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:

Erosion control best practices

BMPs for erosion control (2.2 MB)

Best management practices for maintenance and operations of municipal separate storm sewer

BMPs for municipal separate storm sewer (MS4) (2.2 MB)

Integrated Pest Management

Integrated Pest Management (2.2 MB)

Best management practices for building exterior and grounds operations and maintenance

BMPs for County buildings and properties (2.2 MB)

Related Topics

Stormwater services

Resources and technical guidance to help manage stormwater.

Pollution prevention

Stormwater pollution prevention resources and information.

SWDM

Surface Water Design Manual (SWDM) information.

Watersheds, rivers, streams & lakes

Info on watersheds, rivers and streams including news, reports, data, activities and grants.

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