPPP)
We prepare and implement site-specific SWPPP strategies that satisfy King County, DOE, and EPA guidelines.
Best Management Practices (BMP) Installation & Maintenance
Check dams, filter berms, straw wattles, silt fences — installed and maintained to code.CTA Button: Learn More
Retention Ponds, Swales & Culverts
We build permanent and temporary solutions to move, filter, and store runoff on large commercial sites.
Certified to Work. Trusted to Deliver.
Washington State Certified Erosion & Sediment Control Lead
Seattle RainWise Certified Contractor
Woman-Owned Business
Licensed, bonded, and insured
Trusted by contractors across King County
REVIEWS
What Our Partners Say
Site Superintendent, Seattle, WA
They handled SWPPP and BMPs for our entire site — clean, professional, and 100% compliant.
Project Manager, Renton, WA
The best erosion control crew we’ve worked with. No re-dos, passed inspection the first time.
Service Area
Commercial Drainage & Erosion Services in King County WA
We proudly provide residential drainage services throughout:
Seattle
RENTON
KENT
SHORELINE
TUKWILA
Federal Way
Burien
Bellevue
Des Moines and beyond
FAQs
Commercial Drainage FAQs
Do you handle permitting?
Yes. We’re familiar with King County and local municipality permit requirements for drainage and erosion work.
Can you work around active construction?
Absolutely. We’re used to busy sites and coordinate with your team to avoid delays or rework.
Do you offer ongoing maintenance services?
Yes — we provide BMP maintenance, erosion control touch-ups, and emergency response if needed.
Let’s Talk About Your Project
From site planning to final grade, we’re here to keep your project on track and on code.