Company lists · Data refreshed September 2026

Top 25 Hazmat compliance consulting firms based in the United States

Name: Hazmat compliance 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 975 companies tracked

RevenueBase identified 975 hazmat compliance consulting firms headquartered in the United States as of September 2026 and tracks 10,545 professional contacts across them, including 4,220 with verified work emails. Houston is the largest hub.

This list covers hazmat compliance 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

975Companies

10,545Contacts tracked

4,220Verified emails

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The 25 largest hazmat compliance consulting firms based in the United States

Ranked by team size

Top 25 of 975 hazmat compliance 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 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	Total Safety	Partial evidence	Pasadena, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,650 contacts →
	Partial 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	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
3	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
4	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
5	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
6	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
7	Chambers Group, INC	Partial evidence	Costa Mesa, CA, United StatesHQ checked Sep 28, 2026	51-200	98 contacts →
	Partial 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 28, 2026
8	Yorke Engineering, LLC	Indirect evidence	San Juan Capistrano, CA, United StatesHQ checked Sep 28, 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 28, 2026
9	Environmental Standards Montrose Environmental Group	Indirect evidence	Valley Forge, PA, United StatesHQ checked Sep 28, 2026	51-200	83 contacts →
	Indirect evidence “Environmental Standards is now part of Onterris.” Source: RevenueBase Database · checked Sep 28, 2026
10	Insight Environmental, INC	Partial evidence	Spring, TX, United StatesHQ checked Sep 28, 2026	51-200	80 contacts →
	Partial evidence “Insight Environmental is an environmental consulting firm founded on education, experience, and expertise.” Source: RevenueBase Database · checked Sep 28, 2026
11	ISI Environmental	Indirect evidence	Wichita, KS, United StatesHQ checked Sep 28, 2026	51-200	79 contacts →
	Indirect evidence “iSi provides environmental, health and safety facility support services to a wide variety of industries across the U.S.” Source: RevenueBase Database · checked Sep 28, 2026
12	Hazmat Environmental Group, INC	Indirect evidence	Buffalo, NY, United StatesHQ checked Sep 28, 2026	201-500	75 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
13	Occupational Services, INC	Strong evidence	San Diego, CA, United StatesHQ checked Sep 28, 2026	11-50	74 contacts →
	Strong 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 28, 2026
14	SES Environmental	Partial evidence	Fort Wayne, IN, United StatesHQ checked Sep 28, 2026	11-50	73 contacts →
	Partial evidence “We are a full service EH & S consulting and contracting firm based in the Midwestern United States, serving companies throughout the world.” Source: RevenueBase Database · checked Sep 28, 2026
15	Chemicalsafety	Partial evidence	Las Vegas, NV, United StatesHQ checked Sep 28, 2026	51-200	67 contacts →
	Partial 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 28, 2026
16	IES Safety, LLC	Partial evidence	Louisville, KY, United StatesHQ checked Sep 28, 2026	201-500	65 contacts →
	Partial evidence “IES Safety, LLC delivers expert occupational safety and health consulting through seasoned professionals who help clients proactively manage risk and maintain regulatory…” Source: RevenueBase Database · checked Sep 28, 2026
17	Aarc Environmental	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	51-200	63 contacts →
	Partial 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 28, 2026
18	RCP INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 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 28, 2026
19	LEW Environmental	Partial evidence	Mine Hill, NJ, United StatesHQ checked Sep 28, 2026	51-200	59 contacts →
	Partial evidence “THE ENVIRONMENTAL COMPANY LEW Environmental Services is proud to be part of the Mainline Environmental family of companies, alongside our sister organizations HSE Consulting and…” Source: RevenueBase Database · checked Sep 28, 2026
20	Signature Safety, LLC	Partial evidence	Shrewsbury, NJ, United StatesHQ checked Sep 28, 2026	11-50	58 contacts →
	Partial evidence “Signature Safety is a mid-sized EHS Consulting firm, with experience & education brought to it by its founders that stretches back over 30 years.” Source: RevenueBase Database · checked Sep 28, 2026
21	Whitman	Strong evidence	Somerset, NJ, United StatesHQ checked Sep 28, 2026	11-50	57 contacts →
	Strong evidence “Whitman is a full-service environmental, engineering, energy, waste management and EH & S compliance consulting firm with more than 37 years of professional experience.” Source: RevenueBase Database · checked Sep 28, 2026
22	Safex INC	Indirect evidence	Westerville, OH, United StatesHQ checked Sep 28, 2026	11-50	57 contacts →
	Indirect evidence “We are committed to the total wellbeing of your employees.” Source: RevenueBase Database · checked Sep 28, 2026
23	SRP Environmental	Indirect evidence	Shreveport, LA, United StatesHQ checked Sep 28, 2026	51-200	57 contacts →
	Indirect evidence “Our Mission: SRP Environmental specializes in providing the highest quality, ethical, and economical solutions by industry experts for the protection of human health and…” Source: RevenueBase Database · checked Sep 28, 2026
24	Carnow, Conibear & Assoc., LTD	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	11-50	52 contacts →
	Indirect evidence “Carnow, Conibear & Assoc, Ltd.(Carnow Conibear), a minority-owned, woman-owned and veteran-owned business, was established in 1975.” Source: RevenueBase Database · checked Sep 28, 2026
25	Etech Environmental & Safety Solutions INC	Indirect evidence	Odessa, TX, United StatesHQ checked Sep 28, 2026	51-200	52 contacts →
	Indirect evidence “Founded in 2003, the Etech Team is well qualified to conduct all aspects of environmental and safety management to meet your firms needs.” 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 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 hazmat compliance consulting firms.
Partial evidence: Its own public description names part of hazmat 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 hazmat 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 975 hazmat compliance consulting firms based in the United States

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Hazmat compliance consulting firms based in the United States at a glance

As of Sep 28, 2026

40.0%Verified-email coverage

10.8Average contacts per company

1-10Median size (employees)

3.6%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

608

11-50

292

51-200

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 975 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 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 the United States whose own description of what they do matches “hazmat 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 hazmat 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 hazmat compliance 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, 4,220 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 compliance consulting firms by metro

Hazmat compliance consulting firms in Houston35

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

RevenueBase identified 975 hazmat compliance 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 compliance consulting firms?

Houston leads with 35 headquartered companies, followed by San Diego (12) and Chicago (11).

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 4,220 verified decision-maker contacts tracked across these 975 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.