Company lists · Data refreshed September 2026

Top 25 Environmental compliance law firms based in the United States

Name: Environmental compliance law 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 28, 2026 2,261 companies tracked

RevenueBase identified 2,261 company matches for environmental compliance law firms associated with the United States as of September 2026 and tracks 53,593 professional contacts across them, including 30,318 with verified work emails. Washington is the largest hub.

This list covers company matches for environmental compliance law 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 September 28, 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 Sep 28, 2026 How this list was built

2,261Companies

53,593Contacts tracked

30,318Verified emails

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

The 25 largest environmental compliance law firms based in the United States

Ranked by team size

Top 25 of 2,261 company matches for environmental compliance law firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 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	Nelson Mullins Riley & Scarborough	Exact match	Columbia, SC, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,012 contacts →
	Exact match “Established in 1897, Nelson Mullins is an Am Law 100 firm of more than attorneys, policy advisors and professionals with 33 offices in 17 states and Washington, D.C.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Venable LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,790 contacts →
	Exact match “Committed to Your Success – As a law firm of more than 900 professionals, Venable delivers legal services globally in every area of regulatory compliance, government affairs…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	Ballard Spahr LLP	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,682 contacts →
	Exact match “Ballard Spahr LLP, an Am Law 100 law firm with more than 750 lawyers in 19 U.S.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	Buchanan Ingersoll & Rooney PC	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 28, 2026	501-1,000	1,197 contacts →
	Exact match “Buchanan Ingersoll & Rooney is a national law firm with a proven reputation for providing progressive, industry-leading legal, business, regulatory and government relations advice…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Alliance Technical Group	Exact match	Decatur, AL, United StatesHQ recorded Sep 28, 2026	1,001-5,000	956 contacts →
	Exact match “Alliance is a new kind of environmental services company-powered by innovation, focused on service, and committed to client success.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Bracewell LLP	Exact match	Houston, TX, United StatesHQ recorded Sep 28, 2026	501-1,000	933 contacts →
	Exact match “Bracewell LLP is a leading law and government relations firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Brownstein Hyatt Farber Schreck	Exact match	Denver, CO, United StatesHQ recorded Sep 28, 2026	501-1,000	902 contacts →
	Exact match “For decades, we’ve positioned ourselves at the intersection of law, business and policy to bring a multidisciplinary strategy to every issue.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	Hall Booth Smith, P.C	Exact match	Atlanta, GA, United StatesHQ recorded Sep 28, 2026	501-1,000	815 contacts →
	Exact match “Established in 1989, Hall Booth Smith, P.C.(HBS) is a full-service law firm with 33 offices across the United States.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	CT Corporation	Exact match	New York, NY, United StatesHQ recorded Sep 28, 2026	1,001-5,000	788 contacts →
	Exact match “CT Corporation helps small businesses, corporations, and law firms around the world manage their most critical business and legal compliance responsibilities.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	Steptoe & Johnson Pllc	Exact match	Bridgeport, WV, United StatesHQ recorded Sep 28, 2026	501-1,000	757 contacts →
	Exact match “Steptoe & Johnson PLLC is a law firm nationally recognized for its strengths in energy law with more than a century of know-how in the areas of business, employment, and…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Environmental Science Associates	Exact match	San Francisco, CA, United StatesHQ recorded Sep 28, 2026	501-1,000	732 contacts →
	Exact match “ESA is a 100% employee-owned environmental consulting firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Kelley Drye & Warren LLP	Exact match	New York, NY, United StatesHQ recorded Sep 28, 2026	501-1,000	690 contacts →
	Exact match “Kelley Drye is an AmLaw 200 law firm of more than 350 lawyers and other professionals practicing in New York, NY; Washington, D.C; Chicago, IL; Houston, TX, Los Angeles, CA; San…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Robinson Cole	Exact match	Hartford, CT, United StatesHQ recorded Sep 28, 2026	201-500	622 contacts →
	Exact match “Robinson+Cole is a service mark of Robinson & Cole LLP, a law firm with offices throughout the Northeast, Mid-Atlantic, Florida, and California serving regional, national, and…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	Parker POE Adams & Bernstein LLP	Exact match	Charlotte, NC, United StatesHQ recorded Sep 28, 2026	501-1,000	584 contacts →
	Exact match “Businesses and local governments turn to Parker Poe to structure transactions, navigate regulations, and resolve disputes.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Bond, Schoeneck & King Pllc	Exact match	Syracuse, NY, United StatesHQ recorded Sep 28, 2026	201-500	581 contacts →
	Exact match “Bond is a full-service law firm counseling individuals, companies, not-for-profits and public sector entities in a wide spectrum of practice areas.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	Wiley Rein LLP	Exact match	Washington, DC, United StatesHQ recorded Sep 28, 2026	501-1,000	576 contacts →
	Exact match “Founded in 1983, Wiley is a dominant presence in the nation’s capital.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Best Best & Krieger LLP BBK	Exact match	Riverside, CA, United StatesHQ recorded Sep 28, 2026	201-500	522 contacts →
	Exact match “Best Best & Krieger serves as a trusted partner and strategist to public and private sector clients across the nation.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	Rincon Consultants	Exact match	Ventura, CA, United StatesHQ recorded Sep 28, 2026	501-1,000	479 contacts →
	Exact match “Rincon Consultants is a multi-disciplinary environmental sciences, planning, and engineering consulting firm that provides quality professional services to government and industry.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Balch & Bingham LLP	Exact match	Birmingham, AL, United StatesHQ recorded Sep 28, 2026	201-500	472 contacts →
	Exact match “Balch & Bingham LLP is a full-service corporate law firm recognized nationally for its genuine dedication to its clients, forward-thinking approach, and ability to anticipate what…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	Groundwater & Environmental Services, INC	Exact match	Wall Township, NJ, United StatesHQ recorded Sep 28, 2026	201-500	447 contacts →
	Exact match “We are Groundwater & Environmental Services, Inc, better known as GES.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	ROUX	Exact match	Islandia, NY, United StatesHQ recorded Sep 28, 2026	201-500	433 contacts →
	Exact match “Founded 40 years ago, Roux is recognized for being a highly effective, client-focused environmental consulting and management firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	Morrison Mahoney LLP	Exact match	Boston, MA, United StatesHQ recorded Sep 28, 2026	201-500	398 contacts →
	Exact match “For 75 years, Morrison Mahoney LLP has been committed to servicing its clients' needs and working with its clients to achieve desired goals and objectives.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	Mcelroy, Deutsch, Mulvaney & Carpenter, LLP	Exact match	Morristown, NJ, United StatesHQ recorded Sep 28, 2026	201-500	344 contacts →
	Exact match “McElroy, Deutsch, Mulvaney & Carpenter, LLP ("McElroy Deutsch") is a diverse practice with lawyers who place the client first.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	Post & Schell, P.C	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	201-500	336 contacts →
	Exact match “For over 50 years, Post & Schell’s attorneys have combined the operational knowledge and insight into the industries they represent with creative legal solutions – and helped…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	Nossaman LLP	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 28, 2026	201-500	332 contacts →
	Exact match “Nossaman LLP is a national law firm with attorneys and policy advisors located in 12 offices throughout the United States.” Recorded in the RevenueBase company graph · Sep 28, 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 “environmental compliance law 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 2,261 environmental compliance law firms based in the United States

See the full list, filter by size, metro and specialty, and access 30,318 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Environmental compliance law firms based in the United States at a glance

As of Sep 28, 2026

56.6%Verified-email coverage

23.7Average contacts per company

1-10Median size (employees)

3.9%Largest-city concentration · Washington

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,254

11-50

746

51-200

199

201-500

501-1,000

1,001-5,000

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 2,261 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 “environmental compliance law 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 30,318 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 September 28, 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.

Environmental compliance law 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 “environmental compliance law firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many environmental compliance law firms are there based in the United States?

RevenueBase identified 2,261 company matches for environmental compliance law firms associated with the United States as of September 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?

Nelson Mullins Riley & Scarborough tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most environmental compliance law firms?

Washington leads with 88 company records, followed by Houston (64) and Austin (48).

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 30,318 professional contacts with verified work emails tracked across these 2,261 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 September 28, 2026.

Ready to reach these companies? Verified emails and direct dials for all 2,261 environmental compliance law firms based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Environmental compliance law firms by geography

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 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.