Company lists · Data refreshed September 2026

Top 25 Automotive environmental compliance consultants based in the United States

Name: Automotive environmental compliance consultants based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 405 companies tracked

RevenueBase identified 405 automotive environmental compliance consultants headquartered in the United States as of September 2026 and tracks 5,881 professional contacts across them, including 2,524 with verified work emails. Houston is the largest hub.

This list covers automotive environmental compliance consultants 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 30, 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 30, 2026 86% judged on-target in blind review

405Companies

5,881Contacts tracked

2,524Verified emails

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The 25 largest automotive environmental compliance consultants based in the United States

Ranked by team size

Top 25 of 405 automotive environmental compliance consultants based in the United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to automotive environmental compliance consultants: 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	Alliance Technical Group	Partial evidence	Decatur, AL, United StatesHQ checked Sep 30, 2026	1,001-5,000	956 contacts →
	Partial evidence “Alliance is a new kind of environmental services company-powered by innovation, focused on service, and committed to client success.” Source: RevenueBase Database · checked Sep 30, 2026
2	Antea Group USA	Partial evidence	St. Paul, MN, United StatesHQ checked Sep 30, 2026	1,001-5,000	658 contacts →
	Partial evidence “Antea Group is an international engineering and environmental consulting firm specializing in full-service solutions in the fields of environment, health and safety, and…” Source: RevenueBase Database · checked Sep 30, 2026
3	Metiri Group	Partial evidence	Clovis, CA, United StatesHQ checked Sep 30, 2026	n/a	233 contacts →
	Partial evidence “Appl Inc is an environmental services company based out of 908 N Temperance Ave, Clovis, CA, United States.” Source: RevenueBase Database · checked Sep 30, 2026
4	Cleanair Engineering	Indirect evidence	Palatine, IL, United StatesHQ checked Sep 30, 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 30, 2026
5	Quest Resource Management Group, A Qrhc Company Nasdaq Qrhc	Partial evidence	The Colony, TX, United StatesHQ checked Sep 30, 2026	51-200	147 contacts →
	Partial evidence “Quest Resource Management Group, a subsidiary of Quest Resource Holding Corporation (Nasdaq: QRHC), is a full-service environmental consulting and management company headquartered…” Source: RevenueBase Database · checked Sep 30, 2026
6	Mostardi Platt	Partial evidence	Elmhurst, IL, United StatesHQ checked Sep 30, 2026	51-200	140 contacts →
	Partial 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 30, 2026
7	Chambers Group, INC	Strong evidence	Costa Mesa, CA, United StatesHQ checked Sep 30, 2026	51-200	98 contacts →
	Strong 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 30, 2026
8	A-Tech Consulting, INC	Indirect evidence	Orange, CA, United StatesHQ checked Sep 30, 2026	51-200	97 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
9	Cgrs INC	Indirect evidence	Fort Collins, CO, United StatesHQ checked Sep 30, 2026	51-200	70 contacts →
	Indirect evidence “We deliver quality solutions with integrity and expertise, every time.” Source: RevenueBase Database · checked Sep 30, 2026
10	Aarc Environmental	Strong evidence	Houston, TX, United StatesHQ checked Sep 30, 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 30, 2026
11	Sage ATC Environmental Consulting	Partial evidence	Houston, TX, United StatesHQ checked Sep 30, 2026	201-500	63 contacts →
	Partial evidence “Sage ATC Environmental Consulting is now Atlas.” Source: RevenueBase Database · checked Sep 30, 2026
12	Whitman	Strong evidence	Somerset, NJ, United StatesHQ checked Sep 30, 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 30, 2026
13	ONE Environmental Group, LLC	Partial evidence	Midlothian, VA, United StatesHQ checked Sep 30, 2026	11-50	52 contacts →
	Partial evidence “ONE offers environmental consulting and industrial services to commercial, industrial, and government clients that are regulated by environmental state and federal regulations or…” Source: RevenueBase Database · checked Sep 30, 2026
14	Carnow, Conibear & Assoc., LTD	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 30, 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 30, 2026
15	GEL Engineering, LLC	Partial evidence	Charleston, SC, United StatesHQ checked Sep 30, 2026	51-200	52 contacts →
	Partial evidence “GEL Engineering and GEL Engineering of NC provide environmental, engineering, surveying, and emissions testing services to our valued clients throughout the southeast and beyond.” Source: RevenueBase Database · checked Sep 30, 2026
16	Spheros Environmental	Partial evidence	Denver, CO, United StatesHQ checked Sep 30, 2026	201-500	48 contacts →
	Partial evidence “Environmental insight for complex real-world decisions Spheros Environmental helps clients make clear, defensible decisions in complex environments.” Source: RevenueBase Database · checked Sep 30, 2026
17	7g Environmental Compliance Management	Strong evidence	Tallahassee, FL, United StatesHQ checked Sep 30, 2026	51-200	48 contacts →
	Strong evidence “7G Environmental Compliance Management (7G) is an environmental consulting firm headquartered in Tallahassee, Florida.” Source: RevenueBase Database · checked Sep 30, 2026
18	Enviroservices & Training Center	Strong evidence	Honolulu, HI, United StatesHQ checked Sep 30, 2026	51-200	44 contacts →
	Strong evidence “We Are a Full-Service Environmental Consultancy.” Source: RevenueBase Database · checked Sep 30, 2026
19	Aeterra, LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 30, 2026	11-50	43 contacts →
	Partial evidence “Aeterra is a full-service environmental and sustainability consulting firm that provides operating businesses and their owners with meaningful, practical, business-focused advice.” Source: RevenueBase Database · checked Sep 30, 2026
20	GSS INC	Strong evidence	Urbandale, IA, United StatesHQ checked Sep 30, 2026	11-50	41 contacts →
	Strong evidence “For more than two decades, GSS has been providing comprehensive environmental and compliance services to a variety of industries.” Source: RevenueBase Database · checked Sep 30, 2026
21	ACC Environmental Consultants	Strong evidence	Oakland, CA, United StatesHQ checked Sep 30, 2026	51-200	41 contacts →
	Strong evidence “Established in 1986, ACC Environmental Consultants, Inc.(ACC) is an employee-owned full service environmental consulting and design firm recognized for its excellent and reliable…” Source: RevenueBase Database · checked Sep 30, 2026
22	ECCI	Strong evidence	Little Rock, AR, United StatesHQ checked Sep 30, 2026	11-50	40 contacts →
	Strong evidence “We are a privately-owned engineering and environmental consulting firm that provide efficient engineering and environmental compliance solutions to a variety of industries and…” Source: RevenueBase Database · checked Sep 30, 2026
23	Sapphos Environmental, INC	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 30, 2026	11-50	39 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
24	Vert Environmental	Partial evidence	San Diego, CA, United StatesHQ checked Sep 30, 2026	11-50	39 contacts →
	Partial evidence “We are a green environmental testing and consulting firm, dedicated to providing the highest level of customer service available in the industry.” Source: RevenueBase Database · checked Sep 30, 2026
25	Peak Environmental, A Nova Group, GBC Company	Partial evidence	East Brunswick, NJ, United StatesHQ checked Sep 30, 2026	11-50	38 contacts →
	Partial evidence “Peak Environmental, A Nova Group, GBC Company (Peak) is a full-service, forward-thinking environmental consulting firm serving clients from the petroleum, industrial, financial…” Source: RevenueBase Database · checked Sep 30, 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: automotive environmental compliance consultants. 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 automotive environmental compliance consultants.
Partial evidence: Its own public description names part of automotive environmental compliance consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name automotive environmental compliance consultants. 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 405 automotive environmental compliance consultants based in the United States

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Automotive environmental compliance consultants based in the United States at a glance

As of Sep 30, 2026

42.9%Verified-email coverage

14.5Average contacts per company

1-10Median size (employees)

4.0%Largest-city concentration · Houston

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

242

11-50

135

51-200

201-500

1,001-5,000

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 405 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 automotive environmental compliance consultants, 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 “automotive environmental compliance consultants”. 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 automotive environmental compliance consultants), 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 automotive environmental compliance consultants, 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, 2,524 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 30, 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 automotive environmental compliance consultants, 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 automotive environmental compliance consultants are there based in the United States?

RevenueBase identified 405 automotive environmental compliance consultants 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?

Alliance Technical Group, headquartered in Decatur, tops this list with the largest team on record.

Which city has the most automotive environmental compliance consultants?

Houston leads with 16 headquartered companies, followed by New York (6) and Austin (5).

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 2,524 verified decision-maker contacts tracked across these 405 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 30, 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.