Company lists · Data refreshed November 2026

Top 25 Oil and gas environmental services based in the United States

Name: Oil and gas environmental services based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 4, 2026 5,660 companies tracked

RevenueBase identified 5,660 company matches for oil and gas environmental services associated with the United States as of November 2026 and tracks 189,253 professional contacts across them, including 64,273 with verified work emails. Houston is the largest hub.

This list covers company matches for oil and gas environmental services associated with the 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 November 4, 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 Nov 4, 2026 How this list was built

5,660Companies

189,253Contacts tracked

64,273Verified emails

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The 25 largest oil and gas environmental services based in the United States

Ranked by team size

Top 25 of 5,660 company matches for oil and gas environmental services based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 4, 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	Clean Harbors	Exact match	Norwell, MA, United StatesHQ recorded Nov 4, 2026	10001+	9,552 contacts →
	Exact match “Clean Harbors is North America’s leading provider of environmental and industrial services.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
2	NESR	Exact match	Houston, United StatesHQ recorded Nov 4, 2026	5,001-10,000	3,989 contacts →
	Exact match “National Energy Services Reunited Corp.(NESR) was founded in 2017 as one of the largest national oilfield services providers in the MENA and Asia Pacific regions and was the first…” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
3	KEY Energy Services	Exact match	Houston, TX, United StatesHQ recorded Nov 4, 2026	1,001-5,000	2,991 contacts →
	Exact match “Headquartered in Houston, Texas, Key Energy Services provides a wide array of leading edge energy production solutions and services.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
4	Safety-Kleen	Exact match	Plano, TX, United StatesHQ recorded Nov 4, 2026	1,001-5,000	2,988 contacts →
	Exact match “Safety-Kleen is a leading environmental services company engaged in used oil recycling and refining (EcoPower brand), parts cleaning and other responsible environmental solutions.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
5	Langan Engineering & Environmental Services	Exact match	Parsippany, TN, United StatesHQ recorded Nov 4, 2026	1,001-5,000	2,492 contacts →
	Exact match “Langan's client-focused, highly entrepreneurial culture cultivates an environment of opportunities in which career growth and teamwork flourish.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
6	Civil & Environmental Consultants, INC	Exact match	Moon Township, MO, United StatesHQ recorded Nov 4, 2026	1,001-5,000	2,276 contacts →
	Exact match “Civil & Environmental Consultants, Inc.(CEC) provides comprehensive market-oriented consulting services that advance the strategic business objectives of its clients.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
7	Providence	Exact match	Baton Rouge, LA, United StatesHQ recorded Nov 4, 2026	n/a	2,268 contacts →
	Exact match “Providence is an employee-owned engineering and environmental consulting firm.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
8	Superior Energy Services	Exact match	Houston, TX, United StatesHQ recorded Nov 4, 2026	1,001-5,000	2,119 contacts →
	Exact match “For oil & gas exploration and production companies worldwide, Superior Energy Services is an oilfield products and services company with global reach, financial stability and…” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
9	OIL States International	Exact match	Houston, TX, United StatesHQ recorded Nov 4, 2026	5,001-10,000	1,831 contacts →
	Exact match “Oil States International, Inc.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
10	T.D. Williamson	Exact match	Tulsa, OK, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,781 contacts →
	Exact match “T.D.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
11	Swca Environmental Consultants	Exact match	Phoenix, MA, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,695 contacts →
	Exact match “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
12	Halliburton Energy Services	Exact match	Houston, TX, United StatesHQ recorded Nov 4, 2026	10001+	1,610 contacts →
	Exact match “Founded in 1919, Halliburton is one of the world’s largest providers of products and services to the energy industry.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
13	Atwell, LLC	Exact match	Southfield, MI, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,561 contacts →
	Exact match “Atwell is a full-service consulting, engineering and construction services firm that delivers a broad range of creative solutions to clients in the real estate and land…” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
14	Select Water Solutions	Exact match	Gainesville, TX, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,561 contacts →
	Exact match “Select is a leader in water management and chemical technology to our customers in the oil and gas industry, as well as in other industrial applications.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
15	Weston Solutions, INC	Exact match	West Chester, PA, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,559 contacts →
	Exact match “Weston Solutions, Inc.(Weston) is a 100% employee-owned environmental and infrastructure services firm committed to safety and providing measurable client value.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
16	Partner Engineering & Science, INC	Exact match	Torrance, WA, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,481 contacts →
	Exact match “Partner Assessment Corp.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
17	PMI	Exact match	Irvine, CA, United StatesHQ recorded Nov 4, 2026	n/a	1,371 contacts →
	Exact match “Training and Development Solutions” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
18	Forum Energy Technologies	Exact match	Houston, TX, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,366 contacts →
	Exact match “FET (Forum Energy Technologies, Inc.) is a global company, serving the crude oil, natural gas, and renewable energy industries.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
19	Cudd Energy Services	Exact match	The Woodlands, TX, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,359 contacts →
	Exact match “Cudd offers a broad range of technical and specialized oilfield services to companies engaged in the exploration and production of oil and natural gas worldwide.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
20	US Ecology Inc., A Republic Services Company	Exact match	Boise, MI, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,330 contacts →
	Exact match “US Ecology is a Republic Services company.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
21	Apex Companies	Exact match	Rockville, MD, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,321 contacts →
	Exact match “Who is Apex?” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
22	Newpark	Exact match	Katy, TX, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,303 contacts →
	Exact match “Newpark Fluids Systems is the world’s leading pure-play oil & gas and geothermal fluid solutions provider.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
23	Barr Engineering CO	Exact match	Minneapolis, NV, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,146 contacts →
	Exact match “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
24	Trinity Consultants	Exact match	Dallas, TX, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,114 contacts →
	Exact match “Trinity Consultants is a global team of specialists helping organizations solve complex challenges in environmental compliance, ecological protection, infrastructure and built…” Recorded in the RevenueBase company graph · Nov 4, 2026 · View company records in RevenueBase
25	Alliance Technical Group	Exact match	Decatur, PA, United StatesHQ recorded Nov 4, 2026	1,001-5,000	1,088 contacts →
	Exact match “Alliance is a new kind of environmental services company-powered by innovation, focused on service, and committed to client success.” Recorded in the RevenueBase company graph · Nov 4, 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 “oil and gas environmental services”. 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 5,660 oil and gas environmental services based in the United States

See the full list, filter by size, metro and specialty, and access 64,273 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Oil and gas environmental services based in the United States at a glance

As of Nov 4, 2026

34.0%Verified-email coverage

33.4Average contacts per company

11-50Median size (employees)

8.9%Largest-city concentration · Houston

Nov 4, 2026Page data refreshed

Companies by employee count

1-10

2,303

11-50

2,003

51-200

916

201-500

240

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 5,660 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 the United States whose business descriptions match “oil and gas environmental services” 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 64,273 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 November 4, 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.

Oil and gas environmental services by metro

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 “oil and gas environmental services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many oil and gas environmental services are there based in the United States?

RevenueBase identified 5,660 company matches for oil and gas environmental services associated with the United States as of November 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?

Clean Harbors tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most oil and gas environmental services?

Houston leads with 503 company records, followed by Midland (163) and Denver (78).

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 64,273 professional contacts with verified work emails tracked across these 5,660 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 November 4, 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 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.