Company lists · Data refreshed September 2026

Top 25 Geotechnical engineering consultants based in the United States

Name: Geotechnical engineering consultants based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 6,479 companies tracked

RevenueBase identified 6,479 geotechnical engineering consultants headquartered in the United States as of September 2026 and tracks 150,144 professional contacts across them, including 72,470 with verified work emails. Houston is the largest hub.

This list covers geotechnical engineering consultants headquartered in the 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 21, 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 21, 2026 86% judged on-target in blind review

6,479Companies

150,144Contacts tracked

72,470Verified emails

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The 25 largest geotechnical engineering consultants based in the United States

Ranked by team size

Top 25 of 6,479 geotechnical engineering consultants based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to geotechnical engineering consultants: 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	Terracon	Partial evidence	Olathe, KS, United StatesHQ checked Sep 21, 2026	5,001-10,000	6,113 contacts →
	Partial evidence “Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Source: RevenueBase Database · checked Sep 21, 2026
2	ECS Group Of Companies	Partial evidence	Chantilly, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,210 contacts →
	Partial evidence “ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.” Source: RevenueBase Database · checked Sep 21, 2026
3	Bowman Consulting	Partial evidence	Reston, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,666 contacts →
	Partial evidence “Headquartered in Reston, Virginia, Bowman is a national engineering services firm delivering infrastructure solutions to customers who own, develop and maintain the built…” Source: RevenueBase Database · checked Sep 21, 2026
4	UES	Partial evidence	Orlando, FL, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,595 contacts →
	Partial evidence “UES provides professional engineering, environmental, testing and inspection services to clients across the United States.” Source: RevenueBase Database · checked Sep 21, 2026
5	Partner Engineering & Science, INC	Indirect evidence	Torrance, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,358 contacts →
	Indirect evidence “Partner Assessment Corp.” Source: RevenueBase Database · checked Sep 21, 2026
6	GPI Greenman-Pedersen, INC	Partial evidence	Melville, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,354 contacts →
	Partial evidence “With a staff of over 1,800 professionals, Greenman-Pedersen, Inc.(GPI) is a leading engineering consulting firm that specializes in the innovative design and construction of…” Source: RevenueBase Database · checked Sep 21, 2026
7	Walter P Moore	Indirect evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,298 contacts →
	Indirect evidence “Welcome to Walter P Moore!” Source: RevenueBase Database · checked Sep 21, 2026
8	Atwell, LLC	Partial evidence	Southfield, MI, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,290 contacts →
	Partial evidence “Atwell is a full-service consulting, engineering and construction services firm that delivers a broad range of creative solutions to clients in the real estate and land…” Source: RevenueBase Database · checked Sep 21, 2026
9	Knight Piesold	Indirect evidence	Denver, CO, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,231 contacts →
	Indirect evidence “Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Source: RevenueBase Database · checked Sep 21, 2026
10	Volkert, INC	Indirect evidence	Mobile, AL, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,199 contacts →
	Indirect evidence “Volkert’s history began in 1925 when it was founded in New Orleans as Doullut & Erwin to provide waterfront and heavy construction services, as well as airport design services…” Source: RevenueBase Database · checked Sep 21, 2026
11	Rimkus	Partial evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,184 contacts →
	Partial evidence “Consultants.” Source: RevenueBase Database · checked Sep 21, 2026
12	Timmons Group	Partial evidence	Richmond, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,066 contacts →
	Partial evidence “Timmons Group is an engineering & technology firm specializing in civil, environmental, GIS, and surveying services to clients across the US.” Source: RevenueBase Database · checked Sep 21, 2026
13	Simpson Gumpertz & Heger SGH	Partial evidence	Waltham, MA, United StatesHQ checked Sep 21, 2026	501-1,000	942 contacts →
	Partial evidence “Simpson Gumpertz & Heger (SGH) is a national engineering firm committed to delivering holistic advice for our clients’ most complex challenges.” Source: RevenueBase Database · checked Sep 21, 2026
14	Wiss, Janney, Elstner Associates, INC	Indirect evidence	Northbrook, IL, United StatesHQ checked Sep 21, 2026	501-1,000	895 contacts →
	Indirect evidence “Founded in 1956, Wiss, Janney, Elstner Associates (WJE) is an interdisciplinary firm of engineers, architects, and materials scientists committed to helping clients solve, repair…” Source: RevenueBase Database · checked Sep 21, 2026
15	GZA Geoenvironmental, INC	Partial evidence	Norwood, MA, United StatesHQ checked Sep 21, 2026	501-1,000	880 contacts →
	Partial evidence “Founded in 1964 as a soils and foundations specialty consultant, GZA GeoEnvironmental, Inc.(GZA) has grown into a full-service company providing its clients with highly…” Source: RevenueBase Database · checked Sep 21, 2026
16	Coffman Engineers	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	501-1,000	859 contacts →
	Indirect evidence “The right team is more than an advantage.” Source: RevenueBase Database · checked Sep 21, 2026
17	Professional Service Industries, Inc. PSI	Indirect evidence	Arlington Heights, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	778 contacts →
	Indirect evidence “Intertek, a leading provider of quality solutions to industries around the world, has completed the acquisition of Professional Service Industries, Inc.(PSI), a leading…” Source: RevenueBase Database · checked Sep 21, 2026
18	Schnabel Engineering	Indirect evidence	Glen Allen, VA, United StatesHQ checked Sep 21, 2026	501-1,000	707 contacts →
	Indirect evidence “Schnabel is a trusted partner in building the foundation for project success.” Source: RevenueBase Database · checked Sep 21, 2026
19	Tower Engineering Professionals	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 21, 2026	1,001-5,000	707 contacts →
	Indirect evidence “Tower Engineer Professionals was founded in 1997 by two tower-climbing engineers.” Source: RevenueBase Database · checked Sep 21, 2026
20	Quiddity	Partial evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	501-1,000	683 contacts →
	Partial evidence “Quiddity is an award-winning, full-service civil engineering, planning, surveying, and consulting firm providing innovative solutions for public infrastructure and private…” Source: RevenueBase Database · checked Sep 21, 2026
21	Whitman, Requardt And Associates, LLP	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	501-1,000	601 contacts →
	Partial evidence “Established in 1915, WRA is a nationally-recognized engineering, architectural and environmental planning firm with a reputation for delivering exceptional work on time and within…” Source: RevenueBase Database · checked Sep 21, 2026
22	Neel-Schaffer, INC	Partial evidence	Jackson, MS, United StatesHQ checked Sep 21, 2026	501-1,000	591 contacts →
	Partial evidence “Neel-Schaffer is a multi-disciplined engineering, planning and construction management firm that was founded in 1983 and today is one of the largest private, employee-owned…” Source: RevenueBase Database · checked Sep 21, 2026
23	Raba Kistner, INC	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 21, 2026	501-1,000	582 contacts →
	Indirect evidence “Founded in 1968, Raba Kistner Inc.” Source: RevenueBase Database · checked Sep 21, 2026
24	DRMP	Partial evidence	Orlando, FL, United StatesHQ checked Sep 21, 2026	501-1,000	567 contacts →
	Partial evidence “Founded in 1977, DRMP is a multi-discipline civil engineering and surveying firm that develops innovative and sustainable design solutions for infrastructure in the public…” Source: RevenueBase Database · checked Sep 21, 2026
25	DOWL	Indirect evidence	Bellevue, WA, United StatesHQ checked Sep 21, 2026	501-1,000	547 contacts →
	Indirect evidence “For more than 60 years, it has been the quality of our people that defines the DOWL difference.” Source: RevenueBase Database · checked Sep 21, 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: geotechnical engineering consultants. 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 geotechnical engineering consultants.
Partial evidence: Its own public description names part of geotechnical engineering consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geotechnical engineering consultants. 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 6,479 geotechnical engineering consultants based in the United States

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Geotechnical engineering consultants based in the United States at a glance

As of Sep 21, 2026

48.3%Verified-email coverage

23.2Average contacts per company

11-50Median size (employees)

2.6%Largest-city concentration · Houston

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

3,004

11-50

2,444

51-200

820

201-500

120

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 6,479 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 geotechnical engineering consultants, 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 the United States whose own description of what they do matches “geotechnical engineering consultants”. 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 geotechnical engineering consultants), 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 geotechnical engineering consultants, and records with no verified work email. Companies headquartered outside United States 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, 72,470 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 21, 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.

Geotechnical engineering consultants by metro

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 geotechnical engineering consultants, 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 geotechnical engineering consultants are there based in the United States?

RevenueBase identified 6,479 geotechnical engineering consultants headquartered in the 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?

Terracon, headquartered in Olathe, tops this list with the largest team on record.

Which city has the most geotechnical engineering consultants?

Houston leads with 169 headquartered companies, followed by New York (107) and Austin (73).

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 72,470 verified decision-maker contacts tracked across these 6,479 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 21, 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.