List of Certified Professionals

Current list of county certified Septic Designers/Engineers. Any septic designer or Professional Engineer (P.E.) licensed in the State of Washington may design onsite sewage systems in Lewis County. This list contains the names of those professionals who have indicated they would like to be listed on the Lewis County web page.

Current list of county certified Septic Installers. Interested in becoming a county certified Septic Installer, please find the application here.

Current list of county certified Septic Pumpers. Interested in becoming a county certified Septic Pumper, please find the application here.

To verify if your designer, engineer, or septic system installer is licensed to practice in Washington state, follow the appropriate link below.

Look up a Designer or Professional Engineer - WA State Department of Licensing
Look up a Contractor - WA State Labor and Industries

For more information on becoming a New Certified Septic Installer, Pumper, or Designer, please contact our office 360-740-2718 or visit us at 2025 NE Kresky Ave Chehalis, WA 98532.