Company lists · Data refreshed September 2026

Top 25 Compliance and environmental consulting firms based in Houston, United States

Name: Compliance and environmental consulting firms based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 188 companies tracked

RevenueBase identified 188 company matches for compliance and environmental consulting firms associated with Houston, United States as of September 2026 and tracks 3,697 professional contacts across them, including 1,404 with verified work emails. Across the United States, Houston is the largest hub for this category.

This list covers company matches for compliance and environmental consulting firms associated with Houston, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 27, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 27, 2026 How this list was built

188Companies

3,697Contacts tracked

1,404Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest compliance and environmental consulting firms based in Houston, United States

Ranked by team size

Top 25 of 188 company matches for compliance and environmental consulting firms based in Houston, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 27, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	VLS Environmental Solutions, LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	1,001-5,000	481 contacts →
	Exact match “At VLS, we address your company’s most significant hurdles with waste management and compliance through sustainable solutions.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
2	SPL	Exact match	Houston, United StatesHQ recorded Sep 27, 2026	501-1,000	442 contacts →
	Exact match “SPL is a leading provider of compliance and testing services for Environmental, Energy, and other end markets.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
3	GSI Environmental INC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	201-500	259 contacts →
	Exact match “GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
4	NEW Tech Global	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	51-200	245 contacts →
	Exact match “New Tech Global (NTG) is comprised of 5 different business units: New Tech Global Ventures: Upstream Oil & Gas consultancy services, and W-2 professional placement services for…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
5	Shah Smith & Associates, INC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	51-200	134 contacts →
	Exact match “Shah Smith & Associates, Inc.(SSA) is a 120+ employee Mechanical, Electrical, and Plumbing (MEP) consulting engineering firm with offices in Houston, Austin & Dallas.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
6	Milestone Environmental	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	201-500	128 contacts →
	Exact match “Milestone Environmental is a leading environmental infrastructure and services company delivering reliable, safe, compliant and best-in-class waste management solutions.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
7	Edge Engineering And Science, LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	51-200	116 contacts →
	Exact match “Edge Engineering & Science, LLC (EDGE) is a privately owned professional services firm headquartered in Houston, Texas.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
8	Perennial Environmental Services	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	51-200	102 contacts →
	Exact match “Perennial Environmental Services, LLC, has been providing technical environmental solutions and management with fresh perspectives and unparalleled efficiency since 2003.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
9	Climeco	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	51-200	96 contacts →
	Exact match “ClimeCo is an award-winning leader in decarbonization, empowering global organizations with customized sustainability pathways.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
10	Aarc Environmental	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	51-200	63 contacts →
	Exact match “As a leader in the environmental compliance services industry, AARC does more than just meeting the needs of clients today.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
11	RCP INC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	51-200	63 contacts →
	Exact match “RCP is the regulatory compliance and risk management expert for pipelines, facilities, and terminal operations.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
12	Sage ATC Environmental Consulting	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	201-500	63 contacts →
	Exact match “Sage ATC Environmental Consulting is now Atlas.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
13	Spirit Environmental Montrose Environmental Group	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	51-200	54 contacts →
	Exact match “In July of 2024, Spirit was acquired by Onterris.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
14	Pilko & Associates	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	11-50	50 contacts →
	Exact match “We are the trusted Advisor to corporate officers and boards on mitigating Operational/EHS Risks and unlocking value for global energy, chemical and industrial companies.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
15	International Safety Systems, INC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	11-50	46 contacts →
	Exact match “International Safety Systems, Inc.(ISS) is a consulting company providing cost effective and high quality industrial hygiene and safety services to 35+ countries from its offices…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
16	Enersafe INC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	201-500	43 contacts →
	Exact match “Headquartered in Houston, TX, and already with six locations across the major petroleum plays of the U.S, EnerSafe is a growing industry presence in our four core…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
17	J Connor Consulting, INC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	51-200	39 contacts →
	Exact match “The Company J.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
18	RSB Environmental, An Alliance Technical Group Company	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	11-50	38 contacts →
	Exact match “RSB Environmental, an Alliance Technical Group company, is a full-service environmental engineering consulting firm, specializing in environmental health and safety services and…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
19	Phase Engineering, LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	11-50	34 contacts →
	Exact match “Phase Engineering, LLC, was founded in 1993 and is a leading engineering and environmental consulting firm, serving clients nationwide to deliver trusted environmental solutions.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
20	Hollaway Environmental Communications Services, INC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	11-50	33 contacts →
	Exact match “Hollaway Environmental + Communication Services, an SBE/DBE/WBE/HUB firm, bridges two worlds that are uniquely connected: Environmental Services and Communications Services.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
21	UES Professional Solutions 64, LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	11-50	31 contacts →
	Exact match “Environmental Consulting and Engineering InControl Technologies was established in 1997 to provide high-end quality environmental consulting services to owners of commercial and…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
22	Credo Services LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	11-50	23 contacts →
	Exact match “DGPS / Survey • Tool Tracking • Tool Decontamination/NORM License/Waste Disposal • Dig Locates • Abandoned Pipeline Recovery • Environmental Services • Pipe Sales • Project…” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
23	Enserv Solutions	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	11-50	23 contacts →
	Exact match “At EnServ Solutions, we offer a wide variety of services to aid operators in maintaining compliance with 49 CFR 192 and 195 regulations as well as various state partners.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
24	HSE International LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	11-50	23 contacts →
	Exact match “HSE International provides environmental, social, safety and strategic advisory services to the energy, infrastructure, extractive, financial and government sectors.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
25	Acorn International, LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 27, 2026	11-50	22 contacts →
	Exact match “Acorn International, LLC delivers environmental and social risk management consulting services to international industry and investors.” Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “compliance and environmental consulting firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 188 compliance and environmental consulting firms based in Houston, United States

See the full list, filter by size, metro and specialty, and access 1,404 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Compliance and environmental consulting firms based in Houston, United States at a glance

As of Sep 27, 2026

38.0%Verified-email coverage

19.7Average contacts per company

1-10Median size (employees)

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

105

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 188 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Houston, United States whose business descriptions match “compliance and environmental consulting firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 1,404 professional contacts with verified work emails across the full matched dataset. 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 27, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Compliance and environmental consulting firms by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “compliance and environmental consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many compliance and environmental consulting firms are there based in Houston, United States?

RevenueBase identified 188 company matches for compliance and environmental consulting firms associated with Houston, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

VLS Environmental Solutions, LLC tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most compliance and environmental consulting firms?

Houston leads the United States with 188 company records, followed by New York (163) and Denver (84).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 1,404 professional contacts with verified work emails tracked across these 188 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 27, 2026.

Ready to reach these companies? Verified emails and direct dials for all 188 compliance and environmental consulting firms based in Houston, United States. Start with a free account, no credit card.

Download this list →

Related lists

Compliance and environmental consulting firms by geography

Browse the directory

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 SmartSearch, 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.