Find sewage/septic information for homeowners and residents.
Professionals need Certificates of Competency to work on and maintain septic systems. Learn more about becoming certified or renewing your certification.
Find sewage/septic information pertaining to real estate.
The online database has King County's official records. You can also find the record drawing search utility, King County iMap, and other resources.
Sewage/septic system owners need to have their system inspected regularly. Learn more about proper sewage/septic system care.
Learn more about loans or grants for on-site sewage systems.
Find information for buyers and sellers of properties with on-site sewage/septic systems. Buyers and sellers both have responsibilities during a sale.
You must have a permit to install, repair, or replace an on-site sewage/septic system. Find more information about permits and applications.
The On-site Sewage/Septic System (OSS) Technical Advisory Committee brings together industry partners and impacted parties to participate in OSS policy development and problem resolution.