Company lists · Data refreshed September 2026

Top 25 Environmental assessment firms based in Seattle, United States

Name: Environmental assessment firms 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 44 companies tracked

RevenueBase identified 44 environmental assessment firms headquartered in Seattle, United States as of September 2026 and tracks 2,606 professional contacts across them, including 1,555 with verified work emails. Houston is the largest hub.

This list covers environmental assessment 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.

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

44Companies

2,606Contacts tracked

1,555Verified emails

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The 25 largest environmental assessment firms based in Seattle, United States

Ranked by team size

Top 25 of 44 environmental assessment firms 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 assessment firms: 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	Parametrix	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	501-1,000	880 contacts →
	Indirect evidence “At Parametrix, we help our clients imagine what's possible.” Source: RevenueBase Database · checked Sep 19, 2026
2	Anchor QEA	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	501-1,000	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, 2026
3	Landau Associates	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	51-200	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, 2026
4	Herrera Environmental Consultants	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	51-200	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, 2026
5	Cascadia Consulting Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	51-200	110 contacts →
	Partial evidence “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Source: RevenueBase Database · checked Sep 19, 2026
6	Hart Crowser, A Division Of Haley & Aldrich	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	51-200	49 contacts →
	Indirect 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, 2026
7	Floyd Snider	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	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, 2026
8	Confluence Environmental Company	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	37 contacts →
	Partial evidence “Confluence specializes in environmental science, project delivery, and regulatory strategy and compliance.” Source: RevenueBase Database · checked Sep 19, 2026
9	Soundearth Strategies, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	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, 2026
10	NVL Laboratories, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	31 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
11	MIG SVR	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	201-500	29 contacts →
	Partial evidence “SvR Design Company was founded in 1989 with a mission of providing innovation in the built environment.” Source: RevenueBase Database · checked Sep 19, 2026
12	Windward Environmental	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	16 contacts →
	Partial 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
13	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
14	Tree Solutions INC	Indirect evidence	Seattle, United StatesHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “Urban Forestry and Arboriculture Consulting Services Tree Solutions Inc.” Source: RevenueBase Database · checked Sep 19, 2026
15	Jacobson Consulting Engineers	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	12 contacts →
	Indirect evidence “Your trusted partners, delivering innovative solutions and expert civil site development.” Source: RevenueBase Database · checked Sep 19, 2026
16	EHS International, Inc., Seattle, WA	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	10 contacts →
	Strong evidence “EHS-International, Inc.(EHSI) is a small business that specializes in providing environmental consulting and industrial hygiene services directed towards environmental assessment…” Source: RevenueBase Database · checked Sep 19, 2026
17	Ridolfi INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	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, 2026
18	Ecochem, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	1-10	10 contacts →
	Partial 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, 2026
19	Clearway Environmental LLC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	8 contacts →
	Partial evidence “Clearway Environmental provides natural resources analyses, habitat restoration, environmental compliance, and fisheries services for transportation and natural resources projects.” Source: RevenueBase Database · checked Sep 19, 2026
20	Pacific RIM Environmental, Inc. Pacrim	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	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, 2026
21	Green Earth Operations, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	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, 2026
22	DH Environmental, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	7 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
23	Crete Consulting INC	Partial evidence	Seattle, United StatesHQ checked Sep 19, 2026	1-10	7 contacts →
	Partial evidence “Environmental/civil consulting and engineering services.” Source: RevenueBase Database · checked Sep 19, 2026
24	Kane Environmental, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	7 contacts →
	Partial evidence “Kane Environmental, Inc.(Kane Environmental) is an SBE and woman-owned full-service environmental consulting firm with headquarters in Seattle, Washington.” Source: RevenueBase Database · checked Sep 19, 2026
25	Hawk Environmental Services, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	1-10	4 contacts →
	Partial evidence “Hawk Environmental Services, Inc offers unbiased neutral inspection and testing services to ensure that you are getting the information you need without any focus on selling…” 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 assessment 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 assessment firms.
Partial evidence: Its own public description names part of environmental assessment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental assessment 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 44 environmental assessment firms based in Seattle, United States

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Environmental assessment firms based in Seattle, United States at a glance

As of Sep 19, 2026

59.7%Verified-email coverage

59.2Average contacts per company

11-50Median size (employees)

193.2%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 44 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 assessment 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 assessment 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 assessment 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 assessment 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, 1,555 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 assessment firms 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 assessment 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 assessment firms are there based in Seattle, United States?

RevenueBase identified 44 environmental assessment 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?

Parametrix, headquartered in Seattle, tops this list with the largest team on record.

Which city has the most environmental assessment firms?

Houston leads with 85 headquartered companies, followed by New York (50) and Seattle (44).

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 1,555 verified decision-maker contacts tracked across these 44 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.