Current Kitsap County Stormwater Manual effective December 31, 2016
Updating Kitsap County's stormwater management Ordinance, Title 12 KCC, "Stormwater Drainage" and adopting a new Kitsap County Stormwater Design Manual effective October 4, 2021.
In 2019, Ecology revised its stormwater design manual for
Western Washington communities. As such, Kitsap County is mandated to update
it’s Stormwater Design Manual and relevant development codes for consistency.
Kitsap County Departments of Public Works and Community Development have
collaboratively embarked on a review and update process, with the assistance of a
Scope of Work
In April 2019, Herrera Environmental Consultants (Herrera) was contracted by Kitsap County to update the Kitsap County Stormwater Design Manual (SDM), develop an online version of the SDM, conduct focused review of the Kitsap County Code (KCC), and assist with any necessary revisions to the KCC. The revised manual and any code changes will not be effective untilJanuary 1, 2021, or later if the Board determines a later date would be beneficial.
Executive Summary of the 2019 Revisions
Western Washington Phase II Municipal Stormwater Permit
Department of Ecology Stormwater manuals2019 Manual executive summary of changesFact Sheet for the NPDES
Crosswalk: 2014 - 2019 SWMMWW
As part of the United States Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permit program, Kitsap County is required to develop and implement a stormwater management program. This program is intended to reduce discharge of pollutants to the maximum extent practicable and protect water quality. The Washington State Department of Ecology is the responsible agency for permit issuance to local jurisdictions.
Kitsap County is considered a Phase II NPDES permit jurisdiction and is located within census-defined urbanized areas and includes Urban Growth Areas defined by the Washington State Growth Management Act. As a Phase II jurisdiction, stormwater runoff and associated codes must comply with Ecology's rules to prevent and control the impacts of stormwater runoff from new development, redevelopment and construction activities.
Kitsap County's Title 12 and Stormwater Design Manual provides guidance and standards in stormwater management planning and design for development.
Additionally, in 2009, the Kitsap County Board of County Commissioners approved Resolution No 134-2016 "Water as a Resource" policy. This policy, in addition to requirements noted above, provide guiding principles to stormwater asset management, implementing development codes, public outreach and reporting needs.
Kitsap County Stormwater Design Manual (effective December 31, 2016)
Kitsap County Stormwater Plans
Water Policy Update Resolution (Resolution 134-2016, August 8, 2016)
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