Company lists · Data refreshed September 2026

Top 25 Environmental engineering construction firms based in Los Angeles, United States

Name: Environmental engineering construction firms based in Los Angeles, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 57 companies tracked

RevenueBase identified 57 environmental engineering construction firms headquartered in Los Angeles, United States as of September 2026 and tracks 1,695 professional contacts across them, including 979 with verified work emails. Houston is the largest hub.

This list covers environmental engineering construction firms headquartered in Los Angeles, 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

57Companies

1,695Contacts tracked

979Verified emails

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The 25 largest environmental engineering construction firms based in Los Angeles, United States

Ranked by team size

Top 25 of 57 environmental engineering construction firms based in Los Angeles, United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to environmental engineering construction 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	Psomas	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	501-1,000	748 contacts →
	Indirect evidence “Our award-winning projects are produced through innovation, creativity, and technical expertise.” Source: RevenueBase Database · checked Sep 16, 2026
2	Cordoba Corporation	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	501-1,000	516 contacts →
	Strong evidence “CORDOBA CORPORATION is a California engineering, construction management, program management, and planning firm specializing in transportation, water, energy, education and…” Source: RevenueBase Database · checked Sep 16, 2026
3	Brandow & Johnston	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	53 contacts →
	Indirect evidence “Our firm is proud to be identified among those who built the Los Angeles we see today.” Source: RevenueBase Database · checked Sep 16, 2026
4	SEA PAC Engineering, INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	51-200	51 contacts →
	Partial evidence “SEA PAC ENGINEERING, INC is a company based out of Los Angeles, California, United States.” Source: RevenueBase Database · checked Sep 16, 2026
5	Torres Construction Corporation	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	51-200	32 contacts →
	Partial evidence “Torres Construction is an award winning Contractor with a wide range of experience in both commercial and industrial construction.” Source: RevenueBase Database · checked Sep 16, 2026
6	Terra-Petra	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	26 contacts →
	Partial evidence “Environmental Division - Terra-Petra possess more than 80 years of collective experience in the environmental and soil gas mitigation fields.” Source: RevenueBase Database · checked Sep 16, 2026
7	Watearth	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	22 contacts →
	Indirect evidence “Watearth, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
8	Impact Sciences	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	18 contacts →
	Indirect evidence “Informing communities and creating a clear path to understanding are at the core of what we do at Impact Sciences.” Source: RevenueBase Database · checked Sep 16, 2026
9	The Alliance Group Consulting	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	1-10	16 contacts →
	Partial evidence “The Alliance Group Consulting (TAGC) is a California based transportation engineering firm which is located in Los Angeles and is certified as a SBE/VSBE/DBE/MBE/DGS firm.” Source: RevenueBase Database · checked Sep 16, 2026
10	BA INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	15 contacts →
	Partial evidence “BA Inc.(DBE/MBE/SBE) has been in business for 11 years; established and incorporated in 2004 to provide professional engineering design services to public agencies for public…” Source: RevenueBase Database · checked Sep 16, 2026
11	Analysis & Solutions Consultants	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	14 contacts →
	Partial evidence “Analysis & Solutions Consultants (ASC) plays a key role in the design and construction of many challenging projects.” Source: RevenueBase Database · checked Sep 16, 2026
12	C2pm	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	14 contacts →
	Strong evidence “C2PM stands at the forefront of the construction consulting landscape, offering a full spectrum of program management, construction management, and specialized engineering…” Source: RevenueBase Database · checked Sep 16, 2026
13	Melqart Inc. Structural Engineering	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	11 contacts →
	Indirect evidence “Melqart, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
14	D R Consultants & Designers, INC	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	10 contacts →
	Strong evidence “DRC, a public works engineering firm, in business for 40 years, provides expert level Transportation; Water/Wastewater engineering and Construction Management services to repeat…” Source: RevenueBase Database · checked Sep 16, 2026
15	Peter T. Erdelyi & Assoc. Inc.	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	9 contacts →
	Indirect evidence “Whether you're upgrading an existing structure or building from the ground up, Peter T.” Source: RevenueBase Database · checked Sep 16, 2026
16	EPD Consultants, INC	Indirect evidence	Los Angeles, United StatesHQ checked Sep 16, 2026	1-10	9 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026
17	Kroner Environmental Services	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	8 contacts →
	Strong evidence “Kroner Environmental Services is a full service environmental engineering and consulting company headquartered in Los Angeles but with ongoing operations nationwide.” Source: RevenueBase Database · checked Sep 16, 2026
18	Parthenon Corporation	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	8 contacts →
	Strong evidence “Parthenon Corporation is a leading provider of consulting, engineering, and construction services worldwide.” Source: RevenueBase Database · checked Sep 16, 2026
19	Goldenline Construction	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	7 contacts →
	Indirect evidence “We aim to improve business by delivering effective solutions based on innovative technologies and clean designs.” Source: RevenueBase Database · checked Sep 16, 2026
20	Khalifeh & Associates Inc, Consulting Engineers	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	6 contacts →
	Partial evidence “Khalifeh & Associates Inc, Consulting Engineers is a mechanical or industrial engineering company based out of 1625 W.” Source: RevenueBase Database · checked Sep 16, 2026
21	Biayna Engineering & Construction	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	1-10	6 contacts →
	Strong evidence “Civil Engineering, Structural Engineering, Construction Seismic Structural Retrofitting - Soft Story, URM, Non-Ductile Real Estate, Design Build, Foundation Design…” Source: RevenueBase Database · checked Sep 16, 2026
22	ZILA	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	6 contacts →
	Partial evidence “Zila, is a Stormwater Management & Civil Engineering Co, which provides stormwater management and civil engineering related services including stormwater pollution prevention plan…” Source: RevenueBase Database · checked Sep 16, 2026
23	Steiner Consulting INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	1-10	5 contacts →
	Partial evidence “Steiner Consulting, Inc.(SCI) is a heavy civil-engineering consulting firm specializing in driving Southern California infrastructure.” Source: RevenueBase Database · checked Sep 16, 2026
24	Andersen Integrated Services	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	4 contacts →
	Strong evidence “Andersen Integrated Services, Inc.(Andersen) is a full service consulting firm specializing in Forensic Engineering, Environmental, and Specialty Consulting Services.” Source: RevenueBase Database · checked Sep 16, 2026
25	Suenram & Associates, INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 16, 2026	11-50	4 contacts →
	Partial evidence “Suenram & Associates, Inc.(SAI) is a Los Angeles-based certified small business enterprise providing civil engineering design and consulting services for public agencies and…” 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: environmental engineering construction 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 environmental engineering construction firms.
Partial evidence: Its own public description names part of environmental engineering construction firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental engineering construction 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 57 environmental engineering construction firms based in Los Angeles, United States

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Environmental engineering construction firms based in Los Angeles, United States at a glance

As of Sep 16, 2026

57.8%Verified-email coverage

29.7Average contacts per company

11-50Median size (employees)

336.8%Largest-city concentration · Houston

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Los Angeles, so it is reported there. Company counts and contact totals on this page are exact for Los Angeles, over 57 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 environmental engineering construction 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 Los Angeles, United States whose own description of what they do matches “environmental engineering construction 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 environmental engineering construction 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 environmental engineering construction firms, and records with no verified work email. Companies headquartered outside Los Angeles 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, 979 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.

Environmental engineering construction 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 environmental engineering construction 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 environmental engineering construction firms are there based in Los Angeles, United States?

RevenueBase identified 57 environmental engineering construction firms headquartered in Los Angeles, 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?

Psomas, headquartered in Los Angeles, tops this list with the largest team on record.

Which city has the most environmental engineering construction firms?

Houston leads with 192 headquartered companies, followed by New York (134) and Miami (87).

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 979 verified decision-maker contacts tracked across these 57 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.