The 2014 Permit and Stormwater Manual Modification public comment period has CLOSED. Ecology is reviewing comments; see the modification page for the estimated completion date.
The 2012 Western Washington manual consists of five volumes. You can download the manual in its entirety or volume by volume, through the link below.
You may order a printed copy or the SWMMWW on CD (for a nominal cost) at the following Internet address:
If you have questions about ordering the 2012 Stormwater Manual, please call the Department of Printing at (360) 570-5555.
To help readers understand the guidance in the 2012 SWMMWW, Ecology has created several additional handouts:
Flow chart for determining Low Impact Development Requirements per Minimum Requirement #5 - The flow chart provides a step-by-step process for determining requirements related to Minimum Requirement #5. List #1 and List #2 under Minimum Requirement #5 are now included on the back of this handout.
Western Washington LID Operations & Maintenance (O&M) Guidance Document - This document provides guidance on procedures, equipment and materials,
skills, and staffing for LID facility maintenance as well as administrative
tools and guidance for implementing LID O&M programs.
Note: In the 2012 SWMMWW, Volume V, Section 4.6, Ecology refers to grant funding to develop detailed maintenance standards for Bioretention Facilities and Permeable Pavement. This guidance document was created as a result of that grant funding. Ecology recommends that Western Washington Municipal Stormwater Permittees use this LID O&M Guidance Document when adopting maintenance standards for their LID BMPs/facilities.
Focus on Bioretention Monitoring - Ecology has begun reviewing local, preliminary bioretention monitoring data. This focus sheet discusses Ecology's short term and long term strategies for reviewing this data to determine if an addendum to Ecology's bioretention guidance is necessary.
Back-to-Back Handout of Table 4.1.1 and Table 4.2.1 from Volume II - These tables show the relationships between Source Control Best Management Practices (BMPs) and Runoff Conveyance/Treatment BMPs to the Construction Stormwater Pollution Prevention Plan (SWPPP) Elements.
Focus on the 2012 Stormwater Management Manual for Western Washington - This focus sheet provides a general overview of the changes in the 2012 SWMMWW.
Spreadsheet of Changes to the SWMMWW - This spreadsheet contains a listing of the locations, changes, and reasons for the changes in each volume, chapter, section or BMP in the final 2012 SWMMWW.
The Stormwater Management Manual for Western Washington is a guidance document. By itself it is not a legally enforceable document. However, several of the NPDES Stormwater General Permits do require the use of the Manual. The changes to the SWMMWW apply to western Washington NPDES permittees listed in the table below. The table also shows when Ecology expects these changes to take effect for each permit.
|Western Washington permittees covered under the following permits will be affected:||
When the 2012 SWMMWW takes effect for each permit:
|Municipal Stormwater Permits||According to proposed implementation schedules of each permit.|
|Possibly, upon reissuance of the ISGP (current permit expires January 1, 2015).|
|Construction Stormwater General Permit (CSWGP)||Possibly, upon reissuance of the CSWGP (current permit expires December 31, 2015).|
|Sand and Gravel General Permit||Possibly, upon reissuance of the Sand and Gravel General Permit (current permit expires October 1, 2015).|
|Boatyard General Permit||Possibly, upon reissuance of the Boatyard General Permit (current permit expires May 31, 2016).|
Western Washington municipalities not covered under a general stormwater permit often use the SWMMWW. Check with your city or county to find out if they use the SWMMWW and for adoption dates.
The following files show the changes between the 2005 SWMMWW and the final 2012 SWMMWW.
Comparison between 2012 SWMMWW and 2005 SWMMWW
On November 4, 2011, Ecology began a 90-day public comment period for the Draft 2012 Stormwater Management Manual for Western Washington (SWMMWW). For more information, to view the public comments that Ecology received on the Draft 2012 SWMMWW, and to see Ecology’s Response to Comments on the Draft 2012 SWMMWW please visit the draft stormwater management manual webpage. Ecology used the public comments and suggestions to improve the manual and to issue the final 2012 Stormwater Management Manual for Western Washington.
Check out our Ecology Contacts for Technical Questions webpage. You may be interested in participating in our upcoming (February through June, 2013) trainings. Details about the upcoming trainings will be posted on http://www.ecy.wa.gov/programs/wq/stormwater/municipal/EcyWorkshops.html.
You can also contact the SWMMWW coordinator, Amanda Heye, directly at 360-407-6457.
Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.html.