Septic Professionals

Cowlitz County licenses three types of septic (OSS) professionals: installers, operation and maintenance providers, and septic tank pumpers.

Click on the link to go to the list:

• Licensed Septic Installers
• Licensed Septic Operation and Maintenance (O&M) Providers
• Licensed Septic Tank Pumpers

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