Register as RainWise Contractor


Please leave this field empty.


Seattle RainWise Training


Contractor Resources

Becoming a RainWise Contractor

If you would like to install rain gardens and cisterns for the RainWise Rebate Program, you must attend one of our free trainings (offered twice a year). Upcoming RainWise training November 6.

RainWise contractors must also be licensed. See Contractor Licensing Requirements [pdf] for more information.

Program Materials

Contractor Newsletter (Archive) – The RainWise program mails its Contractor News and Tips newsletter to RainWise contractors every two months. The purpose of the newsletter is to provide contractors with important program updates and events.

Contractor Overview and FAQ [pdf] – inspection request email and phone number

Rebate Instructions and Forms [pdf] – Updated 8/19/2016. The Rebate Form now includes a space to record customers’ preferred written and spoken languages.

Large Facility Agreement – Over 5,000SF [pdf] – Added 9/22/15. For facilities over 5,000 square feet, the Property Owner is required to sign this 10-year commitment instead of the Homeowner Agreement.

Vendor Payment Option [pdf] for contractors only

Infiltration Test Form [pdf]

Warranty Form for Cisterns and Rain Gardens [pdf]

Notice of RainWise Project [Word Docx] – Only for contractors approved to have their pre-inspection waived. Updated 9/2/16

Before RainWise Construction Begins – Customer Understanding [pdf] – NEW! This form must be completed by the property owner before construction begins. Submit this form with your pre-inspection request or Notice of RainWise Project.

Materials and Suppliers [pdf]

Map of RainWise Basins [pdf, 11×17 inches] – Updated 4/10/17

Maps of rain garden eligibility – Maps of each basin showing which properties are likely eligible for rain gardens.

RainWise Pilot Access Loan – New!

Craft3 provides pre-construction rebate advances to RainWise contractors. This program expands access to the RainWise program by enabling contractors to work with customers who cannot pay upfront for the work. Visit to learn more.

If you choose to participate in this program, please fill out the Rebate Assignment Option form [pdf] with the homeowner.

Guides for Plant Selection

Use these plant suggestions and plans to simplify your design process and share options with customers.

RainWise Planting Plan [pdf] – Updated 9/16/15

SPU Natural Drainage Systems Plant Palette 2000-2006 [pdf]

Seattle Green Factor Plant List [pdf]


Teach your customers how to maintain their cistern and rain gardens. Use our maintenance guide or “how-to” videos. These are all available in English, Spanish and Vietnamese.

Rain Garden and Cistern Maintenance Guide [pdf] (English)

Rain Garden and Cistern Maintenance Guide [pdf] (Spanish)

Rain Garden and Cistern Maintenance Guide [pdf] (Vietnamese)

Design Specifications

Cistern Rebate and Rain Garden Sizing Calculator [Spreadsheet, xlsx] – New! Updated 8/2/2017

Design Details for Rain Gardens and Cisterns [pdf]


GSI Strategies

Learn how easy it is to implement Green Stormwater Infrastructure strategies and methods as a contractor!

About GSI

Events & Training

Want more information on implementation and training your staff? Find local events near you for upcoming training sessions!


GSI Around You

The Seattle region has implemented dozens of GSI projects. See where projects have been installed.

GSI Around You