Company lists · Data refreshed September 2026

Top 25 Industrial compliance consulting firms based in the United States

Name: Industrial 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 2,920 companies tracked

RevenueBase identified 2,920 industrial compliance consulting firms headquartered in the United States as of September 2026 and tracks 31,789 professional contacts across them, including 12,735 with verified work emails. Houston is the largest hub.

This list covers industrial 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

2,920Companies

31,789Contacts tracked

12,735Verified emails

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

Ranked by team size

Top 25 of 2,920 industrial 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 industrial 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	Alliance Technical Group	Indirect evidence	Decatur, AL, United StatesHQ checked Sep 28, 2026	1,001-5,000	956 contacts →
	Indirect 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 28, 2026
2	CT Corporation	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	788 contacts →
	Partial evidence “CT Corporation helps small businesses, corporations, and law firms around the world manage their most critical business and legal compliance responsibilities.” Source: RevenueBase Database · checked Sep 28, 2026
3	Antea Group USA	Partial evidence	St Paul, MN, United StatesHQ checked Sep 28, 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 28, 2026
4	GSA National	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	201-500	558 contacts →
	Partial evidence “GSA National has been helping government contractors ensure compliance and streamline costs since 1991.” Source: RevenueBase Database · checked Sep 28, 2026
5	Enhesa	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	201-500	474 contacts →
	Partial evidence “At Enhesa we empower the world’s largest businesses to achieve compliance, manage risk, and drive sustainability with clear, actionable insights.” Source: RevenueBase Database · checked Sep 28, 2026
6	Groundwater & Environmental Services, INC	Indirect evidence	Wall Township, NJ, United StatesHQ checked Sep 28, 2026	201-500	447 contacts →
	Indirect evidence “We are Groundwater & Environmental Services, Inc, better known as GES.” Source: RevenueBase Database · checked Sep 28, 2026
7	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
8	P2s	Indirect evidence	Long Beach, CA, United StatesHQ checked Sep 28, 2026	201-500	375 contacts →
	Indirect evidence “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Source: RevenueBase Database · checked Sep 28, 2026
9	APA Engineering INC	Partial evidence	Mount Laurel, NJ, United StatesHQ checked Sep 28, 2026	201-500	364 contacts →
	Partial evidence “APA Engineering Inc has been a leader in providing Compliance, Engineering, IT, and Sourcing services since With over twenty years in business, we are dedicated to providing the…” Source: RevenueBase Database · checked Sep 28, 2026
10	Protect LLC	Partial evidence	Wichita, KS, United StatesHQ checked Sep 28, 2026	501-1,000	332 contacts →
	Partial evidence “PROtect is a leading national provider of reliability, risk, and compliance services to the refining, petrochemical, renewable fuels, manufacturing, food & beverage, fertilizer…” Source: RevenueBase Database · checked Sep 28, 2026
11	All4	Partial evidence	Kimberton, PA, United StatesHQ checked Sep 28, 2026	201-500	331 contacts →
	Partial evidence “ALL4 is a global consulting firm committed to shaping a sustainable future through innovative environmental, health, and safety (EHS) and digital solutions.” Source: RevenueBase Database · checked Sep 28, 2026
12	Registrar Corp	Partial evidence	Hampton, VA, United StatesHQ checked Sep 28, 2026	51-200	317 contacts →
	Partial evidence “Registrar Corp is your trusted partner helping you navigate global regulatory requirements with expert services, innovative software solutions and comprehensive online compliance…” Source: RevenueBase Database · checked Sep 28, 2026
13	Hyde Engineering Consulting	Partial evidence	Louisville, CO, United StatesHQ checked Sep 28, 2026	201-500	253 contacts →
	Partial evidence “Hyde E+C is an international engineering consulting firm that helps companies operate more efficiently, get products to market more quickly, meet regulatory requirements more…” Source: RevenueBase Database · checked Sep 28, 2026
14	Tanknology	Partial evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	201-500	232 contacts →
	Partial evidence “Tanknology is the world's largest provider of tank testing and environmental compliance services for petroleum systems.” Source: RevenueBase Database · checked Sep 28, 2026
15	August Mack Environmental, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 28, 2026	51-200	210 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
16	Hillmann Consulting, LLC	Partial evidence	Union, NJ, United StatesHQ checked Sep 28, 2026	201-500	209 contacts →
	Partial 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
17	Tradewin	Indirect evidence	Peabody, MA, United StatesHQ checked Sep 28, 2026	201-500	189 contacts →
	Indirect evidence “Tradewin, established in 1997, is a leading provider of import and export advice worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
18	Milrose Consultants	Strong evidence	New York, NY, United StatesHQ checked Sep 28, 2026	201-500	174 contacts →
	Strong evidence “Milrose is the nation’s premier building lifecycle firm, offering fully integrated services in Permitting, Code Consulting, Municipal Compliance, Special Inspections…” Source: RevenueBase Database · checked Sep 28, 2026
19	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
20	Ecorp Consulting, INC	Indirect evidence	Rocklin, CA, United StatesHQ checked Sep 28, 2026	51-200	166 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
21	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
22	Harbor Compliance	Partial evidence	Lancaster, PA, United StatesHQ checked Sep 28, 2026	201-500	150 contacts →
	Partial evidence “We provide innovative compliance solutions by embracing complexity and making it simple.” Source: RevenueBase Database · checked Sep 28, 2026
23	Qualspec	Partial evidence	Deer Park, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	149 contacts →
	Partial evidence “QualSpec is a leading industrial inspection firm headquartered in Houston, Texas.” Source: RevenueBase Database · checked Sep 28, 2026
24	Trendsource, INC	Partial evidence	San Diego, CA, United StatesHQ checked Sep 28, 2026	11-50	141 contacts →
	Partial evidence “TrendSource helps businesses document and measure compliance across employment, consumer reporting, government, finance, health care, and retail.” Source: RevenueBase Database · checked Sep 28, 2026
25	Mostardi Platt	Indirect evidence	Elmhurst, IL, United StatesHQ checked Sep 28, 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 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: industrial 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 industrial compliance consulting firms.
Partial evidence: Its own public description names part of industrial 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 industrial 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 2,920 industrial compliance consulting firms based in the United States

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

As of Sep 28, 2026

40.1%Verified-email coverage

10.9Average contacts per company

1-10Median size (employees)

3.0%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,908

11-50

793

51-200

166

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 2,920 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 industrial 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 “industrial 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 industrial 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 industrial 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, 12,735 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.

Industrial compliance consulting firms by metro

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

RevenueBase identified 2,920 industrial 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?

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

Which city has the most industrial compliance consulting firms?

Houston leads with 87 headquartered companies, followed by New York (65) and Dallas (32).

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 12,735 verified decision-maker contacts tracked across these 2,920 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.