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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

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Stormwater Management Manual (SWMM)

2014 SWMM coverThe Stormwater Management Manual (SWMM) provides policy and design requirements for stormwater management throughout the City of Portland. The requirements in the manual apply to all development, redevelopment, and improvement projects within the City of Portland on private and public property and in the public right-of-way. Environmental Services completed revising the Stormwater Management Manual in 2013 to meet current regulatory requirements and recently adopted policies.

The City of Portland adopted the revised SWMM on January 2, 2014. As of April 2, 2014, project designers must use the 2014 SWMM.

Environmental Services is accepting comments on the proposed 2016 SWMM through May 6, 2016.  Please see the public comment website for more information.

You can use the links on this page to access the manual or pick up a free compact disc version of the 2014 SWMM at the Development Services Center,1900 SW 4th Avenue in Portland. To get a free CD by mail, please call 503-823-7103.