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
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
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 forconsistency.
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 until January 1, 2021, or later if the Board determines a later date would be beneficial. The scope of work includes:
Task 1—SDM Update: The Herrera team will update the content and hyperlinks in the Kitsap County Stormwater Design Manual (SDM) for consistency with the 2019 Stormwater Management Manual for Western Washington (SWMMWW). The Herrera team will review the existing SDM and the 2019 SWMMWW and prepare a matrix identifying recommendations for manual updates to ensure consistency with the SWMMWW; if any changes are warranted for Kitsap County Code Title 12 Stormwater Drainage, those will be identified as well. Herrera will work with a Core Manual Team made of representatives from the Kitsap County Department of Community Development, Public Works, and a representative of the Kitsap Building Association, Bernie Kenworthy, PE.
Task 2—Online SDM: For Task 2, the Herrera team will develop an online version of the 2019 SDM using MadCap Flare software. The MadCap Flare is the searchable format the Department of Ecology developed for the SWMMWW.
Task 3—SDM Training: Herrera and RKI will develop training materials and facilitate trainings on the 2019 SDM for internal County staff and interested external stakeholders after the SDM has been adopted (in 2021).
Kitsap County Stormwater Design Manual(effective December 31, 2016)
Kitsap County Stormwater Plans
Water Policy Update Resolution (Resolution 134-2016, August 8, 2016)
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
360) 337-5777 (Kitsap 1)
614 Division Street - MS36Port Orchard, WA 98366
619 Division StreetPort Orchard, Washington
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Kitsap County Stormwater Plans
Washington State Executive Summary of the 2019 Revisions
Department of Ecology Stormwater manuals
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