Stewardship Partners

What Stewardship Partners does

Stewardship Partners is a Seattle-based nonprofit organization founded in 1999 to address ecological decline in the Puget Sound region. It operates a portfolio of interconnected environmental programs that combine urban green stormwater infrastructure with agricultural land stewardship. Core programs include Snoqualmie Stewardship (habitat restoration via the Adopt-a-Buffer corporate partnership model), Salmon-Safe certification for farms and urban sites in western Washington (since 2004), the Adopt-a-Downspout / Box of Rain initiative that installs biofiltration planter boxes under elevated roadway downspouts to filter toxic tire chemicals (6PPD-quinone) from stormwater, the 12,000 Rain Gardens and RainChangers public-awareness campaigns, and the City Habitats cross-sector coalition.

The organization serves a diversified stakeholder base: farmers and agricultural landowners in the Snoqualmie Valley and wider Puget Sound region, corporate partners (Boeing, Microsoft, Starbucks, Tableau, Patagonia, DLR Group, Campbell Global), homeowners participating in rain garden rebate programs, schools (e.g., Carnation Elementary), and municipal/county governments (Seattle Public Utilities, King County, WSDOT). It also convenes the annual Green Infrastructure Summit of the Salish Sea (250+ partners in 2025) and the Feast on the Farm fundraiser.

Its business model is donation- and grant-based, supplemented by corporate sponsorships for Adopt-a-Buffer and Adopt-a-Downspout sites (approximately $10,000 per Adopt-a-Downspout site) and event revenue. The organization is governed by a Board of Directors and operates with a staff of approximately 10, having rebuilt its full field crew in 2024 for the first time since pre-Covid. Notable technical and operational outputs include a 92% 6PPD-quinone filtration rate, restoration of nearly a mile of Snoqualmie River riverbank in 2024, and record volunteer engagement of 1,400+ in 2025.

Name

Stewardship Partners

Legal name

Stewardship Partners

Website

https://stewardshippartners.org

Company type

Private

Founded year

1999

Operating status

Operating

Headcount range

11–50 employees

Short description

Stewardship Partners is a Seattle-based nonprofit, founded in 1999, that engages Puget Sound communities as caretakers of land and water through habitat restoration, Salmon-Safe farm certification, urban stormwater biofiltration (Adopt-a-Downspout), and green infrastructure programs for farmers, corporate sponsors, homeowners, schools, and municipal governments.

Ownership category

akta.pro rank

Product category

Environmental Stewardship and Conservation Services

NAICS

Environment, Conservation and Wildlife Organizations (813312)

SIC

Agricultural Services (700)

akta.pro primary industry

Marine & Freshwater Conservation (BPAGAGAE)

akta.pro secondary industries

Water Resources & Watershed Protection (BPAGAGAK), Oceans, Coastal & Marine Resource Management (BPADALAI), Wetland, Riparian & Buffer Services (within forest landscapes) (AFAMAMAI), Riparian & Watershed Reforestation (Streambank Stabilization) (AFAMACAK)

Keywords

• Environmental restoration services
• Green stormwater infrastructure
• Sustainable agriculture certification
• Riparian habitat restoration
• Watershed stewardship programs

Headquarters

HQ city

Seattle, WA

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Supply Chain, Others

Revenue model

1. Donations and Grants: Individual donations and institutional grants from foundations and government agencies form the primary revenue stream. The organization relies heavily on public funding and philanthropic support.
2. Corporate Sponsorships: Adopt-a-Buffer and Adopt-a-Downspout sponsorships from businesses and corporations. Sponsors fund restoration sites (approximately $10,000 per Adopt-a-Downspout site) or provide ongoing financial support for habitat buffers.
3. Event Revenue: Feast on the Farm annual fundraiser generates significant revenue through ticket sales, sponsorships, live auctions, and raffles. Raised over $120,000 in 2025 and $115,000 in 2024.
4. Summit Sponsorships: Annual Green Infrastructure Summit of the Salish Sea generates revenue through event sponsorships from corporate and organizational partners.

Go-to-market motion3 records

Distribution channels5 records

Marketing channels9 records

Core offering

Stewardship Partners is a nonprofit that delivers people-based environmental stewardship programs across the Puget Sound region. It restores riparian habitat through the Snoqualmie Stewardship Program and Adopt-a-Buffer corporate partnerships, certifies farms and urban sites under Salmon-Safe Puget Sound, installs and maintains stormwater biofiltration Boxes of Rain through Adopt-a-Downspout, and runs residential rain garden campaigns (12,000 Rain Gardens, RainChangers). Revenue and engagement are generated through corporate sponsorships, donations, grants, and annual events including Feast on the Farm and the Green Infrastructure Summit of the Salish Sea.

Product overview

Stewardship Partners is a nonprofit organization (not a technology company) that creates people-based environmental solutions engaging Puget Sound communities as caretakers of land and water. The organization operates a portfolio of interconnected environmental programs rather than a unified software product. Core programs include: the Snoqualmie Stewardship Program (habitat restoration via Adopt-a-Buffer corporate partnerships), Salmon-Safe certification for farms and urban sites, Adopt-a-Downspout/Box of Rain (stormwater biofiltration boxes), Green Infrastructure Programs (including 12,000 Rain Gardens, RainChangers campaign, and City Habitats), and the annual Green Infrastructure Summit of the Salish Sea. Additionally, Feast on the Farm is the organization's signature annual fundraising event. These programs work together to filter polluted stormwater, restore salmon and wildlife habitat, support sustainable farming, and engage communities in environmental stewardship.

Differentiator

Problem solved

Functional benefit

Brands

• Adopt-a-Buffer: Program connecting businesses and community groups to restore fish and wildlife habitat on agricultural properties in the Snoqualmie Valley
• Adopt-a-Downspout
• Feast on the Farm
• Green Infrastructure Summit of the Salish Sea
• 12,000 Rain Gardens
• Salmon-Safe Puget Sound
• Snoqualmie Stewardship
• RainChangers

Quantifiable outcome

• 92% of 6PPD-quinone filtered from polluted stormwater by Boxes of Rain
• +6 more outcomes

Named customers11 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

25 partnerships are on record, tiered core and minor.

• Washington State Department of Transportation (WSDOT)coreStrategic or Co-development Partner10-year partnership agreement with WSDOT to scale the installation and maintenance of biofilter boxes (Adopt-a-Downspout) across the region. WSDOT is a key partner in addressing highway runoff pollution.
• The Nature ConservancycoreStrategic or Co-development PartnerLong-standing partner in green infrastructure initiatives, stormwater management, and City Habitats campaign. Collaborates on Adopt-a-Downspout program addressing toxic tire chemicals.
• HerreracoreStrategic or Co-development PartnerEnvironmental consulting firm partner in Adopt-a-Downspout program, providing technical expertise for stormwater management projects.
• King CountycoreStrategic or Co-development PartnerMajor funder through King County Flood Control District Flood Reduction Funds for rain garden installations and Adopt-a-Downspout sites.
• Boeing CompanycoreGTM or Marketing PartnerMajor corporate sponsor and supporter; significant investments in City Habitats campaign; Kraken Green Night presenting partner; Boeing Company has supported Adopt-a-Buffer and employee volunteer programs.
• MicrosoftcoreGTM or Marketing PartnerCorporate Adopt-a-Buffer partner participating in employee volunteer restoration events at Snoqualmie Valley farms.
• Campbell GlobalminorGTM or Marketing PartnerPortland-based sustainable timber company and largest landowner in Snoqualmie Valley (100,000 acre Snoqualmie Forest); Adopt-a-Buffer sponsor at Full Circle Farm.
• Aspect ConsultingcoreImplementation/ SI/ Consulting PartnerEngineering firm providing pro-bono design, project management, and construction expertise for rain garden projects including Carnation Elementary School.
• Tableau (Salesforce)minorGTM or Marketing PartnerCorporate volunteer partner connected through Adopt-a-Buffer program; volunteers at Carnation Farms restoring fish and wildlife habitat.
• StarbuckscoreGTM or Marketing PartnerPartners for Sustainability program supporter; corporate partner in environmental initiatives.
• Duke's Seafood & Chowder HouseminorGTM or Marketing PartnerLong-time partner hosting annual Sustainability Month with donations to Stewardship Partners; Adopt-a-Buffer volunteer events.
• Salmon-SafecoreStrategic or Co-development PartnerPartnership with Portland-based Salmon-Safe headquarters for co-implementation of Salmon-Safe certification in western Washington since 2004; Stewardship Partners leads agricultural and golf certifications.
• Snoqualmie TribecoreStrategic or Co-development PartnerLong-standing partnership with Tribe's Environmental and Natural Resources program for habitat restoration, educational events, and water quality monitoring along Snoqualmie River.
• Greenprint PartnersminorStrategic or Co-development PartnerPartnership for Adopt-a-Downspout webinar on 6PPD-q toxic chemical and salmon protection initiatives.
• Carnation FarmscoreStrategic or Co-development PartnerKey farm partner hosting restoration crew headquarters; site of rain gardens and Earth Day volunteer events; partner since 2013 with over a decade of restoration work.
• Griffin Creek FarmcoreStrategic or Co-development PartnerSalmon-Safe certified farm founded in 1996; original home of Feast on the Farm for 17 years; site of major restoration work since 2004 along Snoqualmie River.
• Growing VeteransminorStrategic or Co-development PartnerVeterans organization committed to Salmon-Safe certification; uses sustainable agriculture for veteran reintegration.
• City Habitats NetworkcoreStrategic or Co-development PartnerPuget Sound-wide campaign started by Stewardship Partners with The Nature Conservancy, Washington Environmental Council, and City of Seattle; 100+ partners across sectors.
• Seattle Public UtilitiescoreStrategic or Co-development PartnerPartner in RainWise program and StormFest; General Manager and CEO Andrew Lee spoke at 2026 Green Infrastructure Summit.
• Northwest Fly AnglersminorGTM or Marketing PartnerConducts regular maintenance on Boxes of Rain at adopted site through Adopt-a-Downspout initiative.
• Touch WorldwideminorGTM or Marketing PartnerEvent sponsor and partner for Green Infrastructure Summit branding and event needs.
• PatagoniaminorGTM or Marketing PartnerLong-time corporate supporter and partner in sustainability initiatives.
• Grow It Forward RestorationminorStrategic or Co-development PartnerNew local nonprofit partner offering volunteer opportunities for native tree seedling delivery to restoration projects.
• Dirt CorpsminorImplementation/ SI/ Consulting PartnerEnvironmental contractor for biofiltration box installation at The Grange in Duvall.
• MxM Landscape ArchitectureminorImplementation/ SI/ Consulting PartnerDesign partner for rain garden and biofiltration box projects including The Grange installation.

Scale indicators23 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• EarthCorps: Seattle-based nonprofit focused on volunteer-driven ecological restoration in the Puget Sound region. Highly comparable as it mobilizes young adults and community volunteers for habitat restoration on similar Pacific Northwest watersheds.
• Salmon-Safe: Portland-based parent organization of the Salmon-Safe certification program that Stewardship Partners co-implements in western Washington. Directly comparable as the originating eco-label focused on watershed-protective land management certification across farms, vineyards, and urban sites.
• American Rivers: National nonprofit focused on river and watershed conservation, including wild salmon restoration. Comparable as a river-focused conservation organization, though operating at national scale with policy advocacy rather than regional volunteer restoration.
• Forterra: Pacific Northwest regional land conservation nonprofit that acquires and stewards working lands, including farms. Comparable mission in conserving PNW landscapes, though Forterra focuses more on land acquisition and less on volunteer-driven habitat restoration.
• Trout Unlimited: National coldwater fisheries conservation organization focused on salmonid habitat protection and restoration. Comparable as it prioritizes salmonid habitat similar to Stewardship Partners' salmon-protection work, with a stronger volunteer chapter network and national policy focus.
• Surfrider Foundation: National nonprofit focused on coastal water quality, beach access, and ocean protection. Comparable as a volunteer-chapter-driven environmental nonprofit addressing water pollution, including stormwater runoff, with similar grassroots engagement model.
• Puget Sound Partnership: Washington state agency leading the recovery of Puget Sound ecosystem. Directly comparable as a regional ecosystem restoration coordinating body in the same geography; Stewardship Partners is a key implementation partner on its Action Agenda.
• Washington Environmental Council: Statewide environmental policy and advocacy nonprofit in Washington. Co-founding partner of City Habitats alongside Stewardship Partners. Comparable in PNW environmental mission, with stronger focus on legislative advocacy versus on-the-ground restoration.

Regional players

• Sustainable Connections: Northwest Washington-based nonprofit advancing sustainable business and food systems. Comparable as a regional nonprofit connecting businesses to environmental and sustainability outcomes, though focused more on food/agriculture economy than direct watershed restoration.

Broad incumbents

• The Nature Conservancy (Washington): Global conservation nonprofit with a major Washington chapter actively partnering with Stewardship Partners on City Habitats, stormwater management, and 6PPD-quinone initiatives. Comparable as a much larger conservation organization working on overlapping watershed priorities across a wider portfolio.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/user/StewardshipPartners
• Facebookfacebook.com/StewardshipPartnersWA
• LinkedInlinkedin.com/company/stewardshippartners
• Instagraminstagram.com/stewardshippartners

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Stewardship Partners