Septic System Installation in Lewis & Cowlitz County, WA | Rockridge — Rockridge General Engineering & Excavation #1 Site preparation contractor in Lewis & Cowlitz County, WA

intro

Whether you're building on raw land or replacing a failed system, Rockridge installs septic systems that pass inspection and last the test of time. We work from your approved design and follow local health department requirements on every job.

We're based in Toledo and install systems throughout Lewis and Cowlitz counties, from Chehalis and Centralia to Winlock, Vader, Onalaska Castle Rock, Kelso and Longview.

What’s included

Excavation for tanks and drainfields
Septic and pump tank placement
Distribution boxes, piping and pressure distribution systems
Drainfield trenches, beds and mound systems
Replacement of failed or undersized systems
Final grading and site cleanup

Our process

Site visit: we look at the property, access and your design or soil report.
Estimate: a clear written price for the full installation.
Scheduling and permits: we coordinate install dates and inspections.
Installation: excavation, tank placement, piping and drainfield.
Inspection and cover: we meet the inspector, then backfill and grade.

WHY Rockridge

Licensed and bonded Washington contractor (WA LIC # ROCKRGE816DF)
Local crew that knows Southwest Washington soils and wet winters
Clean sites, clear communication and on-time inspections
One contractor for clearing, driveway and septic on new builds

septic installation FAQ

Do I need a septic design before you can install? Yes. In Washington, a septic system must be designed by a licensed designer or engineer and approved by the county before installation. If you don't have one yet, we can point you to designers we work with.

How long does a septic installation take? Most residential installs take 3 to 5 working days once permits are approved. Weather, soil conditions and system type & size can change that.

What affects the cost of a septic system? The system type (gravity, pressure or mound), soil conditions, tank size, distance from the house and site access all affect price. We give a written estimate after seeing your site and design.

Can you replace a failed drainfield? Yes. We excavate and remove the failed field, install the new system per the approved repair design, and restore the area.

Can you also clear the lot and build the driveway? Yes. Many customers have us handle clearing, driveway, building pad, utilities and septic together, which saves time and coordination.