Company lists · Data refreshed September 2026

Top 25 Environmental organizations based in Seattle, United States

Name: Environmental organizations based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 88 companies tracked

RevenueBase identified 88 environmental organizations headquartered in Seattle, United States as of September 2026 and tracks 1,614 professional contacts across them, including 911 with verified work emails. Washington is the largest hub.

This list covers environmental organizations headquartered in Seattle, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

88Companies

1,614Contacts tracked

911Verified emails

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The 25 largest environmental organizations based in Seattle, United States

Ranked by team size

Top 25 of 88 environmental organizations based in Seattle, United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental organizations: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Herrera Environmental Consultants	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	51-200	176 contacts →
	Strong evidence “Herrera Environmental Consultants is a leading engineering and scientific consulting firm focused on restoration, water, and sustainable development.” Source: RevenueBase Database · checked Sep 19, 2026
2	Cascadia Consulting Group	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	51-200	110 contacts →
	Strong evidence “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Source: RevenueBase Database · checked Sep 19, 2026
3	Earthcorps	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	83 contacts →
	Strong evidence “EarthCorps cultivates leaders and community partnerships to advance environmental justice.” Source: RevenueBase Database · checked Sep 19, 2026
4	Forterra NW	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	68 contacts →
	Indirect evidence “OUR MISSION Forterra innovates and scales land-based solutions to address the climate crisis and support equitable, green, and prosperous communities.” Source: RevenueBase Database · checked Sep 19, 2026
5	NIA Tero	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	54 contacts →
	Indirect evidence “The governance systems and cultural wisdom sustained by Indigenous Peoples have significant impact on the health of the ecosystems where they live.” Source: RevenueBase Database · checked Sep 19, 2026
6	Washington Conservation Action	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	51 contacts →
	Strong evidence “Washington Conservation Action’s mission is to advocate for environmental progress and justice through actions that mobilize the public, elect champions for the environment, and…” Source: RevenueBase Database · checked Sep 19, 2026
7	Floyd Snider	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	48 contacts →
	Strong evidence “Floyd\|Snider is a multi-disciplinary environmental consulting firm providing engineering, strategic project management, and scientific expertise to achieve balanced solutions to…” Source: RevenueBase Database · checked Sep 19, 2026
8	Soundearth Strategies, INC	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	33 contacts →
	Strong evidence “SoundEarth is a 100% employee-owned environmental consulting firm with more than 40 dedicated and talented professionals working together to improve the environment in which we…” Source: RevenueBase Database · checked Sep 19, 2026
9	ECOSS	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	25 contacts →
	Strong evidence “Mission: ECOSS is devoted to promoting environmental justice and sustainability in an effort to build immigrant and refugee communities that can shape their environmental futures.” Source: RevenueBase Database · checked Sep 19, 2026
10	Front And Centered	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	23 contacts →
	Strong evidence “Communities of color, people with lower incomes, and indigenous people are on the frontlines of climate and environmental change.” Source: RevenueBase Database · checked Sep 19, 2026
11	Birds Connect Seattle	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	22 contacts →
	Indirect evidence “Birds Connect Seattle advocates and organizes for cities where people and birds thrive.” Source: RevenueBase Database · checked Sep 19, 2026
12	Toxic-Free Future	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	21 contacts →
	Strong evidence “Toxic-Free Future is a national leader in environmental health research and advocacy.” Source: RevenueBase Database · checked Sep 19, 2026
13	NW Energy Coalition	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	1-10	21 contacts →
	Strong evidence “The NW Energy Coalition is an alliance of around 100 environmental, civic, and human service organizations, progressive utilities, and businesses in Oregon, Washington, Idaho…” Source: RevenueBase Database · checked Sep 19, 2026
14	Washington Journal Of Social & Environmental Justice	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	21 contacts →
	Strong evidence “The Washington Journal of Social & Environmental Justice publishes legal scholarship examining how communities interact with each other and the environment with the goal of…” Source: RevenueBase Database · checked Sep 19, 2026
15	Cascadia LAW Group Pllc	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	18 contacts →
	Strong evidence “Cascadia Law Group PLLC provides clients with the most effective environmental representation available in our region.” Source: RevenueBase Database · checked Sep 19, 2026
16	Washington's National Park Fund	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	1-10	16 contacts →
	Indirect evidence “Washington's National Park Fund's mission is to raise funds to preserve and enhance the natural beauty, cultural heritage, and recreational opportunities of Mount Rainier, North…” Source: RevenueBase Database · checked Sep 19, 2026
17	Windward Environmental	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	16 contacts →
	Strong evidence “Windward Environmental specializes in providing solutions for clients needing programmatic, technical, or logistical support for managing environmental concerns.” Source: RevenueBase Database · checked Sep 19, 2026
18	Raedeke Associates, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “Since 1980, Raedeke (RAD-ĭ-kee) Associates, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
19	Pollution Prevention Resource Center	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “The Pollution Prevention Resource Center (PPRC), a 501(c)(3) nonprofit organization, is a leading source of high-quality, unbiased pollution prevention information.” Source: RevenueBase Database · checked Sep 19, 2026
20	Earthgen	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	14 contacts →
	Strong evidence “EarthGen equips young people to become changemakers for a healthy environment.” Source: RevenueBase Database · checked Sep 19, 2026
21	Duwamish River Community Coalition	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	1-10	13 contacts →
	Strong evidence “DRCC has never delved into the delineation between Superfund site and affected community-in our view, environmental justice concerns inextricably link harmful pollutant practices…” Source: RevenueBase Database · checked Sep 19, 2026
22	Wilburforce Foundation	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	12 contacts →
	Strong evidence “WILBURFORCE FOUNDATION is an environmental services company based out of 2034 Nw 56Th St,# 300, Seattle, Washington, United States.” Source: RevenueBase Database · checked Sep 19, 2026
23	Washington Wild	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	1-10	12 contacts →
	Indirect evidence “Washington Wild protects and restores wild lands and waters in Washington State through advocacy, education, and civic engagement.” Source: RevenueBase Database · checked Sep 19, 2026
24	Basilica BIO	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	1-10	11 contacts →
	Strong evidence “How do we build resilience in frontline communities most affected by the environmental crisis?” Source: RevenueBase Database · checked Sep 19, 2026
25	Post84	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	11 contacts →
	Strong evidence “POST 84 is a student-focused outdoor education organization that strives to encourage environmental awareness, leadership, diversity, self-confidence, and knowledge of the…” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: environmental organizations. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names environmental organizations.
Partial evidence: Its own public description names part of environmental organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental organizations. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 88 environmental organizations based in Seattle, United States

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Environmental organizations based in Seattle, United States at a glance

As of Sep 19, 2026

56.4%Verified-email coverage

18.3Average contacts per company

1-10Median size (employees)

237.5%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Seattle, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 88 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among environmental organizations, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Seattle, United States whose own description of what they do matches “environmental organizations”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names environmental organizations), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among environmental organizations, and records with no verified work email. Companies headquartered outside Seattle are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 911 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Environmental organizations by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names environmental organizations, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many environmental organizations are there based in Seattle, United States?

RevenueBase identified 88 environmental organizations headquartered in Seattle, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Herrera Environmental Consultants, headquartered in Seattle, tops this list with the largest team on record.

Which city has the most environmental organizations?

Washington leads with 209 headquartered companies, followed by New York (204) and Los Angeles (133).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 911 verified decision-maker contacts tracked across these 88 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.