We Emphasize Quality, Not Just Industry Standards


Active Underground has been a full service contractor since 2005 serving Shelton, WA, Mason County and surrounding areas. We have a septic and excavation business that we specialize in residential site prep, septic system designs and installation.

When you first meet us, you will appreciate our “No Pressure” staff. We will explain your construction options in a clear manner and then let you decide. As you learn more about us, you will begin to realize the personal touch and attention to details in the service we provide.

We handle every job, big or small, with integrity, attention and care!

Call Us Today!
(360) 426-9277