Rainwise is designed to reduce runoff that overwhelms combined sewers across Seattle and parts of King County. Homeowners in eligible basins receive a rebate that covers cisterns, gutters, and infiltration solutions. Our services overview highlights how we align every install with rebate requirements.
Eligibility zones and timing
Start by confirming your property is within a qualifying basin using the official Rainwise map. Once eligibility is confirmed, expect a 4–8 week timeline that includes design, approvals, installation, and inspection. We coordinate Rainwise paperwork alongside compliance audits so there are no surprises at final review.
Rebate amounts in 2025
Rebate funding is calculated using roof area and impervious surfaces directed into the new system. Typical Seattle homes qualify for $2,000–$4,000, while large roofs or multi-unit buildings can access higher totals. Pairing cistern storage with gutter upgrades ensures the entire runoff path meets Rainwise and city code.
Osprey Exterior’s process
- Inspection & scope: We review downspouts, grading, and existing drainage during a free assessment.
- Design & application: Our team prepares Rainwise design files, captures photos, and submits the application for approval.
- Installation & paperwork: Certified installers complete the work, document progress, and submit the rebate packet within 24 hours of inspection.
Estimate your potential rebate
Select the options that match your home to see how we calculate funding tiers during consultations.
Throughout the project we log milestones in our project tracker so every rebate step stays on schedule.
Next steps
Ready to capture your rebate? Request a site visit using the form below or compare options on our cistern systems page. For homeowners outside the core basin, review our city landing pages for localized guidance.
