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King County Washington home

Resources for On-Site Sewage/Septic system professionals

Permitting resources

Search septic system as-built drawing records

Online database with King County's official records.

Sewage/septic health codes

Find information related to health codes from King County and Washington State Boards of Health.

Memorandums to sewage/septic professionals

See memos for the septic industry.

Septic program fees

See fees for septic program services

On-site sewage design application, process flow, and directions

Learn how a licensed on-site sewage system designer can submit a design application online.

Applications and forms

Find wastewater applications and forms for the septic industry.

New on-site sewage design and installation

Learn about the permitting process for new on-site sewage systems.

Public Health Permit Center

Learn how to navigate the permitting system.

Certification resources

Professional on-site sewage/septic system certifications

Find information about certifications related to on-site sewage/septic systems.

Contacts and engagement

Subscribe for on-site sewage industry email updates

Subscribe to receive periodic emails from Public Health’s On-site Sewage/ Septic Program.

On-site Sewage System Technical Advisory Committee

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.