Company lists · Data refreshed September 2026

Top 25 Earthquake engineering firms based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 1,877 companies tracked

RevenueBase identified 1,877 earthquake engineering firms headquartered in the United States as of September 2026 and tracks 35,622 professional contacts across them, including 17,605 with verified work emails. Houston is the largest hub.

This list covers earthquake engineering firms 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 16, 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 16, 2026 86% judged on-target in blind review

1,877Companies

35,622Contacts tracked

17,605Verified emails

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The 25 largest earthquake engineering firms based in the United States

Ranked by team size

Top 25 of 1,877 earthquake engineering firms based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to earthquake engineering 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	Terracon	Partial evidence	Olathe, KS, United StatesHQ checked Sep 16, 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 16, 2026
2	ECS Group Of Companies	Partial evidence	Chantilly, VA, United StatesHQ checked Sep 16, 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 16, 2026
3	Schnabel Engineering	Indirect evidence	Glen Allen, VA, United StatesHQ checked Sep 16, 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 16, 2026
4	Raba Kistner, INC	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 16, 2026	501-1,000	582 contacts →
	Indirect evidence “Founded in 1968, Raba Kistner Inc.” Source: RevenueBase Database · checked Sep 16, 2026
5	Geoengineers INC	Indirect evidence	Redmond, WA, United StatesHQ checked Sep 16, 2026	201-500	479 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026
6	Collins Engineers, INC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 16, 2026	201-500	432 contacts →
	Indirect evidence “In 1979, Collins Engineers, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
7	Degenkolb Engineers	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 16, 2026	201-500	332 contacts →
	Indirect evidence “Founded in 1940, Degenkolb Engineers’ practice reflects more than eight decades of commitment to expertise, client service, and life-long learning.” Source: RevenueBase Database · checked Sep 16, 2026
8	Ardaman & Associates	Indirect evidence	Orlando, FL, United StatesHQ checked Sep 16, 2026	201-500	311 contacts →
	Indirect evidence “Ardaman & Associates, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
9	Hillis-Carnes Engineering Associates, INC	Partial evidence	Annapolis Junction, MD, United StatesHQ checked Sep 16, 2026	201-500	299 contacts →
	Partial evidence “Hillis-Carnes Engineering Associates, Inc.(HCEA) is a Mid-Atlantic based, multi-disciplined consulting engineering firm.” Source: RevenueBase Database · checked Sep 16, 2026
10	ENGEO	Indirect evidence	San Ramon, CA, United StatesHQ checked Sep 16, 2026	201-500	282 contacts →
	Indirect evidence “ENGEO Incorporated is an award-winning, employee-owned comprehensive provider of more than 400 geotechnical and civil engineers, geologists, GIS experts, environmental scientists…” Source: RevenueBase Database · checked Sep 16, 2026
11	Ag&e	Partial evidence	Dallas, TX, United StatesHQ checked Sep 16, 2026	201-500	280 contacts →
	Partial evidence “AG & E is the nation's largest structural engineering firm focused on data centers.” Source: RevenueBase Database · checked Sep 16, 2026
12	Jva, INC	Partial evidence	Boulder, CO, United StatesHQ checked Sep 16, 2026	51-200	258 contacts →
	Partial evidence “JVA, Incorporated is an employee-owned consulting engineering firm with offices in Boulder, Fort Collins, Winter Park, Glenwood Springs, and Denver, Colorado.” Source: RevenueBase Database · checked Sep 16, 2026
13	Modjeski And Masters	Indirect evidence	Mechanicsburg, PA, United StatesHQ checked Sep 16, 2026	201-500	241 contacts →
	Indirect evidence “Modjeski and Masters is a nationwide leader in the design, inspection, and rehabilitation of all bridges types, including long-span and movable structures.” Source: RevenueBase Database · checked Sep 16, 2026
14	Computers And Structures, INC	Strong evidence	Walnut Creek, CA, United StatesHQ checked Sep 16, 2026	51-200	218 contacts →
	Strong evidence “Founded in 1975, Computers and Structures, Inc.(CSI) is recognized globally as the pioneering leader in software tools for structural and earthquake engineering.” Source: RevenueBase Database · checked Sep 16, 2026
15	Geotek	Partial evidence	Las Vegas, NV, United StatesHQ checked Sep 16, 2026	201-500	215 contacts →
	Partial evidence “Incorporated in 1997, GeoTek is a full service consulting engineering firm specializing in geotechnical engineering, construction materials testing, special inspection, and…” Source: RevenueBase Database · checked Sep 16, 2026
16	Geocon	Partial evidence	San Diego, CA, United StatesHQ checked Sep 16, 2026	201-500	197 contacts →
	Partial evidence “Geocon is a California corporation established in 1971 as a professional engineering consulting firm providing comprehensive geotechnical engineering, geotechnical…” Source: RevenueBase Database · checked Sep 16, 2026
17	Magnusson Klemencic Associates	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 16, 2026	51-200	190 contacts →
	Indirect evidence “We engineer the future of the built environment, one structure, skyline, and community at a time.” Source: RevenueBase Database · checked Sep 16, 2026
18	CTL Thompson	Partial evidence	Denver, CO, United StatesHQ checked Sep 16, 2026	201-500	189 contacts →
	Partial evidence “CTL\|Thompson (CTL\|T) has been providing innovative engineering solutions throughout Colorado since 1971.” Source: RevenueBase Database · checked Sep 16, 2026
19	Miyamoto International	Partial evidence	West Sacramento, CA, United StatesHQ checked Sep 16, 2026	201-500	181 contacts →
	Partial evidence “We are a global engineering and disaster management firm providing expert solutions to sustain industries and safeguard communities.” Source: RevenueBase Database · checked Sep 16, 2026
20	SCI Engineering, INC	Partial evidence	St. Charles, MO, United StatesHQ checked Sep 16, 2026	51-200	174 contacts →
	Partial evidence “SCI Engineering, Inc.(SCI) is a nationwide, multi-discipline professional consulting engineering firm that provides comprehensive services across all phases of project development…” Source: RevenueBase Database · checked Sep 16, 2026
21	Lera Consulting Structural Engineers	Partial evidence	New York, NY, United StatesHQ checked Sep 16, 2026	51-200	172 contacts →
	Partial evidence “LERA Consulting Structural Engineers (LERA) is a M/WBE structural engineering firm providing services to architects, owners, contractors, and developers.” Source: RevenueBase Database · checked Sep 16, 2026
22	Certerra RMA Group	Partial evidence	Rancho Cucamonga, CA, United StatesHQ checked Sep 16, 2026	201-500	172 contacts →
	Partial evidence “Certerra RMA Group is a client-centered geotechnical engineering and materials testing consulting firm with office and laboratory facilities located throughout California and Las…” Source: RevenueBase Database · checked Sep 16, 2026
23	Rizzo International	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 16, 2026	51-200	165 contacts →
	Partial evidence “RIZZO International, Inc.(RIZZO) is a global engineering and consulting firm headquartered in Pittsburgh, Pennsylvania US.” Source: RevenueBase Database · checked Sep 16, 2026
24	Rocksol Consulting Group, INC	Partial evidence	Thornton, CO, United StatesHQ checked Sep 16, 2026	201-500	161 contacts →
	Partial evidence “Since 1996, RockSol has earned an outstanding reputation for engineering excellence, customer service, and quality assurance.” Source: RevenueBase Database · checked Sep 16, 2026
25	Building & Earth	Partial evidence	Birmingham, AL, United StatesHQ checked Sep 16, 2026	201-500	161 contacts →
	Partial evidence “Building & Earth is a professional engineering firm, specializing in geotechnical engineering, construction materials testing, special inspections per I.B.C./I.C.C.” Source: RevenueBase Database · checked Sep 16, 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: earthquake engineering 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 earthquake engineering firms.
Partial evidence: Its own public description names part of earthquake engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name earthquake engineering 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 1,877 earthquake engineering firms based in the United States

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Earthquake engineering firms based in the United States at a glance

As of Sep 16, 2026

49.4%Verified-email coverage

19.0Average contacts per company

1-10Median size (employees)

2.1%Largest-city concentration · Houston

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

1,058

11-50

631

51-200

152

201-500

501-1,000

1,001-5,000

5,001-10,000

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 1,877 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 earthquake engineering 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 the United States whose own description of what they do matches “earthquake engineering 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 earthquake engineering 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 earthquake engineering firms, 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, 17,605 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 16, 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.

Earthquake engineering firms 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 earthquake engineering 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 earthquake engineering firms are there based in the United States?

RevenueBase identified 1,877 earthquake engineering firms 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 earthquake engineering firms?

Houston leads with 40 headquartered companies, followed by New York (37) and San Francisco (36).

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 17,605 verified decision-maker contacts tracked across these 1,877 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 16, 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.