Applications, forms, and fees
Wastewater applications
Application for Final Subdivision (494 KB)
Application for Health Department Approval of Building Permit (347 KB)
Application for Health Department Review of Boundary Line Adjustment or Rezone 460 KB)
Application for Winter Water Table Review (WWTR) (459 KB)
Application to Change Designer of Record (306 KB)
Pre-Application for Review of Subdivision (500 KB)
Repair proposal form for on-site sewage system (OSS) (358 KB)
Site design application form
Online: See instructions on how to submit the On-Site Sewage System (OSS) Site Design application and required and optional checklist.
Submit your application at the online services portal.
Mail:
Site Design Application Form for Individual On-Site Sewage System (OSS) (221 KB)
Wastewater forms
Search and download an as-built Drawing for a property in King County
King County site development process flow chart (113 KB)
Drainfield Easement Form (example only) (62 KB)
Declaration of Covenant: Detached Structure Restriction (396 KB)
Declaration of Covenant: Bedroom Restriction (1.073 KB)
Designer's Pre-Installation Inspection Report/Stub-Out Release (166 KB)
District Waiver Request (19 KB)
Request form of public information needed by OSM to complete inspection report (80 KB)
On-site Sewage System/Sewage Tank Service Report (83 KB)