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Local jurisdictions may also choose to have more stringent requirements. You should talk with your municipal building permits or development services
department about your project to find out the exact requirements that apply to your project.

The SWMMWW can be downloaded here: http://www.ecy.wa.gov/programs/wq/stormwater/manual.html

WHEN ARE THE REQUIREMENTS OF THE SWMMWW (OR MUNICIPAL EQUIVALENT) TO BE IMPLEMENTED?

In 2012, Ecology reissued the SWMMWW. Western Washington municipalities have different deadlines for adopting the 2012 SWMMWW or equivalent:

• June 30, 2015 for Phase I cities and counties
• December 31, 2016 or by their Growth Management Act Comprehensive Plan timeline, whichever is later for Phase II cities and counties

Cities and Counties may choose to adopt earlier, with a few already adopting the SWMMWW prior to the publication of the Rain Garden Handbook.

This appendix focuses on the Washington State Department of Ecology’s SWMMWW only. Local Jurisdictions may prepare their own guidance. Check
with your local city or County to ensure that you are using the proper guidance.

Six Important Questions about Rain Gardens and the

2012 SWMMWW Minimum Requirements

These questions provide an introductory guide of where to look for more details.

1. WHAT ARE THE MINIMUM REQUIREMENTS IN THE 2012 SWMMWW?
Within the 2012 SWMMWW there are nine minimum requirements:

1. Preparation of Stormwater Site Plan 6. Runoff Treatment
2. Construction Stormwater Pollution Prevention (SWPPP) 7. Flow Control
3. Source Control of Pollution 8. Wetlands Protection
4. Preservation of Natural Drainage Systems and Outfalls 9. Operation and Maintenance
5. On-site Stormwater Management
Rain Gardens can be used to help satisfy Minimum Requirement #5 when only Minimum Requirements #1 through #5 apply.