Company lists · Data refreshed September 2026

Top 25 Environmental compliance consulting firms based in Houston, United States

Name: Environmental compliance consulting 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 69 companies tracked

RevenueBase identified 69 environmental compliance consulting firms headquartered in Houston, United States as of September 2026 and tracks 1,813 professional contacts across them, including 812 with verified work emails and 791 with mobile numbers. Houston is the largest hub.

This list covers environmental compliance consulting 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

69Companies

1,813Contacts tracked

812Verified emails

791Mobile numbers

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

The 25 largest environmental compliance consulting firms based in Houston, United States

Ranked by team size

Top 25 of 69 environmental compliance consulting 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 compliance consulting 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	VLS Environmental Solutions, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1,001-5,000	481 contacts →
	Partial evidence “At VLS, we address your company’s most significant hurdles with waste management and compliance through sustainable solutions.” Source: RevenueBase Database · checked Sep 12, 2026
2	GSI Environmental INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	259 contacts →
	Strong 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
3	Milestone Environmental	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	128 contacts →
	Strong evidence “Milestone Environmental is a leading environmental infrastructure and services company delivering reliable, safe, compliant and best-in-class waste management solutions.” Source: RevenueBase Database · checked Sep 12, 2026
4	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
5	Perennial Environmental Services	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	102 contacts →
	Partial evidence “Perennial Environmental Services, LLC, has been providing technical environmental solutions and management with fresh perspectives and unparalleled efficiency since 2003.” Source: RevenueBase Database · checked Sep 12, 2026
6	Aarc Environmental	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	63 contacts →
	Strong 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
7	RCP INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	63 contacts →
	Partial evidence “RCP is the regulatory compliance and risk management expert for pipelines, facilities, and terminal operations.” Source: RevenueBase Database · checked Sep 12, 2026
8	Sage ATC Environmental Consulting	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	63 contacts →
	Strong evidence “Sage ATC Environmental Consulting is now Atlas.” Source: RevenueBase Database · checked Sep 12, 2026
9	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
10	J Connor Consulting, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	39 contacts →
	Indirect evidence “The Company J.” Source: RevenueBase Database · checked Sep 12, 2026
11	RSB Environmental, An Alliance Technical Group Company	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	38 contacts →
	Strong evidence “RSB Environmental, an Alliance Technical Group company, is a full-service environmental engineering consulting firm, specializing in environmental health and safety services and…” Source: RevenueBase Database · checked Sep 12, 2026
12	Phase Engineering, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	34 contacts →
	Strong evidence “Phase Engineering, LLC, was founded in 1993 and is a leading engineering and environmental consulting firm, serving clients nationwide to deliver trusted environmental solutions.” Source: RevenueBase Database · checked Sep 12, 2026
13	UES Professional Solutions 64, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	31 contacts →
	Strong 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
14	Acorn International, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	22 contacts →
	Strong evidence “Acorn International, LLC delivers environmental and social risk management consulting services to international industry and investors.” Source: RevenueBase Database · checked Sep 12, 2026
15	TGE Resources, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	21 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 12, 2026
16	Environmental Operational Solutions Eosolutions	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	19 contacts →
	Partial evidence “At EOSolutions, we know you want your operations to stay in compliance.” Source: RevenueBase Database · checked Sep 12, 2026
17	ERC Environmental & Construction Services	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	18 contacts →
	Strong evidence “ERC is a Professional Services Firm in Environmental Consulting and Construction.” Source: RevenueBase Database · checked Sep 12, 2026
18	SKA Consulting, L.P	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	13 contacts →
	Strong evidence “SKA Consulting is a professional environmental engineering and consulting firm providing timely, innovative solutions to today’s environmental challenges.” Source: RevenueBase Database · checked Sep 12, 2026
19	Bocci Engineering	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1-10	13 contacts →
	Partial evidence “Bocci is an energy and environmental engineering consultancy based in Houston, Texas providing high quality, innovative and cost-effective solutions that significantly reduce or…” Source: RevenueBase Database · checked Sep 12, 2026
20	PEI Consulting Group, INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	11 contacts →
	Strong evidence “PEI Consulting Group, Inc.(PEI) is an employee owned full-service environmental consulting and engineering firm providing timely, innovative solutions to today’s environmental…” Source: RevenueBase Database · checked Sep 12, 2026
21	Cypress Environmental Consulting	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1-10	8 contacts →
	Strong evidence “Cypress Environmental Consulting LLC (CEC) provides a broad range of environmental services including planning, site assessment, and permitting with a focus on regulatory…” Source: RevenueBase Database · checked Sep 12, 2026
22	Corrigan Consulting INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	7 contacts →
	Partial evidence “Since 1986, CCI has been providing specialized services in hazardous waste compliance, permitting, site investigations, and closures; underground storage tank removals and…” Source: RevenueBase Database · checked Sep 12, 2026
23	Sesco Environmental	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1-10	6 contacts →
	Partial evidence “Sustainable Environmental Solutions Company, SESCO, is based in Houston, Texas and is considered an innovator in the environmental solutions industry.” Source: RevenueBase Database · checked Sep 12, 2026
24	Disorbo Consulting, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	5 contacts →
	Partial evidence “DiSorbo Consulting is now a part of Trinity Consultants.” Source: RevenueBase Database · checked Sep 12, 2026
25	Reces Environmental Consulting	Strong evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	4 contacts →
	Strong evidence “RECES, LLC is an environmental consulting firm specializing in air, water, and wastewater permitting and regulatory compliance for clients throughout the United States.” 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 compliance consulting 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 compliance consulting firms.
Partial evidence: Its own public description names part of environmental compliance consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental compliance consulting 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 69 environmental compliance consulting firms based in Houston, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 812 reachable decision-makers.

Free signup · no credit card

View the full list →

Environmental compliance consulting firms based in Houston, United States at a glance

As of Sep 12, 2026

44.8%Verified-email coverage

43.6%Mobile-number coverage

26.3Average contacts per company

11-50Median size (employees)

85.5%Largest-city concentration · Houston

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Freshness & accuracy

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

Email last verified

Median 14.0d

6650–30

14031–60

561–90

290–180

0180+

Company record updated

Median 73.0d

00–30

84231–60

71761–90

17990–180

75180+

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 compliance consulting 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 compliance consulting 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 compliance consulting 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 compliance consulting 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, 812 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 compliance consulting firms by metro in the United States

Environmental compliance consulting firms in Houston59
Environmental compliance consulting firms in New York39
Environmental compliance consulting firms in Denver32
Environmental compliance consulting firms in Austin31
Environmental compliance consulting firms in Phoenix31
Environmental compliance consulting firms in San Diego27
Environmental compliance consulting firms in Seattle26

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 compliance consulting 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 compliance consulting firms are there based in Houston, United States?

RevenueBase identified 69 environmental compliance consulting 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?

VLS Environmental Solutions, LLC, headquartered in Houston, tops this list with the largest team on record.

Which city has the most environmental compliance consulting firms?

Houston leads with 59 headquartered companies, followed by New York (39) and Denver (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 812 verified decision-maker contacts tracked across these 69 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.

Ready to reach these companies? Verified emails and direct dials for all 69 environmental compliance consulting firms based in Houston, United States. Start with a free account, no credit card.

Download this list →

Related lists

Environmental compliance consulting 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 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.