Septic Professionals List

Cowlitz County licenses three types of septic (OSS) professionals: installers, operation and maintenance providers, and septic tank pumpers. we also keep a list of septic design professionals that regularly do work in our County.

Click on the link to go to the list:

OSS Installer list

OSS Designer Professional list

OSS Operation and Maintenance Provider list

OSS Pumper List

Interested in becoming a licensed septic professional with Cowlitz County?
View our Certification Requirements!