Company lists · Data refreshed September 2026

Top 25 Pollution control organizations based in the United States

Name: Pollution control organizations based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 551 companies tracked

RevenueBase identified 551 pollution control organizations headquartered in the United States as of September 2026 and tracks 20,966 professional contacts across them, including 5,464 with verified work emails. Houston is the largest hub.

This list covers pollution control organizations headquartered in the 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 20, 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 20, 2026 86% judged on-target in blind review

551Companies

20,966Contacts tracked

5,464Verified emails

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The 25 largest pollution control organizations based in the United States

Ranked by team size

Top 25 of 551 pollution control organizations based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to pollution control 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	Montrose Environmental Group	Indirect evidence	Little Rock, AR, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,529 contacts →
	Indirect evidence “Onterris (formerly Montrose Environmental Group) was one of the first to see environmental responsibility as not just an imperative but as a strategic asset.” Source: RevenueBase Database · checked Sep 20, 2026
2	NJ Department Of Environmental Protection	Indirect evidence	Trenton, NJ, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,388 contacts →
	Indirect evidence “On America's first official "Earth Day", April 22, 1970, the New Jersey Department of Environmental Protection was born.” Source: RevenueBase Database · checked Sep 20, 2026
3	Minnesota Pollution Control Agency	Strong evidence	St. Paul, MN, United StatesHQ checked Sep 20, 2026	501-1,000	632 contacts →
	Strong evidence “The Minnesota Pollution Control Agency monitors environmental quality, offers technical and financial assistance and enforces environmental regulations.” Source: RevenueBase Database · checked Sep 20, 2026
4	ROUX	Indirect evidence	Islandia, NY, United StatesHQ checked Sep 20, 2026	201-500	433 contacts →
	Indirect evidence “Founded 40 years ago, Roux is recognized for being a highly effective, client-focused environmental consulting and management firm.” Source: RevenueBase Database · checked Sep 20, 2026
5	GSI Environmental INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	201-500	259 contacts →
	Indirect 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 20, 2026
6	Environmental Works, INC	Indirect evidence	Springfield, MO, United StatesHQ checked Sep 20, 2026	201-500	238 contacts →
	Indirect evidence “Environmental Works, Inc.(EWI) offers truly comprehensive environmental solutions for a variety of industries, businesses, and municipalities.” Source: RevenueBase Database · checked Sep 20, 2026
7	Metiri Group	Indirect evidence	Clovis, CA, United StatesHQ checked Sep 20, 2026	n/a	233 contacts →
	Indirect evidence “Appl Inc is an environmental services company based out of 908 N Temperance Ave, Clovis, CA, United States.” Source: RevenueBase Database · checked Sep 20, 2026
8	Patriot Environmental Services	Indirect evidence	Signal Hill, CA, United StatesHQ checked Sep 20, 2026	201-500	223 contacts →
	Indirect evidence “Patriot Environmental Services, a Crystal Clean company, is a leading environmental service provider with clients throughout the Southwestern United States.” Source: RevenueBase Database · checked Sep 20, 2026
9	Arkansas Department Of Environmental Quality	Partial evidence	Bonsall, CA, United StatesHQ checked Sep 20, 2026	201-500	163 contacts →
	Partial evidence “ADEQ protects the air, water and land from the threat of pollution.” Source: RevenueBase Database · checked Sep 20, 2026
10	Cleanair Engineering	Indirect evidence	Palatine, IL, United StatesHQ checked Sep 20, 2026	51-200	152 contacts →
	Indirect evidence “Since its founding in 1972, CleanAir has an established reputation for excellence on projects of all sizes, ranging from boiler, APC equipment and cooling tower efficiency testing…” Source: RevenueBase Database · checked Sep 20, 2026
11	Anguil Environmental Systems, INC	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 20, 2026	51-200	140 contacts →
	Indirect evidence “Anguil Environmental provides highly-engineered, environmental equipment and service solutions that help clients solve complex industrial air and water challenges across the globe.” Source: RevenueBase Database · checked Sep 20, 2026
12	Mostardi Platt	Indirect evidence	Elmhurst, IL, United StatesHQ checked Sep 20, 2026	51-200	140 contacts →
	Indirect evidence “Since the passage of original environmental legislation nearly four decades ago, both private and public industry have turned to Mostardi Platt for guidance in complying with air…” Source: RevenueBase Database · checked Sep 20, 2026
13	Ensolum, LLC	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 20, 2026	51-200	136 contacts →
	Indirect evidence “OUR MISSION is to combine sustainable environmental solutions with forward-thinking, cost-effective, innovative, and value-added technologies that balance our clients’ economic…” Source: RevenueBase Database · checked Sep 20, 2026
14	Airtek Construction	Strong evidence	Troy, United StatesHQ checked Sep 20, 2026	51-200	122 contacts →
	Strong evidence “AirTek is a leading supplier of air pollution control (APC) equipment and services for a wide range of customers in the power generation, pulp and paper, petrochemical, rock…” Source: RevenueBase Database · checked Sep 20, 2026
15	Hart & Hickman, PC	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 20, 2026	51-200	103 contacts →
	Indirect evidence “Hart & Hickman PC provides environmental consulting services to commercial, industrial, and governmental clients throughout the Southeast US.” Source: RevenueBase Database · checked Sep 20, 2026
16	Chambers Group, INC	Indirect evidence	Costa Mesa, CA, United StatesHQ checked Sep 20, 2026	51-200	98 contacts →
	Indirect evidence “Public agencies and businesses have been relying on Chambers Group to keep them in compliance with applicable federal, state, and/or local environmental laws, regulations, and…” Source: RevenueBase Database · checked Sep 20, 2026
17	A-Tech Consulting, INC	Indirect evidence	Orange, CA, United StatesHQ checked Sep 20, 2026	51-200	97 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
18	BBJ Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	97 contacts →
	Indirect evidence “BBJ provides clients with solutions to environmental, health and safety problems.” Source: RevenueBase Database · checked Sep 20, 2026
19	Yorke Engineering, LLC	Indirect evidence	San Juan Capistrano, CA, United StatesHQ checked Sep 20, 2026	51-200	92 contacts →
	Indirect evidence “Yorke Engineering, LLC (Yorke) was founded in 1996 and specializes in air quality, waste, storm water and industrial hygiene/safety services.” Source: RevenueBase Database · checked Sep 20, 2026
20	SAN Diego County AIR Pollution Control District	Strong evidence	San Diego, CA, United StatesHQ checked Sep 20, 2026	51-200	87 contacts →
	Strong evidence “The San Diego County Air Pollution Control District (District) strives to protect the public from the harmful effects of air pollution, achieve and maintain air quality standards…” Source: RevenueBase Database · checked Sep 20, 2026
21	Water & AIR Research, INC	Indirect evidence	Gainesville, FL, United StatesHQ checked Sep 20, 2026	11-50	87 contacts →
	Indirect evidence “Water and Air Research, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
22	Occupational Services, INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 20, 2026	11-50	74 contacts →
	Indirect evidence “Occupational Services, Incorporated is a San Diego-based professional consulting firm providing services in the areas of environmental compliance, occupational health and safety…” Source: RevenueBase Database · checked Sep 20, 2026
23	Chemicalsafety	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 20, 2026	51-200	67 contacts →
	Indirect evidence “ChemicalSafety provides industry-leading environmental technology for chemical, facility, and hazardous waste management, as well as compliance with local, national and…” Source: RevenueBase Database · checked Sep 20, 2026
24	Aarc Environmental	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	51-200	63 contacts →
	Indirect 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 20, 2026
25	Sage ATC Environmental Consulting	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	201-500	63 contacts →
	Indirect evidence “Sage ATC Environmental Consulting is now Atlas.” Source: RevenueBase Database · checked Sep 20, 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: pollution control 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 pollution control organizations.
Partial evidence: Its own public description names part of pollution control organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name pollution control 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 551 pollution control organizations based in the United States

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Pollution control organizations based in the United States at a glance

As of Sep 20, 2026

26.1%Verified-email coverage

38.1Average contacts per company

1-10Median size (employees)

3.4%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

280

11-50

200

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 551 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 pollution control 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 the United States whose own description of what they do matches “pollution control 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 pollution control 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 pollution control organizations, and records with no verified work email. Companies headquartered outside United States 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, 5,464 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 20, 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.

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 pollution control 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 pollution control organizations are there based in the United States?

RevenueBase identified 551 pollution control organizations headquartered in the 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?

Montrose Environmental Group, headquartered in Little Rock, tops this list with the largest team on record.

Which city has the most pollution control organizations?

Houston leads with 19 headquartered companies, followed by Austin (8) and Seattle (7).

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 5,464 verified decision-maker contacts tracked across these 551 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 20, 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.