Company lists · Data refreshed September 2026

Top 25 Engineering consultancy firms based in Pasadena, United States

Name: Engineering consultancy firms based in Pasadena, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 48 companies tracked

RevenueBase identified 48 engineering consultancy firms headquartered in Pasadena, United States as of September 2026 and tracks 13,613 professional contacts across them, including 5,683 with verified work emails. Across the United States, Houston is the largest hub for this category (537 companies); Pasadena has 48.

This list covers engineering consultancy firms headquartered in Pasadena, 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 27, 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 27, 2026 86% judged on-target in blind review

48Companies

13,613Contacts tracked

5,683Verified emails

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The 25 largest engineering consultancy firms based in Pasadena, United States

Ranked by team size

Top 25 of 48 engineering consultancy firms based in Pasadena, United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to engineering consultancy 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	Tetra Tech	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	10001+	12,999 contacts →
	Partial evidence “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Source: RevenueBase Database · checked Sep 27, 2026
2	HSA & Associates, INC	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	51-200	75 contacts →
	Partial evidence “HSA & Associates provides structural engineering services to a myriad of partners in tilt-up construction and beyond.” Source: RevenueBase Database · checked Sep 27, 2026
3	Tier 1 Integrity	Partial evidence	Pasadena, TX, United StatesHQ checked Sep 27, 2026	51-200	60 contacts →
	Partial evidence “Tier 1 Integrity LLC (T1 Integrity) is a multi-disciplinary engineering consulting; asset integrity management (AIM); technical inspection; traditional and advanced nondestructive…” Source: RevenueBase Database · checked Sep 27, 2026
4	Citadel Cpm, INC	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	51-200	52 contacts →
	Indirect evidence “Citadel CPM, Inc.(Citadel) is a California corporation, headquartered in Los Angeles County, that was established in 2006 to provide professional construction project management…” Source: RevenueBase Database · checked Sep 27, 2026
5	Pacifica Services, INC	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	51-200	49 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026
6	Ramos Consulting Services, Inc. Ramos CS	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	51-200	48 contacts →
	Partial evidence “Founded in Los Angeles, CA, Ramos Consulting Services, Inc.(Ramos CS) is an engineering and program/construction management company focused on delivering quality infrastructure…” Source: RevenueBase Database · checked Sep 27, 2026
7	Pacrim Engineering	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	11-50	45 contacts →
	Partial evidence “PacRim Engineering is a leading engineering consulting firm that offers its clients exceptional, innovative, professional engineering consulting services.” Source: RevenueBase Database · checked Sep 27, 2026
8	SWA Architects Pasadena, CA	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	11-50	36 contacts →
	Indirect evidence “SWA Architects (SWA), a certified Minority Business Enterprise (MBE) and Small Business Enterprise (SBE), was established in 1985 to provide architectural design, planning, and…” Source: RevenueBase Database · checked Sep 27, 2026
9	Fiedler Group	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	11-50	23 contacts →
	Partial evidence “Founded in 1957, Fiedler Group is widely considered the authority in innovative architectural, design, and engineering services.” Source: RevenueBase Database · checked Sep 27, 2026
10	AIX Group	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	1-10	21 contacts →
	Partial evidence “Results-oriented, talented and innovative professionals that provide client focused, sustainable and equitable engineering and construction management services” Source: RevenueBase Database · checked Sep 27, 2026
11	ZT Consulting Group, INC	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	11-50	19 contacts →
	Partial evidence “ZT Consulting Group, Inc.(ZTC) is a consulting engineering company that is specialized in Source Inspection (QA/QV/IQA), Forensic Engineering, and Structural Health Monitoring…” Source: RevenueBase Database · checked Sep 27, 2026
12	MA Engineering	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	11-50	16 contacts →
	Partial evidence “MA Engineering is a Civil Engineering firm based in Pasadena, California, with a staff of 24 designers and engineers.” Source: RevenueBase Database · checked Sep 27, 2026
13	J. Morales Civil Engineering	Partial evidence	Pasadena, TX, United StatesHQ checked Sep 27, 2026	11-50	14 contacts →
	Partial evidence “We are a one-stop civil engineering firm serving the Houston area.” Source: RevenueBase Database · checked Sep 27, 2026
14	Adams Environmental Engineering Group, LLC	Indirect evidence	Pasadena, MD, United StatesHQ checked Sep 27, 2026	1-10	8 contacts →
	Indirect evidence “AEEG, LLC was formed in 2018 to service the Baltimore-Washington Metro area by combining technical experience and skilled workmanship, resulting in accurate work plan…” Source: RevenueBase Database · checked Sep 27, 2026
15	Hariton Engineering INC	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	1-10	6 contacts →
	Indirect evidence “Sustainability: When it comes to caring for our environment, one of the primary concerns is how we treat and sustain it.” Source: RevenueBase Database · checked Sep 27, 2026
16	Peck Architecture Structural Civil	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	11-50	6 contacts →
	Partial evidence “At PECK we provide architecture & engineering design solutions for residential and commercial clients in Southern California / Los Angeles, We believe in producing solutions that…” Source: RevenueBase Database · checked Sep 27, 2026
17	DHA Calpec	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	11-50	5 contacts →
	Partial evidence “d’Autremont-Helms & Associates, Inc.(dHA) was founded in 1949 as an engineering firm offering expertise in the area of Mechanical and Plumbing consulting engineering services.” Source: RevenueBase Database · checked Sep 27, 2026
18	Irvine Geotechnical, INC	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	1-10	4 contacts →
	Partial evidence “We provide consulting services in geotechnical engineering and engineering geology.” Source: RevenueBase Database · checked Sep 27, 2026
19	GEO Forward	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	1-10	4 contacts →
	Indirect evidence “Environmental Science & Technology” Source: RevenueBase Database · checked Sep 27, 2026
20	JCE Structural Engineering Group	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	11-50	4 contacts →
	Partial evidence “JCE Structural Engineering Group, Inc.” Source: RevenueBase Database · checked Sep 27, 2026
21	Larsen Zienkiewicz, INC	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	1-10	3 contacts →
	Indirect evidence “Engineers and expert advisors on building enclosures and waterproofing systems in the construction industry.” Source: RevenueBase Database · checked Sep 27, 2026
22	Engineous Group, INC	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	11-50	3 contacts →
	Indirect evidence “Engineous Group Inc.” Source: RevenueBase Database · checked Sep 27, 2026
23	Ibarra Structural Engineering	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	1-10	2 contacts →
	Partial evidence “ibarra Structural Engineering specializes in serving architects in residential and commercial construction projects in the greater Los Angeles area.” Source: RevenueBase Database · checked Sep 27, 2026
24	XIA Structural Engineers, INC	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	1-10	2 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026
25	Wyatt Engineering	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	1-10	1 contacts →
	Partial evidence “Wyatt Engineering is a structural and architectural engineering firm based in Pasadena, California and Oakland, California.” Source: RevenueBase Database · checked Sep 27, 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: engineering consultancy 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 engineering consultancy firms.
Partial evidence: Its own public description names part of engineering consultancy firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name engineering consultancy 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 48 engineering consultancy firms based in Pasadena, United States

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Engineering consultancy firms based in Pasadena, United States at a glance

As of Sep 27, 2026

41.7%Verified-email coverage

283.6Average contacts per company

11-50Median size (employees)

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

10001+

Email recency for this list is measured across the whole United States list rather than for Pasadena, so it is reported there. Company counts and contact totals on this page are exact for Pasadena, over 48 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 engineering consultancy 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 Pasadena, United States whose own description of what they do matches “engineering consultancy 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 engineering consultancy 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 engineering consultancy firms, and records with no verified work email. Companies headquartered outside Pasadena 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, 5,683 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 27, 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.

Engineering consultancy 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 engineering consultancy 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 engineering consultancy firms are there based in Pasadena, United States?

RevenueBase identified 48 engineering consultancy firms headquartered in Pasadena, 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?

Tetra Tech, headquartered in Pasadena, tops this list with the largest team on record.

Which city in the United States has the most engineering consultancy firms?

Houston leads the United States with 537 headquartered companies, followed by New York (412) and Chicago (189). Pasadena has 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 5,683 verified decision-maker contacts tracked across these 48 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 27, 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.