Company lists · Data refreshed September 2026

Top 25 Hazmat consulting firms based in the United States

Name: Hazmat consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 1,648 companies tracked

RevenueBase identified 1,648 hazmat consulting firms headquartered in the United States as of September 2026 and tracks 23,023 professional contacts across them, including 9,117 with verified work emails. Houston is the largest hub.

This list covers hazmat consulting firms 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 28, 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 28, 2026 86% judged on-target in blind review

1,648Companies

23,023Contacts tracked

9,117Verified emails

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The 25 largest hazmat consulting firms based in the United States

Ranked by team size

Top 25 of 1,648 hazmat consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to hazmat 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	Total Safety	Indirect evidence	Pasadena, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,650 contacts →
	Indirect evidence “Total Safety is the world's premier provider of integrated safety and compliance services and the products necessary to support them, including gas detection, respiratory…” Source: RevenueBase Database · checked Sep 28, 2026
2	Exponent	Partial evidence	Menlo Park, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,560 contacts →
	Partial evidence “In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…” Source: RevenueBase Database · checked Sep 28, 2026
3	ROUX	Partial evidence	Islandia, NY, United StatesHQ checked Sep 28, 2026	201-500	433 contacts →
	Partial 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 28, 2026
4	Rinchem Company	Indirect evidence	Albuquerque, NM, United StatesHQ checked Sep 28, 2026	1,001-5,000	378 contacts →
	Indirect evidence “Rinchem is the worldwide leader in chemical warehousing, transportation, freight forwarding, and technology.” Source: RevenueBase Database · checked Sep 28, 2026
5	CTEH	Indirect evidence	North Little Rock, AR, United StatesHQ checked Sep 28, 2026	201-500	336 contacts →
	Indirect evidence “CTEH, LLC's purpose is preparing for and responding to a company's or community’s worst day.” Source: RevenueBase Database · checked Sep 28, 2026
6	GSI Environmental INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 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 28, 2026
7	Aftermath Services	Indirect evidence	Aurora, IL, United StatesHQ checked Sep 28, 2026	201-500	257 contacts →
	Indirect evidence “With over 25 years of industry-leading experience, Aftermath Services® is the only trauma and hazard remediation company consistently elevating standards of care and…” Source: RevenueBase Database · checked Sep 28, 2026
8	Labelmaster	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	201-500	212 contacts →
	Indirect evidence “For more than five decades, Labelmaster has been the go-to source for companies – big and small – to navigate and comply with the complex, ever-changing regulations that govern…” Source: RevenueBase Database · checked Sep 28, 2026
9	Hillmann Consulting, LLC	Indirect evidence	Union, NJ, United StatesHQ checked Sep 28, 2026	201-500	209 contacts →
	Indirect evidence “Hillmann has been a well-recognized leader in the Environmental Health & Safety, Due Diligence & Remediation Management, and Construction Services industries since 1985.” Source: RevenueBase Database · checked Sep 28, 2026
10	American Integrated Services, INC	Indirect evidence	Wilimington, United StatesHQ checked Sep 28, 2026	201-500	200 contacts →
	Indirect evidence “American Integrated Services, Inc.(AIS) offers comprehensive solutions through environmental construction and remediation, industrial demolition, abatement, 24/7 emergency…” Source: RevenueBase Database · checked Sep 28, 2026
11	Signature Science, LLC	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	201-500	179 contacts →
	Indirect evidence “Signature Science's consultants serve government and commercial clients through a wide array of technical offerings.” Source: RevenueBase Database · checked Sep 28, 2026
12	Forensic Analytical Consulting Services, INC	Indirect evidence	Hayward, CA, United StatesHQ checked Sep 28, 2026	51-200	172 contacts →
	Indirect evidence “With a staff of over 150 employees in the San Francisco, Sacramento, Los Angeles, San Diego, Modesto, Bakersfield, Fresno, Portland, Chicago, and Grand Rapids offices, Forensic…” Source: RevenueBase Database · checked Sep 28, 2026
13	Environmental Health & Engineering	Indirect evidence	Newton, MA, United StatesHQ checked Sep 28, 2026	51-200	170 contacts →
	Indirect evidence “EH & E delivers integrated environmental, engineering, and health and safety solutions that help businesses and institutions safeguard their assets, improve operations and boost…” Source: RevenueBase Database · checked Sep 28, 2026
14	Cleanair Engineering	Indirect evidence	Palatine, IL, United StatesHQ checked Sep 28, 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 28, 2026
15	Ensolum, LLC	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 28, 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 28, 2026
16	Safe T Professionals, LLC	Partial evidence	Chandler, AZ, United StatesHQ checked Sep 28, 2026	51-200	130 contacts →
	Partial evidence “We are a successful environment health and safety staffing/staff augmentation and consulting firm with services available worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
17	Secorp Industries	Indirect evidence	Lafayette, LA, United StatesHQ checked Sep 28, 2026	501-1,000	126 contacts →
	Indirect evidence “Secorp Industries began in 1972 and is a safety company providing Respiratory Protection, Gas Monitoring and Detection, Rescue Services, Safety/Medical Consultants and Training to…” Source: RevenueBase Database · checked Sep 28, 2026
18	GFA International, INC	Partial evidence	Delray Beach, FL, United StatesHQ checked Sep 28, 2026	51-200	115 contacts →
	Partial evidence “GFA International, Inc.(GFA) is a full-service Engineering consulting organization providing Environmental Consulting, Geotechnical Engineering, Construction Materials Testing…” Source: RevenueBase Database · checked Sep 28, 2026
19	Cleaning Guys, LLC	Partial evidence	Fort Worth Tx, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	115 contacts →
	Partial evidence “CG, an EnviroServe Company (CG), founded in 1992, is a full-service environmental and hazmat cleanup company.” Source: RevenueBase Database · checked Sep 28, 2026
20	The EI Group, INC	Partial evidence	Morrisville, NC, United StatesHQ checked Sep 28, 2026	51-200	111 contacts →
	Partial evidence “The EI Group, Inc.(EI) is an environmental, health and safety consulting firm headquartered in Research Triangle Park, North Carolina, with branch offices strategically located…” Source: RevenueBase Database · checked Sep 28, 2026
21	ALLOY	Indirect evidence	Export, PA, United StatesHQ checked Sep 28, 2026	501-1,000	108 contacts →
	Indirect evidence “Alloy performs demolition and environmental hazard remediation services for some of the nation’s leading firms, institutions, and government agencies.” Source: RevenueBase Database · checked Sep 28, 2026
22	Fire & Risk Alliance, LLC	Indirect evidence	Washington Dc, MD, United StatesHQ checked Sep 28, 2026	51-200	106 contacts →
	Indirect evidence “The Fire & Risk Alliance was created under four basic principles: TRUST – To be our clients trusted partner in maintaining and improving safety.” Source: RevenueBase Database · checked Sep 28, 2026
23	Miller Environmental, INC	Indirect evidence	Orange, CA, United StatesHQ checked Sep 28, 2026	201-500	106 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
24	Innovative Construction Solutions	Indirect evidence	Costa Mesa, CA, United StatesHQ checked Sep 28, 2026	51-200	103 contacts →
	Indirect evidence “Innovative Construction Solutions (ICS) is a general engineering contractor with hazardous waste removal and demolition endorsements licensed in the State of California (License…” Source: RevenueBase Database · checked Sep 28, 2026
25	Amerisafe Group	Partial evidence	Greensburg, PA, United StatesHQ checked Sep 28, 2026	51-200	99 contacts →
	Partial evidence “With offices in Pittsburgh, Roselle, and Chicago, Amerisafe Group, offers full-service safety consulting, training, rescue, and occupational health services for all types of…” Source: RevenueBase Database · checked Sep 28, 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: hazmat 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 hazmat consulting firms.
Partial evidence: Its own public description names part of hazmat consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hazmat 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 1,648 hazmat consulting firms based in the United States

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Hazmat consulting firms based in the United States at a glance

As of Sep 28, 2026

39.6%Verified-email coverage

14.0Average contacts per company

1-10Median size (employees)

3.3%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

890

11-50

543

51-200

159

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 1,648 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 hazmat 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 the United States whose own description of what they do matches “hazmat 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 hazmat 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 hazmat consulting firms, 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, 9,117 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 28, 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.

Hazmat consulting firms by metro

Hazmat consulting firms in Houston55

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 hazmat 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 hazmat consulting firms are there based in the United States?

RevenueBase identified 1,648 hazmat consulting firms 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?

Total Safety, headquartered in Pasadena, tops this list with the largest team on record.

Which city has the most hazmat consulting firms?

Houston leads with 55 headquartered companies, followed by San Diego (24) and New York (21).

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 9,117 verified decision-maker contacts tracked across these 1,648 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 28, 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.