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King County Site Management Plan (SiMPla) cover

The 2021 King County Site Management Plan was developed so that King County workers now have one manual of stormwater pollution-preventing best management practices (BMPs) to follow while conducting work activities throughout the county. SiMPla BMPs are not intended to supersede established, approved policies and procedures.

This manual also is intended to comply with Section S5.C.10 of the Phase I NPDES Municipal Stormwater Permit.

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Document sections:

The SiMPla is divided into these following BMP sections by kinds of work tasks:

  • County Buildings and Properties 
  • Municipal Separate Storm Sewer Systems (MS4) 
  • Erosion Control

Additionally, these sections of the SiMPla prevent stormwater pollution:

  • Erosion Control
  • Water Conservation 
  • King County Integrated Pesticide Management (IPM) Document
Best management practices for operations and maintenance in road rights of way
BMPs for operations and maintenance in road ROW
Best management practices for building exterior and grounds operations and maintenance
BMPs for building exterior and grounds operations and maintenance

 

Best management practices for maintenance and operations of municipal separate storm sewer (MS4)
BMPs for maintenance and operations of municipal separate storm sewer (MS4)
Erosion control
Erosion control
Water conservation
Water conservation
Integrated pest management
Integrated pest management

For questions about the King County Site Management Plan, please contact Marilyn Guthrie, King County Stormwater Services Section.