Company lists · Data refreshed October 2026

Top 25 Geological engineering consultants based in the United States

Name: Geological 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 Oct 13, 2026 5,078 companies tracked

RevenueBase identified 5,078 company matches for geological engineering consultants associated with the United States as of October 2026 and tracks 125,330 professional contacts across them, including 61,033 with verified work emails. Houston is the largest hub.

This list covers company matches for geological engineering consultants associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 13, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Oct 13, 2026 How this list was built

5,078Companies

125,330Contacts tracked

61,033Verified emails

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The 25 largest geological engineering consultants based in the United States

Ranked by team size

Top 25 of 5,078 company matches for geological engineering consultants based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 13, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Terracon	Exact match	Olathe, KS, United StatesHQ recorded Oct 13, 2026	5,001-10,000	6,380 contacts →
	Exact match “Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
2	Geosyntec Consultants	Exact match	Boca Raton, FL, United StatesHQ recorded Oct 13, 2026	1,001-5,000	2,521 contacts →
	Exact match “Geosyntec is a consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
3	Langan Engineering & Environmental Services	Exact match	Parsippany, NJ, United StatesHQ recorded Oct 13, 2026	1,001-5,000	2,402 contacts →
	Exact match “Langan's client-focused, highly entrepreneurial culture cultivates an environment of opportunities in which career growth and teamwork flourish.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
4	ECS Group Of Companies	Exact match	Chantilly, VA, United StatesHQ recorded Oct 13, 2026	1,001-5,000	2,259 contacts →
	Exact match “ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
5	Bowman Consulting	Exact match	Reston, VA, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,778 contacts →
	Exact match “Headquartered in Reston, Virginia, Bowman is a national engineering services firm delivering infrastructure solutions to customers who own, develop and maintain the built…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
6	UES	Exact match	Orlando, FL, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,643 contacts →
	Exact match “UES provides professional engineering, environmental, testing and inspection services to clients across the United States.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
7	Partner Engineering & Science, INC	Exact match	Torrance, CA, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,418 contacts →
	Exact match “Partner Assessment Corp.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
8	Walter P Moore	Exact match	Houston, TX, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,404 contacts →
	Exact match “Welcome to Walter P Moore!” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
9	Knight Piesold	Exact match	Denver, CO, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,326 contacts →
	Exact match “Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
10	Timmons Group	Exact match	Richmond, VA, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,122 contacts →
	Exact match “Timmons Group is an engineering & technology firm specializing in civil, environmental, GIS, and surveying services to clients across the US.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
11	Barr Engineering CO	Exact match	Minneapolis, MN, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,108 contacts →
	Exact match “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
12	S&me	Exact match	Raleigh, NC, United StatesHQ recorded Oct 13, 2026	1,001-5,000	1,084 contacts →
	Exact match “We are S & ME.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
13	GZA Geoenvironmental, INC	Exact match	Norwood, MA, United StatesHQ recorded Oct 13, 2026	501-1,000	903 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
14	Coffman Engineers	Exact match	Seattle, WA, United StatesHQ recorded Oct 13, 2026	501-1,000	889 contacts →
	Exact match “The right team is more than an advantage.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
15	Professional Service Industries, Inc. PSI	Exact match	Arlington Heights, IL, United StatesHQ recorded Oct 13, 2026	1,001-5,000	776 contacts →
	Exact match “Intertek, a leading provider of quality solutions to industries around the world, has completed the acquisition of Professional Service Industries, Inc.(PSI), a leading…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
16	Schnabel Engineering	Exact match	Glen Allen, VA, United StatesHQ recorded Oct 13, 2026	501-1,000	759 contacts →
	Exact match “Schnabel is a trusted partner in building the foundation for project success.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
17	Whitman, Requardt And Associates, LLP	Exact match	Baltimore, MD, United StatesHQ recorded Oct 13, 2026	501-1,000	636 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
18	Raba Kistner, INC	Exact match	San Antonio, TX, United StatesHQ recorded Oct 13, 2026	501-1,000	602 contacts →
	Exact match “Founded in 1968, Raba Kistner Inc.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
19	DOWL	Exact match	Bellevue, WA, United StatesHQ recorded Oct 13, 2026	501-1,000	571 contacts →
	Exact match “For more than 60 years, it has been the quality of our people that defines the DOWL difference.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
20	Tower Engineering Professionals	Exact match	Raleigh, NC, United StatesHQ recorded Oct 13, 2026	1,001-5,000	541 contacts →
	Exact match “Tower Engineer Professionals was founded in 1997 by two tower-climbing engineers.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
21	Nova Engineering And Environmental, LLC	Exact match	Kennesaw, GA, United StatesHQ recorded Oct 13, 2026	501-1,000	518 contacts →
	Exact match “Established in 1996, NOVA was originally founded to provide Environmental Consulting, Geotechnical Engineering, and Construction Materials Testing and Inspection services to the…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
22	Thomas & Hutton	Exact match	Savannah, GA, United StatesHQ recorded Oct 13, 2026	501-1,000	515 contacts →
	Exact match “Our story began in 1946 with the collaboration of former US Army Corps of Engineers Officers, Hue Thomas and Joe Hutton, in their start-up engineering firm in Savannah, GA.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
23	Tectonic Engineering Consultants, Geologists & Land Surveyors, D.P.C	Exact match	Mountainville, United StatesHQ recorded Oct 13, 2026	501-1,000	508 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
24	Entact, LLC	Exact match	Westmont, IL, United StatesHQ recorded Oct 13, 2026	501-1,000	491 contacts →
	Exact match “ENTACT is the partner of choice in solving our customer's most complex environmental remediation and geotechnical infrastructure challenges.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
25	Geoengineers INC	Exact match	Redmond, WA, United StatesHQ recorded Oct 13, 2026	201-500	481 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “geological engineering consultants”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 5,078 geological engineering consultants based in the United States

See the full list, filter by size, metro and specialty, and access 61,033 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Geological engineering consultants based in the United States at a glance

As of Oct 13, 2026

48.7%Verified-email coverage

24.7Average contacts per company

11-50Median size (employees)

3.1%Largest-city concentration · Houston

Oct 13, 2026Page data refreshed

Companies by employee count

1-10

2,295

11-50

1,959

51-200

659

201-500

100

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 5,078 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United States whose business descriptions match “geological engineering consultants” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 61,033 professional contacts with verified work emails across the full matched dataset. 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 October 13, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Geological engineering consultants by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “geological engineering consultants”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many geological engineering consultants are there based in the United States?

RevenueBase identified 5,078 company matches for geological engineering consultants associated with the United States as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Terracon tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most geological engineering consultants?

Houston leads with 155 company records, followed by New York (61) and Denver (48).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 61,033 professional contacts with verified work emails tracked across these 5,078 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 13, 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 SmartSearch, 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.