Rain gardens and stormwater projects · Washington
Stewardship Partners GSI Mini Grants (12,000 Rain Gardens)
Run by Stewardship Partners / King County WTD Waterworks Grant (12,000 Rain Gardens)
- What you get
- Up to $1,500 typical (page: up to total project cost, varies by benefits); up to $4,500 for income-limited landowners per King County
- Maximum
- $1,500 per household
- Who qualifies
- Landowners in the King County WTD service area not eligible for other incentive programs; larger awards for income-limited owners.
- Where
- Landowners in the King County Wastewater Treatment Division service area outside Seattle RainWise basins.
- Status
- Status not posted. The official page doesn't say whether it's taking applications.
- Type of payment
- Grant
What you do
Build a rain garden, depave project, cistern or green roof on your property; paid after completion.
Requirements
- Rain barrels not eligible
- Cisterns must meet gallons-of-storage to contributing-area ratio in the application
- Proof of ownership
- Income documentation if applying as income-limited
- Budget, site sketch and expense receipts
- Register project at soundimpacts.org with sketch and photo as proof of installation
The plan or design it asks for
Site sketch and budget with application, one project worksheet per project.
Make the plan in Sow
Draw the layout and build the plant list
Sow places plants on a photo of your yard and keeps a list of everything you add. Check Stewardship Partners's rules for exactly what to submit.
How to apply
- 1Optional pre-application holds funds and place in line for up to 3 months
- 2Submit application with documents
- 3Complete the project
- 4Register on soundimpacts.org and submit proof of installation
- 5Payment issued after completion
Timing and deadlines
not published
Sources
- https://12000raingardens.org/gsi-mini-grants (official page)
- https://kingcounty.gov/en/dept/dnrp/nature-recreation/environment-ecology-conservation/yard-garden/rain-gardens-barrels-cisterns/green-stormwater-incentive-program/eligibility
Last checked October 17, 2026. See something out of date? Tell us.
Sow is not affiliated with any of these agencies or utilities. Amounts and rules change, often at the start of a fiscal year, so confirm the details on the official page before you start a project. How we research these programs
More programs near the same area
- SeasonalPlan required
City of Shoreline Soak It Up Rebate for Rain Gardens and Native Landscapes
City of Shoreline Surface Water Utility
Up to $5,600 for homeowners (based on project size); up to $14,000 for schools, businesses, faith-based and other large properties
Up to $5,600 per household
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City of Kirkland Yard Smart Rain Rewards
City of Kirkland Surface Water Utility
Single-family: 75% of contractor costs or 100% of DIY costs, up to $5,000; standard projects $7.50 per sq ft of impervious surface managed
Up to $5,000 per household
- Waitlist
King County RainScapes Green Stormwater Pilot
King County Stormwater Services Section
County covers construction costs during pilot plus first year of maintenance
- OpenPlan required
RainWise Rain Garden and Cistern Rebate
Seattle Public Utilities and King County
Up to $13.12 per sq ft of roof area for rain gardens; up to $9.91 per sq ft of roof area for cisterns; rebates cover 90-100% of installation cost
- OpenPlan required
Cascade Water Alliance Lawn Be Gone Grass Removal Rebate
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$1 per sq ft of grass removed, up to $500 for single-family homes
Up to $500 per household
- Seasonal
Saving Water Partnership Sprinkler Timer Replacement Rebate
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$10 per functioning zone, up to $100
Up to $100 per household