Underground Utilities

Comprehensive Underground Solutions for Modern Utilities.

When it comes to underground utility installation, the margin for error is zero. A misaligned sewer lateral, an improperly bedded water main, or a storm drainage system that doesn't perform under a Pacific Northwest rain event can mean costly repairs, failed inspections, and project shutdowns that ripple through your entire construction schedule. OSG Dozing has been installing underground utilities in the South Puget Sound region for over 30 years — and we've built our reputation on doing it correctly the first time. 

We install the full spectrum of underground utility systems for commercial developments, public infrastructure projects, tribal facility construction, and private industrial sites throughout Thurston, Mason, Lewis, and Pierce Counties. Storm drainage systems, sanitary sewer mains and laterals, domestic water distribution, fire suppression underground infrastructure, drainage galleries, and infiltration systems — our crews are experienced across all of it, and we self-perform every phase. There's no utility subcontractor. No handoff. No communication gap between your earthwork team and your pipe crew. OSG owns the scope from trench opening to final surface restoration, and that single-source accountability directly protects your timeline and your budget. 

Our crews are trained and certified to OSHA excavation and shoring standards, and every underground utility project begins with confirmed utility locates, a formal excavation safety plan, and equipment readiness verification. For projects in sensitive areas — near existing infrastructure, on constrained urban sites, or within active traffic corridors — we bring the planning discipline and field experience to execute without incident. We've worked alongside municipal inspectors, tribal oversight teams, and state agency representatives on projects with rigorous documentation and compliance requirements. We know what it takes to pass inspection on the first call.

One of the things that sets OSG apart in the underground utility space is our ability to integrate utility installation seamlessly with the rest of the site development scope. Because we self-perform both earthwork and utilities, we control the sequencing between these scopes in a way that a specialty pipe contractor working under a separate GC simply cannot. The result is faster installation timelines, fewer conflicts in the field, and a significantly reduced risk of schedule-busting delays caused by inter-contractor coordination failures. 

Projects like the XXX — which involved the installation of complex drainage gallery systems, storm drainage, sewer, and water infrastructure as part of a commercial development — demonstrate what OSG can execute in a high-stakes commercial utility environment.