Rainwater Directory
Rainwater Installer Directory 2 Specialists Listed

Rainwater Harvesting Installers in Seattle, Washington

Leading rainwater harvesting installers in Seattle, Washington.

Rainwater planning estimate

Collection potential and storage target

Estimate annual roof collection separately from the storage needed to cover your chosen daily demand and reserve period.

Collection formula: roof area × annual rainfall × 0.6233 × runoff efficiency. Storage target: daily demand × reserve days. This screening estimate does not model monthly droughts, tank overflow, local roof geometry, water quality, permits, or structural requirements. Rainfall source: NOAA National Centers for Environmental Information, U.S. Monthly Climate Normals, 1971-2000; verified 2026-09-14.

Featured Installers in Seattle

Provider details are shown with their evidence status. Verify licensing, insurance, and scope directly before hiring.

RainBank Rainwater Systems

2024 NW 58th St, Seattle, WA 98107

Source review pending
Credentials reported by provider:

ARCSA AP Certified, ASSE 21110 Certified, Washington Dept of Health Compliant Designer

Independent source verification pending.

Core Services

Whole-home potable rainwater systems Seattle Public Utilities RainWise certified installations Underground cisterns UV disinfection systems Rainwater system maintenance & inspections

Service Area: Seattle, King County, Puget Sound, San Juan Islands, Western Washington

Call (360) 376-5930 Visit Website
Need guidance? Read our 10-question contractor vetting checklist →
E-E-A-T Hiring Advice

4 Essential Questions to Ask Before Hiring a Rainwater Installer

Rainwater harvesting involves structural engineering, filtration, and plumbing compliance. Before signing an installation contract, ensure your contractor addresses these key items:

  • Professional Credentials: Are they ARCSA Accredited Professionals (AP) or licensed plumbers certified in backflow prevention?
  • Pre-Filtration Sizing: What micron rating and first-flush diversion volume are they designing to prevent gutter sludge from reaching storage?
  • Tank Specifications: Are storage containers opaque, UV-stabilized, and certified to NSF/ANSI 61 if utilized for indoor or potable use?
  • Permits & Rebates: Will the contractor pull required municipal plumbing permits and submit utility rebate paperwork on your behalf?
Read our complete 10-question installer hiring guide & cost breakdown →