Company lists · Data refreshed September 2026
Top 25 Environmental litigation support firms based in Seattle, United States
RevenueBase identified 34 environmental litigation support firms headquartered in Seattle, United States as of September 2026 and tracks 1,221 professional contacts across them, including 789 with verified work emails. Houston is the largest hub.
This list covers environmental litigation support firms 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.
The 25 largest environmental litigation support firms based in Seattle, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 479 contacts → | ||||
Partial evidence “Headquartered in Seattle, Washington, Anchor QEA is a nationally recognized environmental science and engineering consulting firm specializing in aquatic, shoreline, and water…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 184 contacts → | ||||
Partial evidence “Landau Associates is an employee-owned firm that provides environmental consulting and risk management for clients across many disciplines including air, noise, water, permitting…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 176 contacts → | ||||
Partial 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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 49 contacts → | ||||
Indirect evidence “We are trial and appellate lawyers who advise and represent clients in a broad range of business and casualty disputes.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 49 contacts → | ||||
Partial evidence “Hart Crowser’s engineers and scientists have the up-to-date knowledge to support practical designs and recommendations.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 48 contacts → | ||||
Partial 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, 2026Thanks. The Data Team will review it. | |||||
| 7 | 37 contacts → | ||||
Partial evidence “Confluence specializes in environmental science, project delivery, and regulatory strategy and compliance.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 33 contacts → | ||||
Partial 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, 2026Thanks. The Data Team will review it. | |||||
| 9 | 18 contacts → | ||||
Partial evidence “Cascadia Law Group PLLC provides clients with the most effective environmental representation available in our region.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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, 2026Thanks. The Data Team will review it. | |||||
| 11 | 14 contacts → | ||||
Indirect evidence “Since 1980, Raedeke (RAD-ĭ-kee) Associates, Inc.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 10 contacts → | ||||
Partial evidence “Established in 1990, RIDOLFI is an award-winning, small, certified Women’s Business Enterprise (WBE) that specializes in environmental engineering and scientific consulting.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 10 contacts → | ||||
Strong evidence “EcoChem is an environmental consulting firm that specializes in providing quality assurance oversight and management of analytical data in support of various environmental…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 8 contacts → | ||||
Indirect evidence “Plauché & Carr attorneys serve as advocates and counselors to our clients regarding legal and regulatory issues related to natural resource based activities, primarily in marine…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 8 contacts → | ||||
Partial evidence “Pacific Rim Environmental (PacRim) is an environmental consulting firm and laboratory specializing in Regulated Materials Management, asbestos and lead-based paint surveys…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 8 contacts → | ||||
Partial evidence “Green Earth Operations is an environmental science and engineering firm providing objective analysis and environmentally responsible solutions to meet the needs of our clients.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 7 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 7 contacts → | ||||
Partial evidence “Environmental/civil consulting and engineering services.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 6 contacts → | ||||
Partial evidence “Harrigan Leyh Farmer & Thomsen LLP is a Seattle litigation boutique founded in 1986.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 4 contacts → | ||||
Partial evidence “Our diverse group of consultants specialize in Environmental Studies, including Forensic Chemistry, Business-to Business (B2B) Marketing and Management, and Computer Systems…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 3 contacts → | ||||
Indirect evidence “For nearly four decades Osborn Pacific Group Inc.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 2 contacts → | ||||
Partial evidence “We are thrilled to share that Tsongas Litigation Consulting joined IMS Legal Strategies to serve clients better throughout every stage of litigation.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 2 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 2 contacts → | ||||
Partial evidence “The Knowles Group is one of the nation’s leading litigation economics consulting firms, with over 30 years of expert witness experience specializing in quantitating and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 2 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
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 litigation support firms. 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 litigation support firms.
- Partial evidence
- Its own public description names part of environmental litigation support firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name environmental litigation support firms. 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 34 environmental litigation support firms based in Seattle, United States
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 789 reachable decision-makers.
Free signup · no credit card
Environmental litigation support firms based in Seattle, United States at a glance
As of Sep 19, 2026Companies by employee count
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 34 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 litigation support firms, 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 litigation support firms”. 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 litigation support firms), 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 litigation support firms, 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, 789 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 litigation support firms by metro in the United States
- Environmental litigation support firms in Houston55
- Environmental litigation support firms in Austin34
- Environmental litigation support firms in Seattle34
- Environmental litigation support firms in New York32
- Environmental litigation support firms in Los Angeles30
- Environmental litigation support firms in Washington26
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 litigation support firms, 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 litigation support firms are there based in Seattle, United States?
RevenueBase identified 34 environmental litigation support firms 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?
Anchor QEA, headquartered in Seattle, tops this list with the largest team on record.
Which city has the most environmental litigation support firms?
Houston leads with 55 headquartered companies, followed by Austin (34) and Seattle (34).
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 789 verified decision-maker contacts tracked across these 34 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.
Ready to reach these companies? Verified emails and direct dials for all 34 environmental litigation support firms based in Seattle, United States. Start with a free account, no credit card.
Download this list →Related lists
Environmental litigation support firms by geography
- Environmental litigation support firms based in Belo Horizonte, Brazil
- Environmental litigation support firms based in Curitiba, Brazil
- Environmental litigation support firms based in Porto Alegre, Brazil
- Environmental litigation support firms based in Rio De Janeiro, Brazil
- Environmental litigation support firms based in Sao Paulo, Brazil
- Environmental litigation support firms based in Austin, United States
- Environmental litigation support firms based in Houston, United States
- Environmental litigation support firms based in Los Angeles, United States
- Environmental litigation support firms based in New York, United States
- Environmental litigation support firms based in Washington, United States
- Environmental litigation support firms based in Australia
- Environmental litigation support firms based in Belgium
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Environmental litigation support firms based in Belo Horizonte, Brazil
- Environmental litigation support firms based in Curitiba, Brazil
- Environmental litigation support firms based in Porto Alegre, Brazil
- Environmental litigation support firms based in Rio De Janeiro, Brazil
- Environmental litigation support firms based in Sao Paulo, Brazil
- Environmental litigation support firms based in Austin, United States