Company lists · Data refreshed September 2026

Top 25 Sustainability consulting firms based in Houston, United States

Name: Sustainability 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 6, 2026 97 companies tracked

RevenueBase identified 97 sustainability consulting firms headquartered in Houston, United States as of September 2026 and tracks 1,249 professional contacts across them, including 451 with verified work emails. New York is the largest hub.

This list covers sustainability 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 6, 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 6, 2026 86% judged on-target in blind review

97Companies

1,249Contacts tracked

451Verified emails

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The 25 largest sustainability consulting firms based in Houston, United States

Ranked by team size

Top 25 of 97 sustainability consulting firms based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 6, 2026. RevenueBase Smart Search rates how each company's information relates to sustainability 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	GSI Environmental INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	201-500	259 contacts →
	“GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Source: company website · checked Sep 6, 2026
2	Milestone Environmental	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	201-500	128 contacts →
	“Milestone Environmental is a leading environmental infrastructure and services company delivering reliable, safe, compliant and best-in-class waste management solutions.” Source: company website · checked Sep 6, 2026
3	Edge Engineering And Science, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	51-200	116 contacts →
	“Edge Engineering & Science, LLC (EDGE) is a privately owned professional services firm headquartered in Houston, Texas.” Source: company website · checked Sep 6, 2026
4	Climeco	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	51-200	96 contacts →
	“ClimeCo is an award-winning leader in decarbonization, empowering global organizations with customized sustainability pathways.” Source: company website · checked Sep 6, 2026
5	Aarc Environmental	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	51-200	63 contacts →
	“As a leader in the environmental compliance services industry, AARC does more than just meeting the needs of clients today.” Source: company website · checked Sep 6, 2026
6	Sage ATC Environmental Consulting	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	201-500	63 contacts →
	“Sage ATC Environmental Consulting is now Atlas.” Source: company website · checked Sep 6, 2026
7	Spirit Environmental Montrose Environmental Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	51-200	54 contacts →
	“In July of 2024, Spirit was acquired by Onterris.” Source: company website · checked Sep 6, 2026
8	UES Professional Solutions 64, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	31 contacts →
	“Environmental Consulting and Engineering InControl Technologies was established in 1997 to provide high-end quality environmental consulting services to owners of commercial and…” Source: company website · checked Sep 6, 2026
9	English Associates Architects, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	28 contacts →
	“English + Associates Architects is a full-service architectural and interior design firm specializing in high-performance, green-design solutions.” Source: company website · checked Sep 6, 2026
10	HSE International LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	23 contacts →
	“HSE International provides environmental, social, safety and strategic advisory services to the energy, infrastructure, extractive, financial and government sectors.” Source: company website · checked Sep 6, 2026
11	Acorn International, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	22 contacts →
	“Acorn International, LLC delivers environmental and social risk management consulting services to international industry and investors.” Source: company website · checked Sep 6, 2026
12	TGE Resources, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	21 contacts →
	Source: company website · checked Sep 6, 2026
13	Environmental Operational Solutions Eosolutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	19 contacts →
	“At EOSolutions, we know you want your operations to stay in compliance.” Source: company website · checked Sep 6, 2026
14	ERC Environmental & Construction Services	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	18 contacts →
	“ERC is a Professional Services Firm in Environmental Consulting and Construction.” Source: company website · checked Sep 6, 2026
15	Mcbride Sustainability	Strong evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	17 contacts →
	“McBride SustainAbility is the leader consulting company with more than fifteen years of experience in sustainability, social responsibility, public relations as well as internal…” Source: company website · checked Sep 6, 2026
16	Spark Thought	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	16 contacts →
	“At Spark Thought, we help energy and industrial companies thrive by delivering practical, results-driven consulting in three mission-critical areas: Regulatory Compliance Services…” Source: company website · checked Sep 6, 2026
17	SKA Consulting, L.P	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	13 contacts →
	“SKA Consulting is a professional environmental engineering and consulting firm providing timely, innovative solutions to today’s environmental challenges.” Source: company website · checked Sep 6, 2026
18	Bocci Engineering	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	1-10	13 contacts →
	“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: company website · checked Sep 6, 2026
19	Devaltec	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	1-10	9 contacts →
	“We help companies and their investors succeed in the Energy Transition We offer integrated support in Consulting and Project Development in Sustainable Energy” Source: company website · checked Sep 6, 2026
20	Cimbria Consulting	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	9 contacts →
	“Cimbria Consulting is a technical, scientific, and management consulting firm offering pragmatic tools to capture economic value for small-to-medium enterprises in agribusiness…” Source: company website · checked Sep 6, 2026
21	Cypress Environmental Consulting	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	1-10	8 contacts →
	“Cypress Environmental Consulting LLC (CEC) provides a broad range of environmental services including planning, site assessment, and permitting with a focus on regulatory…” Source: company website · checked Sep 6, 2026
22	Creatum Energy	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	51-200	7 contacts →
	“Our expertise extends to data center, power generation, solar, wind, oil and gas, and other energy sources, providing clients with tailored strategies for a cleaner and more…” Source: company website · checked Sep 6, 2026
23	Corrigan Consulting INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	11-50	7 contacts →
	“Since 1986, CCI has been providing specialized services in hazardous waste compliance, permitting, site investigations, and closures; underground storage tank removals and…” Source: company website · checked Sep 6, 2026
24	ESG Lynk, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	1-10	6 contacts →
	“ESG Lynk was founded to bring the discipline, rigor, and accountability of financial reporting into the rapidly evolving world of sustainability and ESG.” Source: company website · checked Sep 6, 2026
25	Sesco Environmental	Indirect evidence	Houston, TX, United StatesHQ checked Sep 6, 2026	1-10	6 contacts →
	“Sustainable Environmental Solutions Company, SESCO, is based in Houston, Texas and is considered an innovator in the environmental solutions industry.” Source: company website · checked Sep 6, 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: sustainability 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 sustainability consulting firms.
Partial evidence: Its own public description names part of sustainability consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainability 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 97 sustainability consulting firms based in Houston, United States

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Sustainability consulting firms based in Houston, United States at a glance

As of Sep 6, 2026

36.1%Verified-email coverage

12.9Average contacts per company

1-10Median size (employees)

183.5%Largest-city concentration · New York

Sep 6, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 97 companies.

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 sustainability 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 “sustainability 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 sustainability 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 sustainability 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, 451 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 6, 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.

Sustainability consulting firms by metro in the United States

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

RevenueBase identified 97 sustainability 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?

GSI Environmental INC, headquartered in Houston, tops this list with the largest team on record.

Which city has the most sustainability consulting firms?

New York leads with 178 headquartered companies, followed by Houston (97) and Los Angeles (90).

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 451 verified decision-maker contacts tracked across these 97 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 6, 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.