Company lists · Data refreshed September 2026

Top 25 Geotechnical engineering staffing companies based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 4,059 companies tracked

RevenueBase identified 4,059 geotechnical engineering staffing companies headquartered in the United States as of September 2026 and tracks 107,711 professional contacts across them, including 42,303 with verified work emails. Houston is the largest hub.

This list covers geotechnical engineering staffing companies 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 28, 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 28, 2026 86% judged on-target in blind review

4,059Companies

107,711Contacts tracked

42,303Verified emails

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The 25 largest geotechnical engineering staffing companies based in the United States

Ranked by team size

Top 25 of 4,059 geotechnical engineering staffing companies based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to geotechnical engineering staffing companies: 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 28, 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 28, 2026
2	ECS Group Of Companies	Partial evidence	Chantilly, VA, United StatesHQ checked Sep 28, 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 28, 2026
3	Bowman Consulting	Partial evidence	Reston, VA, United StatesHQ checked Sep 28, 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 28, 2026
4	UES	Partial evidence	Orlando, FL, United StatesHQ checked Sep 28, 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 28, 2026
5	Construction Labor Contractors	Partial evidence	Round Rock, TX, United StatesHQ checked Sep 28, 2026	501-1,000	1,234 contacts →
	Partial evidence “Let us make construction staffing work for you.” Source: RevenueBase Database · checked Sep 28, 2026
6	Contech Engineered Solutions	Indirect evidence	West Chester, OH, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,217 contacts →
	Indirect evidence “Contech provides innovative, cost-effective site solutions to engineers, contractors, and developers on projects across North America.” Source: RevenueBase Database · checked Sep 28, 2026
7	TRS Staffing Solutions	Strong evidence	Greenville, United StatesHQ checked Sep 28, 2026	201-500	1,187 contacts →
	Strong evidence “TRS Staffing Solutions is a world leading engineering recruitment agency specialising in the recruitment and supply of professional, engineering, technical and field talent.” Source: RevenueBase Database · checked Sep 28, 2026
8	Timmons Group	Partial evidence	Richmond, VA, United StatesHQ checked Sep 28, 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 28, 2026
9	GZA Geoenvironmental, INC	Indirect evidence	Norwood, MA, United StatesHQ checked Sep 28, 2026	501-1,000	880 contacts →
	Indirect 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 28, 2026
10	Mckim & Creed, INC	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 28, 2026	501-1,000	759 contacts →
	Indirect evidence “What if you had the opportunity to do something you love and make a difference in peoples' lives at the same time?” Source: RevenueBase Database · checked Sep 28, 2026
11	Schnabel Engineering	Indirect evidence	Glen Allen, VA, United StatesHQ checked Sep 28, 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 28, 2026
12	Tower Engineering Professionals	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 28, 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 28, 2026
13	Overland Contracting INC	Indirect evidence	Garner, NC, United StatesHQ checked Sep 28, 2026	1,001-5,000	690 contacts →
	Indirect evidence “Overland Contracting Inc,(OCI) is a Black & Veatch Company (BV) that provides construction services in the open/merit shop arena.” Source: RevenueBase Database · checked Sep 28, 2026
14	Hirequest Direct	Indirect evidence	Nashville, TN, United StatesHQ checked Sep 28, 2026	n/a	618 contacts →
	Indirect evidence “HireQuest Direct specializes in day labor, general labor, disaster recovery, skilled labor, janitorial, site clean-up, composite crew, demolition, administrative, hospitality…” Source: RevenueBase Database · checked Sep 28, 2026
15	Neel-Schaffer, INC	Partial evidence	Jackson, MS, United StatesHQ checked Sep 28, 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 28, 2026
16	Volt Technical Resources	Indirect evidence	Orange, CA, United StatesHQ checked Sep 28, 2026	5,001-10,000	584 contacts →
	Indirect evidence “A Six Sigma Company ~61 years in the industry ~Nationwide 4 million+ candidate database ~Fortune Company ~Extensive E-Recruiting capabilities ~Reference and Employment check…” Source: RevenueBase Database · checked Sep 28, 2026
17	Raba Kistner, INC	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 28, 2026	501-1,000	582 contacts →
	Indirect evidence “Founded in 1968, Raba Kistner Inc.” Source: RevenueBase Database · checked Sep 28, 2026
18	DOWL	Indirect evidence	Bellevue, WA, United StatesHQ checked Sep 28, 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 28, 2026
19	Tech USA	Partial evidence	Millersville, MD, United StatesHQ checked Sep 28, 2026	501-1,000	541 contacts →
	Partial evidence “A premier provider of staffing solutions, Tech USA is in the top 1% of the Recruiting Industry.” Source: RevenueBase Database · checked Sep 28, 2026
20	EASI	Indirect evidence	Hanover, MD, United StatesHQ checked Sep 28, 2026	1,001-5,000	526 contacts →
	Indirect evidence “EASi is now Actalent.” Source: RevenueBase Database · checked Sep 28, 2026
21	Nova Engineering And Environmental, LLC	Strong evidence	Kennesaw, GA, United StatesHQ checked Sep 28, 2026	501-1,000	518 contacts →
	Strong evidence “Established in 1996, NOVA was originally founded to provide Environmental Consulting, Geotechnical Engineering, and Construction Materials Testing and Inspection services to the…” Source: RevenueBase Database · checked Sep 28, 2026
22	Trillium Construction Services	Indirect evidence	Kalamazoo, MI, United StatesHQ checked Sep 28, 2026	201-500	494 contacts →
	Indirect evidence “Trillium Construction Services has over a quarter of a century of experience in the construction recruiting industry.” Source: RevenueBase Database · checked Sep 28, 2026
23	Tectonic Engineering Consultants, Geologists & Land Surveyors, D.P.C	Indirect evidence	Mountainville, United StatesHQ checked Sep 28, 2026	501-1,000	487 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
24	Entact, LLC	Partial evidence	Westmont, IL, United StatesHQ checked Sep 28, 2026	501-1,000	483 contacts →
	Partial evidence “ENTACT is the partner of choice in solving our customer's most complex environmental remediation and geotechnical infrastructure challenges.” Source: RevenueBase Database · checked Sep 28, 2026
25	Geoengineers INC	Indirect evidence	Redmond, WA, United StatesHQ checked Sep 28, 2026	201-500	479 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 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 staffing companies. 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 staffing companies.
Partial evidence: Its own public description names part of geotechnical engineering staffing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geotechnical engineering staffing companies. 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 4,059 geotechnical engineering staffing companies based in the United States

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Geotechnical engineering staffing companies based in the United States at a glance

As of Sep 28, 2026

39.3%Verified-email coverage

26.5Average contacts per company

11-50Median size (employees)

3.4%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,751

11-50

1,448

51-200

642

201-500

126

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 4,059 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 staffing companies, 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 staffing companies”. 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 staffing companies), 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 staffing companies, 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, 42,303 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 28, 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 staffing companies 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 staffing companies, 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 staffing companies are there based in the United States?

RevenueBase identified 4,059 geotechnical engineering staffing companies 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 staffing companies?

Houston leads with 136 headquartered companies, followed by New York (57) and Austin (48).

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 42,303 verified decision-maker contacts tracked across these 4,059 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 28, 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.