Company lists · Data refreshed October 2026

Top 25 Conservation engineering firms based in the United States

Name: Conservation 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 Oct 10, 2026 6,650 companies tracked

RevenueBase identified 6,650 company matches for conservation engineering firms associated with the United States as of October 2026 and tracks 415,975 professional contacts across them, including 188,712 with verified work emails. Houston is the largest hub.

This list covers company matches for conservation engineering firms 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 10, 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 10, 2026 How this list was built

6,650Companies

415,975Contacts tracked

188,712Verified emails

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The 25 largest conservation engineering firms based in the United States

Ranked by team size

Top 25 of 6,650 company matches for conservation engineering firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 10, 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	AECOM	Exact match	Dallas, TX, United StatesHQ recorded Oct 10, 2026	10001+	65,956 contacts →
	Exact match “AECOM is the global infrastructure leader, committed to delivering a better world.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
2	Tetra Tech	Exact match	Pasadena, CA, United StatesHQ recorded Oct 10, 2026	10001+	13,725 contacts →
	Exact match “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
3	WSP In The U.S	Exact match	New York, NY, United StatesHQ recorded Oct 10, 2026	10001+	10,184 contacts →
	Exact match “What if you could shape built and natural environments – and the future of those that use them?” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
4	Ch2m	Exact match	Englewood, CO, United StatesHQ recorded Oct 10, 2026	10001+	8,279 contacts →
	Exact match “CH2M is now Jacobs.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
5	CDM Smith	Exact match	Boston, MA, United StatesHQ recorded Oct 10, 2026	5,001-10,000	7,832 contacts →
	Exact match “CDM Smith is shaping what’s next, now, with world class solutions in water, environment, transportation and energy to public and private clients worldwide.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
6	TRC Companies, INC	Exact match	Windsor, CT, United StatesHQ recorded Oct 10, 2026	5,001-10,000	7,140 contacts →
	Exact match “TRC, a member of WSP, stands for adaptability.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
7	Terracon	Exact match	Olathe, KS, United StatesHQ recorded Oct 10, 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 10, 2026 · View company records in RevenueBase
8	Michael Baker International	Exact match	Pittsburgh, PA, United StatesHQ recorded Oct 10, 2026	5,001-10,000	4,415 contacts →
	Exact match “Michael Baker International is a leading provider of engineering, consulting, and technology services spanning four Verticals: Infrastructure, Places and Facilities, Federal and…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
9	STV	Exact match	New York, NY, United StatesHQ recorded Oct 10, 2026	1,001-5,000	3,752 contacts →
	Exact match “Follow STV for practical insight into the infrastructure, ideas and people making communities better.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
10	Dewberry	Exact match	Fairfax, VA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,918 contacts →
	Exact match “Dewberry is a leading, market-facing firm with a proven history of providing professional services to a wide variety of public- and private-sector clients.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
11	APTIM	Exact match	Baton Rouge, LA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,692 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
12	Geosyntec Consultants	Exact match	Boca Raton, FL, United StatesHQ recorded Oct 10, 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 10, 2026 · View company records in RevenueBase
13	Brown And Caldwell	Exact match	Walnut Creek, CA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,510 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
14	Langan Engineering & Environmental Services	Exact match	Parsippany, NJ, United StatesHQ recorded Oct 10, 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 10, 2026 · View company records in RevenueBase
15	VHB	Exact match	Watertown, MA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,379 contacts →
	Exact match “We are VHB.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
16	ECS Group Of Companies	Exact match	Chantilly, VA, United StatesHQ recorded Oct 10, 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 10, 2026 · View company records in RevenueBase
17	Providence	Exact match	Baton Rouge, LA, United StatesHQ recorded Oct 10, 2026	n/a	2,256 contacts →
	Exact match “Providence is an employee-owned engineering and environmental consulting firm.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
18	Hazen And Sawyer	Exact match	New York, NY, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,251 contacts →
	Exact match “As Hazen marks 75 years, we celebrate a legacy of absolute commitment to our clients while delivering the best technical work available anywhere.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
19	Olsson	Exact match	Lincoln, NE, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,229 contacts →
	Exact match “Olsson is an engineering firm made up of people who craft expert solutions and designs that improve communities.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
20	Civil & Environmental Consultants, INC	Exact match	Moon Township, PA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,204 contacts →
	Exact match “Civil & Environmental Consultants, Inc.(CEC) provides comprehensive market-oriented consulting services that advance the strategic business objectives of its clients.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
21	LJA	Exact match	Houston, TX, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,148 contacts →
	Exact match “Employee-Owned.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
22	Colliers Engineering & Design	Exact match	Holmdel, NJ, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,103 contacts →
	Exact match “Colliers Engineering & Design, an affiliate of Colliers, is a trusted provider of multi-discipline engineering and architecture, design and consulting services to public and…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
23	IMEG	Exact match	Rock Island, IL, United StatesHQ recorded Oct 10, 2026	1,001-5,000	2,064 contacts →
	Exact match “Leaders in Engineering and Innovation.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
24	KCI Technologies, INC	Exact match	Sparks, MD, United StatesHQ recorded Oct 10, 2026	1,001-5,000	1,851 contacts →
	Exact match “KCI is a 100-percent employee-owned engineering, consulting and construction firm serving clients throughout the United States and beyond.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
25	Carollo Engineers	Exact match	Walnut Creek, CA, United StatesHQ recorded Oct 10, 2026	1,001-5,000	1,811 contacts →
	Exact match “For more than 90 years, Carollo Engineers has been dedicated exclusively to water and wastewater solutions.” Recorded in the RevenueBase company graph · Oct 10, 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 “conservation engineering firms”. 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 6,650 conservation engineering firms based in the United States

See the full list, filter by size, metro and specialty, and access 188,712 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Conservation engineering firms based in the United States at a glance

As of Oct 10, 2026

45.4%Verified-email coverage

62.6Average contacts per company

11-50Median size (employees)

2.0%Largest-city concentration · Houston

Oct 10, 2026Page data refreshed

Companies by employee count

1-10

2,863

11-50

2,458

51-200

913

201-500

215

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 6,650 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 “conservation engineering firms” 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 188,712 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 10, 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.

Conservation engineering firms 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 “conservation engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many conservation engineering firms are there based in the United States?

RevenueBase identified 6,650 company matches for conservation engineering firms 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?

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

Which city has the most conservation engineering firms?

Houston leads with 132 company records, followed by New York (82) and Austin (75).

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 188,712 professional contacts with verified work emails tracked across these 6,650 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 10, 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.