Company lists · Data refreshed September 2026

Top 25 Environmental engineering firms worldwide

Name: Environmental engineering firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 20,124 companies tracked

RevenueBase identified 20,124 environmental engineering firms worldwide as of September 2026 and tracks 568,432 professional contacts across them, including 230,444 with verified work emails and 0 with mobile numbers. The United States is the largest market and Sao Paulo the largest hub.

This list covers environmental engineering firms worldwide, 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. Country and city lists for environmental engineering firms follow the table.

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

20,124Companies

568,432Contacts tracked

230,444Verified emails

0Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest environmental engineering firms worldwide

Ranked by team size

Top 25 of 20,124 environmental engineering firms worldwide, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to environmental 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	Stantec	Indirect evidence	Edmonton, AB, CanadaHQ checked Sep 16, 2026	10001+	28,416 contacts →
	Indirect evidence “Stantec empowers clients, people, and communities to rise to the world’s greatest challenges at a time when the world faces more unprecedented concerns than ever before.” Source: RevenueBase Database · checked Sep 16, 2026
2	Tetra Tech	Strong evidence	Pasadena, CA, United StatesHQ checked Sep 16, 2026	10001+	12,999 contacts →
	Strong 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 16, 2026
3	WSP In The U.S	Partial evidence	New York, NY, United StatesHQ checked Sep 16, 2026	10001+	9,318 contacts →
	Partial evidence “What if you could shape built and natural environments – and the future of those that use them?” Source: RevenueBase Database · checked Sep 16, 2026
4	Clean Harbors	Partial evidence	Norwell, MA, United StatesHQ checked Sep 16, 2026	10001+	8,924 contacts →
	Partial evidence “Clean Harbors is North America’s leading provider of environmental and industrial services.” Source: RevenueBase Database · checked Sep 16, 2026
5	CDM Smith	Partial evidence	Boston, MA, United StatesHQ checked Sep 16, 2026	5,001-10,000	7,527 contacts →
	Partial evidence “CDM Smith is shaping what’s next, now, with world class solutions in water, environment, transportation and energy to public and private clients worldwide.” Source: RevenueBase Database · checked Sep 16, 2026
6	COWI	Indirect evidence	Lyngby, DenmarkHQ checked Sep 16, 2026	5,001-10,000	7,438 contacts →
	Indirect evidence “Together with customers, partners and colleagues, we shape a future where people and societies grow and flourish.” Source: RevenueBase Database · checked Sep 16, 2026
7	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
8	Michael Baker International	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 16, 2026	5,001-10,000	4,362 contacts →
	Partial evidence “Michael Baker International is a leading provider of engineering, consulting, and technology services spanning four Verticals: Infrastructure, Places and Facilities, Federal and…” Source: RevenueBase Database · checked Sep 16, 2026
9	ION Exchange India LTD	Partial evidence	Mumbai, IndiaHQ checked Sep 16, 2026	1,001-5,000	3,810 contacts →
	Partial evidence “At Ion Exchange India, we bring you total environment solutions - water treatment, liquid waste treatment & recycle, air pollution control, solid & hazardous waste management and…” Source: RevenueBase Database · checked Sep 16, 2026
10	National Engineering Services Pakistan PVT Limited Nespak	Indirect evidence	Lahore, PakistanHQ checked Sep 16, 2026	5,001-10,000	3,266 contacts →
	Indirect evidence “NESPAK is Pakistan’s premier consultancy organization (established in 1973).” Source: RevenueBase Database · checked Sep 16, 2026
11	Golder	Indirect evidence	Vancouver, BC, CanadaHQ checked Sep 16, 2026	5,001-10,000	3,167 contacts →
	Indirect evidence “Golder was acquired by WSP.” Source: RevenueBase Database · checked Sep 16, 2026
12	NIRAS	Indirect evidence	Allerød, DenmarkHQ checked Sep 16, 2026	1,001-5,000	2,699 contacts →
	Indirect evidence “At NIRAS, we engineer solutions for a shared future.” Source: RevenueBase Database · checked Sep 16, 2026
13	APTIM	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,639 contacts →
	Partial evidence “APTIM enhances the quality of the environment, wellbeing of people, resilience of communities, and opportunity for employees to make a difference, not just a living.” Source: RevenueBase Database · checked Sep 16, 2026
14	Multiconsult	Indirect evidence	Oslo, NorwayHQ checked Sep 16, 2026	1,001-5,000	2,553 contacts →
	Indirect evidence “Multiconsult Norway is one of the leading firms of architectures, consulting engineers and designers in Norway.” Source: RevenueBase Database · checked Sep 16, 2026
15	Brown And Caldwell	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,473 contacts →
	Indirect evidence “Headquartered in Walnut Creek, Calif, Brown and Caldwell is an employee-owned firm with 2,100+ professionals serving clients locally and globally from 52 locations.” Source: RevenueBase Database · checked Sep 16, 2026
16	Geosyntec Consultants	Strong evidence	Boca Raton, FL, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,393 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 16, 2026
17	Providence	Strong evidence	Baton Rouge, LA, United StatesHQ checked Sep 16, 2026	n/a	2,232 contacts →
	Strong evidence “Providence is an employee-owned engineering and environmental consulting firm.” Source: RevenueBase Database · checked Sep 16, 2026
18	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
19	KCI	Partial evidence	Sparks, NC, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,207 contacts →
	Partial evidence “KCI is a 100-percent employee-owned engineering, consulting and construction firm serving clients throughout the United States and beyond.” Source: RevenueBase Database · checked Sep 16, 2026
20	Langan Engineering & Environmental Services	Partial evidence	Parsippany, NJ, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,177 contacts →
	Partial evidence “Langan's client-focused, highly entrepreneurial culture cultivates an environment of opportunities in which career growth and teamwork flourish.” Source: RevenueBase Database · checked Sep 16, 2026
21	Civil & Environmental Consultants, INC	Partial evidence	Moon Township, PA, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,145 contacts →
	Partial evidence “Civil & Environmental Consultants, Inc.(CEC) provides comprehensive market-oriented consulting services that advance the strategic business objectives of its clients.” Source: RevenueBase Database · checked Sep 16, 2026
22	Olsson	Partial evidence	Lincoln, NE, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,108 contacts →
	Partial evidence “Olsson is an engineering firm made up of people who craft expert solutions and designs that improve communities.” Source: RevenueBase Database · checked Sep 16, 2026
23	Hazen And Sawyer	Indirect evidence	New York, NY, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,100 contacts →
	Indirect evidence “As Hazen marks 75 years, we celebrate a legacy of absolute commitment to our clients while delivering the best technical work available anywhere.” Source: RevenueBase Database · checked Sep 16, 2026
24	IMEG	Partial evidence	Rock Island, IL, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,985 contacts →
	Partial evidence “Leaders in Engineering and Innovation.” Source: RevenueBase Database · checked Sep 16, 2026
25	LJA	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,932 contacts →
	Indirect evidence “Employee-Owned.” 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 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 firms.
Partial evidence: Its own public description names part of environmental engineering 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 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 20,124 environmental engineering firms worldwide

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 230,444 reachable decision-makers.

Free signup · no credit card

View the full list →

Environmental engineering firms worldwide at a glance

As of Sep 16, 2026

40.5%Verified-email coverage

28.2Average contacts per company

11-50Median size (employees)

1.4%Largest-city concentration · Sao Paulo

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

9,954

11-50

6,962

51-200

2,180

201-500

562

501-1,000

164

1,001-5,000

151

5,001-10,000

10001+

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 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.
Coverage: 45 countries, largest first: the United States, Brazil, Canada, Italy, Germany, France, India, Spain, Australia, the United Kingdom and 35 more. Country and city lists for environmental engineering firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “environmental 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 environmental 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 environmental engineering firms, and records with no verified work email.
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, 230,444 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 firms by location

105 lists · largest first

Every Environmental engineering firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 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 firms are there worldwide?

RevenueBase identified 20,124 environmental engineering firms worldwide 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?

Stantec, headquartered in Edmonton, tops this list with the largest team on record.

Which country has the most environmental engineering firms?

The United States leads with 6,932 companies, followed by Brazil (2,525) and Canada (1,023). Every environmental engineering firms list by country and city is linked on this page.

Which city has the most environmental engineering firms?

Sao Paulo leads with 278 headquartered companies, followed by Belo Horizonte (144) and Houston (138).

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 230,444 verified decision-maker contacts tracked across these 20,124 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.

Ready to reach these companies? Verified emails and direct dials for all 20,124 environmental engineering firms worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.