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Company lists · Data verified August 2026

Top 25 Environmental consulting firms mining based in the United States

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 3,945 companies tracked

There are 3,945 environmental consulting firms mining headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 136,657 professional contacts across them, including 64,534 with verified work emails and 57,439 with mobile numbers. Houston is the largest hub.

This list covers environmental consulting firms mining headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

3,945Companies
136,657Contacts tracked
64,534Verified emails
57,439Mobile numbers
Unlock all 3,945 companies Free account · no credit card · 2 minutes

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

Ranked by team size
Top 25 of 3,945 environmental consulting firms mining based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#CompanyHQEmployeesContactsVerified emails
1TerraconTustin, CA5,001-10,0006,0243,163
2GolderHouston, TX5,001-10,0003,1831,044
3Brown And CaldwellWalnut Creek, CA1,001-5,0002,4551
4Geosyntec ConsultantsBoca Raton, FL1,001-5,0002,3921,594
5ECS Group Of CompaniesFredericksburg, VA1,001-5,0002,2011,061
6DRA GlobalJohannesburg1,001-5,0002,1571,331
7Civil & Environmental Consultants, INCMartinsburg, WV1,001-5,0002,152945
8Langan Engineering & Environmental ServicesEl Segundo, CA1,001-5,0002,1361,662
9LJASarasota, FL1,001-5,0002,0731,578
10Swca Environmental ConsultantsPhoenix, AZ1,001-5,0001,6181,159
11GEI Consultants, INCWoburn, MA1,001-5,0001,5771,237
12Montrose Environmental GroupLittle Rock, AR1,001-5,0001,516846
13Partner Engineering & Science, INCPasadena, CA1,001-5,0001,348984
14SCS EngineersLong Beach, CA1,001-5,0001,191675
15Apex CompaniesRockville, MD1,001-5,0001,146591
16Bge, INCVero Beach, FL1,001-5,0001,129682
17VerdantasToledo, OH1,001-5,0001,127795
18Barr Engineering COWashington1,001-5,0001,098828
19Braun Intertec CorporationAmarillo, TX1,001-5,0001,054691
20GAI Consultants, INCJackson, MI501-1,000976514
21Trinity ConsultantsDallas, TX1,001-5,000949615
22Alliance Technical GroupPittsburgh, PA1,001-5,000946549
23ParametrixBerkeley, CA501-1,000875678
24GZA Geoenvironmental, INCBoston, MA501-1,000872627
25ATC Group Services LLCSharonville, OH1,001-5,000868278

Showing 25 of 3,945 environmental consulting firms mining based in the United States

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Environmental consulting firms mining based in the United States at a glance

As of Aug 28, 2026
1-10Median size (employees)
HoustonLargest hub · 74 HQs
57,439Contacts with mobile numbers
0Emails re-verified in last 30 days

Companies by employee count

1-10
1,993
11-50
1,372
51-200
411
201-500
89
501-1,000
25
1,001-5,000
34
5,001-10,000
4

Environmental consulting firms mining by metro

MetroCompanies
Environmental consulting firms mining in Houston74
Environmental consulting firms mining in Denver43
Environmental consulting firms mining in New York40
Environmental consulting firms mining in Tampa35
Environmental consulting firms mining in Austin35
Environmental consulting firms mining in Portland33
Environmental consulting firms mining in Seattle31

How this list was built

Source
The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion
Companies whose own business descriptions match “environmental consulting firms mining”, with match quality audited by blind human judging, and headquartered in the United States.
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
Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh
Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

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

There are 3,945 environmental consulting firms mining headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Terracon, headquartered in Tustin, tops this list with the largest team on record.

Which city has the most environmental consulting firms mining?

Houston leads with 74 headquartered companies, followed by Denver (43) and New York (40).

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 64,534 verified decision-maker contacts tracked across these 3,945 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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Related lists

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.

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