Company lists · Data refreshed September 2026

Top 25 Mining environmental consulting firms based in the United States

Name: Mining environmental consulting 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 5, 2026 3,037 companies tracked

RevenueBase identified 3,037 mining environmental consulting firms headquartered in the United States as of September 2026 and tracks 83,438 professional contacts across them, including 41,884 with verified work emails and 36,915 with mobile numbers. Houston is the largest hub.

This list covers mining environmental consulting 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 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 HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

3,037Companies

83,438Contacts tracked

41,884Verified emails

36,915Mobile numbers

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The 25 largest mining environmental consulting firms based in the United States

Ranked by team size

Top 25 of 3,037 mining environmental consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names mining environmental consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	TerraconPartial evidence	Olathe, KS, United StatesHQ checked Sep 5, 2026	5,001-10,000	6,113
	“Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Source: company website · checked Sep 5, 2026
2	Geosyntec ConsultantsStrong evidence	Boca Raton, FL, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,393
	“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: company website · checked Sep 5, 2026
3	ECS Group Of CompaniesPartial evidence	Chantilly, VA, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,210
	“ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.” Source: company website · checked Sep 5, 2026
4	Langan Engineering & Environmental ServicesPartial evidence	Parsippany, NJ, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,177
	“Langan's client-focused, highly entrepreneurial culture cultivates an environment of opportunities in which career growth and teamwork flourish.” Source: company website · checked Sep 5, 2026
5	Civil & Environmental Consultants, INCStrong evidence	Moon Township, PA, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,145
	“Civil & Environmental Consultants, Inc.(CEC) provides comprehensive market-oriented consulting services that advance the strategic business objectives of its clients.” Source: company website · checked Sep 5, 2026
6	Swca Environmental ConsultantsStrong evidence	Phoenix, AZ, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,629
	“Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Source: company website · checked Sep 5, 2026
7	Montrose Environmental GroupPartial evidence	Little Rock, AR, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,529
	“Onterris (formerly Montrose Environmental Group) was one of the first to see environmental responsibility as not just an imperative but as a strategic asset.” Source: company website · checked Sep 5, 2026
8	Knight PiesoldStrong evidence	Denver, CO, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,231
	“Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Source: company website · checked Sep 5, 2026
9	VerdantasPartial evidence	Tampa, FL, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,139
	“At Verdantas, we blend engineering and environmental science together with advanced technology and world-renowned labs to create solutions with the big picture in mind.” Source: company website · checked Sep 5, 2026
10	Apex CompaniesIndirect evidence	Rockville, MD, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,137
	“Who is Apex?” Source: company website · checked Sep 5, 2026
11	Barr Engineering COStrong evidence	Minneapolis, MN, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,088
	“Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Source: company website · checked Sep 5, 2026
12	Braun Intertec CorporationPartial evidence	Minneapolis, MN, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,065
	“At Braun Intertec, we work at the intersection of the natural and built environments, combining science, technology, and engineering.” Source: company website · checked Sep 5, 2026
13	Trinity ConsultantsPartial evidence	Dallas, TX, United StatesHQ checked Sep 5, 2026	1,001-5,000	961
	“Trinity Consultants is a global team of experts helping organizations solve complex challenges in environmental compliance, ecological protection, infrastructure performance, and…” Source: company website · checked Sep 5, 2026
14	Alliance Technical GroupPartial evidence	Decatur, AL, United StatesHQ checked Sep 5, 2026	1,001-5,000	956
	“Alliance is a new kind of environmental services company-powered by innovation, focused on service, and committed to client success.” Source: company website · checked Sep 5, 2026
15	ATC Group Services LLCIndirect evidence	Lafayette, LA, United StatesHQ checked Sep 5, 2026	1,001-5,000	865
	“ATC Group Services LLC is now Atlas.” Source: company website · checked Sep 5, 2026
16	DUDEKStrong evidence	Encinitas, CA, United StatesHQ checked Sep 5, 2026	501-1,000	795
	“Dudek is an environmental, planning, and engineering consulting firm.” Source: company website · checked Sep 5, 2026
17	The Foth CompaniesIndirect evidence	De Pere, WI, United StatesHQ checked Sep 5, 2026	501-1,000	781
	“By combining science, engineering, and technology with a true collaborative spirit, Foth has delivered innovative solutions to our clients since 1938.” Source: company website · checked Sep 5, 2026
18	Environmental Science AssociatesStrong evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	501-1,000	732
	“ESA is a 100% employee-owned environmental consulting firm.” Source: company website · checked Sep 5, 2026
19	Antea Group USAStrong evidence	St Paul, MN, United StatesHQ checked Sep 5, 2026	1,001-5,000	658
	“Antea Group is an international engineering and environmental consulting firm specializing in full-service solutions in the fields of environment, health and safety, and…” Source: company website · checked Sep 5, 2026
20	Raba Kistner, INCIndirect evidence	San Antonio, TX, United StatesHQ checked Sep 5, 2026	501-1,000	582
	“Founded in 1968, Raba Kistner Inc.” Source: company website · checked Sep 5, 2026
21	Trihydro CorporationStrong evidence	Laramie, WY, United StatesHQ checked Sep 5, 2026	501-1,000	577
	“Headquartered in Laramie, Wyoming, Trihydro provides environmental consulting, engineering and surveying, air quality and process management, information technology, and water and…” Source: company website · checked Sep 5, 2026
22	EBI ConsultingIndirect evidence	Burlington, MA, United StatesHQ checked Sep 5, 2026	501-1,000	535
	“For 35 years we have been helping investors, lenders, owners, developers, contractors, and property managers reduce risk and optimize their built facilities, infrastructure and…” Source: company website · checked Sep 5, 2026
23	Mining And Minerals Processing JobsPartial evidence	Clayton, NC, United StatesHQ checked Sep 5, 2026	n/a	529
	“Connecting industry professionals with the most successful companies in the North American mining industry is what we do best at Resource Erectors.” Source: company website · checked Sep 5, 2026
24	Nova Engineering And Environmental, LLCStrong evidence	Kennesaw, GA, United StatesHQ checked Sep 5, 2026	501-1,000	518
	“Established in 1996, NOVA was originally founded to provide Environmental Consulting, Geotechnical Engineering, and Construction Materials Testing and Inspection services to the…” Source: company website · checked Sep 5, 2026
25	BSC GroupPartial evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	51-200	504
	“BSC Group, Inc.(BSC) is a multidisciplinary consulting firm with a staff of more than 200 professionals and offices in Boston, Worcester, Andover, and West Yarmouth, MA, as well…” Source: company website · checked Sep 5, 2026

Showing 25 of 3,037 mining environmental consulting firms based in the United States

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Mining environmental consulting firms based in the United States at a glance

As of Sep 5, 2026

1-10Median size (employees)

HoustonLargest hub · 66 HQs

36,915Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

1,594

11-50

1,038

51-200

297

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

39,064

31–60

2,626

61–90

90–180

180+

158

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 mining environmental consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “mining environmental consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among mining environmental consulting 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 an evidence 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, 41,884 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 5, 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.

Mining environmental consulting firms by metro

Frequently asked

How many mining environmental consulting firms are there based in the United States?

RevenueBase identified 3,037 mining environmental consulting 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 mining environmental consulting firms?

Houston leads with 66 headquartered companies, followed by Denver (37) and Austin (32).

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 41,884 verified decision-maker contacts tracked across these 3,037 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 5, 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.