Company lists · Data refreshed September 2026

Top 25 Environmental law firms based in Houston, United States

Name: Environmental law firms based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 12, 2026 112 companies tracked

RevenueBase identified 112 environmental law firms headquartered in Houston, United States as of September 2026 and tracks 4,784 professional contacts across them, including 2,528 with verified work emails and 2,343 with mobile numbers. Washington is the largest hub.

This list covers environmental law firms headquartered in Houston, 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 12, 2026.

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 12, 2026 86% judged on-target in blind review

112Companies

4,784Contacts tracked

2,528Verified emails

2,343Mobile numbers

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The 25 largest environmental law firms based in Houston, United States

Ranked by team size

Top 25 of 112 environmental law firms based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 12, 2026. RevenueBase Smart Search rates how each company's information relates to environmental law 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	Vinson & Elkins	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1,001-5,000	1,693 contacts →
	Partial evidence “Vinson & Elkins is a law firm of global distinction, working with leading companies on wide-ranging matters in key industries across the economy.” Source: RevenueBase Database · checked Sep 12, 2026
2	Bracewell LLP	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	501-1,000	933 contacts →
	Partial evidence “Bracewell LLP is a leading law and government relations firm.” Source: RevenueBase Database · checked Sep 12, 2026
3	Schouest, Bamdas, Soshea & Benmaier Pllc	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	271 contacts →
	Partial evidence “Schouest, Bamdas, Soshea & BenMaier PLLC is a law firm focused on your needs.” Source: RevenueBase Database · checked Sep 12, 2026
4	GSI Environmental INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	259 contacts →
	Partial evidence “GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Source: RevenueBase Database · checked Sep 12, 2026
5	Porter Hedges LLP	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	222 contacts →
	Partial evidence “Porter Hedges is recognized as one of the premier business law firms based in Houston.” Source: RevenueBase Database · checked Sep 12, 2026
6	The Lanier LAW Firm	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	182 contacts →
	Partial evidence “Founded in 1990 by Mark Lanier, The Lanier Law Firm is committed to addressing client concerns with effective and often untraditional solutions.” Source: RevenueBase Database · checked Sep 12, 2026
7	Edge Engineering And Science, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	116 contacts →
	Indirect evidence “Edge Engineering & Science, LLC (EDGE) is a privately owned professional services firm headquartered in Houston, Texas.” Source: RevenueBase Database · checked Sep 12, 2026
8	Pappas Grubbs Price PC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	86 contacts →
	Indirect evidence “Pappas Grubbs Price is a Texas-based civil litigation defense firm.” Source: RevenueBase Database · checked Sep 12, 2026
9	Kuiper LAW Firm, Pllc	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	85 contacts →
	Partial evidence “Kuiper Law Firm has established itself as a trusted legal partner for businesses across diverse industries.” Source: RevenueBase Database · checked Sep 12, 2026
10	Aarc Environmental	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	63 contacts →
	Partial evidence “As a leader in the environmental compliance services industry, AARC does more than just meeting the needs of clients today.” Source: RevenueBase Database · checked Sep 12, 2026
11	Sage ATC Environmental Consulting	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	63 contacts →
	Partial evidence “Sage ATC Environmental Consulting is now Atlas.” Source: RevenueBase Database · checked Sep 12, 2026
12	Spirit Environmental Montrose Environmental Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	54 contacts →
	Indirect evidence “In July of 2024, Spirit was acquired by Onterris.” Source: RevenueBase Database · checked Sep 12, 2026
13	Toeppich And Associates	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	53 contacts →
	Partial evidence “Toeppich and Associates is one of the most recognized firms in the oil and gas industry, with attorneys practicing in all areas of oil and gas law, including title examination…” Source: RevenueBase Database · checked Sep 12, 2026
14	Daniels & Tredennick Pllc	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	42 contacts →
	Partial evidence “Daniels & Tredennick handles complex legal matters across both litigation and corporate law.” Source: RevenueBase Database · checked Sep 12, 2026
15	Hanszen Laporte, LLP	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	42 contacts →
	Partial evidence “HANSZEN LAPORTE IS A HOUSTON-BASED, AV “PREEMINENT” RATED LAW FIRM COMPRISED OF THREE PRACTICE GROUPS, LITIGATION, BUSINESS AND REAL ESTATE.” Source: RevenueBase Database · checked Sep 12, 2026
16	UES Professional Solutions 64, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	31 contacts →
	Partial evidence “Environmental Consulting and Engineering InControl Technologies was established in 1997 to provide high-end quality environmental consulting services to owners of commercial and…” Source: RevenueBase Database · checked Sep 12, 2026
17	Eggleston & Briscoe, LLP	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	21 contacts →
	Indirect evidence “Eggleston & Briscoe serves a predominantly corporate and institutional client base representing a variety of publicly and privately owned business interests.” Source: RevenueBase Database · checked Sep 12, 2026
18	Environmental Operational Solutions Eosolutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	19 contacts →
	Indirect evidence “At EOSolutions, we know you want your operations to stay in compliance.” Source: RevenueBase Database · checked Sep 12, 2026
19	The Carter LAW Firm	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1-10	19 contacts →
	Partial evidence “The Carter Law Firm represents businesses and individuals for their legal needs in the business and corporate sectors.” Source: RevenueBase Database · checked Sep 12, 2026
20	Kirby, Mathews & Walrath, Pllc	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	18 contacts →
	Indirect evidence “Kirby, Mathews & Walrath is a professional limited liability company which was founded on the idea that the participants in the oil and gas industry are best served by a firm that…” Source: RevenueBase Database · checked Sep 12, 2026
21	ERC Environmental & Construction Services	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	18 contacts →
	Partial evidence “ERC is a Professional Services Firm in Environmental Consulting and Construction.” Source: RevenueBase Database · checked Sep 12, 2026
22	Feldman & Feldman PC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1-10	17 contacts →
	Indirect evidence “With deep roots in Houston and Harris County, Cris and David Feldman have established a firm with a record in complex civil litigation, commercial disputes, personal injury…” Source: RevenueBase Database · checked Sep 12, 2026
23	Shipley Snell Montgomery LLP	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	16 contacts →
	Indirect evidence “Shipley Snell is a boutique litigation firm focused on companies’ most complex and high-value legal issues in state and federal court cases, domestic and international arbitration…” Source: RevenueBase Database · checked Sep 12, 2026
24	Smith Parker Elliott, Pllc	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	15 contacts →
	Indirect evidence “A successful business is built upon good relationships.” Source: RevenueBase Database · checked Sep 12, 2026
25	Mcfadden Trachtenberg Pllc	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	15 contacts →
	Indirect evidence “We get it.” Source: RevenueBase Database · checked Sep 12, 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 law 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 law firms.
Partial evidence: Its own public description names part of environmental law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental law 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 112 environmental law firms based in Houston, United States

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Environmental law firms based in Houston, United States at a glance

As of Sep 12, 2026

52.8%Verified-email coverage

49.0%Mobile-number coverage

42.7Average contacts per company

1-10Median size (employees)

118.8%Largest-city concentration · Washington

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 15.0d

2,1170–30

37831–60

1061–90

190–180

22180+

Company record updated

Median 57.0d

00–30

2,43231–60

1,75561–90

40890–180

189180+

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 law 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.
What qualifies: Companies headquartered in Houston, United States whose own description of what they do matches “environmental law 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 law 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 law firms, and records with no verified work email. Companies headquartered outside Houston 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 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, 2,528 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 12, 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 law firms by metro in the United States

Environmental law firms in Washington133
Environmental law firms in New York127
Environmental law firms in Houston112
Environmental law firms in Chicago77
Environmental law firms in Los Angeles71
Environmental law firms in Austin62
Environmental law firms in San Francisco58
Environmental law firms in Dallas58

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 law 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 law firms are there based in Houston, United States?

RevenueBase identified 112 environmental law firms headquartered in Houston, 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?

Vinson & Elkins, headquartered in Houston, tops this list with the largest team on record.

Which city has the most environmental law firms?

Washington leads with 133 headquartered companies, followed by New York (127) and Houston (112).

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 2,528 verified decision-maker contacts tracked across these 112 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 12, 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 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.