RainWise Contractor in Seattle
Rain Gardens and Cisterns

RainWise is a Seattle Public Utilities initiative that helps homeowners reduce stormwater runoff from their rooftops. When heavy rain overwhelms the combined sewer system, it can overflow into Puget Sound and local waterways.

The program offers rebates to homeowners in eligible neighborhoods who install qualifying rain gardens or cisterns. As a certified RainWise contractor, Trillium manages the project from eligibility check through rebate application. You don’t have to navigate the city process alone.

A rain garden is a shallow, planted depression designed to capture and absorb rainwater from your roof, driveway, or paved surfaces. Instead of running off into the street or sewer, water soaks slowly into the ground.

We design rain gardens that are both functional and beautiful. Each one is planted with native, drought-tolerant species that thrive in wet and dry conditions alike. A well-designed rain garden fits naturally into your existing landscape and becomes lower maintenance as the plants establish.

A cistern captures rainwater directly from your downspouts and stores it for later use, typically for landscape irrigation. This keeps water out of the sewer system during heavy rain and gives you a resource for watering during Seattle’s dry summer months.

Cisterns can be installed above or below grade depending on your property’s layout and drainage needs. We size and position the system to fit your site and irrigation goals.