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King County Site Management Plan

The King County Site Management Plan (SiMPla) is a manual for King County workers. It lists stormwater pollution-preventing best management practices (BMPs) to follow while working 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 Municipal Stormwater National Pollutant Discharge Elimination System (NPDES) Permit.

Download here:

2021 King County Site Management Plan (2.2 MB)

Document sections:

The SiMPla is divided into the following BMP sections:

  • County Building 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 Document

Check out these sections in the 2021 SiMPla:

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