Company lists · Data refreshed September 2026

Top 25 Environmental organizations based in Houston, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 65 companies tracked

RevenueBase identified 65 environmental organizations headquartered in Houston, United States as of September 2026 and tracks 925 professional contacts across them, including 381 with verified work emails. Washington is the largest hub.

This list covers environmental organizations 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 19, 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 19, 2026 86% judged on-target in blind review

65Companies

925Contacts tracked

381Verified emails

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

The 25 largest environmental organizations based in Houston, United States

Ranked by team size

Top 25 of 65 environmental organizations based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental organizations: 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	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 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 19, 2026
2	Perennial Environmental Services	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	102 contacts →
	Strong 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 19, 2026
3	Aarc Environmental	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 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 19, 2026
4	Sage ATC Environmental Consulting	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	63 contacts →
	Strong evidence “Sage ATC Environmental Consulting is now Atlas.” Source: RevenueBase Database · checked Sep 19, 2026
5	Spirit Environmental Montrose Environmental Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	54 contacts →
	Indirect evidence “In July of 2024, Spirit was acquired by Onterris.” Source: RevenueBase Database · checked Sep 19, 2026
6	Houston Arboretum & Nature Center	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	46 contacts →
	Strong evidence “The Houston Arboretum & Nature Center is a non-profit organization with a mission to provide education about the natural environment to people of all ages and to protect and…” Source: RevenueBase Database · checked Sep 19, 2026
7	UES Professional Solutions 64, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 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 19, 2026
8	Coastal Conservation Association	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	30 contacts →
	Indirect evidence “CCA was created in 1977, after drastic commercial overfishing along the Texas coast had decimated redfish and speckled trout populations.” Source: RevenueBase Database · checked Sep 19, 2026
9	AIR Alliance Houston	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	24 contacts →
	Strong evidence “Air Alliance Houston is a non-profit advocacy organization working to reduce the public health impacts from air pollution and advance environmental justice.” Source: RevenueBase Database · checked Sep 19, 2026
10	Trees For Houston	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	22 contacts →
	Indirect evidence “Established in 1983, Trees For Houston’s efforts initially centered on planting street trees in the heart of Houston, Texas.” Source: RevenueBase Database · checked Sep 19, 2026
11	ERC Environmental & Construction Services	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	18 contacts →
	Strong evidence “ERC is a Professional Services Firm in Environmental Consulting and Construction.” Source: RevenueBase Database · checked Sep 19, 2026
12	Element Markets	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	14 contacts →
	Indirect evidence “On June 14, 2022, Element Markets and Bluesource formally merged under a new brand name, Anew™, and introduced “Climate as a Service” – an approach that offers companies and…” Source: RevenueBase Database · checked Sep 19, 2026
13	Houston Wilderness	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	14 contacts →
	Strong evidence “HOUSTON WILDERNESS is a broad-based alliance of business, environmental and government interests that act in concert to protect, preserve and promote the unique biodiversity of…” Source: RevenueBase Database · checked Sep 19, 2026
14	Terrapass	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	11 contacts →
	Indirect evidence “Terrapass is a multi-disciplinary team of individuals dedicated to the fight against climate change.” Source: RevenueBase Database · checked Sep 19, 2026
15	Texas Health And Environment Alliance	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	11 contacts →
	Strong evidence “The mission of Texas Health and Environment Alliance (THEA) is to protect water resources, public health, and irreplaceable resources like Galveston Bay’s precious estuary from…” Source: RevenueBase Database · checked Sep 19, 2026
16	Bayou Preservation	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	9 contacts →
	Strong evidence “For over 55 years, we’ve been Houston's longest-running and most trusted environmental conservation nonprofit.” Source: RevenueBase Database · checked Sep 19, 2026
17	Cypress Environmental Consulting	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 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 19, 2026
18	Citizens' Environmental Coalition	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	7 contacts →
	Strong evidence “The CEC is an alliance of over 100 nonprofit, governmental, and educational organizations whose work impacts our environment and quality of life in the Houston-Galveston area.” Source: RevenueBase Database · checked Sep 19, 2026
19	Coalition For Environment, Equity And Resilience	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	7 contacts →
	Strong evidence “The Coalition for Environment, Equity & Resilience (CEER) is a coalition made up of 27 nonprofit member organizations that came together after Hurricane Harvey to advance policy…” Source: RevenueBase Database · checked Sep 19, 2026
20	Corrigan Consulting INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	7 contacts →
	Indirect 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 19, 2026
21	Spatial Analytics And Research Consulting	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	6 contacts →
	Strong evidence “Spatial Analytics and Research Consulting is a small environmental consulting partnership (founded 2022) specializing in GIS, data analysis, and research.” Source: RevenueBase Database · checked Sep 19, 2026
22	Sesco Environmental	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	6 contacts →
	Strong 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 19, 2026
23	Beam Earth	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	5 contacts →
	Strong evidence “A clean technology-centric ecosystem, Beam Earth provides funding for environmentally-aligned businesses and services across the investment themes of clean energy, sustainability…” Source: RevenueBase Database · checked Sep 19, 2026
24	The Jacob And Terese Hershey Foundation	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence “The Jacob and Terese Hershey Foundation envisions a world where people and nature live in harmony and good health.” Source: RevenueBase Database · checked Sep 19, 2026
25	Reces Environmental Consulting	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 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 19, 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 organizations. 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 organizations.
Partial evidence: Its own public description names part of environmental organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental organizations. 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 65 environmental organizations based in Houston, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 381 reachable decision-makers.

Free signup · no credit card

View the full list →

Environmental organizations based in Houston, United States at a glance

As of Sep 19, 2026

41.2%Verified-email coverage

14.2Average contacts per company

1-10Median size (employees)

321.5%Largest-city concentration · Washington

Sep 19, 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 for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 65 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 environmental organizations, 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 organizations”. 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 organizations), 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 organizations, 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, 381 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 19, 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 organizations 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 environmental organizations, 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 organizations are there based in Houston, United States?

RevenueBase identified 65 environmental organizations 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 environmental organizations?

Washington leads with 209 headquartered companies, followed by New York (204) and Los Angeles (133).

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 381 verified decision-maker contacts tracked across these 65 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 19, 2026.

Ready to reach these companies? Verified emails and direct dials for all 65 environmental organizations based in Houston, United States. Start with a free account, no credit card.

Download this list →

Related lists

Environmental organizations by geography

Browse the directory

Browse: Companies home · Environmental organizations in United States · All United States lists · All Environmental organizations lists · New lists

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.