Company lists · Data refreshed September 2026

Top 25 Scientific consulting firms based in Seattle, United States

Name: Scientific consulting 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 14, 2026 77 companies tracked

RevenueBase identified 77 scientific consulting firms headquartered in Seattle, United States as of September 2026 and tracks 2,964 professional contacts across them, including 1,694 with verified work emails. Houston is the largest hub.

This list covers scientific consulting 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 14, 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 14, 2026 86% judged on-target in blind review

77Companies

2,964Contacts tracked

1,694Verified emails

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The 25 largest scientific consulting firms based in Seattle, United States

Ranked by team size

Top 25 of 77 scientific consulting firms based in Seattle, United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to scientific consulting 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	Coffman Engineers	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	501-1,000	859 contacts →
	Indirect evidence “The right team is more than an advantage.” Source: RevenueBase Database · checked Sep 14, 2026
2	Anchor QEA	Partial evidence	Seattle, WA, United StatesHQ checked Sep 14, 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 14, 2026
3	Harris Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	51-200	178 contacts →
	Partial evidence “Harris Group is a multidiscipline engineering consulting firm with offices located throughout the United States.” Source: RevenueBase Database · checked Sep 14, 2026
4	Herrera Environmental Consultants	Strong evidence	Seattle, WA, United StatesHQ checked Sep 14, 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 14, 2026
5	Cascadia Consulting Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 14, 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 14, 2026
6	BHC Consultants	Partial evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	51-200	109 contacts →
	Partial evidence “BHC Consultants, LLC (BHC) is an employee owned and managed consulting, engineering, building code and construction compliance, and planning firm with offices in Seattle and…” Source: RevenueBase Database · checked Sep 14, 2026
7	YA Engineering Services	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	51-200	108 contacts →
	Indirect evidence “YA Engineering Services is now part of YA Group.” Source: RevenueBase Database · checked Sep 14, 2026
8	Hart Crowser, A Division Of Haley & Aldrich	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 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 14, 2026
9	Floyd Snider	Strong evidence	Seattle, WA, United StatesHQ checked Sep 14, 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 14, 2026
10	Confluence Environmental Company	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	11-50	37 contacts →
	Indirect evidence “Confluence specializes in environmental science, project delivery, and regulatory strategy and compliance.” Source: RevenueBase Database · checked Sep 14, 2026
11	Soundearth Strategies, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 14, 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 14, 2026
12	NVL Laboratories, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	11-50	31 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
13	Watershed Science & Engineering	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	11-50	16 contacts →
	Indirect evidence “At WSE, our focus is on service.” Source: RevenueBase Database · checked Sep 14, 2026
14	Nickerson And Associates LLC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	11-50	16 contacts →
	Partial evidence “Nickerson and Associates LLC is a Seattle-based consulting firm specializing in applying economics, statistics, and computer-related analyses to business and public policy issues…” Source: RevenueBase Database · checked Sep 14, 2026
15	Intertox, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	1-10	15 contacts →
	Indirect evidence “We make science talk.” Source: RevenueBase Database · checked Sep 14, 2026
16	Raedeke Associates, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	11-50	14 contacts →
	Indirect evidence “Since 1980, Raedeke (RAD-ĭ-kee) Associates, Inc.” Source: RevenueBase Database · checked Sep 14, 2026
17	Hainline	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	11-50	12 contacts →
	Indirect evidence “HAINLINE was founded in 1981 to assist owners, architects, and contractors in the construction process.” Source: RevenueBase Database · checked Sep 14, 2026
18	KE AD Building Consultants Kent Engineering Architectural Diagnostics	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	11-50	11 contacts →
	Indirect evidence “KE\|AD (Kent Engineering \| Architectural Diagnostics) has office's in both Seattle and Hawaii.” Source: RevenueBase Database · checked Sep 14, 2026
19	Guidance Engineering	Strong evidence	Seattle, United StatesHQ checked Sep 14, 2026	1-10	10 contacts →
	Strong evidence “Guidance Engineering and Applied Research is an engineering and scientific consulting company that provides scientific information for clients who need answers to complex…” Source: RevenueBase Database · checked Sep 14, 2026
20	Ridolfi INC	Strong evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	11-50	10 contacts →
	Strong 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 14, 2026
21	Ecochem, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 14, 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 14, 2026
22	Pacific RIM Environmental, Inc. Pacrim	Partial evidence	Seattle, WA, United StatesHQ checked Sep 14, 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 14, 2026
23	Green Earth Operations, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	11-50	8 contacts →
	Indirect 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 14, 2026
24	DH Environmental, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	11-50	7 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
25	Stratusg Consulting	Partial evidence	Seattle, United StatesHQ checked Sep 14, 2026	11-50	7 contacts →
	Partial evidence “StratusG Consulting is a business and technology consulting firm with over 22 years of experience working with clients in the life science industry.” Source: RevenueBase Database · checked Sep 14, 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: scientific consulting 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 scientific consulting firms.
Partial evidence: Its own public description names part of scientific consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name scientific consulting 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 77 scientific consulting firms based in Seattle, United States

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Scientific consulting firms based in Seattle, United States at a glance

As of Sep 14, 2026

57.2%Verified-email coverage

38.5Average contacts per company

1-10Median size (employees)

236.4%Largest-city concentration · Houston

Sep 14, 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 77 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 scientific consulting 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 “scientific consulting 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 scientific consulting 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 scientific consulting 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, 1,694 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 14, 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.

Scientific consulting 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 scientific consulting 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 scientific consulting firms are there based in Seattle, United States?

RevenueBase identified 77 scientific consulting 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?

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

Which city has the most scientific consulting firms?

Houston leads with 182 headquartered companies, followed by New York (125) and San Diego (95).

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 1,694 verified decision-maker contacts tracked across these 77 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 14, 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.